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 767 (HYDRAULIC BRAKE SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC C1100CIRCUIT/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 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
If only DTC C1100 is set refer to Only DTC C1100 Set, if both DTC C0710 and C1100 are set, refer to Both DTC C0710 and C1100 Set.
Only DTC C1100 Set
- Ignition OFF, disconnect the harness connector at the brake booster vacuum sensor.
- Wait for 60 seconds, test for less than 11 Ξ© between the low reference circuit terminal 2 and ground.
- If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the EBCM.
- Ignition ON, test for 4.8 - 5.2 V between the 5 V reference circuit terminal 3 and ground.
- If less than the specified range, test the 5 V reference circuit for an open/high resistance. If the circuit tests normal, replace the replace the EBCM.
- If greater than the specified range, test the 5 V reference circuit for a short to B+. If the circuit tests normal, replace the EBCM.
- Test for 4.8 - 5.2 V between the 5 V reference circuit terminal 3 and the signal circuit terminal 1.
- If less than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the EBCM.
- If greater than the specified range, test the signal circuit for a short to B+. If the circuit tests normal, replace the EBCM.
- Ignition OFF, disconnect the harness connector at the EBCM.
- Test for infinite resistance between the signal circuit terminal 1 and ground.
- If not the specified value, test the signal circuit for a short to ground.
- If all circuits test normal, test or replace the brake booster vacuum sensor.
Both DTC C0710 and C1100 Set
- Ignition OFF, disconnect the harness connector at the brake booster vacuum sensor and the steering angle sensor.
- Ignition ON, test for 4.8 - 5.2 V between the 5 V reference circuit terminals listed below and ground.
- Terminal 3 at the brake booster vacuum sensor
- Terminal 1 at the steering angle sensor
- If less than the specified range, test both 5 V reference circuits for a short to ground. If the circuit tests normal, replace the EBCM.
- If greater than the specified range, test both 5 V reference circuits for a short to voltage. If the circuits test normal, replace the EBCM.
- If all circuits test normal, test or replace the brake booster vacuum sensor or steering angle sensor as required.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.