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 2174 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 6.6L (LMM) - DTC P2544 TO DTC P2693)DTC P2564 OR P2565COMPONENT TESTING
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Component Testing
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Component Testing
WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
You must perform the Circuit/System Testing in order to verify the integrity of the TC vane position sensor circuits before proceeding with Component Testing.
Erratic Signal Test
- Ignition OFF, disconnect the harness connector at the TC vane position sensor.
- Remove the TC vane position sensor.
- Connect the TC vane position sensor harness connector.
- Ignition ON, observe the scan tool TC Vane Position Sensor voltage while slowly depressing the plunger at the end of the TC Vane Position Sensor. The voltage should decrease smoothly from approximately 4.9-0.2 V.
- If the TC Vane Position Sensor voltage drops out or spikes, replace the TC vane position sensor. It is normal for the TC Vane Position voltage to quickly return to approximately 4.9 V as the plunger reaches its fully depressed position.
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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.