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 1233 (BATTERY, CHARGING SYSTEM AND STARTING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P0621CIRCUIT/SYSTEM TESTINGLY7 ENGINE
2006 Pontiac G6 GTP, 2D Coupe, Standard
LY7 Engine
2006 Pontiac G6 GTP, 2D Coupe, StandardSECTION LY7 Engine
WARNING: This page is about a different car, the 2010 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
- Verify that a test lamp illuminates between the G13 generator B+ terminal + X2 and ground.
- If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
- Ignition OFF, disconnect the harness connector at the generator.
- Ignition ON, test for less than 1 V between the control circuit terminal 1 and ground.
- If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
- Engine running, test for greater than 3.5 V between the control circuit terminal 1 and ground.
- If less than the specified range, test the control circuit for a short to ground, an open or a high resistance. If the circuit tests normal, replace the K20 ECM.
- If the circuit tests normal, test or replace the G13 generator.
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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.