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 MANUALSPONTIAC2006G6 GTP, 2D COUPE, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 16 (ENGINE CONTROL SYSTEM - 2.4L - DTC P0351 TO DTC P2138)DTC P0650CIRCUIT/SYSTEM TESTING
2006 Pontiac G6 GTP, 2D Coupe, Standard
Circuit/System Testing
2006 Pontiac G6 GTP, 2D Coupe, StandardSECTION Circuit/System Testing
WARNING: This page is about a different variant/trim than selected.
- Turn OFF the ignition.
- Disconnect the engine control module (ECM).
- Turn ON the ignition with the engine OFF.
- If the MIL is still ON, test the MIL control circuit for a short to ground.
- If the MIL control circuit tested OK and the MIL stayed ON, replace the IPC.
- If the MIL control circuit tested OK and the MIL went out when the engine control module (ECM) was disconnected, replace the ECM.
- Measure for 12 volts from the MIL ignition voltage circuit in the IPC harness connector to a ground.
- If there is less than 12 volts, test the MIL ignition voltage circuit for an open or a short to ground and an open fuse.
- Remove the fuse that supplies voltage to the MIL.
- Measure for less than one volt from the MIL control circuit in the ECM harness connector to a good ground.
- If there is more than one volt, test the MIL control circuit for a short to voltage.
- Install the fuse that supplies voltage to the MIL.
- The MIL should illuminate with a 3-amp fused jumper wire connected between the MIL control circuit in the ECM harness connector and a good ground.
- If the MIL does not illuminate, test the MIL control circuit for an open or high resistance.
- If the MIL control circuit tests OK, replace the IPC.
- If the MIL does illuminate, but does not when commanded ON with a scan tool, replace the ECM.
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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.