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 MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1534 (HYBRID ENGINE CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P0AFFCIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Circuit/System Testing
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Circuit/System Testing
WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
- Remove the B+ harness connector X3 at the APM.
- Connect a test lamp between the 12-volt battery positive and the APM connector X3 at the module.
- Ignition ON, observe the 12-volt parameter in the APM data list. The parameter should be within 0.5 volt of the actual 12-volt battery voltage.
- If the voltage is not within the specified range, replace the APM.
- Ignition OFF, Remove the positive connection at the 12-volt battery.
- Measure the resistance between the X3 connector and the battery positive connection.
- If the resistance is greater than 1.0 ohm, repair the high resistance condition in the 12-volt circuit.
- If the resistance is less than 1.0 ohm, replace the battery positive cable - control module to auxiliary BEC.
RENDER: 1.0x
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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.