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 13 (ENGINE CONTROL SYSTEM - 3.5L - DTC P0016 TO DTC P0140)DTC P0116, P0125, OR P0128CIRCUIT/SYSTEM VERIFICATION
2006 Pontiac G6 GTP, 2D Coupe, Standard
Circuit/System Verification
2006 Pontiac G6 GTP, 2D Coupe, StandardSECTION Circuit/System Verification
WARNING: This page is about a different variant/trim than selected.
- If the ignition has been OFF for 8 hours or more, the ECT and the IAT, should be within 11°C (20°F) of each other and also the ambient temperature. Turn ON the ignition, with the engine OFF, and use a scan tool to observe the IAT and the ECT sensor parameters.
- Inspect the ECT sensor terminals for corrosion, and for engine coolant leaking through the sensor.
- Use the scan tool to verify the proper operation of the engine cooling system fans.
- Turn OFF the ignition.
- Inspect the cooling system surge tank for the proper engine coolant level. Refer to COOLING SYSTEM LEAK TESTING and DRAINING AND FILLING COOLING SYSTEM .
- Verify the proper heat range, and the operation of the thermostat. Refer to THERMOSTAT DIAGNOSIS .
CAUTION:
Caution: Under pressure, the temperature of the solution in the radiator can be considerably higher, without boiling. Removing the radiator cap while the engine is hot (pressure is high), will cause the solution to boil instantaneously, with explosive force. The solution will spew out over the engine, fenders, and the person removing the cap. Serious bodily injury may result. Flammable antifreeze, such as alcohol, is not recommended for use at any time. Flammable antifreeze could cause a serious fire.
IMPORTANT:
A critical analysis of the operation of the thermostat is necessary, to properly diagnose these DTCs.
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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.