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 941 (SUSPENSION CONTROL SYSTEM - SUSPENSION LEVELING)DIAGNOSTIC INFORMATION AND PROCEDURESDTC C0711CIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Circuit/System Testing
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- Verify that there are no air leaks in the system.
- If a leak is found, repair or replace the leaking component as necessary.
- Ignition OFF, remove the ESC/ALC EXH Fuse in the underhood fuse block.
- Disconnect the air pressure sensor and test for less than 2.0 ohms between the low reference terminal F at the harness connector and ground.
- If greater than specified, test the low reference circuit for open/high resistance. If the circuit tests normal, replace the electronic suspension control module.
- Reinstall the ESC/ALC EXH Fuse in the underhood fuse block.
- Ignition ON, verify that 4.75-5.25 volts exists between the 5 volt reference circuit terminal H of the harness connector and ground.
- If less that the specified range, test the 5 volt reference circuit for open/high resistance or a short to ground. If the circuit tests normal, replace the electronic suspension control module.
- If greater that the specified range, test the 5 volt reference circuit for a short to voltage. If the circuit tests normal, replace the electronic suspension control module.
- Ignition OFF, disconnect the electronic suspension control module connector.
- Test the pressure sensor signal circuit for a short to ground, open/high resistance, or short to voltage.
- If all circuits test normal, test or replace the sensor/filter assembly.
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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.