Imagine yourself stranded on the side of the road, your Jeep’s engine sputtering and refusing to budge. You pop the hood, but the culprit behind the malfunction remains elusive. That’s where Jeep’s onboard diagnostic system, OBD/OBD2, comes in – a valuable tool that can help you pinpoint the problem with a simple code.
But what do these codes mean, and how can you use them to get your Jeep running smoothly again?
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Understanding Jeep OBD/OBD2 Codes
When troubleshooting issues with your Jeep, understanding OBD/OBD2 codes is essential to identifying the root cause of the problem.
These alphanumeric codes help diagnose specific issues with your vehicle, including engine, transmission, or emissions system troubles.
Your Jeep Wrangler’s onboard diagnostic system can display Diagnostic Trouble Codes on the odometer, indicating a problem’s presence.
Codes are categorized into groups like P-codes for powertrain, B-codes for body, C-codes for chassis, and U-codes for network systems.
For instance, codes B1B78, B1B79, and B1B7A relate to passenger seat weight sensor performance and input circuits.
Familiarizing yourself with Jeep OBD/OBD2 codes enables you to pinpoint trouble areas, such as faulty sensors or circuits, and take corrective action to resolve the issue.
OBD2 Codes for Jeep Models
Diagnose issues with your Jeep more efficiently by understanding the OBD2 codes specific to your model. Jeep’s OBD2 system uses a combination of generic and manufacturer-specific codes to identify problems with your vehicle’s engine, transmission, and other systems.
For instance, code P0133 indicates an oxygen sensor circuit slow response, while a malfunctioning Right Rear Input Circuit is represented by code B1431. Other common codes include P0463 for a faulty fuel level sender, P0118 for a malfunctioning coolant temperature sensor, and P0231 for a faulty Fuel pump relay control.
Additionally, codes P0030 and P0031 relate to the Oxygen sensor heater circuit, while P0113 and P0115 relate to the air temperature sensor. By understanding these codes, you can quickly identify issues like Misfire detected in cylinder, Speed control vacuum, and more.
Troubleshooting With OBD2 Codes
Precision is key when troubleshooting with OBD2 codes, as it allows you to pinpoint the root cause of the issue and take corrective action.
When the Check Engine Light illuminates, it’s essential to retrieve the Trouble Codes using a diagnostic tool. These codes will guide you towards the faulty component, such as a malfunctioning O2 Sensor Heater Circuit or a Misfire detected.
You may need to inspect the Crankshaft Position Sensor, MAP sensor, or Air/Fuel sensor to identify the culprit. The Speed Sensor and Oxygen sensor heater are also potential suspects.
Most Common Jeep OBD-II Trouble Codes
| Code | Description |
|---|---|
| P0016 | Crankshaft/Camshaft Timing Misalignment |
| P0031 | O2 Sensor 1/1 Heater Circuit Low |
| P0032 | O2 Sensor 1/1 Heater Circuit High |
| P0037 | O2 Sensor 1/2 Heater Circuit Low |
| P0038 | O2 Sensor 1/2 Heater Circuit High |
| P0051 | O2 Sensor 2/1 Heater Circuit Low |
| P0106 | Barometric Pressure Out of Range |
| P0107 | MAP Sensor Voltage Too Low |
| P0108 | MAP Sensor Voltage Too High |
| P0112 | Intake Air Temp Sensor Voltage Low |
| P0113 | Intake Air Temp Sensor Voltage High |
| P0116 | Engine Coolant Temperature Circuit Range/Performance Problem |
| P0117 | Engine Coolant Temperature Circuit Low Input |
| P0118 | Engine Coolant Temperature Circuit High Input |
| P0122 | Throttle Position Sensor Voltage Low |
| P0123 | Throttle Position Sensor Voltage High |
| P0128 | Thermostat Rationality |
| P0131 | O2 Sensor 1/1 Circuit Low Voltage |
| P0132 | O2 Sensor 1/1 Circuit High Voltage |
| P0133 | O2 Sensor 1/1 Circuit Slow Response |
| P0134 | O2 Sensor 1/1 Circuit No Activity Detected |
| P0135 | O2 Sensor 1/1 Heater Circuit Malfunction |
| P0137 | O2 Sensor 1/2 Circuit Low Voltage |
| P0138 | O2 Sensor 1/2 Circuit High Voltage |
| P0140 | O2 Sensor 1/2 Circuit No Activity Detected |
| P0141 | O2 Sensor 1/2 Heater Circuit Malfunction |
| P0151 | O2 Sensor 2/1 Circuit Low Voltage |
| P0152 | O2 Sensor 2/1 Circuit High Voltage |
| P0153 | O2 Sensor 2/1 Circuit Slow Response |
| P0154 | O2 Sensor 2/1 Circuit No Activity Detected |
| P0155 | O2 Sensor 2/1 Heater Circuit Malfunction |
| P0171 | System Too Lean (Bank 1) |
| P0172 | System Too Rich (Bank 1) |
| P0174 | System Too Lean (Bank 2) |
| P0175 | System Too Rich (Bank 2) |
| P0300 | Random/Multiple Cylinder Misfire Detected |
| P0301 | Cylinder 1 Misfire Detected |
| P0302 | Cylinder 2 Misfire Detected |
| P0303 | Cylinder 3 Misfire Detected |
| P0304 | Cylinder 4 Misfire Detected |
| P0305 | Cylinder 5 Misfire Detected |
| P0306 | Cylinder 6 Misfire Detected |
| P0325 | Knock Sensor 1 Circuit Malfunction (Bank 1 or Single Sensor) |
| P0335 | Crankshaft Position Sensor Circuit Malfunction |
| P0340 | Camshaft Position Sensor Circuit Malfunction |
| P0351 | Ignition Coil A Primary/Secondary Circuit Malfunction |
| P0352 | Ignition Coil B Primary/Secondary Circuit Malfunction |
| P0353 | Ignition Coil C Primary/Secondary Circuit Malfunction |
| P0354 | Ignition Coil D Primary/Secondary Circuit Malfunction |
| P0355 | Ignition Coil E Primary/Secondary Circuit Malfunction |
| P0356 | Ignition Coil F Primary/Secondary Circuit Malfunction |
| P0401 | EGR System Failure |
| P0420 | Catalyst System Efficiency Below Threshold (Bank 1) |
| P0430 | Catalyst System Efficiency Below Threshold (Bank 2) |
| P0441 | Evaporative Emission Control System Incorrect Purge Flow |
| P0442 | Evaporative Emission Control System Leak Detected (Small Leak) |
| P0455 | Evaporative Emission Control System Leak Detected (Large Leak) |
| P0456 | Evaporative Emission Control System Leak Detected (Very Small Leak) |
| P0461 | Fuel Level Sensor Circuit Range/Performance |
| P0462 | Fuel Level Sensor Circuit Low Input |
| P0463 | Fuel Level Sensor Circuit High Input |
| P0480 | Cooling Fan 1 Control Circuit Malfunction |
| P0481 | Cooling Fan 2 Control Circuit Malfunction |
| P0500 | Vehicle Speed Sensor Malfunction |
| P0501 | Vehicle Speed Sensor Range/Performance |
| P0506 | Idle Speed Performance Lower Than Expected |
| P0507 | Idle Speed Performance Higher Than Expected |
| P0513 | Invalid Skim Key |
| P0522 | Engine Oil Pressure Too Low |
| P0562 | Battery Voltage Low |
| P0563 | Battery Voltage High |
| P0571 | Brake Switch 1 Performance |
| P0579 | Speed Control Switch 1 Performance |
| P0600 | PCM Failure SPI Communications |
| P0601 | PCM Internal Controller Failure |
| P0604 | RAMÂ Check Failure |
| P0605 | ROM Check Failure |
| P0615 | Starter Relay Control Circuit |
| P0622 | Generator Field Not Switching Properly |
| P0645 | A/C Clutch Relay Circuit |
| P0700 | EATX Controller DTC Present |
| P0703 | Brake Switch Sense Circuit |
| P0711 | Trans Temp Sensor, No Temp Rise After Start |
| P0712 | Trans Temp Sensor Voltage Too Low |
| P0713 | Trans Temp Sensor Voltage Too High |
| P0720 | Low Output SPD Sensor RPM, Above 15 MPH |
| P0740 | Torq Con Clu, No RPM Drop at Lockup |
| P0743 | Torque Converter Clutch Solenoid/Trans Relay Circuit Electrical |
| P0748 | Pressure Control Solenoid Electrical |
| P0751 | 1-2 Shift Solenoid Performance |
| P0753 | 1-2 Shift Solenoid Circuit Electrical |
| P0756 | 2-3 Shift Solenoid Performance |
| P0758 | 2-3 Shift Solenoid Circuit Electrical |
| P0761 | 3-4 Shift Solenoid Performance |
| P0763 | 3-4 Shift Solenoid Circuit Electrical |
| P0766 | 4-5 Shift Solenoid Performance |
| P0768 | 4-5 Shift Solenoid Circuit Electrical |
| P0888 | Relay Control Circuit Low |
| P0889 | Relay Control Circuit High |
| P1281 | Engine is Cold Too Long |
| P1282 | Fuel Pump Relay Circuit |
| P1288 | Intake Manifold Short Runner Tuning Valve Circuit |
| P1391 | Intermittent Loss of CMP or CKP |
| P1398 | Mis-Synchronization between Cam and Crank Signals |
| P1491 | Radiator Fan Control Relay Circuit |
| P1494 | Leak Detection Pump Solenoid Circuit |
| P1495 | Leak Detection Pump Solenoid Circuit |
| P1594 | Charging System Voltage Too High |
| P1595 | Speed Control Related DTCs |
| P1596 | Speed Control Related DTCs |
| P1597 | Speed Control Related DTCs |
| P1598 | Speed Control Related DTCs |
| P1599 | Speed Control Related DTCs |
| P1603 | PCM Internal Dual-Port RAM Communication Error |
| P1604 | PCM Internal Dual-Port RAMÂ Communication Error |
| P1684 | Battery Disconnected Within Last 50 Starts |
| P1685 | Skim Invalid Key |
| P1686 | No SKIM Key Detected (SKIM-to-PCM Signal Missing) |
| P1687 | No SKIM Key Detected (SKIM-to-PCM Signal Missing) |
| P1688 | Internal Fuel Injection Pump Controller Failure |
| P1689 | No Communication Between PCM and Fuel Injection Pump Module |
| P1690 | Fuel Injection Pump CKP Signal Error |
| P1691 | Fuel Injection Pump Power Circuit Problem |
| P1692 | DTC Detected in ECU or TCU |
| P1693 | DTC Detected in ECU or TCU |
| P1694 | No CCD Messages Received From ECU or TCU |
| P1695 | No CCD Messages Received From ECU or TCU |
| P1696 | PCM Failure EEPROM Write Denied |
| P1697 | PCM Failure SRI Mile Not Stored |
| P1698 | No CCD Messages Received From ECU or TCU |
| P1719 | Skip Shift Solenoid Circuit |
| P1740 | TCC or OD Solenoid Performance |
| P1756 | Governor Pressure Not Equal To Target |
| P1757 | Governor Pressure Sensor Offset Voltage Too Low/High |
| P1762 | Governor Pressure Solenoid Overcurrent |
| P1763 | Governor Pressure Solen |
