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 117 (HYDRAULIC BRAKE SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESBRAKE WARNING INDICATOR MALFUNCTIONCIRCUIT/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 is about a different car, the 2008 Chevrolet Malibu Classic. However, it is still accessible from the selected car via links, so may be relevant.
Park Brake Switch Malfunction
- Ignition OFF, disconnect the harness connector at the park brake switch.
- Test for infinite resistance between the park brake switch terminal and ground with the park brake released.
- If not the specified value, replace the park brake switch.
- Apply the park brake, test for less than 1 ohm between the park brake switch terminal and ground.
- If greater than the specified range, replace the park brake switch.
- Ignition ON, verify the scan tool BCM Park Brake Switch parameter is Inactive.
- If not the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the BCM.
- Install a 3A fused jumper wire between the signal circuit terminal A and ground. Verify the scan tool BCM Park Brake Switch parameter is Active.
- If not the specified value, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the BCM.
- If all circuits test normal, test or replace the park brake switch.
Brake Fluid Level Switch Malfunction
- Ignition OFF, disconnect the harness connector at the brake fluid level switch.
- Test for less than 1.0 ohm of resistance between the ground circuit terminal B and ground.
- If greater than the specified range, test the ground circuit for an open/high resistance.
- Ignition ON, verify the scan tool IPC Brake Fluid parameter is OK.
- If not the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the BCM.
- Install a 3A fused jumper wire between the signal circuit terminal A and the ground terminal B. Verify the scan tool BCM Brake Fluid parameter is Low.
- If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
- If all the circuits test normal, test or replace the brake fluid level 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.