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 17 (ENGINE CONTROL SYSTEM - 3.5L - DTC P0401 TO DTC P1133)DTC P0403CIRCUIT/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.
- Disconnect the EGR valve harness connector and probe the EGR High Control circuit with a test lamp connected to ground. Command the EGR valve from 0% to 10% and back to 0%. The test lamp should illuminate when commanded to 10%.
- If the test lamp remains illuminated when commanded to 0%, test the EGR High Control circuit for a short to voltage.
- If the test lamp does not illuminate, test the EGR High Control circuit for an open, high resistance, or short to ground. If the circuit tests normal, replace the control module.
- Connect a test lamp between the EGR High Control circuit and the EGR Low Control Circuit. Command the EGR valve from 0% to 10% and back to 0%. The test lamp should illuminate when commanded to 10%.
- If the test lamp illuminates when commanded to 10% replace the EGR Valve.
- If the test lamp does not illuminate, test the EGR Low Control circuit for an open, high resistance.
- If all circuits test OK, replace the control module.
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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.