Navigating car troubles can be frustrating, especially when your Jeep Cherokee’s check engine light illuminates. Fortunately, modern vehicles like the Jeep Cherokee are equipped with an On-Board Diagnostics system, specifically OBD2, which helps pinpoint potential issues. This system communicates through codes, often referred to as OBD2 codes or trouble codes. Understanding these codes is the first step to diagnosing and resolving problems, potentially saving you time and money on unnecessary repairs.
This comprehensive guide is designed to help Jeep Cherokee owners understand and interpret OBD2 codes. We’ve compiled an extensive list of codes specific to various Jeep Cherokee models, from older carbureted engines to the more recent fuel-injected versions. Whether you’re a seasoned DIY enthusiast or just starting to learn about car maintenance, this guide will serve as a valuable resource in deciphering what your Jeep is trying to tell you. Let’s dive into the world of Jeep Cherokee Obd2 Codes and empower you to take control of your vehicle’s health.
Understanding OBD Systems in Your Jeep Cherokee
Before we delve into the specific codes, it’s helpful to understand the evolution of diagnostic systems in Jeep Cherokees. Older models utilized simpler systems, while newer versions adopted the standardized OBD2 system. This standardization means that regardless of the manufacturer, OBD2 codes follow a similar format and address common automotive systems.
For Jeep Cherokees, the diagnostic codes can be broadly categorized based on the engine type and model year:
- Carbureted Engines: These older systems used a simpler Engine Control Module (ECM) and had a unique set of codes, often displayed as two-digit numbers.
- Fuel Injected Engines (Pre-1991 & 1991-1995): As fuel injection became more common, the diagnostic systems evolved. These eras feature codes that are more detailed than carbureted systems but pre-date the standardized OBD2 P-codes.
- 1996 and Later Models (OBD2 Standard): From 1996 onwards, Jeep Cherokees, like most vehicles, adopted the OBD2 standard. This system uses five-digit alphanumeric codes, starting with a letter (P, C, B, or U), followed by four numbers. “P” codes specifically relate to powertrain issues, which are the most common engine and transmission-related problems.
Understanding which system applies to your Jeep Cherokee based on its year and engine type is crucial for correctly interpreting the diagnostic codes.
Carbureted Engine OBD Codes for Jeep Cherokee
These codes apply to older Jeep Cherokees equipped with carbureted engines. These are typically two-digit codes.
- CODE 12: No distributor reference pulses to the ECM. This code indicates an issue with the signal from the distributor, which is crucial for ignition timing. It’s normal when the ignition is ON but the engine is not running.
- CODE 13: Oxygen sensor circuit. This code suggests a problem with the oxygen sensor circuit. The system needs to run for up to 5 minutes at part throttle under load to set this code.
- CODE 14: Shorted coolant sensor circuit. Indicates a short circuit in the coolant temperature sensor. The engine needs to run for up to 5 minutes to register this code.
- CODE 15: Open coolant sensor circuit. Signals an open circuit in the coolant temperature sensor system. Similar to Code 14, it requires up to 5 minutes of engine operation to set.
- CODE 21: Throttle position sensor circuit. This code points to a problem in the throttle position sensor (TPS) circuit. The engine must idle for at least 25 seconds for this code to be triggered.
- CODE 23: Mixture control solenoid circuit is shorted or open. Indicates a fault in the mixture control solenoid circuit, which regulates fuel mixture in carbureted engines.
- CODE 34: Vacuum sensor circuit. This code suggests an issue with the vacuum sensor circuit. The engine needs to idle for up to 5 minutes for this code to set.
- CODE 41: No distributor reference pulses to the ECM at the specified engine manifold vacuum. Similar to Code 12, but specifically under manifold vacuum conditions. This code is stored in memory.
- CODE 42: Electronic Spark Timing (EST) bypass circuit or EST circuit has short circuit to ground or an open circuit. Indicates a problem with the electronic spark timing system, which controls ignition timing electronically.
- CODE 44: Lean exhaust indication. The system detects a lean exhaust condition, meaning too much oxygen in the exhaust. Requires 5 minutes of closed-loop operation at part throttle.
- CODE 44 & 45: If both codes appear, it strongly indicates a problem within the oxygen sensor circuit itself.
- CODE 45: Rich exhaust indication. The system detects a rich exhaust condition, meaning too much fuel in the exhaust. Similar conditions to Code 44 are needed to set this code.
- CODE 51: Faulty calibration unit (PROM) or installation. Indicates a problem with the Programmable Read-Only Memory (PROM) unit, which stores engine calibration data. It takes up to 30 seconds to set this code.
- CODE 54: Mixture Control (MC) solenoid circuit is shorted or the ECM is faulty. Similar to Code 23, but also suggests the ECM itself might be faulty.
- CODE 55: Voltage reference has short circuit to ground (terminal 21), faulty oxygen sensor, or faulty ECM. This code is a more general fault, pointing to issues with voltage reference, oxygen sensor, or the ECM.
Fuel Injected Engine OBD Codes (Except 1991 and Later Models) for Jeep Cherokee
These codes are for fuel-injected Jeep Cherokees, excluding 1991 and later models. These are typically four-digit codes starting with “10”.
- Code 1000: Ignition line low.
- Code 1001: Ignition line high.
- Code 1002: Oxygen heater line.
- Code 1004: Battery voltage low.
- Code 1005: Sensor ground line out of limits.
- Code 1010: Diagnostic enable line low.
- Code 1011: Diagnostic enable line high.
- Code 1012: MAP line low.
- Code 1013: MAP line high.
- Code 1014: Fuel pump line low.
- Code 1015: Fuel pump line high.
- Code 1016: Charge air temperature sensor low.
- Code 1017: Charge air temperature sensor high.
- Code 1018: No serial data from the ECU.
- Code 1021: Engine failed to start due to mechanical, fuel, or ignition problem. This is a general starting problem code, indicating issues in various systems.
- Code 1022: Start line low.
- Code 1024: ECU does not see start signal.
- Code 1025: Wide open throttle circuit low.
- Code 1027: ECU sees wide open throttle.
- Code 1028: ECU does not see wide open throttle.
- Code 1031: ECU sees closed throttle.
- Code 1032: ECU does not see closed throttle.
- Code 1033: Idle speed increase line low.
- Code 1034: Idle speed increase line high.
- Code 1035: Idle speed decrease line low.
- Code 1036: Idle speed decrease line high.
- Code 1037: Throttle position sensor reads low.
- Code 1038: Park/Neutral line high.
- Code 1040: Latched B+ line low.
- Code 1041: Latched B+ line high.
- Code 1042: No Latched B+ 1/2 volt drop.
- Code 1047: Wrong ECU. Indicates the Engine Control Unit (ECU) is not the correct one for the vehicle.
- Code 1048: Manual vehicle equipped with automatic ECU.
- Code 1049: Automatic vehicle equipped with manual ECU.
- Code 1050: Idle RPM’s less than 500.
- Code 1051: Idle RPM’s greater than 2000.
- Code 1052: MAP sensor out of limits.
- Code 1053: Change in MAP reading out of limits.
- Code 1054: Coolant temperature sensor line low.
- Code 1055: Coolant temperature sensor line high.
- Code 1056: Inactive coolant temperature sensor.
- Code 1057: Knock circuit shorted.
- Code 1058: Knock value out of limits.
- Code 1059: A/C request line low.
- Code 1060: A/C request line high.
- Code 1061: A/C select line low.
- Code 1062: A/C select line high.
- Code 1063: A/C clutch line low.
- Code 1064: A/C clutch line high.
- Code 1065: Oxygen reads rich.
- Code 1066: Oxygen reads lean.
- Code 1067: Latch relay line low.
- Code 1068: Latch relay line high.
- Code 1070: A/C cutout line low.
- Code 1071: A/C cutout line high.
- Code 1073: ECU does not see speed sensor signal.
- Code 1200: ECU defective. Indicates a fault within the Engine Control Unit (ECU) itself.
- Code 1202: Injector shorted to ground.
- Code 1209: Injector open.
- Code 1218: No voltage at ECU from power latch relay.
- Code 1220: No voltage at ECU from EGR solenoid.
- Code 1221: No injector voltage.
- Code 1222: MAP not grounded.
- Code 1223: No ECU tests run.
1991-95 Jeep Cherokee OBD Codes
These codes are specific to Jeep Cherokees manufactured between 1991 and 1995. They are a mix of two-digit and some descriptive text.
- Code 88: Display used for start of test. This code is typically used to indicate the beginning of a diagnostic test sequence.
- Code 11: Camshaft signal or Ignition signal – no reference signal detected during engine cranking. Indicates a missing signal from either the camshaft or ignition system during engine cranking.
- Code 12: Memory to controller has been cleared within 50-100 engine starts. This code often appears after the vehicle’s battery has been disconnected or the computer memory has been reset.
- Code 13: MAP sensor pneumatic signal – no variation in MAP sensor signal is detected or no difference is recognized between the engine MAP reading and the stored barometric pressure reading. Signals a problem with the Manifold Absolute Pressure (MAP) sensor readings.
- Code 14: MAP voltage too high or too low. Indicates the MAP sensor voltage is outside of the acceptable range.
- Code 15: Vehicle speed sensor signal – no distance sensor signal detected during road load condition. Points to a problem with the Vehicle Speed Sensor (VSS) signal.
- Code 16: Knock sensor circuit – Open or short has been detected in the knock sensor circuit. Indicates a fault in the knock sensor circuit, which detects engine knocking or detonation.
- Code 16: Battery input sensor – battery voltage sensor input below 4 volts with engine running. (Note: Code 16 has two possible meanings). Also indicates low voltage from the battery input sensor while the engine is running.
- Code 17: Low engine temperature – engine coolant temperature remains below normal operating temperature during vehicle travel; possible thermostat problem. Suggests the engine is not reaching proper operating temperature, often related to thermostat issues.
- Code 21: Oxygen sensor signal – neither rich nor lean condition is detected from the oxygen sensor input. Indicates the oxygen sensor is not detecting changes in the air-fuel mixture.
- Code 22: Coolant voltage low – coolant temperature sensor input below the minimum acceptable voltage/Coolant voltage high – coolant temperature sensor input above the maximum acceptable voltage. (Code 22 has two possible meanings). Indicates the coolant temperature sensor voltage is out of range (either too high or too low).
- Code 23: Air Charge or Throttle Body temperature voltage HIGH/LOW – charge air temperature sensor input is above or below the acceptable voltage limits. Indicates the air charge or throttle body temperature sensor voltage is out of range.
- Code 24: Throttle Position sensor voltage high or low. Signals that the Throttle Position Sensor (TPS) voltage is outside the acceptable range.
- Code 25: Automatic Idle Speed (AIS) motor driver circuit – short or open detected in 1 or more of the AIS control circuits. Indicates a fault in the Automatic Idle Speed (AIS) motor circuit.
- Code 26: Injectors No. 1, 2, or 3 peak current not reached, high resistance in circuit. Suggests a problem with the current flow to injectors 1, 2, or 3, possibly due to high resistance.
- Code 27: Injector control circuit – bank output driver stage does not respond properly to the control signal. (Code 27 has two possible meanings). Indicates a general issue with the injector control circuit.
- Code 27: Injectors No. 1, 2, or 3 control circuit and peak current not reached. Also suggests problems with injectors 1, 2, or 3.
- Code 31: Purge solenoid circuit – open or short detected in the purge solenoid circuit. Indicates a fault in the evaporative emission (EVAP) purge solenoid circuit.
- Code 32: Exhaust Gas Recirculation (ERG) solenoid circuit – open or short detected in the EGR solenoid circuit/EGR system failure – required change in fuel/air ratio not detected during diagnostic test. (Code 32 has two possible meanings). Signals a problem with the Exhaust Gas Recirculation (EGR) system or solenoid circuit.
- Code 33: Air conditioner clutch relay circuit – open or short detected in the air conditioner clutch relay circuit. If vehicle doesn’t have air conditioning ignore this code. Indicates a fault in the air conditioning clutch relay circuit.
- Code 34: Speed control servo solenoids or MUX speed control circuit HIGH/LOW – open or short detected in the vacuum or vent solenoid circuits or speed control switch input above or below allowable voltage. Signals a problem with the speed control (cruise control) system.
- Code 35: Radiator fan control relay circuit – open or short detected in the radiator fan relay circuit. (Code 35 has two possible meanings). Indicates a fault in the radiator fan control relay circuit.
- Code 35: Idle switch shorted – switch input shorted to ground – some 1993 vehicles. Also indicates a shorted idle switch in some 1993 models.
- Code 37: Part Throttle Unlock (PTU) circuit for torque converter clutch – open or short detected in the torque converter part throttle unlock solenoid circuit. (Code 37 has multiple meanings). Indicates a problem with the torque converter clutch PTU circuit.
- Code 37: Baro Reed Solenoid – solenoid does not turn off when it should. Also indicates a problem with the Baro Reed Solenoid.
- Code 37: Shift indicator circuit (manual transaxle). Also related to the shift indicator circuit in manual transmission models.
- Code 41: Charging system circuit – output driver stage for generator field does not respond properly to the voltage regulator control signal. Indicates a fault in the charging system circuit.
- Code 42: Fuel pump or no Auto-shutdown (ASD) relay voltage sense at controller. Signals a problem with the fuel pump or Auto-Shutdown (ASD) relay.
- Code 43: Ignition control circuit – peak primary circuit current not respond properly with maximum dwell time. (Code 43 has two possible meanings). Indicates a problem with the ignition control circuit.
- Code 43: Ignition coil #1,2, or 3 primary circuits – peak primary was not achieved within the maximum allowable dwell time. Also suggests issues with ignition coils 1, 2, or 3.
- Code 44: Battery temperature voltage – problem exists in the PCM battery temperature circuit or there is an open or short in the engine coolant temperature circuit. (Code 44 has multiple meanings). Indicates a fault in the battery temperature sensor circuit or coolant temperature circuit.
- Code 44: Fused J2 circuit in not present in the logic board; used on the signal engine module controller system. Also related to a missing Fused J2 circuit in specific controller systems.
- Code 44: Overdrive solenoid circuit – open or short in overdrive solenoid circuit. Also indicates a fault in the overdrive solenoid circuit.
- Code 46: Battery voltage too high – battery voltage sense input above target charging voltage during engine operation. Signals that the battery voltage is too high.
- Code 47: Battery voltage too low – battery voltage sense input below target charging voltage. Indicates that the battery voltage is too low.
- Code 51: Air/fuel at limit – oxygen sensor signal input indicates LEAN air/fuel ratio condition during engine operation. Indicates a lean air-fuel mixture condition based on oxygen sensor readings.
- Code 52: Air/fuel at limit – oxygen sensor signal input indicates RICH air/fuel ratio condition during engine operation. Indicates a rich air-fuel mixture condition.
- Code 53: Internal controller failure – internal engine controller fault condition detected during self-test. Signals an internal fault within the engine controller (PCM/ECM).
- Code 54: Camshaft or (distributor sync.) reference circuit – No camshaft position sensor signal detected during engine rotation. Indicates a missing camshaft position sensor signal.
- Code 55: End of message. This code typically signals the end of the diagnostic code output sequence.
- Code 61: Baro read solenoid – open or short detected in the baro read solenoid circuit. Indicates a fault in the Baro Read Solenoid circuit.
- Code 62: EMR mileage not stored – unsuccessful attempt to update EMR mileage in the controller EEPROM. Related to issues storing mileage data in the controller’s memory.
- Code 63: EEPROM write denied – unsuccessful attempt to write to an EEPROM location by the controller. Indicates a problem writing data to the controller’s EEPROM memory.
- Code 64: Flex fuel sensor – Flex fuel sensor signal out of range-(new in 1993)-CNG Temperature voltage out of range-CN gas pressure out of range. (Code 64 has multiple meanings, depending on vehicle fuel type). Can indicate problems with the flex fuel sensor (if equipped) or CNG system sensors in CNG vehicles.
- Code 66: No CCD messages or no BODY CCD messages or no EATX CCD messages – messages from the CCD bus or the body CCD or the EATX CCD were not received by the PCM. Indicates communication problems on the CCD (Chrysler Collision Detection) bus network.
- Code 76: Ballast bypass relay – open or short in fuel pump relay circuit. Indicates a fault in the ballast bypass relay or fuel pump relay circuit.
- Code 77: Speed control relay – an open or short has been detected in the speed control relay. Signals a fault in the speed control relay circuit.
- Code Error: Fault code error – Unrecognized fault ID received by DRBII. Indicates an error in the diagnostic communication or an unrecognized code.
1996 and Later Jeep Cherokee OBD2 Codes (P-Codes)
For Jeep Cherokees from 1996 onwards, the codes adhere to the standardized OBD2 format, starting with “P” for Powertrain codes, followed by four numbers. These are the most common codes you’ll encounter on newer models.
- P0107: Manifold absolute pressure/barometric pressure circuit low input. Indicates low voltage reading from the MAP/BARO sensor circuit.
- P0108: Manifold absolute pressure/barometric pressure circuit high input. Indicates high voltage reading from the MAP/BARO sensor circuit.
- P0112: Intake air temperature circuit low input. Signals low voltage from the Intake Air Temperature (IAT) sensor circuit.
- P0113: Intake air temperature circuit high input. Indicates high voltage from the IAT sensor circuit.
- P0117: Engine coolant temperature circuit low input. Signals low voltage from the Engine Coolant Temperature (ECT) sensor circuit.
- P0118: Engine coolant temperature circuit high input. Indicates high voltage from the ECT sensor circuit.
- P0121: Throttle/pedal position sensor/switch A circuit range/performance problem. Indicates a range or performance issue with the Throttle Position Sensor (TPS) or pedal position sensor.
- P0122: Throttle/pedal position sensor/switch A circuit low input. Signals low voltage from the TPS or pedal position sensor circuit.
- P0123: Throttle/pedal position sensor/switch A circuit high input. Indicates high voltage from the TPS or pedal position sensor circuit.
- P0125: Insufficient coolant temperature for closed loop fuel control. Signals that the engine coolant is not warm enough for the system to enter closed-loop fuel control.
- P0129: Catalyst monitor slow O2 sensor (Bank no. 1 Sensor no. 2). Indicates a slow response from the downstream oxygen sensor (Sensor 2, Bank 1), often related to catalyst efficiency monitoring.
- P0131: Left bank and upstream O2 sensor voltage shorted to ground. Signals a short to ground in the upstream oxygen sensor (Sensor 1, Bank 1) voltage circuit.
- P0132: Left upstream O2 sensor shorted to voltage. Indicates a short to voltage in the upstream oxygen sensor (Sensor 1, Bank 1) circuit.
- P0133: Upstream O2 sensor circuit slow response (Bank no. 1 Sensor no. 1). Signals a slow response from the upstream oxygen sensor (Sensor 1, Bank 1) circuit.
- P0135: O2 sensor heater circuit malfunction (Bank no.1 Sensor no. 1). Indicates a malfunction in the heater circuit of the upstream oxygen sensor (Sensor 1, Bank 1).
- P0137: Left bank downstream or downstream and pre-catalyst O2 sensor voltage shorted to ground. Signals a short to ground in the downstream oxygen sensor (Sensor 2, Bank 1) voltage circuit.
- P0138: Left bank downstream or downstream and pre-catalyst O2 sensor shorted to voltage. Indicates a short to voltage in the downstream oxygen sensor (Sensor 2, Bank 1) circuit.
- P0141: Downstream, left bank downstream or pre-catalyst O2 sensor heater failure. Signals a failure in the heater circuit of the downstream oxygen sensor (Sensor 2, Bank 1).
- P0152: Left upstream O2 sensor slow response. Indicates a slow response from the upstream oxygen sensor (Sensor 1, Bank 1).
- P0162: Charging system voltage too low. Signals that the charging system voltage is too low.
- P0171: Right rear (or just) fuel system too lean. Indicates a lean fuel system condition, possibly on Bank 1 (right side).
- P0172: Left bank or fuel system too rich. Indicates a rich fuel system condition, possibly on Bank 2 (left side).
- P0201: Injector no. 1 control circuit. Signals a problem with the control circuit for fuel injector #1.
- P0202: Injector no. 2 control circuit. Signals a problem with the control circuit for fuel injector #2.
- P0203: Injector no. 3 control circuit. Signals a problem with the control circuit for fuel injector #3.
- P0204: Injector no. 4 control circuit. Signals a problem with the control circuit for fuel injector #4.
- P0205: Injector no. 5 control circuit. Signals a problem with the control circuit for fuel injector #5.
- P0206: Injector no. 6 control circuit. Signals a problem with the control circuit for fuel injector #6.
- P0207: Injector no. 7 control circuit. Signals a problem with the control circuit for fuel injector #7.
- P0208: Injector no. 8 control circuit. Signals a problem with the control circuit for fuel injector #8.
- P0300: Random/multiple cylinder misfire detected. Indicates misfires are occurring in multiple cylinders or randomly.
- P0301: Cylinder no. 1-Misfire detected. Signals a misfire in cylinder #1.
- P0302: Cylinder no. 2-Misfire detected. Signals a misfire in cylinder #2.
- P0303: Cylinder no. 3-Misfire detected. Signals a misfire in cylinder #3.
- P0304: Cylinder no. 4-Misfire detected. Signals a misfire in cylinder #4.
- P0305: Cylinder no. 5-Misfire detected. Signals a misfire in cylinder #5.
- P0306: Cylinder no. 6-Misfire detected. Signals a misfire in cylinder #6.
- P0307: Cylinder no. 7-Misfire detected. Signals a misfire in cylinder #7.
- P0308: Cylinder no. 8-Misfire detected. Signals a misfire in cylinder #8.
- P0320: No crank reference signal PCM. Indicates a missing crankshaft position sensor signal to the Powertrain Control Module (PCM).
- P0340: No cam signal at PCM. Indicates a missing camshaft position sensor signal to the PCM.
- P0351: Ignition coil no. 1 primary circuit. Signals a problem in the primary circuit of ignition coil #1.
- P0420: Left bank catalytic converter or just catalytic converter efficiency failure. Indicates that the catalytic converter efficiency is below the acceptable threshold.
- P0441: Evaporative purge flow monitor failure. Signals a problem with the evaporative emission (EVAP) purge flow monitoring system.
- P0442: Evaporative emission control system leak detected (small leak). Indicates a small leak in the EVAP system.
- P0443: Evap purge solenoid circuit. Signals a problem with the EVAP purge solenoid circuit.
- P0455: Evaporative emission control system leak detected (gross leak). Indicates a large leak in the EVAP system.
- P0460: Fuel level unit no change over miles. Signals that the fuel level sensor reading is not changing as expected over distance traveled.
- P0462: Fuel level sending unit voltage too low. Indicates low voltage from the fuel level sending unit circuit.
- P0463: Fuel level sending unit voltage too high. Indicates high voltage from the fuel level sending unit circuit.
- P0500: No vehicle speed sensor signal. Signals a missing Vehicle Speed Sensor (VSS) signal.
- P0505: Idle air control motor circuits. Indicates a problem with the Idle Air Control (IAC) motor circuits.
- P0600: PCM/Serial communication link malfunction. Signals a communication problem with the PCM or serial communication link.
- P0601: Internal controller failure. Indicates an internal fault within the engine controller (PCM).
- P0622: Generator field not switching properly. Signals an issue with the generator field switching, related to the charging system.
- P0645: A/C clutch relay circuit. Indicates a problem with the Air Conditioning (A/C) clutch relay circuit.
- P0711: Transmission fluid temperature sensor, no temperature rise after start. Signals that the transmission fluid temperature sensor is not showing a temperature increase after starting.
- P0712: Transmission fluid temperature sensor voltage too low. Indicates low voltage from the transmission fluid temperature sensor circuit.
- P0713: Transmission fluid temperature sensor voltage too high. Indicates high voltage from the transmission fluid temperature sensor circuit.
- P0720: Low output speed sensor RPM above 15 MPH. Signals a low output speed sensor RPM reading when the vehicle speed is above 15 MPH, indicating a potential issue with the output speed sensor.
- P0740: Torque converter clutch, no RPM drop at lockup. Indicates that the torque converter clutch is not locking up properly, as indicated by a lack of RPM drop.
- P0743: Torque converter clutch solenoid/trans relay circuits. Signals a problem with the torque converter clutch solenoid or transmission relay circuits.
- P0748: Governor pressure solenoid control/trans relay circuits. Indicates a problem with the governor pressure solenoid control or transmission relay circuits.
- P0751: Overdrive switch pressed (LO) more than 5 minutes. Signals that the overdrive switch has been pressed in the LO position for an extended period.
- P0753: Trans 3-4 shift solenoid/trans relay circuits. Indicates a problem with the 3-4 shift solenoid or transmission relay circuits.
- P0783: 3-4 shift solenoid, no RPM drop @ 3-4 shift. Signals that there’s no RPM drop during the 3-4 shift, indicating a potential issue with the 3-4 shift solenoid.
- P1195: Catalyst monitor slow O2 sensor (Bank no. 1 Sensor no. 1). Similar to P0129, indicating a slow response from the upstream oxygen sensor (Sensor 1, Bank 1) related to catalyst monitoring.
- P1197: Catalyst monitor slow O2 sensor (Bank no. 1 Sensor no. 2). Similar to P0129, indicating a slow response from the downstream oxygen sensor (Sensor 2, Bank 1) related to catalyst monitoring.
- P1281: Engine is cold too long. Signals that the engine is taking too long to reach operating temperature.
- P1282: Fuel pump relay control circuit. Indicates a problem with the fuel pump relay control circuit.
- P1294: Target idle not reached. Signals that the engine idle speed is not reaching the target idle RPM.
- P1296: No 5 volts to MAP sensor. Indicates a lack of 5-volt reference voltage to the MAP sensor.
- P1297: No change in MAP from start to run. Signals that the MAP sensor reading is not changing from engine start to running conditions.
- P1388: Auto shutdown relay control circuit. Indicates a problem with the Auto Shutdown (ASD) relay control circuit.
- P1389: No ASD relay output voltage at PCM. Signals a lack of output voltage from the ASD relay at the PCM.
- P1391: Intermittent loss of CMP or CKP. Indicates an intermittent loss of signal from either the Camshaft Position (CMP) or Crankshaft Position (CKP) sensor.
- P1398: Misfire adaptive numerator at limit or no crank sensor learn. Signals that the misfire adaptive numerator is at its limit or there’s an issue with crank sensor learning.
- P1486: EVAP leak monitor pinched hose or obstruction found. Indicates a pinched hose or obstruction in the EVAP leak monitoring system.
- P1492: Battery temp sensor voltage too high. Indicates high voltage from the battery temperature sensor circuit.
- P1493: Battery temp sensor voltage too low. Indicates low voltage from the battery temperature sensor circuit.
- P1494: Leak detection pump pressure switch or mechanical fault. Signals a problem with the leak detection pump pressure switch or a mechanical fault in the leak detection pump.
- P1495: Leak detection pump solenoid circuit. Indicates a problem with the leak detection pump solenoid circuit.
- P1594: Charging system voltage too high. Signals that the charging system voltage is too high.
- P1595: Speed control solenoid circuits. Indicates a problem with the speed control (cruise control) solenoid circuits.
- P1596: Speed control switch always high. Signals that the speed control switch is always in the high position.
- P1597: Speed control switch always low. Signals that the speed control switch is always in the low position.
- P1683: Speed control power circuit. Indicates a problem with the speed control power circuit.
- P1696: PCM failure EEPROM write denied. Signals a failure to write to the EEPROM (Electrically Erasable Programmable Read-Only Memory) in the PCM.
- P1698: PCM failure EEPROM write denied. Signals a failure to write to the EEPROM in the PCM.
- P1756: Governor pressure not equal to target @ 15-20 PSI. Indicates that the governor pressure is not matching the target pressure in the 15-20 PSI range.
- P1757: Governor pressure above 3 PSI in gear with 0 MPH. Signals that the governor pressure is above 3 PSI while in gear at 0 MPH.
- P1762: Governor pressure sensor offset volts too low or high. Indicates that the governor pressure sensor offset voltage is out of range (too low or too high).
- P1763: Governor pressure sensor volts too high. Indicates high voltage from the governor pressure sensor circuit.
- P1764: Governor pressure sensor volts too low. Indicates low voltage from the governor pressure sensor circuit.
- P1765: Trans 12 volts supply relay control circuit. Signals a problem with the transmission 12-volt supply relay control circuit.
- P1899: P/N switch stuck in park or in gear. Indicates that the Park/Neutral (P/N) switch is stuck in either park or in gear position.
Conclusion
This guide provides a comprehensive list of OBD2 codes for Jeep Cherokee vehicles, spanning from older carbureted models to the latest OBD2 compliant versions. While this list is extensive, it’s important to remember that diagnosing vehicle problems often requires more than just reading a code.
When you encounter a check engine light and retrieve an OBD2 code, use this guide as a starting point. Research the potential causes associated with your specific code and consider factors like your vehicle’s symptoms and recent maintenance. For accurate diagnosis and repair, it’s always recommended to consult a qualified mechanic. They possess the expertise and tools to properly diagnose the underlying issue and perform the necessary repairs, ensuring your Jeep Cherokee runs smoothly and reliably. This guide empowers you with knowledge, but professional assistance is key to resolving complex automotive problems.
