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 DIAGNOSIS (SINGLE PAGE)BRAKESANTI-LOCK BRAKE SYSTEM, TRACTION CONTROL SYSTEM & STABILITY CONTROL SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC C0455CIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Circuit/System Testing
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Circuit/System Testing
- Ignition OFF, disconnect the harness connector X200 at the Steering Wheel Position Sensor.
- Test for less than 1.0 ohm of resistance between the low reference circuit terminal 24 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 volts between the 5-volt reference circuit terminal E10 and ground.
- If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM.
- Test for 4.8-5.2 volts between the 5-volt reference circuit terminal E10 and the signal circuit terminal D5.
- If less than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the EBCM.
- Ignition OFF, reconnect the Steering Wheel Position Sensor.
- Disconnect the EBCM harness connector.
- Test for infinite resistance between the signal circuit terminal D5 and ground.
- If less than the specified range, test the signal circuit for a short to ground.
- Disconnect the Steering Wheel Position Sensor.
- Reconnect the EBCM harness connector.
- Ignition ON, test voltage of phase A, phase B, and phase C. verify that the reading is battery positive voltage for each of the three phases.
- If not the specified value, test the phase A, phase B, and phase C circuits for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM.
- Ignition OFF, reconnect the Steering Wheel Position Sensor. Turn the ignition ON. Using the scan tool, rotate the steering wheel and observe the Steering Wheel Position Sensor. Verify the sensor sweeps through the entire range while monitoring the steering wheel as it rotates in degrees from the input signals between circuit phase A and the signal circuit phase B. The rotation in degrees should vary between phase A and phase B without any spikes or dropouts.
- If not within the specified range or is erratic, replace the Steering Wheel Position Sensor.
- If the sensor test normal, replace the EBCM.
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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.