P0650 GMC - Malfunction Indicator Lamp Control Circuit Malfunction
- 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)
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.
- Engine Light ON (or Service Engine Soon Warning Light)
P0650 Gmc DescriptionA 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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