The P0650 trouble code indicates an issue with the malfunction indicator lamp (MIL) control circuit. The MIL, also known as the check engine light (CEL), is controlled by the engine control module (ECM) or powertrain control module (PCM). This code is set when the ECM or PCM detects a malfunction in the circuit responsible for controlling the MIL.
P0650 Malfunction Indicator Lamp (MIL) Control Circuit Malfunction
Code symptoms P0650.
1. Illumination of the MIL when there are no apparent issues with the vehicle’s operation.
2. Inoperative MIL; the light does not illuminate when it should.
3. Other trouble codes may be present in addition to P0650.
This code is common in brands such as:: Chevrolet, Renault, Ford, Toyota, Nissan, Mercedes Benz, Honda.
Causes of the code P0650.
1. Faulty MIL bulb or circuitry.
2. Open or short circuit in the MIL control circuit.
3. Faulty ECM or PCM.
4. Wiring or connector issues in the MIL control circuit.
Code Solutions P0650.
1. Inspect the MIL bulb and replace it if it is found to be faulty.
2. Check the wiring and connectors in the MIL control circuit for any signs of damage, corrosion, or loose connections. Repair or replace damaged components as necessary.
3. Clear the trouble codes and perform a test drive to verify that the issue has been resolved. If the code persists, further diagnosis may be required, including testing the voltage output of the ECM or PCM and the MIL control circuit.
4. Ensure that the vehicle’s battery is in good condition and fully charged, as low voltage can sometimes trigger false trouble codes related to the MIL.
5. Follow manufacturer-specific diagnostic procedures outlined in the vehicle’s service manual to accurately diagnose and repair issues related to the MIL control circuit. If needed, seek assistance from a qualified technician or dealership.