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P code powertrain High severity

P0653 Malfunction Indicator Lamp (MIL) Control Circuit High

The OBD2 code P0653 indicates a malfunction in the Malfunction Indicator Lamp (MIL) control circuit, specifically that the circuit is reading a high voltage or signal when it shouldn't be

Definition

The OBD2 code P0653 indicates a malfunction in the Malfunction Indicator Lamp (MIL) control circuit, specifically that the circuit is reading a high voltage or signal when it shouldn't be

Common causes

  • Faulty Engine Control Module (ECM)
  • Short circuit in the MIL control circuit
  • Open circuit in the MIL control circuit
  • Corroded or damaged wiring/connectors
  • Faulty MIL indicator bulb
  • Issues with the vehicle's instrument cluster
  • Software issues in the ECM

Common misdiagnoses

  • Faulty Engine Control Module (ECM)
  • Bad wiring or connectors
  • Faulty Malfunction Indicator Lamp (MIL)
  • Issues with other sensor circuits
  • Faulty ignition switch
  • Battery or charging system problems
  • Faulty body control module (BCM)

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide more context and help identify related issues

  2. 2. Inspect the MIL Bulb

    Ensure that the MIL (check engine light) bulb is functioning properly. If the bulb is burned out, it may not illuminate when the engine is running, leading to this code

  3. 3. Examine the Wiring and Connectors

    Inspect the wiring and connectors associated with the MIL circuit for any signs of damage, corrosion, or loose connections. Pay special attention to the wiring harness and connectors leading to the Engine Control Module (ECM)

  4. 4. Test the MIL Circuit

    Using a multimeter, check the voltage and ground at the MIL circuit. Ensure that the circuit is receiving the correct voltage and that the ground is solid. If there is no voltage or ground, trace the circuit back to find the fault

  5. 5. Check the ECM

    If the wiring and bulb are in good condition, the issue may lie within the Engine Control Module (ECM) itself. Check for any software updates or reprogramming that may be needed. In some cases, the ECM may need to be replaced

  6. 6. Inspect Related Components

    Check other components that may be related to the MIL circuit, such as fuses, relays, and any associated sensors. A blown fuse or faulty relay can cause issues with the MIL circuit

  7. 7. Clear the Code and Test Drive

    After performing the above checks and repairs, clear the trouble code using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  8. 8. Consult Repair Manuals or Technical Service Bulletins (TSBs)

    If the issue persists, consult the vehicle's repair manual or look for any TSBs related to the P0653 code for specific guidance related to your vehicle make and model

  9. 9. Seek Professional Help

    If you are unable to resolve the issue after following these steps, it may be best to consult a professional mechanic or technician who has experience with OBD-II diagnostics. By following these troubleshooting steps, you should be able to identify and resolve the issue causing the P0653 code