Ultimate Guide to Jeep OBD-II Trouble Codes & Diagnostic Help

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David Lawrence

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?

Jeep Obd Obd2 Codes

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

CodeDescription
P0016Crankshaft/Camshaft Timing Misalignment
P0031O2 Sensor 1/1 Heater Circuit Low
P0032O2 Sensor 1/1 Heater Circuit High
P0037O2 Sensor 1/2 Heater Circuit Low
P0038O2 Sensor 1/2 Heater Circuit High
P0051O2 Sensor 2/1 Heater Circuit Low
P0106Barometric Pressure Out of Range
P0107MAP Sensor Voltage Too Low
P0108MAP Sensor Voltage Too High
P0112Intake Air Temp Sensor Voltage Low
P0113Intake Air Temp Sensor Voltage High
P0116Engine Coolant Temperature Circuit Range/Performance Problem
P0117Engine Coolant Temperature Circuit Low Input
P0118Engine Coolant Temperature Circuit High Input
P0122Throttle Position Sensor Voltage Low
P0123Throttle Position Sensor Voltage High
P0128Thermostat Rationality
P0131O2 Sensor 1/1 Circuit Low Voltage
P0132O2 Sensor 1/1 Circuit High Voltage
P0133O2 Sensor 1/1 Circuit Slow Response
P0134O2 Sensor 1/1 Circuit No Activity Detected
P0135O2 Sensor 1/1 Heater Circuit Malfunction
P0137O2 Sensor 1/2 Circuit Low Voltage
P0138O2 Sensor 1/2 Circuit High Voltage
P0140O2 Sensor 1/2 Circuit No Activity Detected
P0141O2 Sensor 1/2 Heater Circuit Malfunction
P0151O2 Sensor 2/1 Circuit Low Voltage
P0152O2 Sensor 2/1 Circuit High Voltage
P0153O2 Sensor 2/1 Circuit Slow Response
P0154O2 Sensor 2/1 Circuit No Activity Detected
P0155O2 Sensor 2/1 Heater Circuit Malfunction
P0171System Too Lean (Bank 1)
P0172System Too Rich (Bank 1)
P0174System Too Lean (Bank 2)
P0175System Too Rich (Bank 2)
P0300Random/Multiple Cylinder Misfire Detected
P0301 Cylinder 1 Misfire Detected
P0302Cylinder 2 Misfire Detected
P0303Cylinder 3 Misfire Detected
P0304Cylinder 4 Misfire Detected
P0305Cylinder 5 Misfire Detected
P0306Cylinder 6 Misfire Detected
P0325Knock Sensor 1 Circuit Malfunction (Bank 1 or Single Sensor)
P0335Crankshaft Position Sensor Circuit Malfunction
P0340Camshaft Position Sensor Circuit Malfunction
P0351Ignition Coil A Primary/Secondary Circuit Malfunction
P0352Ignition Coil B Primary/Secondary Circuit Malfunction
P0353Ignition Coil C Primary/Secondary Circuit Malfunction
P0354Ignition Coil D Primary/Secondary Circuit Malfunction
P0355Ignition Coil E Primary/Secondary Circuit Malfunction
P0356Ignition Coil F Primary/Secondary Circuit Malfunction
P0401EGR System Failure
P0420Catalyst System Efficiency Below Threshold (Bank 1)
P0430Catalyst System Efficiency Below Threshold (Bank 2)
P0441Evaporative Emission Control System Incorrect Purge Flow
P0442Evaporative Emission Control System Leak Detected (Small Leak)
P0455Evaporative Emission Control System Leak Detected (Large Leak)
P0456Evaporative Emission Control System Leak Detected (Very Small Leak)
P0461Fuel Level Sensor Circuit Range/Performance
P0462Fuel Level Sensor Circuit Low Input
P0463Fuel Level Sensor Circuit High Input
P0480Cooling Fan 1 Control Circuit Malfunction
P0481Cooling Fan 2 Control Circuit Malfunction
P0500Vehicle Speed Sensor Malfunction
P0501Vehicle Speed Sensor Range/Performance
P0506Idle Speed Performance Lower Than Expected
P0507Idle Speed Performance Higher Than Expected
P0513Invalid Skim Key
P0522Engine Oil Pressure Too Low
P0562Battery Voltage Low
P0563Battery Voltage High
P0571Brake Switch 1 Performance
P0579Speed Control Switch 1 Performance
P0600PCM Failure SPI Communications
P0601PCM Internal Controller Failure
P0604RAM Check Failure
P0605ROM Check Failure
P0615Starter Relay Control Circuit
P0622Generator Field Not Switching Properly
P0645A/C Clutch Relay Circuit
P0700EATX Controller DTC Present
P0703Brake Switch Sense Circuit
P0711Trans Temp Sensor, No Temp Rise After Start
P0712Trans Temp Sensor Voltage Too Low
P0713Trans Temp Sensor Voltage Too High
P0720Low Output SPD Sensor RPM, Above 15 MPH
P0740Torq Con Clu, No RPM Drop at Lockup
P0743Torque Converter Clutch Solenoid/Trans Relay Circuit Electrical
P0748Pressure Control Solenoid Electrical
P07511-2 Shift Solenoid Performance
P07531-2 Shift Solenoid Circuit Electrical
P07562-3 Shift Solenoid Performance
P07582-3 Shift Solenoid Circuit Electrical
P07613-4 Shift Solenoid Performance
P07633-4 Shift Solenoid Circuit Electrical
P07664-5 Shift Solenoid Performance
P07684-5 Shift Solenoid Circuit Electrical
P0888Relay Control Circuit Low
P0889Relay Control Circuit High
P1281Engine is Cold Too Long
P1282Fuel Pump Relay Circuit
P1288Intake Manifold Short Runner Tuning Valve Circuit
P1391Intermittent Loss of CMP or CKP
P1398Mis-Synchronization between Cam and Crank Signals
P1491Radiator Fan Control Relay Circuit
P1494Leak Detection Pump Solenoid Circuit
P1495Leak Detection Pump Solenoid Circuit
P1594Charging System Voltage Too High
P1595Speed Control Related DTCs
P1596Speed Control Related DTCs
P1597Speed Control Related DTCs
P1598Speed Control Related DTCs
P1599Speed Control Related DTCs
P1603PCM Internal Dual-Port RAM Communication Error
P1604PCM Internal Dual-Port RAM Communication Error
P1684Battery Disconnected Within Last 50 Starts
P1685Skim Invalid Key
P1686No SKIM Key Detected (SKIM-to-PCM Signal Missing)
P1687No SKIM Key Detected (SKIM-to-PCM Signal Missing)
P1688Internal Fuel Injection Pump Controller Failure
P1689No Communication Between PCM and Fuel Injection Pump Module
P1690Fuel Injection Pump CKP Signal Error
P1691Fuel Injection Pump Power Circuit Problem
P1692DTC Detected in ECU or TCU
P1693DTC Detected in ECU or TCU
P1694No CCD Messages Received From ECU or TCU
P1695No CCD Messages Received From ECU or TCU
P1696PCM Failure EEPROM Write Denied
P1697PCM Failure SRI Mile Not Stored
P1698No CCD Messages Received From ECU or TCU
P1719Skip Shift Solenoid Circuit
P1740TCC or OD Solenoid Performance
P1756Governor Pressure Not Equal To Target
P1757Governor Pressure Sensor Offset Voltage Too Low/High
P1762Governor Pressure Solenoid Overcurrent
P1763Governor Pressure Solen
About the author
David Lawrence
David grew up among mechanics and off-road enthusiasts, gaining deep knowledge in car mods, off-roading techniques, and automotive engineering, making him a trusted 4x4 expert.

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