Jeep Grand Cherokee Check Engine Light Codes: Detailed List

When the Check Engine light illuminates on your Jeep Grand Cherokee, it’s an indication that there may be an issue with the vehicle’s engine or related systems. To diagnose the specific problem, you can use an OBD-II scanner, which you plug into the port located under the dashboard.

This scanner reads the diagnostic trouble code (DTC), a numeric code that provides information about the problem in your vehicle. This code helps you identify the issue quickly so that you can take appropriate action to address the problem.

In this detailed article, we’ll provide you with a complete list of Jeep Grand Cherokee Check Engine Light Codes and explain what each one means so you can quickly figure out the issue when that light pops up. So, let’s dive in!  

Jeep Grand Cherokee Check Engine Light Codes 

Below is a detailed list of Jeep Grand Cherokee Check Engine Light Codes. These codes can help you easily identify and address specific issues.

1: Fuel System

P0001 – Fuel Volume Regulator Control Circuit/Open: Indicates a potential issue with the fuel volume regulator control circuit, affecting fuel delivery to the engine.

2: Air Flow and Pressure Sensors

P0100 – Mass or Volume Air Flow Circuit: Points to an issue within the airflow system.

Mass Air Flow Sensor Circuit Range/Performance Problem: Suggests inaccuracies in air measurement.

P0102 – Mass Air Flow Sensor Circuit Low: Indicates lower voltage from the airflow sensor.

P0103 – Mass Air Flow Sensor Circuit High: Suggests higher voltage from the airflow sensor.

P0106 – Manifold Absolute Pressure (MAP) Sensor Range/Performance Problem: Relates to intake manifold pressure measurement.

P0107 – Manifold Absolute Pressure Sensor Circuit Low Voltage: Suggests low voltage from the intake manifold pressure sensor.

P0108 – Manifold Absolute Pressure Sensor Circuit High Voltage: Indicates higher voltage from the intake manifold pressure sensor.

3: Temperature Sensors

P0112 – Intake Air Temperature Sensor Circuit Low Voltage: This suggests that the sensor measuring the temperature of the air entering your engine is not sending enough voltage.

P0113 – Intake Air Temperature Sensor Circuit High Voltage: This indicates that the sensor is sending too much voltage like your car has a fever.

P0116 – Engine Coolant Temperature Sensor Range/Performance: Points to an issue with the engine coolant temperature sensor, like your car’s thermometer acting up.

P0117 – Engine Coolant Temperature Sensor Low Voltage: This indicates that your car is saying the engine coolant sensor is not sending enough voltage signals, as if your car is feeling a chill.

P0118 – Engine Coolant Temperature Sensor High Voltage: Tells us that the sensor is sending too much voltage, and your car thinks it’s overheating.

4: Throttle and Pedal Position Sensors

P0121 – Throttle/Pedal Position Sensor/Switch ‘A’ Circuit: Suggests a performance issue in a circuit related to the throttle or pedal position sensor, like your car’s gas pedal not performing a smooth dance.

Throttle/Pedal Position Sensor/Switch ‘A’ Circuit Low Voltage: Indicates that the voltage from the throttle or pedal position sensor is too low, as if your gas pedal isn’t responding well.

P0123 – Throttle/Pedal Position Sensor/Switch ‘A’ Circuit High Voltage: This code means that the sensor is sending too much voltage, and it’s like your gas pedal is too sensitive.

5: Oxygen Sensors (O2 Sensors)

P0130 – Oxygen Sensor Circuit Bank 1, Sensor 1: This is related to an issue with the oxygen sensor circuit, like your car’s exhaust system isn’t giving the right signals.

P0131 – Oxygen Sensor Circuit Low Voltage Bank 1, Sensor 1: Indicates that the oxygen sensor’s circuit is not sending enough voltage.

P0132 – Oxygen Sensor Circuit High Voltage Bank 1, Sensor 1: Suggests that the oxygen sensor’s circuit is sending too much voltage, and your car thinks it’s being too energetic.

P0133 – Oxygen Sensor Circuit Slow Response Bank 1, Sensor 1: Indicates a slow response in the oxygen sensor circuit, like your car’s exhaust feedback, is sluggish.

P0134 – Oxygen Sensor Circuit No Activity Detected Bank 1, Sensor 1: Suggests that there’s no detectable activity in the oxygen sensor circuit, like your exhaust system is taking a nap.

P0135 – Oxygen Sensor Circuit Bank 1 Sensor 2: Relates to the oxygen sensor circuit for a different part of your exhaust system, as if a different part of your car’s lungs isn’t working properly.

P0136 – Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 2: Suggests that the voltage in the oxygen sensor circuit for this part is too low like a part of your exhaust system isn’t saying much.

P0137 – Oxygen Sensor Circuit High Voltage Bank 1 Sensor 2: This means that the circuit is sending too much voltage, and your car is saying it’s being too loud.

P0138 – Oxygen Sensor Circuit Slow Response Bank 1 Sensor 2: Indicates a slow response in the oxygen sensor circuit, similar to the first one, like a part of your exhaust system isn’t giving quick feedback.

P0139 – Oxygen Sensor Circuit No Activity Detected Bank 1 Sensor 2: Suggests that there’s no activity in the oxygen sensor circuit for this part, like that part of your exhaust system is taking a long break.

P0140 – Oxygen Sensor Circuit Bank 1 Sensor 3: Related to the oxygen sensor circuit for yet another part of your exhaust system, like another part of your car’s lungs is acting up.

P0141 – Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 3: Suggests that the voltage in the oxygen sensor circuit for this part is too low like a part of your exhaust system isn’t communicating well.

P0142 – Oxygen Sensor Circuit High Voltage Bank 1 Sensor 3: This means that the circuit is sending too much voltage, like a part of your exhaust system is too noisy.

P0143 – Oxygen Sensor Circuit Slow Response Bank 1 Sensor 3: Indicates a slow response in the oxygen sensor circuit, similar to the earlier code, like a part of your exhaust system isn’t giving quick feedback.

P0144 – Oxygen Sensor Circuit No Activity Detected Bank 1 Sensor 3: This means that there’s no activity in the oxygen sensor circuit for this part, like that part of your exhaust system is taking a very long nap.

P0145 – Oxygen Sensor Circuit Slow Response Bank 1 Sensor 3: Suggest a slow response in the oxygen sensor circuit for this part, like a part of your exhaust system isn’t communicating quickly.

P0146 – Oxygen Sensor Circuit No Activity Detected Bank 1 Sensor 3: Indicates that there’s no activity in the oxygen sensor circuit for this part like that part of your exhaust system is in deep hibernation.

P0147 – Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 3: This shows that the voltage in the oxygen sensor circuit for this part is too low like a part of your exhaust system isn’t sending strong signals.

6: Catalytic Converter Issues

P0420 – Catalyst System Efficiency Below Threshold (Bank 1): This code suggests that the catalytic converter on the first bank of the engine is not performing as efficiently as it should, potentially indicating a problem with emissions control.

P0430 – Catalyst System Efficiency Below Threshold (Bank 2): Similar to P0420, this code pertains to the catalytic converter on the second bank of the engine.

P0421 – Warm-Up Catalyst Efficiency Below Threshold (Bank 1): This code is specifically related to the efficiency of the catalytic converter on the first bank during the warm-up phase of the engine.

P0431 – Warm-Up Catalyst Efficiency Below Threshold (Bank 2): Similar to P0421, but for the second bank’s catalytic converter during the warm-up phase.

7: Spark Plug and Ignition System

P0300 – Random/Multiple Cylinder Misfire Detected: This code indicates that the engine is experiencing random misfires across multiple cylinders, which can affect performance and emissions.

P0301 – Cylinder 1 Misfire Detected: Points to a misfire in the first cylinder, which can lead to power loss and rough engine operation.

P0302 – Cylinder 2 Misfire Detected: Indicates a misfire in the second cylinder, impacting engine performance.

P0303 – Cylinder 3 Misfire Detected: Suggests a misfire in the third cylinder, affecting engine smoothness.

P0304 – Cylinder 4 Misfire Detected: Points to a misfire in the fourth cylinder, leading to performance issues.

P0305 – Cylinder 5 Misfire Detected: Indicates a misfire in the fifth cylinder, which can affect engine operation.

P0306 – Cylinder 6 Misfire Detected: Suggests a misfire in the sixth cylinder, impacting engine performance.

P0307 – Cylinder 7 Misfire Detected: Indicates a misfire in the seventh cylinder, affecting engine operation.

P0308 – Cylinder 8 Misfire Detected: Points to a misfire in the eighth cylinder, leading to engine performance issues.

P0316 – Misfire Detected on Startup (First 1000 Revolutions): This code indicates a misfire detected during the initial 1000 engine revolutions on startup, which can impact engine stability.

P0351 – Ignition Coil ‘A’ Primary/Secondary Circuit: Suggests a problem with the ignition coil in circuit ‘A,’ which can lead to ignition-related issues.

P0352 – Ignition Coil ‘B’ Primary/Secondary Circuit: Indicates an issue with the ignition coil in circuit ‘B,’ which can affect engine performance.

P0353 – Ignition Coil ‘C’ Primary/Secondary Circuit: Points to a problem with the ignition coil in circuit ‘C,’ potentially leading to ignition system problems.

P0354 – Ignition Coil ‘D’ Primary/Secondary Circuit: Indicates an issue with the ignition coil in circuit ‘D,’ which can affect ignition and engine operation.

8: Other Common Codes

P0440 – Evaporative Emission Control System Malfunction: This code indicates a problem with the vehicle’s evaporative emissions system, which helps control harmful emissions.

P0442 – Evaporative Emission Control System Leak Detected (Small Leak): Points to a small leak in the evaporative emissions system, potentially allowing harmful emissions to escape.

P0446 – Evaporative Emission Control System Vent Control Circuit: Suggests a problem with the vent control circuit within the evaporative emissions system, affecting emission control.

P0455 – Evaporative Emission Control System Leak Detected (Large Leak): Indicates a large leak in the evaporative emissions system, potentially allowing significant emissions to escape.

1: Conclusion:

Understanding these check engine light codes for your Jeep Grand Cherokee is like learning a secret language your car speaks. It’s essential for diagnosing and fixing issues that can affect your car’s performance and environmental impact. When your check engine light flashes and you encounter any of these codes, it’s like your car’s way of saying, ‘Hey, something’s not right here.’ To resolve the issue, you should either consult a professional mechanic or roll up your sleeves and perform some further diagnostics. Taking action promptly can help you avoid more significant and expensive repairs down the road.

 2: FAQs

Q: What does it mean when the Check Engine light comes on in my Jeep Grand Cherokee?

A: The Check Engine light illuminates when the vehicle’s onboard computer, or Engine Control Module (ECM), detects a potential issue with the engine or related systems. It serves as a warning that something might be wrong. To identify the specific problem, you’ll need to retrieve the diagnostic trouble code (DTC) using an OBD-II scanner.

Q: How can I check and interpret the Check Engine light codes in my Jeep Grand Cherokee?

A: To check and interpret the Check Engine light codes, you’ll need an OBD-II scanner, which you can plug into a port typically located under the dashboard. Once connected, the scanner will retrieve a numeric DTC that corresponds to the issue.

You can then refer to a list of DTCs specific to Jeep Grand Cherokee to understand the problem. Each code provides information about a particular fault in your vehicle, helping you pinpoint the issue for necessary repairs.

Q: Can I continue driving my Jeep Grand Cherokee with the Check Engine light on?

A: In some cases, it may be safe to drive with the Check Engine light on, but it’s generally recommended to have the issue diagnosed and repaired as soon as possible.

While some issues might not immediately affect your vehicle’s drivability, others could lead to more significant problems if left unaddressed. It’s best to consult a mechanic to determine the severity of the issue and whether it’s safe to continue driving with the light illuminated.