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 12 (ENGINE CONTROL SYSTEM - 2.4L - DTC P0010 TO DTC P0341)DTC P0117 OR P0118CIRCUIT/SYSTEM TESTINGDTC P0118
2006 Pontiac G6 GTP, 2D Coupe, Standard
DTC P0118
2006 Pontiac G6 GTP, 2D Coupe, StandardSECTION DTC P0118
WARNING: This page is about a different variant/trim than selected.
- Turn ON the ignition, with the engine OFF.
- Disconnect the ECT sensor.
- Measure for the proper range of 4.9-5.2 volts between the ECT sensor signal circuit and a good ground with a DMM.
- If the voltage is more than 5.2 volts, test the ECT sensor signal circuit for a short to voltage.
- If the voltage is less than 4.9 volts, test the ECT sensor signal circuit for a high resistance or an open circuit.
- If the ECT sensor signal circuit tests normal and the voltage is still not within the proper range, then replace the ECM.
- Turn OFF the ignition and all electrical accessories. Allow sufficient time for the control module to power down before taking a resistance measurement.
- Measure for a proper value of less than 5 ohms of resistance between the ECT low reference circuit and a good ground.
- If the resistance is more than 5 ohms, test the low reference circuit for a high resistance or an open circuit.
- If the ECT low reference circuit tests normal, then replace the ECM.
- Turn ON the ignition, with the engine OFF.
- Observe the ECT Sensor parameter while connecting and disconnecting a 3-amp fused jumper wire between the ECT sensor signal and low reference circuits. This should cause the ECT Sensor parameter to toggle between the upper and lower temperature limits.
- If the ECT Sensor parameter does not toggle, replace the ECM.
- If the ECT Sensor parameter does toggle, then test the ECT sensor signal circuit for a short to another 5-volt reference circuit.
- If the ECT sensor signal circuit is not shorted to another 5-volt reference circuit, then replace the ECT sensor.
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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.