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 CARSECTION 368 (ENGINE CONTROL SYSTEM - 3.8L - DTC P0451 TO DTC P2120)DTC P1404CIRCUIT/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 car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
- With the ignition ON and the engine OFF, observe the DTC information on the scan tool.
- If DTC P0641 is also set, diagnose those DTCs first. Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Start the engine and observe the EGR Position parameter. The EGR Position parameter should be less than 1 percent.
- Disconnect the EGR harness connector and observe the EGR Position Sensor parameter. The EGR Position Sensor parameter should display 0 percent.
- If the EGR Position Sensor parameter is more than 0 percent test the EGR Position Sensor signal circuit for a short to voltage or a faulty control module.
- Command the EGR valve from 0 percent to 100 percent with a scan tool and observe the EGR Position Variance parameter. The EGR Position Variance parameter should be less than 15 percent.
- If the EGR Position Variance parameter is more than 15 percent test the EGR 5-volt reference circuit and the EGR Low Reference circuit for an open or high resistance or a faulty control module.
- Using a 3-amp fused jumper wire jumper the EGR 5-volt reference circuit to the EGR Position Sensor Signal circuit at the EGR harness connector and monitor the EGR Position Sensor parameter. The EGR Position Sensor parameter should display 99 percent.
- If the EGR Position Sensor parameter is less than 99 percent test for an open, high resistance or a short to ground in the EGR Pintle Position Signal circuit.
- Disconnect the control module and measure the resistance of the EGR High Control circuit and the EGR Low Control circuit. There should be less than 3 ohms of resistance on each circuit.
- If the resistance is more than 3 ohms, test each circuit for high resistance.
- If all circuits test OK, replace the EGR valve.
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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.