Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC2007SIERRA CLASSIC 1500 2WD V6-4.3LREPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONP CODE CHARTSP0650
2007 GMC Sierra Classic 1500 2WD V6-4.3L
P0650
2007 GMC Sierra Classic 1500 2WD V6-4.3LSECTION P0650
DTC P0650
CIRCUIT DESCRIPTION
The malfunction indicator lamp (MIL) is located on the instrument panel cluster (IPC). The MIL informs the driver that an emission system fault has occurred and that the engine control system requires service. The control module monitors the MIL control circuit for conditions that are incorrect for the commanded state of the MIL. For example, a failure condition exists if the control module detects low voltage when the MIL is commanded OFF, or high voltage when the MIL is commanded ON. If the control module detects an improper voltage on the MIL control circuit, DTC P0650 will set.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC P0650 Malfunction Indicator Lamp (MIL) Control Circuit
CONDITIONS FOR RUNNING THE DTC
- The engine speed is more than 400 RPM.
- The ignition voltage is between 6-18 volts.
- DTC P0650 runs continuously when the above conditions are met.
CONDITIONS FOR SETTING THE DTC
The control module detects that the commanded state of the MIL driver and the actual state of the control circuit do not match for more than 5 seconds.
ACTION TAKEN WHEN THE DTC SETS
The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.
CONDITIONS FOR CLEARING THE MIL/DTC
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Clear the MIL and the DTC with a scan tool.
TEST DESCRIPTION
Step 1 - Step 11:
Step 12 - Step 18:
The numbers below refer to the step numbers on the diagnostic table.
5. This step tests for a short to ground in the MIL control circuit. With the powertrain control module (PCM) disconnected and the ignition ON, the MIL should be OFF.
6. This step tests for a short to voltage on the MIL control circuit. With the fuse removed, there should be no voltage on the MIL control circuit.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.