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Engine-Codes.com | All About OBDII Engine Codes

P0650 Cadillac

P0650 Cadillac - Malfunction Indicator Lamp Control Circuit Malfunction

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P0650 Cadillac Comments |  Add Comment
Possible causes
- Faulty Malfunction Indicator Lamp Bulb
- Malfunction Indicator Lamp Bulb harness is open or shorted
- Malfunction Indicator Lamp Bulb circuit poor electrical connection
- Faulty Engine Control Module (ECM)
Help with Possible causes What does this mean?
When is the code detected?
If the fault detection circuit senses a voltage other than what is expected, the fault line status will change causing the P0650 code will set.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P0650 Cadillac Description

A voltage is supplied directly to the malfunction indicator lamp (MIL). The Powertrain Control Module (PCM) controls the lamp by grounding the control circuit via an internal switch called a driver. The primary function of the driver is to supply the ground for the component being controlled. Each driver has a fault line which is monitored by the PCM. When the PCM is commanding a component ON, the voltage of the control circuit should be near 0 volts. When the PCM is commanding the control circuit to a component OFF, the voltage potential of the circuit should be near battery voltage.

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