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 42 (ANTILOCK BRAKE SYSTEM, TRACTION CONTROL SYSTEM & STABILITY CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC C0299CIRCUIT/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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IMPORTANT:
It is recommend that Component Testing is performed before Circuit Testing when diagnosing the power brake booster actuator.
- Ignition OFF, disconnect the 2 way harness connector at the power brake booster actuator.
- Test for less than 25.0 ohm of resistance between the ground circuit terminal 5 and ground.
- If greater than 25.0 ohm, test the ground circuit for an open/high resistance.
- Connect a test lamp between the control circuit terminal 1 and the ground circuit terminal 5.
- Command the Active Brake Booster to ON and OFF with a scan tool.
- If the test lamp remains OFF during the commands, test for a short to ground or an open/high resistance on either control circuit. If the circuits test normal, replace the EBCM.
- If the test lamp is always ON, test the control circuits for a short to battery positive. If the circuit tests normal, replace the electronic brake control module (EBCM).
- If all circuits test normal, test or replace the vacuum brake booster 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.