1998-2006 Jeep TJ Diagnostic Codes
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If you’re having a check engine light in your 1998-2006 TJ, here is a list of codes that will help you find out what the problem is. To run the check and find out what error code(s) it’s outputting do this: Turn the key ON -> OFF -> ON -> OFF -> ON within 5 seconds. It will take a bit to run some checks and output any codes into your digital odometer readout. If you have a 1997 TJ, the chart for those codes are here. |
| Code | Scan tool display | Description of display |
| P0030 (M) | 1/1 O2 Sensor Heater Relay Circuit | Problem detected in oxygen sensor heater relay circuit. |
| P0036 (M) | 1/2 O2 Sensor Heater Relay Circuit | Problem detected in oxygen sensor heater relay circuit. |
| P0106 | Barometric Pressure Out of Range | MAP sensor input voltage out of an acceptable range detected during reading of barometric pressure at key-on. |
| P0107 (M) | Map Sensor Voltage Too Low | MAP sensor input below minimum acceptable voltage. |
| P0108 (M) | Map Sensor Voltage Too High | MAP sensor input above maximum acceptable voltage. |
| P0112 (M) | Intake Air Temp Sensor Voltage Low | Intake air (charge) temperature sensor input below the minimum acceptable voltage. |
| P0113 (M) | Intake Air Temp Sensor Voltage High | Intake air (charge) temperature sensor input above the maximum acceptable voltage. |
| P0116 | No Message | A rationality error has been detected in the coolant temp sensor. |
| P0117 (M) | ECT Sensor Voltage Too Low | Engine coolant temperature sensor input below the minimum acceptable voltage. |
| P0118 (M) | ECT Sensor Voltage Too High | Engine coolant temperature sensor input above the maximum acceptable voltage. |
| P0121 (M) | TPS Voltage Does Not Agree With MAP | TPS signal does not correlate to MAP sensor signal. |
| P0121 (M) | Accelerator Position Sensor (APPS) Signal Voltage Too Low | APPS voltage input below the minimum acceptable voltage. |
| P0122 (M) | Throttle Position Sensor Voltage Low | Throttle position sensor input below the acceptable voltage range. |
| P0122 (M) | Accelerator Position Sensor (APPS) Signal Voltage Too Low | APPS voltage input below the minimum acceptable voltage. |
| P0123 (M) | Throttle Position Sensor Voltage High | Throttle position sensor input above the maximum acceptable voltage. |
| P0123 (M) | Accelerator Position Sensor (APPS) Signal Voltage Too High | APPS voltage input above the maximum acceptable voltage. |
| P0125 (M) | Closed Loop Temp Not Reached | Time to enter Closed Loop Operation (Fuel Control) is excessive. |
| P0125 (M) | Engine is Cold Too Long | Engine does not reach operating temperature. |
| P0130 (M) | 1/1 O2 Sensor Heater Circuit Malfunction | Oxygen sensor heater element malfunction. |
| P0131 (M) | 1/1 O2 Sensor Shorted To Ground | Oxygen sensor input voltage maintained below normal operating range. |
| P0132 (M) | 1/1 O2 Sensor Shorted To Voltage | Oxygen sensor input voltage maintained above normal operating range. |
| P0133 (M) | 1/1 O2 Sensor Slow Response | Oxygen sensor response slower than minimum required switching frequency. |
| P0134 (M) | 1/1 O2 Sensor Stays at Center | Neither rich or lean condition is detected from the oxygen sensor input. |
| P0135 (M) | 1/1 O2 Sensor Heater Failure | Oxygen sensor heater element malfunction. |
| P0136 (M) | 1/2 O2 Sensor Heater Circuit Malfunction | Oxygen sensor heater element malfunction. |
| P0137 (M) | 1/2 O2 Sensor Shorted To Ground | Oxygen sensor input voltage maintained below normal operating range. |
| P0138 (M) | 1/2 O2 Sensor Shorted To Voltage | Oxygen sensor input voltage maintained above normal operating range. |
| P0139 (M) | 1/2 O2 Sensor Slow Response | Oxygen sensor response slower than minimum required switching frequency. |
| P0140 (M) | 1/2 O2 Sensor Stays at Center | Neither rich or lean condition is detected from the oxygen sensor. |
| P0141 (M) | 1/2 O2 Sensor Heater Failure | Oxygen sensor heater element malfunction. |
| P0143 (M) | 1/2 O2 Sensor Shorted To Ground | Oxygen sensor input voltage maintained below normal operating range. |
| P0144 (M) | 1/2 O2 Sensor Shorted To Voltage | Oxygen sensor input voltage maintained above normal operating range. |
| P0145 (M) | 1/2 O2 Sensor Slow Response | Oxygen sensor response slower than minimum required switching frequency. |
| P0146 (M) | 1/2 O2 Sensor Stays at Center | Neither rich or lean condition is detected from the oxygen sensor. |
| P0147 (M) | 1/2 O2 Sensor Heater Failure | Oxygen sensor heater element malfunction. |
| P0151 (M) | 2/1 O2 Sensor Shorted To Ground | Oxygen sensor input voltage maintained below normal operating range. |
| P0152 (M) | 2/1 Sensor Shorted To Voltage | Oxygen sensor input voltage maintained above normal operating range. |
| P0153 (M) | 2/1 Sensor Slow Response | Oxygen sensor response slower than minimum required switching frequency. |
| P0154 (M) | 2/1 Sensor Stays at Center | Neither rich or lean condition is detected from the oxygen sensor. |
| P0155 (M) | 2/1 O2 Sensor Heater Failure | Oxygen sensor heater element malfunction. |
| P0157 (M) | 2/2 O2 Sensor Shorted To Ground | Oxygen sensor input voltage maintained below normal operating range. |
| P0158 (M) | 2/2 O2 Sensor Shorted To Voltage | Oxygen sensor input voltage maintained above normal operating range. |
| P0159 | 2/2 Sensor Slow Response | Oxygen sensor response slower than minimum required switching frequency. |
| P0160 (M) | 2/2 Sensor Stays at Center | Neither rich or lean condition is detected from the oxygen sensor. |
| P0161 (M) | 2/2 O2 Sensor Heater Failure | Oxygen sensor heater element malfunction. |
| P0168 | Decreased Engine Performance Due To High Injection Pump Fuel Temp | Fuel temperature is above the engine protection limit. Engine power will be derated. |
| P0171 (M) | 1/1 Fuel System Lean | A lean air/fuel mixture has been indicated by an abnormally rich correction factor. |
| P0172 (M) | 1/1 Fuel System Rich | A rich air/fuel mixture has been indicated by an abnormally lean correction factor. |
| P0174 (M) | 2/1 Fuel System Lean | A lean air/fuel mixture has been indicated by an abnormally rich correction factor. |
| P0175 (M) | 2/1 Fuel System Rich | A rich air/fuel mixture has been indicated by an abnormally lean correction factor. |
| P0176 | Loss of Flex Fuel Calibration Signal | No calibration voltage present from flex fuel sensor. |
| P0177 | Water In Fuel | Excess water found in fuel by water-in-fuel sensor. |
| P0178 | Flex Fuel Sensor Volts Too Low | Flex fuel sensor input below minimum acceptable voltage. |
| P0178 | Water In Fuel Sensor Voltage Too Low | Loss of water-in-fuel circuit or sensor. |
| P0179 | Flex Fuel Sensor Volts Too High | Flex fuel sensor input above maximum acceptable voltage. |
| P0181 | Fuel Injection Pump Failure | Low power, engine derated, or engine stops. |
| P0182 (M) | CNG Temp Sensor Voltage Too Low | Compressed natural gas temperature sensor voltage below acceptable voltage. |
| P0183 (M) | CNG Temp Sensor Voltage Too High | Compressed natural gas temperature sensor voltage above acceptable voltage. |
| P0201 (M) | Injector #1 Control Circuit | An open or shorted condition detected in control circuit for injector #1 or in the INJ 1 injector bank. |
| P0202 (M) | Injector #2 Control Circuit | An open or shorted condition detected in control circuit for injector #2 or in the INJ 2 injector bank. |
| P0203 (M) | Injector #3 Control Circuit | An open or shorted condition detected in control circuit for injector #3 or in the INJ 3 injector bank. |
| P0204 (M) | Injector #4 Control Circuit | Injector #4 or INJ 4 injector bank output driver stage does not respond properly to the control signal. |
| P0205 (M) | Injector #5 Control Circuit | Injector #5 output driver stage does not respond properly to the control signal. |
| P0206 (M) | Injector #6 Control Circuit | Injector #6 output driver stage does not respond properly to the control signal. |
| P0207 (M) | Injector #7 Control Circuit | Injector #7 output driver stage does not respond properly to the control signal. |
| P0208 (M) | Injector #8 Control Circuit | Injector #8 output driver stage does not respond properly to the control signal. |
| P0209 (M) | Injector #9 Control Circuit | Injector #9 output driver stage does not respond properly to the control signal. |
| P0210 (M) | Injector #10 Control Circuit | Injector #10 output driver stage does not respond properly to the control signal. |
| P0215 | Fuel Injection Pump Control Circuit | Failure in fuel pump relay control circuit |
| P0216 (M) | Fuel Injection Pump Timing Failure | High fuel supply restriction, low fuel pressure or possible wrong or incorrectly installed pump keyway. |
| P0217 | Decreased Engine Performance Due To Engine Overheat Condition | Engine overheating. ECM will derate engine performance. |
| P0219 | Crankshaft Position Sensor Overspeed Signal | Engine has exceeded rpm limits. |
| P0222 (M) | Idle Validation Signals Both Low | Problem detected with idle validation circuits within APPS. |
| P0223 (M) | Idle Validation Signals Both High (Above 5 Volts) | Problem detected with idle validation circuits within APPS. |
| P0230 | Transfer Pump (Lift Pump) Circuit Out of Range | Problem detected in fuel transfer pump circuits. |
| P0232 | Fuel Shutoff Signal Voltage Too High | Fuel shut-off signal voltage too high from ECM to fuel injection pump. |
| P0234 (M) | Turbo Boost Limit Exceeded | Problem detected in turbocharger wastegate. |
| P0236 (M) | Map Sensor Too High Too Long | Problem detected in turbocharger wastegate. |
| P0237 (M) | Map Sensor Voltage Too Low | MAP sensor voltage input below the minimum acceptable voltage. |
| P0238 (M) | Map Sensor Voltage Too High | MAP sensor voltage input above the maximum acceptable voltage. |
| P0251 (M) | Fuel Inj. Pump Mech. Failure Fuel Valve Feedback Circuit | Problem sensed with fuel circuit internal to fuel injection pump. |
| P0253 (M) | Fuel Injection Pump Fuel Valve Open Circuit | Problem sensed with fuel circuit internal to fuel injection pump. |
| P0254 | Fuel Injection Pump Fuel Valve Current Too High | Problem caused by internal fuel injection pump failure. |
| P0300 (M) | Multiple Cylinder Mis-fire | Misfire detected in multiple cylinders. |
| P0301 (M) | CYLINDER #1 MISFIRE | Misfire detected in cylinder #1. |
| P0302 (M) | CYLINDER #2 MISFIRE | Misfire detected in cylinder #2. |
| P0303 (M) | CYLINDER #3 MISFIRE | Misfire detected in cylinder #3. |
| P0304 (M) | CYLINDER #4 MISFIRE | Misfire detected in cylinder #4. |
| P0305 (M) | CYLINDER #5 MISFIRE | Misfire detected in cylinder #5. |
| P0306 (M) | CYLINDER #6 MISFIRE | Misfire detected in cylinder #6. |
| P0307 (M) | CYLINDER #7 MISFIRE | Misfire detected in cylinder #7. |
| P0308 (M) | CYLINDER #8 MISFIRE | Misfire detected in cylinder #8. |
| P0309 (M) | CYLINDER #9 MISFIRE | Misfire detected in cylinder #9. |
| P0310 (M) | CYLINDER #10 MISFIRE | Misfire detected in cylinder #10. |
| P0320 (M) | No Crank Reference Signal at PCM | No reference signal (crankshaft position sensor) detected during engine cranking. |
| P0320 (M) | No RPM Signal to PCM (Crankshaft Position Sensor Signal to JTEC) | A CKP signal has not been detected at the PCM. |
| P0325 | Knock Sensor #1 Circuit | Knock sensor (#1) signal above or below minimum acceptable threshold voltage at particular engine speed. |
| P0330 | Knock Sensor #2 Circuit | Knock sensor (#2) signal above or below minimum acceptable threshold voltage at particular engine speed. |
| P0336 (M) | Crankshaft Position (CKP) Sensor Signal | Problem with voltage signal from CKP. |
| P0340 (M) | No Cam Signal At PCM | No fuel sync. |
| P0341 (M) | Camshaft Position (CMP) Sensor Signal | Problem with voltage signal from CMP. |
| P0350 | Ignition Coil Draws Too Much Current | A coil (1-5) is drawing too much current. |
| P0351 (M) | Ignition Coil # 1 Primary Circuit | Peak primary circuit current not achieved with maximum dwell time. |
| P0352 (M) | Ignition Coil # 2 Primary Circuit | Peak primary circuit current not achieved with maximum dwell time. |
| P0353 (M) | Ignition Coil # 3 Primary Circuit | Peak primary circuit current not achieved with maximum dwell time. |
| P0354 (M) | Ignition Coil # 4 Primary Circuit | Peak primary circuit current not achieved with maximum dwell time (High Impedence). |
| P0355 (M) | Ignition Coil # 5 Primary Circuit | Peak primary circuit current not achieved with maximum dwell time (High Impedence). |
| P0356 (M) | Ignition Coil # 6 Primary Circuit | Peak primary circuit current not achieved with maximum dwell time (high impedence). |
| P0357 (M) | Ignition Coil # 7 Primary Circuit | Peak primary circuit current not achieved with maximum dwell time (high impedence). |
| P0358 (M) | Ignition Coil # 8 Primary Circuit | Peak primary circuit current not achieved with maximum dwell time (high impedence). |
| P0370 | Fuel Injection Pump Speed/Position Sensor Sig Lost | Problem caused by internal fuel injection pump failure. |
| P0380 (M) | Intake Air Heater Relay #1 Control Circuit | Problem detected in #1 air heater solenoid/relay circuit (not heater element) |
| P0381 (M) | Wait To Start Lamp Inoperative | Problem detected in wait-to-start bulb circuit. |
| P0382 (M) | Intake Air Heater Relay #2 Control Circuit | Problem detected in #2 air heater solenoid/relay circuit (not heater element) |
| P0387 | Crankshaft Position Sensor Supply Voltage Too Low | CKP sensor voltage input below the minimum acceptable voltage. |
| P0388 | Crankshaft Position Sensor Supply Voltage Too High | CKP sensor voltage input above the maximum acceptable voltage. |
| P0401 | EGR System Failure | Required change in air/fuel ration not detected during diagnostic test. |
| P0403 | EGR Solenoid Circuit | An open or shorted condition detected in the EGR solenoid control circuit. |
| P0404 | EGR Position Sensor Rationality | EGR position sensor signal does not correlate to EGR duty cycle. |
| P0405 | EGR Position Sensor Volts Too Low | EGR position sensor input below the acceptable voltage range. |
| P0406 | EGR Position Sensor Volts Too High | EGR position sensor input above the acceptable voltage range. |
| P0412 | Secondary Air Solenoid Circuit | An open or shorted condition detected in the secondary air (air switching/aspirator) solenoid control circuit. |
| P0420 (M) | 1/1 Catalytic Converter Efficiency | Catalyst 1/1 efficiency below required level. |
| P0432 (M) | 1/2 Catalytic Converter Efficiency | Catalyst 2/1 efficiency below required level. |
| P0441 (M) | Evap Purge Flow Monitor | Insufficient or excessive vapor flow detected during evaporative emission system operation. |
| P0442 (M) | Evap Leak Monitor Medium Leak Detected | A small leak has been detected in the evaporative system. |
| P0443 (M) | Evap Purge Solenoid Circuit | An open or shorted condition detected in the EVAP purge solenoid control circuit. |
| P0455 (M) | Evap Leak Monitor Large Leak Detected | A large leak has been detected in the evaporative system. |
| P0456 (M) | Evap Leak Monitor Small Leak Detected | Leak has been detected in the evaporative system. |
| P0460 | Fuel Level Unit No Change Over Miles | During low fuel. |
| P0460 | Fuel Level Unit No Change Over Miles | Fuel level sending unit voltage does not change for more than 40 miles. |
| P0462 | Fuel Level Sending Unit Volts Too Low | Fuel level sensor input below acceptable voltage. |
| P0462 (M) | Fuel Level Sending Unit Volts Too Low | Open circuit between PCM and fuel gauge sending unit. |
| P0463 | Fuel Level Sending Unit Volts Too High | Fuel level sensor input above acceptable voltage. |
| P0463 (M) | Fuel Level Sending Unit Volts Too High | Circuit shorted to voltage between PCM and fuel gauge sending unit. |
| P0500 (M) | No Vehicle Speed Sensor Signal | No vehicle speed sensor signal detected during road load conditions. |
| P0500 (M) | No Vehicle Speed Sensor Signal | A vehicle speed signal was not detected. |
| P0505 (M) | Idle Air Control Motor Circuits | SBEC II |
| P0522 | Oil Pressure Voltage Too Low | Oil pressure sending unit (sensor) voltage input below the minimum acceptable voltage. |
| P0523 | Oil Pressure Voltage Too High | Oil pressure sending unit (sensor) voltage input above the maximum acceptable voltage. |
| P0524 | Oil Pressure Too Low | Engine oil pressure is low. Engine power derated. |
| P0545 | A/C Clutch Relay Circuit | Problem detected in air conditioning clutch relay control circuit. |
| P0551 | Power Steering Switch Failure | Incorrect input state detected for the power steering switch circuit. PL: High pressure seen at high speed. |
| P0562 | Charging System Voltage Too Low | Supply voltage sensed at ECM too low. |
| P0563 | Charging System Voltage Too High | Supply voltage sensed at ECM too high. |
| P0600 | PCM Failure SPI Communications | No communication detected between co-processors in the control module. |
| P0601 (M) | Internal Controller Failure | Internal control module fault condition (check sum) detected. |
| P0602 (M) | ECM Fueling Calibration Error | ECM Internal fault condition detected. |
| P0604 | RAM Check Failure | Transmission control module RAM self test fault detected. -Aisin transmission |
| P0605 | ROM Check Failure | Transmission control module ROM self test fault detected. -Aisin transmission |
| P0606 (M) | ECM Failure | ECM Internal fault condition detected. |
| P0615 | Starter Relay Control Circuit | An open or shorted condition detected in the starter relay control circuit. |
| P0622 (G) | Generator Field Not Switching Properly | An open or shorted condition detected in the generator field control circuit. |
| P0645 | A/C Clutch Relay Circuit | An open or shorted condition detected in the A/C clutch relay control circuit. |
| P0700 | EATX Controller DTC Present | This SBEC III or JTEC DTC indicates that the EATX or Asin controller has an active fault and has illuminated the MIL via a CCD (EATX) or SCI (Aisin) message. The specific fault must be acquired from the EATX via CCD or from the Aisin via ISO-9141. |
| P0703 | Brake Switch Stuck Pressed or Released | Incorrect input state detected in the brake switch circuit. (Changed from P1595) |
| P0711 (M) | Trans Temp Sensor, No Temp Rise After Start | Relationship between the transmission temperature and overdrive operation and/or TCC operation indicates a failure of the Transmission Temperature Sensor. OBD II Rationality. Was MIL code 37. |
| P0712 | Trans Temp Sensor Voltage Too Low | Transmission fluid temperature sensor input below acceptable voltage. Was MIL code 37. |
| P0712 (M) | Trans Temp Sensor Voltage Too Low | Voltage less than 1.55 Volts (4-speed auto. trans. only) |
| P0713 | Trans Temp Sensor Voltage Too High | Transmission fluid temperature sensor input above acceptable voltage. Was MIL code 37. |
| P0713 (M) | Trans Temp Sensor Voltage Too High | Voltage greater than 3.76 volts (4-speed auto. trans. only). |
| P0720 (M) | Low Output SPD Sensor RPM, Above 15 mph | The relationship between the Output Shaft Speed Sensor and vehicle speed is not within acceptable limits. |
| P0720 (M) | Low Output Spd Sensor RPM Above 15 mph | Output shaft speed is less than 60 rpm with vehicle speed above 15 mph (4-speed auto. trans. only). |
| P0740 (M) | Torq Con Clu, No RPM Drop at Lockup | Relationship between engine and vehicle speeds indicated failure of torque convertor clutch lock-up system (TCC/PTU solenoid) |
| P0743 (M) | Torque Converter Clutch Solenoid/ Trans Relay Circuits | An open or shorted condition detected in the torque convertor clutch (part throttle unlock) solenoid control circuit. Shift solenoid C electrical fault – Asin transmission |
| P0743 (M) | Torque Converter Clutch Solenoid/ Trans Relay Circuits | An open or shorted condition detected in the torque convertor part throttle unlock solenoid control circuit (3 or 4-speed auto. trans. only). |
| P0748 (M) | Governor Pressure Sol Control/Trans Relay Circuits | An open or shorted condition detected in the Governor Pressure Solenoid circuit or Trans Relay Circuit in JTEC RE transmissions. |
| P0748 (M) | Governor Pressure Sol Control/Trans Relay Circuits | An open or shorted condition detected in the governor pressure solenoid or relay circuits (4-speed auto. trans. only). |
| P0751 (M) | O/D Switch Pressed (Lo) More Than 5 Minutes | Overdrive override switch input is in a prolonged depressed state. |
| P0751 (M) | O/D Switch Pressed (LO) More Than 5 Minutes | Overdrive Off switch input too low for more than 5 minutes (4-speed auto. trans. only). |
| P0753 (M) | Trans 3-4 Shift Sol/Trans Relay Circuits | An open or shorted condition detected in the overdrive solenoid control circuit or Trans Relay Circuit in JTEC RE transmissions. Was MIL code 45. |
| P0753 (M) | Trans 3-4 Shift Sol/Trans Relay Circuits | An open or shorted condition detected in the transmission 2-4 shift solenoid circuit (4-speed auto. trans. only). |
| P0756 | AW4 Shift Sol B (2-3) Functional Failure | Shift solenoid B (2-3) functional fault – Asin transmission |
| P0783 (M) | 3-4 Shift Sol, No RPM Drop at Lockup | The overdrive solenoid is unable to engage the gear change from 3rd gear to the overdrive gear. |
| P0801 | Reverse Gear Lockout circuit Open or Short | An open or shorted condition detected in the transmission reverse gear lock-out solenoid control circuit. |
| P0830 | Clutch Depressed Switch Circuit | Problem detected in the clutch switch circuit. |
| P0833 | Clutch Released Switch Circuit | Problem detected in the clutch switch circuit. |
| P1110 | Decrease Engine Performance Due To High Intake Air Temperature | Intake manifold air temperature is above the engine protection limit. Engine power will be derated. |
| P1180 | Decreased Engine Performance Due To High Injection Pump Fuel Temp | Fuel temperature is above the engine protection limit. Engine power will be derated. |
| P1195 (M) | 1/1 O2 Sensor Slow During Catalyst Monitor | A slow switching oxygen sensor has been detected in bank 1/1 during catalyst monitor test. (Also see SCI DTC $66) (was P0133) |
| P1196 (M) | 2/1 O2 Sensor Slow During Catalyst Monitor | A slow switching oxygen sensor has been detected in bank 2/1 during catalyst monitor test. (Also see SCI DTC $7A) (was P0153) |
| P1197 | 1/2 O2 Sensor Slow During Catalyst Monitor | A slow switching oxygen sensor has been detected in bank 1/2 during catalyst monitor test. (Also see SCI DTC $68) (was P0139) |
| P1198 | Radiator Temperature Sensor Volts Too High | Radiator coolant temperature sensor input above the maximum acceptable voltage. |
| P1199 | Radiator Temperature Sensor Volts Too Low | Radiator coolant temperature sensor input below the minimum acceptable voltage. |
| P1281 | Engine is Cold Too Long | Engine coolant temperature remains below normal operating temperatures during vehicle travel (Thermostat). |
| P1282 | Fuel Pump Relay Control Circuit | An open or shorted condition detected in the fuel pump relay control circuit. |
| P1283 | Idle Select Signal Invalid | ECM or fuel injection pump module internal fault condition detected. |
| P1284 (M) | Fuel Injection Pump Battery Voltage Out-Of-Range | Fuel injection pump module internal fault condition detected. Engine power will be derated. |
| P1285 (M) | Fuel Injection Pump Controller Always On | Fuel injection pump module relay circuit failure detected. Engine power will be derated. |
| P1286 | Accelerator Position Sensor (APPS) Supply Voltage High | High voltage detected at APPS. |
| P1287 | Fuel Injection Pump Controller Supply Voltage Low | ECM or fuel injection pump module internal fault condition detected. Engine power will be derated. |
| P1288 | Intake Manifold Short Runner Solenoid Circuit | An open or shorted condition detected in the short runner tuning valve circuit. |
| P1289 | Manifold Tune Valve Solenoid Circuit | An open or shorted condition detected in the manifold tuning valve solenoid control circuit. |
| P1290 | CNG Fuel System Pressure Too High | Compressed natural gas system pressure above normal operating range. |
| P1291 | No Temp Rise Seen From Intake Heaters | Energizing Heated Air Intake does not change intake air temperature sensor an acceptable amount. |
| P1291 (M) | No Temperature Rise Seen From Intake Air Heaters | Problem detected in intake manifold air heating system. |
| P1292 | CNG Pressure Sensor Voltage Too High | Compressed natural gas pressure sensor reading above acceptable voltage. |
| P1293 | CNG Pressure Sensor Voltage Too Low | Compressed natural gas pressure sensor reading below acceptable voltage. |
| P1294 (M) | Target Idle Not Reached | Target RPM not achieved during drive idle condition. Possible vacuum leak or IAC (AIS) lost steps. |
| P1295 (M) | No 5 Volts to TP Sensor | Loss of a 5 volt feed to the Throttle Position Sensor has been detected. |
| P1295 (M) | Accelerator Position Sensor (APPS) Supply Voltage Too Low | APPS supply voltage input below the minimum acceptable voltage. |
| P1296 | No 5 Volts to MAP Sensor | Loss of a 5 volt feed to the MAP Sensor has been detected. |
| P1297 (M) | No Change in MAP From Start To Run | No difference is recognized between the MAP reading at engine idle and the stored barometric pressure reading. |
| P1298 | Lean Operation at Wide Open Throttle | A prolonged lean condition is detected during Wide Open Throttle. |
| P1299 | Vacuum Leak Found (IAC Fully Seated) | MAP Sensor signal does not correlate to Throttle Position Sensor signal. Possible Vacuum Leak. |
| P1388 | Auto Shutdown Relay Control Circuit | An open or shorted condition detected in the ASD or CNG shutoff relay control ckt. |
| P1388 | Auto Shutdown Relay Control Circuit | An open or shorted condition detected in the auto shutdown (ASD) relay circuit. |
| P1389 | No ASD Relay Output Voltage At PCM | No Z1 or Z2 voltage sensed when the auto shutdown relay is energized. |
| P1389 (M) | No ASD Relay Output Voltage At PCM | An open condition detected in the ASD relay output circuit. |
| P1390 | Timing Belt Skipped 1 Tooth or More | Relationship between Cam and Crank signals not correct. |
| P1391 (M) | Intermittent Loss of CMP or CKP | Loss of the Cam Position Sensor or Crank Position sensor has occurred. For PL 2.0L |
| P1398 (M) | Mis-Fire Adaptive Numerator at Limit | PCM is unable to learn the Crank Sensor’s signal in preparation for Misfire Diagnostics. Probable defective Crank Sensor. |
| P1399 | Wait To Start Lamp Circuit | An opn or shorted condition detected in the Wait to Start Lamp circuit. |
| P1403 | No 5V to EGR Sensor | Loss of 5V feed to the EGR position sensor |
| P1475 | Aux 5 Volt Supply Voltage High | Sensor supply voltage for ECM sensors is too high. (See also P01475) |
| P01475 | Aux 5 Volt Supply Voltage High | Sensor supply voltage for ECM sensors is too high. (See also P1475) |
| P1476 | Too Little Secondary Air | Insufficient flow of secondary air injection detected during aspirator test (was P0411) |
| P1477 | Too Much Secondary Air | Excessive flow of secondary air injection detected during aspirator test (was P0411) |
| P1478 | Battery Temp Sensor Volts Out of Limit | Internal temperature sensor input voltage out of an acceptable range. |
| P1479 | Transmission Fan Relay Circuit | An open or shorted condition detected in the transmission fan relay circuit. |
| P1480 | PCV Solenoid Circuit | An open or shorted condition detected in the PCV solenoid circuit. |
| P1481 | EATX RPM Pulse Perf | EATX RPM pulse generator signal for misfire detection does not correlate with expected value. |
| P1482 | Catalyst Temperature Sensor Circuit Shorted Low | Catalyst temperature sensor circuit shorted low. |
| P1483 | Catalyst Temperature Sensor Circuit Shorted High | Catalyst temperature sensor circuit shorted high. |
| P1484 | Catalytic Converter Overheat Detected | A catalyst overheat condition has been detected by the catalyst temperature sensor. |
| P1485 | Air Injection Solenoid Circuit | An open or shorted condition detected in the air assist solenoid circuit. |
| P1486 | Evap Leak Monitor Pinched Hose Found | LDP has detected a pinched hose in the evaporative hose system. |
| P1487 | Hi Speed Rad Fan CtrL Relay Circuit | An open or shorted condition detected in the control circuit of the #2 high speed radiator fan control relay. |
| P1488 | Auxiliary 5 Volt Supply Output Too Low | Auxiliary 5 volt sensor feed is sensed to be below an acceptable limit. |
| P1489 | High Speed Fan CtrL Relay Circuit | An open or shorted condition detected in the control circuit of the high speed radiator fan control relay. |
| P1490 | Low Speed Fan CtrL Relay Circuit | An open or shorted condition detected in the control circuit of the low speed radiator fan control relay. |
| P1491 | Rad Fan Control Relay Circuit | An open or shorted condition detected in the radiator fan control relay control circuit. This includes PWM solid state relays. |
| P1492 | Ambient/Batt Temp Sensor Volts Too High | External temperature sensor input above acceptable voltage. |
| P1492 (M) | Ambient/Batt Temp Sensor Volts Too High | Battery temperature sensor input voltage above an acceptable range. |
| P1493 (M) | Ambient/Batt Temp Sensor Volts Too Low | External temperature sensor input below acceptable voltage. |
| P1493 (M) | Ambient/Batt Temp Sensor Volts Too Low | Battery temperature sensor input voltage below an acceptable range. |
| P1494 (M) | Leak Detection Pump Sw or Mechanical Fault | Incorrect input state detected for the Leak Detection Pump (LDP) pressure switch. |
| P1495 | Leak Detection Pump Solenoid Circuit | An open or shorted condition detected in the Leak Detection Pump (LDP) solenoid circuit. |
| P1496 | 5 Volt Supply, Output Too Low | 5 volt sensor feed is sensed to be below an acceptable limit. (less thean 4V for 4 seconds) |
| P1498 | High Speed Rad Fan Ground CtrL Relay Circuit | An open or shorted condition detected in the control circuit of the #3 high speed radiator fan control relay. |
| P1499 | Hydraulic cooling fan solenoid circuit | An open or shorted condition detected in the cooling fan control solenoid circuit. |
| P1594 (G) | Charging System Voltage Too High | Battery voltage sense input above target charging voltage during engine operation. |
| P1594 | Charging System Voltage Too High | Battery voltage sense input above target charging voltage during engine operation. |
| P1595 | Speed Control Solenoid Circuits | An open or shorted condition detected in either of the speed control vacuum or vent solenoid control circuits. |
| P1595 | Speed Control Solenoid Circuits | An open or shorted condition detected in the speed control vacuum or vent solenoid control circuits. |
| P1596 | Speed Control Switch Always High | Speed control switch input above maximum acceptable voltage. |
| P1597 | Speed Control Switch Always Low | Speed control switch input below minimum acceptable voltage. |
| P1597 | Speed Control Switch Always Low | Speed control switch input below minimum acceptable voltage. |
| P1598 | A/C Pressure Sensor Volts Too High | A/C pressure sensor input above maximum acceptable voltage. |
| P1598 | A/C Sensor Input High | Problem detected in air conditioning electrical circuit. |
| P1599 | A/C Pressure Sensor Volts Too Low | A/C pressure sensor input below minimum acceptable voltage. |
| P1599 | A/C Sensor Input Low | Problem detected in air conditioning electrical circuit. |
| P1680 | Clutch Released Switch Circuit | Problem detected in clutch switch electrical circuit. |
| P1681 | No I/P Cluster CCD/J1850 Messages Received | No CCD/J1850 messages received from the cluster control module. |
| P1682 (G) | Charging System Voltage Too Low | Battery voltage sense input below target charging voltage during engine operation and no significant change in voltage detected during active test of generator output circuit. |
| P1682 | Charging System Voltage Too Low | Charging system output voltage low. |
| P1683 | SPD CtrL PWR Relay; or S/C 12V Driver Circuit | An open or shorted condition detected in the speed control servo power control circuit. |
| P1683 | SPD CtrL PWR Relay; or S/C 12V Driver Circuit | An open or shorted condition detected in the speed control servo power control circuit. |
| P1684 | Batt Loss in 50 Starts | The battery has been disconnected within the last 50 starts. |
| P1685 | SKIM Invalid Key | The engine controller has received an invalid key from the SKIM. |
| P1686 | No SKIM BUS Messages Received | No CCD/J1850 messages received from the Smart Key Immobilizer Module (SKIM) |
| P1687 | No MIC BUS Message | No CCD/J1850 messages received from the Mechanical Instrument Cluster (MIC) module. |
| P1688 (M) | Internal Fuel Injection Pump Controller Failure | Internal problem within the fuel injection pump. Low power, engine derated, or engine stops. |
| P1689 (M) | No Communication Between ECM and Injection Pump Module | Data link circuit failure between ECM and fuel injection pump. Low power, engine derated, or engine stops. |
| P1690 (M) | Fuel Injection Pump CKP Sensor Does Not Agree With ECM CKP Sensor | Problem in fuel sync signal. Possible injection pump timing problem. Low power, engine derated, or engine stops. |
| P1691 | Fuel Injection Pump Controller Calibration Error | Internal fuel injection pump failure. Low power, engine derated, or engine stops. |
| P1692 | DTC Set In ECM | A "Companion DTC" was set in both the ECM and PCM. |
| P1693 (M) | DTC Detected In Companion Module | A fault has been generated in the companion engine control module. |
| P1693 (M) | DTC Detected In PCM/ECM or DTC Detected in ECM | A "Companion DTC" was set in both the ECM and PCM. |
| P1694 | Fault In Companion Module | No CCD/J1850 messages received from the powertrain control module-Aisin transmission. |
| P1694 (M) | No CCD Messages Received From ECM | Bus communication failure to PCM. |
| P1695 | No CCD/J1850 Message From Body Control Module | No CCD/J1850 messages received from the body control module. |
| P1696 | PCM Failure EEPROM Write Denied | Unsuccessful attempt to write to an EEPROM location by the control module. |
| P1697 | PCM Failure SRI Mile Not Stored | Unsuccessful attempt to update Service Reminder Indicator (SRI or EMR) mileage in the control module EEPROM. |
| P1698 | No CCD/J1850 Message From TCM | No CCD/J1850 messages received from the electronic transmission control module (EATX) or the Aisin transmission controller. |
| P1698 | No CCD Messages Received From PCM | Bus communication failure to PCM. A "Companion DTC" was set in both the ECM and PCM. |
| P1719 | Skip Shift Solenoid Circuit | AN open or shorted condition detected in the transmission 2-3 gear lock-out solenoid control circuit. |
| P1740 | TCC or OD Sol Perf | A rationality error has been detected in either the TCC solenoid or overdrive solenoid systems. |
| P1740 (M) | TCC OR O/D Solenoid Performance | Problem detected in transmission convertor clutch and/or overdrive circuits (diesel engine with 4-speed auto. trans. only). |
| P1756 (M) | GOV Press Not Equal to Target @ 15-20 PSI | The requested pressure and the actual pressure are not within a tolerance band for the Governor Control System which is used to regulate governor pressure to control shifts for 1st, 2nd, and 3rd gear. (Mid Pressure Malfunction) |
| P1756 (M) | GOV Press Not Equal to Target @ 15-20 PSI | Governor sensor input not between 10 and 25 psi when requested (4-speed auto trans only). |
| P1757 | GOV Press Not Equal to Target @ 15-20 PSI | The requested pressure and the actual pressure are not within a tolerance band for the Governor Control System which is used to regulate governor pressure to control shifts for 1st, 2nd, and 3rd gear. (Zero Pressure Malfunction) |
| P1757 (M) | Governor Pressure Above 3 PSI in Gear With 0 MPH | Governor pressure greater than 3 psi when requested to be 0 psi (4-speed auto trans only). |
| P1762 (M) | Gov Press Sen Offset Volts Too Lo or High | The Governor Pressure Sensor input is greater than a calibration limit or is less than a calibration limit for 3 consecutive park/neutral calibrations. |
| P1762 (M) | Governor Press Sen Offset Volts Too Low or High | Sensor input greater or less than calibration for 3 consecutive Neutral/Park occurrences (4-speed auto trans only). |
| P1763 | Governor Pressure Sensor Volts Too Hi | The Governor Pressure Sensor input is above an aceeptable voltage level. |
| P1763 (M) | Governor Pressure Sensor Volts Too Hi | Voltage greater than 4.89 volts (4-speed auto trans only). |
| P1764 (M) | Governor Pressure Sensor Volts Too Low | The Governor Pressure Sensor input is below an acceptable voltage level. |
| P1764 (M) | Governor Pressure Sensor Volts Too Low | Voltage less than .10 volts (4-speed auto trans only). |
| P1765 (M) | Trans 12 Volt Supply Relay CtrL Circuit | An open or shorted condition is detected in the Transmission Relay control circuit. This relay supplies power to the TCC. |
| P1765 (M) | Trans 12 Volt Supply Relay CtrL Circuit | Current state of solenoid output port is different than expected (4-speed auto trans only). |
| P1899 (M) | P/N Switch Stuck in Park or in Gear | Incorrect input state detected for the Park/Neutral switch. |
| P1899 (M) | P/N Switch Stuck in Park or in Gear | Incorrect input state detected for the Park/Neutral switch (3 or 4-speed auto trans only). |
-Davin (Raskull)
July 24th, 2008 at 3:54 pm
this site blows me away! you’ve done a terrific job. I’ll be on it quite a bit in the next couple of months preparing….. : )
July 29th, 2008 at 1:59 pm
Excellant you have lots of good stuff on here that will help a lot when working on the TJ,
October 3rd, 2008 at 4:14 pm
All of the gauges in my 98 TJ Just failed and i have know idea what might be wrong do you know?
October 4th, 2008 at 1:20 pm
I’m not sure, but you can check the wiring harness under the dash to mak sure it’s still connected. You can also check the fuses behind your glove box. There is a fuse diagram back there too.
Other than that I would recommend taking your dash apart to have a look at the back of the cluster to visually inspect it.
Good luck!
January 3rd, 2009 at 8:01 pm
i’m getting a P0431 OBD code using the key method. It doesn’t show up in your table of codes. Any ideas what it is? I have a 2005 Wrangler Unlimited.
February 1st, 2009 at 8:57 pm
I’m not sure, maybe try a search on jeepforum.com or google.com?
February 20th, 2009 at 8:52 pm
ok i have been chasing this problem for a few years now. my jeep has a rough idle and back fires out the ex and in and always smells flooded my mechanic cant figure it out and i have replaced the cps, iacv, tps, map, pick up coil, coil, distributer, exaust, cap, rotor, plugs, wires, injectors, fuel pump, intake, front 02 sensor, and checked for vacume leaks. and i think thats it.. it keeps tripping the same codes p0300-0306, p0320, p0123, p0108..
it ran good for about 3 days after i rplaced the map and cps then it came right back.. any help or input would be greatly apprieciated.. im gonna pull whats left of my hair out now
February 21st, 2009 at 7:42 pm
Well, I’m no mechanic so I’m not sure I can help you. Have you tried putting up a thread on jeepforum.com or pirate4x4.com? Both of those forums would have someone knowledgeable enough with the I6 to help you.
March 15th, 2009 at 7:44 pm
Hey i was wondering, my engine light is on but when i did this to my 02 TJ all it said was “SoF 2.1″ and then it says “No Faults”. Can anyone tell me what this means, please email me back if you can at karenangus@sbcglobal.net
Thanks,
Evan
March 17th, 2009 at 5:20 pm
No Faults means just that. You’re not getting any error codes.. that is a good thing. :P
April 25th, 2009 at 9:59 pm
I have a 2001 jeep wrangler with 4 cyl engine and the check engine light is on. The code is P0442 and P0445. How can I check this out? I want to fix the problem myself.
April 26th, 2009 at 1:02 am
From my experience, it’s most likely the gas cap, but I have never encountered the large leak myself.
July 10th, 2009 at 6:29 pm
My daughter’s 98 TJ over heated on her way to work, when I got there with water and coolant I poured water into the radiator and it immediately leaked out of, near or around the header pipes. Is this indicative of a blown head gasket?
December 10th, 2009 at 8:12 pm
I have a 2006 unlimited. I tried the key on/off 2 times, left on for 3rd but I do not get a code, waited but never got codes. I see the engine light do its 10 blinks..
I miss something? How long does it take for the CPU to do its checks?
December 18th, 2009 at 7:36 pm
It should only take about 10-20 seconds.. if you’re having troubles getting it to work, stop by your local chrysler dealer and they can run the check for you.
December 30th, 2009 at 4:14 pm
I am getting a code P0138 1/2 O2 Sensor Shorted To Voltage Oxygen sensor input voltage maintained above normal operating range. Does anyone know the fix for that??
January 21st, 2010 at 5:57 pm
Hey Raskull. It is a fellow JF member here. I must just say, this is one great website. I saw it before, but I found it again when I was trying to find out what CEL code I had, and I couldn’t remember how to get the code. Since I didn’t have a code listed here, I will make my contribution to your site.
P0016 – Crankshaft/Cam Misalignment. What it really means is that The Crank Shaft Positioning Sensor is misaligned causing a false reading. Mine was off by 12 degrees, and my local dealership fixed it since they did recall work. This happens a lot with this work. There was a recall for some 2005 TJs with the 42rle, and the cam shaft positioning sensor usually has to be replaced.
I just figured I would stop back to say hi, thanks, and add a little bit of info to your list.
March 27th, 2010 at 1:23 pm
I would suggest you post a thread on jeepforum.com with the specific error code, and hopefully someone can help you there.
March 27th, 2010 at 1:26 pm
Awesome thanks!
July 9th, 2010 at 10:48 am
My daughter has a 1998 Jeep Wrangler with P0463 code. What do we need to do to correct this problem?
July 26th, 2010 at 3:19 pm
Thanks for the excellent site but I have 2 codes – P0456 and P0457
any idea what P0457 is?
I suspect it could be that the gas cap was not seated properly and that may be the cause of my evap leak. Love to hear from any with this experience
Thanks!
August 31st, 2010 at 7:06 pm
Can anyone help me to figure out how to fix this problem? I have a 2003 Wrangler and I’m getting codes P0118, P0455, and P0432. Thanks
September 4th, 2010 at 4:38 am
i cannot get any codes to come up on my odometer.i have a 2000 tj that jumps as if is not getting gas or air.need help …ty
September 4th, 2010 at 4:06 pm
my 2001 Cherokee has code PO432 come up – which means Bank 2 catalytic converter below threshold. Knowledgeable guy says there isn’t even a Bank 2 on this car. ?? what does it REALLY mean – - anyone know of a recall for this error. what if you keep driving it ??
September 21st, 2010 at 10:47 am
Thank you for your Excellent Website! Your Diagnostic codes are so helpful!
September 22nd, 2010 at 9:41 pm
i have a 2001 jeep wrangler 4.0 and im getting code P1391 but my jeep doesn’t act up till its been running for like 30 mins or so. i already replace the crankshaft Position Sensor and its still acting up. i erased the codes and when it started acting up again that same code pop up. could it be the camshaft sensor that is making run crazy. please any help.
Thanks
Ryan
November 23rd, 2010 at 6:16 am
I have an 2002 TJ, when I turn the key to start, it says Sof 2.1, bus 60, bus b1, bus b8, then 05-03, can anyone tell me what all that means? thanks
December 17th, 2010 at 9:32 am
i have no communication on 98 jeep grand cherokee 4.0 engine with autu trans
i took it to have it smogged and it failed for no communication
i took it to repair shop and thier scanner works…but the smog machine will not
communicate…please help
December 24th, 2010 at 6:05 pm
I’m really not sure, I don’t know a whole lot about the computers/OBD in the Jeeps. Maybe post a thread up on the forums at http://jeepforum.com
February 4th, 2011 at 6:37 am
TJGAA IT IS UR UPPER CATS I JUST REPLACED MINE AND THAT WAS THE PROBLEM
February 8th, 2011 at 2:42 pm
my 2005 jeep tj has code o602 (ecm fueling calibration error). Any ideas on neccesary repairs?
March 23rd, 2011 at 8:10 am
I have jeep cherokyee 2001 I am getting codes p 320 and p455 what does that mean?
March 24th, 2011 at 3:21 pm
I have a 2001 Jeep Wrangler 4.0, and my problem is it run and quits on me, it came up with code p 1391 with is camshaft sensor i replaced it, and it still didnt fix the problem. also i came up with three other codes which where p 0320, p 1597, and p 0463.
August 25th, 2011 at 7:59 am
P1294 (M) Target Idle Not Reached
Target RPM not achieved during drive idle condition. Possible vacuum leak or IAC (AIS) lost steps.
Listening to the jeep, I now hear a “Whistling” noise since I got the P1294 code. Does this mean I have a vacuum leak and probably NOT an IAC problem?
Thanks,
Danny O
September 28th, 2011 at 5:11 pm
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October 3rd, 2011 at 10:12 pm
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October 24th, 2011 at 8:21 pm
need help 2001 GCL 42re trans when warmed up will not shift out of 2nd gear. i changed gov soleniod, transducer, shift soleniod, and filter and gasket. We have no codes. When cold shifts great 10 minutes down the road it acts up. will not shift from 2nd to third. Is that the default or limb mode i read about?
December 3rd, 2011 at 5:50 am
Wow, amazing weblog layout! How long have you been blogging for? you make blogging look easy. The overall look of your website is fantastic, let alone the content!
January 4th, 2012 at 8:11 pm
2006 Wrangler Sport
I pulled a P0700 code & a SOF 7.1
Does anyone understand what it means?
I appreciate the feed back.