When the check engine light in your Jeep Wrangler illuminates, it indicates that the vehicle’s onboard computer has detected an issue. To pinpoint the problem, you can rely on the Onboard Diagnostics II (OBD-II) system, which generates specific trouble codes to assist in identifying and diagnosing the issue. In this guide, we’ll provide you with a comprehensive list of Jeep Wrangler check engine light codes, along with explanations for each code, to help you understand and address any issues that may arise.
Jeep Wrangler check engine light codes
Below is the detailed list of Jeep Wrangler check engine light codes, which provides valuable information for diagnosing and addressing issues with your vehicle.
1: Airflow and Temperature Sensors codes:
P0100 – Mass or Volume Air Flow Circuit Malfunction: Indicates a problem with the sensor or its circuit that measures the incoming air into the engine.
P0101 – Mass or Volume Air Flow Circuit Range/Performance Problem: Suggests issues with the sensor’s range or performance.
P0102 – Mass or Volume Air Flow Circuit Low Input: The sensor reports low input, indicating a possible airflow problem.
P0103 – Mass or Volume Air Flow Circuit High Input: The sensor reports high input, indicating another potential airflow issue.
P0112 – Intake Air Temperature Sensor Circuit Low Input: Reports a low input from the intake air temperature sensor.
P0113 – Intake Air Temperature Sensor Circuit High Input: Reports a high input from the intake air temperature sensor.
P0117 – Engine Coolant Temperature Circuit Low Input: Indicates a low input from the engine coolant temperature sensor.
P0118 – Engine Coolant Temperature Circuit High Input: Reports a high input from the engine coolant temperature sensor.
2: Throttle and Pedal Position Sensors codes
P0122 – Throttle/Pedal Position Sensor A Circuit Low Input: Indicates a low input signal from the throttle or pedal position sensor A.
P0123 – Throttle/Pedal Position Sensor A Circuit High Input: Similar to P0122 but reports a high input signal.
3: Coolant Temperature and Fuel Control codes
P0125 – Insufficient Coolant Temperature for Closed-Loop Fuel Control: Indicates that the engine hasn’t reached the necessary temperature for efficient fuel control.
4: Oxygen Sensors (Bank 1) codes
P0130 – Oxygen Sensor Circuit Malfunction (Bank 1, Sensor 1): Suggest an issue with the primary oxygen sensor before the catalytic converter.
P0131 – Oxygen Sensor Circuit Low Voltage (Bank 1, Sensor 1): Reports low voltage from the Bank 1, Sensor 1 oxygen sensor.
P0132 – Oxygen Sensor Circuit High Voltage (Bank 1, Sensor 1): Indicates high voltage from the Bank 1, Sensor 1 oxygen sensor.
P0133 – Oxygen Sensor Circuit Slow Response (Bank 1, Sensor 1): Suggests a slow response from the Bank 1, Sensor 1 oxygen sensor.
P0134 – Oxygen Sensor Circuit No Activity Detected (Bank 1, Sensor 1): Indicates no activity from the Bank 1, Sensor 1 oxygen sensor.
P0135 – Oxygen Sensor Heater Circuit Malfunction (Bank 1, Sensor 1): Suggest an issue with the heater circuit of the Bank 1, Sensor 1 oxygen sensor.
P0136 – Oxygen Sensor Circuit Malfunction (Bank 1, Sensor 2): This relates to an issue with the secondary oxygen sensor after the catalytic converter.
P0137 – Oxygen Sensor Circuit Low Voltage (Bank 1, Sensor 2): Reports low voltage from the Bank 1, Sensor 2 oxygen sensor.
P0138 – Oxygen Sensor Circuit High Voltage (Bank 1, Sensor 2): Indicates high voltage from the Bank 1, Sensor 2 oxygen sensor.
P0139 – Oxygen Sensor Circuit Slow Response (Bank 1, Sensor 2): Suggests a slow response from the Bank 1, Sensor 2 oxygen sensor.
P0140 – Oxygen Sensor Circuit No Activity Detected (Bank 1, Sensor 2): Indicates no activity from the Bank 1, Sensor 2 oxygen sensor.
P0141 – Oxygen Sensor Heater Circuit Malfunction (Bank 1, Sensor 2): Suggest an issue with the heater circuit of the Bank 1, Sensor 2 oxygen sensor.
5: Oxygen Sensors (Bank 2) codes
P0150 – Oxygen Sensor Circuit Malfunction (Bank 2, Sensor 1): This indicates an issue with the primary oxygen sensor on Bank 2.
P0151 – Oxygen Sensor Circuit Low Voltage (Bank 2, Sensor 1): Reports low voltage from the Bank 2, Sensor 1 oxygen sensor.
P0152 – Oxygen Sensor Circuit High Voltage (Bank 2, Sensor 1): Indicates high voltage from the Bank 2, Sensor 1 oxygen sensor.
P0153 – Oxygen Sensor Circuit Slow Response (Bank 2, Sensor 1): Suggests a slow response from the Bank 2, Sensor 1 oxygen sensor.
P0154 – Oxygen Sensor Circuit No Activity Detected (Bank 2, Sensor 1): Indicates no activity from the Bank 2, Sensor 1 oxygen sensor.
P0155 – Oxygen Sensor Heater Circuit Malfunction (Bank 2, Sensor 1): Suggest an issue with the heater circuit of the Bank 2, Sensor 1 oxygen sensor.
P0156 – Oxygen Sensor Circuit Malfunction (Bank 2, Sensor 2): This relates to an issue with the secondary oxygen sensor on bank 2.
6: Fuel Injection codes
P0201 – Injector Circuit/Open – Cylinder 1: Indicates an issue with the fuel injector circuit.
7: Fuel Trim codes
P0171 – System Too Lean (Bank 1): This code indicates that the engine is running too lean on bank 1 of the exhaust system. It could be caused by a vacuum leak or a fuel delivery problem.
P0172 – System Too Rich (Bank 1): Suggests that the engine is running too rich on bank 1 of the exhaust system, often due to excessive fuel delivery.
P0174 – System Too Lean (Bank 2): Similar to P0171, this code refers to Bank 2 of the exhaust system.
P0175 – System Too Rich (Bank 2): Indicates that the engine is running too rich on Bank 2 of the exhaust system, often due to excessive fuel delivery.
This comprehensive list of OBD-II trouble codes is essential for diagnosing issues in your Jeep Wrangler. Always consult a qualified mechanic or the appropriate service manual for accurate diagnosis and repairs.
Conclusions:
In conclusion, the check engine light in your Jeep Wrangler serves as a valuable indicator of potential issues within your vehicle. When it illuminates, the Onboard Diagnostics II (OBD-II) system generates specific trouble codes to help you identify and diagnose these problems. The comprehensive list of Jeep Wrangler check engine light codes, along with explanations provided in this guide, equips you with the knowledge needed to understand and address any issues that may arise.
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