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 G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 932 (SUSPENSION CONTROL SYSTEM - SUSPENSION DAMPING)DIAGNOSTIC INFORMATION AND PROCEDURESDTC C0696CIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Circuit/System Testing
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Circuit/System Testing
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- Ignition OFF, disconnect the harness connector at all 4 suspension position sensors and the automatic level control (ALC) compressor.
- Ignition ON, test for 4.75-5.25 volts between the 5 volt reference circuit terminal and ground at each sensor connector.
- If less than the specified range, test the 5 volt reference circuit for a short to ground or an open/high resistance. If all circuits test normal, replace the ESC module.
- If greater than the specified range, test the 5 volt reference circuit for a short to voltage. If the circuit tests normal, replace the ESC module.
- Reinstall each connector, one at a time, while verifying for 4.75-5.25 volts between the 5 volt reference circuit terminal and ground of the last connector to be connected.
- If the voltage is out of the range when one of the 4 connectors are connected, test or replace the suspect suspension component.
- Replace the last remaining suspect suspension component.
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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.