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 CARGO EXTENDED, 4.8 CREPAIR AND DIAGNOSISBRAKESANTI-LOCK BRAKE SYSTEM, TRACTION CONTROL SYSTEM & STABILITY CONTROL SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC C0045 OR C0050CIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G3500, Van Cargo Extended, 4.8 C
Circuit/System Testing
2008 Chevrolet Chevy Express G3500, Van Cargo Extended, 4.8 CSECTION Circuit/System Testing
IMPORTANT:
It is recommended that Component Testing is performed before Circuit Testing when diagnosing wheel speed sensors because the module will default and does not supply voltage to the sensor when the DTC is set.
Performing Circuit Testing with EBCM connector disconnected and key on will cause U codes to set. Clear DTCs after performing the test.
Performing Circuit Testing with EBCM connector disconnected and key on will cause U codes to set. Clear DTCs after performing the test.
- Ignition OFF, disconnect the harness connector at the EBCM.
- Ignition ON, test for 0 volts between the low reference circuit terminals of the appropriate sensor listed below and ground.
- LR Sensor circuit terminal B
- RR Sensor circuit terminal B
- If not the specified value, test the low reference circuit for a short to voltage. If the circuit tests normal, replace the EBCM.
- Test for 0 volts between the signal circuit terminals of the appropriate sensor listed below and ground.
- LR Sensor circuit terminal A
- RR Sensor circuit terminal A
- If not the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the EBCM.
- Ignition OFF, test for infinite resistance between the low reference terminals of the appropriate sensor listed below and ground.
- LR Sensor circuit terminal B
- RR Sensor circuit terminal B
- If not the specified value, test the low reference circuit for a short to ground. If the circuit tests normal, test or replace the wheel speed sensor.
- Test for infinite resistance between the following signal circuit terminals of the appropriate sensor listed below and ground.
- LR Sensor circuit terminal A
- RR Sensor circuit terminal A
- If not the specified value, test the signal circuit for a short to ground. If the circuit tests normal, test or replace the wheel speed sensor.
- If all circuits 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.