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 1340 (CRUISE CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESCRUISE CONTROL MALFUNCTIONCIRCUIT/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 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect the harness connector X2 at the multifunction switch.
- Ignition ON, test for greater than 10 volts between the supply voltage circuit terminal 1 and ground.
- If less than the specified range, test the supply voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
- Ignition ON, test for 0.0 volts between the cruise control switch signal circuit and ground.
- If greater than the specified value, test the signal circuit terminal 5 for a short to voltage. If the circuit tests normal, replace the IPM.
- Ignition OFF, connect the harness connector X2 at the multifunction switch.
- Ignition ON, with the cruise control switch in the ON position, observe the scan tool Cruise parameter. The parameter should display 29 Counts.
- If not the specified value, test the signal circuit terminal 5 for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the multifunction switch.
- Observe the scan tool Cruise parameter while pressing the RES + portion of the cruise control switch. The parameter should display 76 Counts.
- If not the specified value, test or replace the multifunction switch.
- Observe the scan tool Cruise parameter while pressing the SET - portion of the cruise control switch. The parameter should display 148 Counts.
- If not the specified value, test or replace multifunction switch.
- Observe the Cruise Cancel Switch parameter. The parameter should display Inactive.
- If not the specified value, test or replace the steering wheel controls - left.
- If the circuits test normal, test or replace the ECM.
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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.