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 1175 (CRUISE CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P0571COMPONENT 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 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Relay Test
- Ignition OFF, disconnect the RUN/CRANK relay.
- Test for 60-180 ohms of resistance between terminals 85 and 86.
- If the resistance is not within the specified range, replace the relay.
- Test for infinite resistance between the following terminals:
- 30 and 86
- 30 and 87
- 30 and 85
- 85 and 87
- If less than infinite resistance, replace the RUN/CRANK relay.
- Install a 20-amp fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 2.0 ohms of resistance between terminals 30 and 87.
- If greater than 2.0 ohms, replace the RUN/CRANK relay.
Switch Test
- Ignition OFF, disconnect the stop lamp switch.
- With the brake pedal released, measure for infinite resistance between terminals A and B of the switch.
- If resistance is measured, replace the switch.
- With the brake pedal released, measure for less than 1.0 ohm resistance between terminals C and D of the switch.
- If resistance is not as specified, replace the switch.
- With the brake pedal applied, measure for less than 1.0 ohm resistance between terminals A and B of the switch.
- If resistance is not as specified, replace the switch.
- With the brake pedal applied, measure for infinite resistance between terminals C and D of the switch.
- If resistance is measured, replace the switch.
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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.