The P0650 code indicates that the engine control module has detected an open circuit in the Malfunction Indicator Lamp (MIL) control circuit. This means the electrical path between the computer and the check engine light on the dashboard is interrupted.
The bulb or LED within the instrument cluster has burned out or suffered an internal failure.
A wire in the circuit between the PCM and the instrument cluster is severed, frayed, or broken.
Corrosion at the instrument cluster or PCM connectors has created an open circuit.
Internal circuitry or solder joint failure within the dashboard instrument cluster.
The internal driver circuit responsible for controlling the MIL has failed.
No, this code refers specifically to the electrical circuit of the warning light itself, not a mechanical failure of the engine.
No. While the PCM is a potential cause, the issue is far more likely to be a failed bulb, a wiring break, or a fault within the instrument cluster.
Yes, the vehicle will remain drivable, but the driver will not be alerted to other engine faults because the dashboard light may not function.