DTC P0650 signifies a fault in the Malfunction Indicator Lamp (MIL) control circuit. This code indicates an issue with the vehicle’s ability to control the MIL, commonly known as the Check Engine Light.

1. What does P0650 code mean?

DTC P0650 indicates that the vehicle’s Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected a malfunction in the control circuit for the Malfunction Indicator Lamp (MIL), which is commonly referred to as the Check Engine Light. This light serves to alert the driver about potential issues within the engine or related systems.

2. What are the causes of DTC P0650?

Potential causes for DTC P0650 include:

• Faulty MIL Lamp: A malfunctioning or defective MIL lamp or its related circuitry.
• Damaged Wiring or Connectors: Corroded, damaged, or loose wiring and connectors within the MIL control circuit.
• ECM/PCM Issues: Internal issues within the ECM/PCM that affect its ability to control the MIL lamp.

3. What are the symptoms of DTC P0650?

Symptoms related to DTC P0650 may include:

• Illuminated Check Engine Light: The most common symptom is the Check Engine Light staying on or failing to illuminate when necessary.
• Loss of Communication: Issues with communication between the ECM/PCM and the MIL lamp.

4. How to diagnose DTC P0650?

Diagnosing DTC P0650 involves several steps:

• Code Scan: Use an OBD-II scanner to retrieve the trouble codes and pertinent data stored in the ECM/PCM.
• Visual Inspection: Examine the MIL lamp, wiring, and connectors for any visible signs of damage, corrosion, or loose connections.
• Wiring Checks: Perform voltage and continuity checks on the MIL control circuit using a multimeter to identify electrical issues.
• ECM/PCM Testing: Test the ECM/PCM functionality and its ability to control the MIL lamp.

5. How to fix DTC P0650 problem?

Potential steps to fix DTC P0650 may include:

• Repair or Replace Wiring: Repair or replace damaged or faulty wiring, connectors, or terminals within the MIL control circuit.
• Replace Faulty MIL Lamp: If the MIL lamp is defective, consider repairing or replacing it.
• ECM/PCM Replacement: In rare cases, a malfunctioning ECM/PCM may necessitate replacement.
• Clear Error Codes: After making repairs, clear the error codes using an OBD-II scanner to reset the system and check if the issue persists.

Conclusion

DTC P0650 indicates a malfunction in the Malfunction Indicator Lamp (MIL) control circuit, affecting the Check Engine Light’s functionality. Prompt diagnosis and rectification of the underlying issues are crucial to ensure the accurate functioning of the MIL and proper monitoring of the vehicle’s systems.