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.
2008 Chevrolet Chevy Express G2500, Van Cargo Extended, 6.0 KFACTORY OEM SERVICE PROCEDURE
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the steering wheel position sensor.
- Ignition OFF, test for less than 1.0 ohm between the EBCM low reference circuit terminals 11 and 28 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 31 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.
- If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the EBCM.
- Verify the scan tool Digital SWPS Phase A and Phase B minimum value is less then Low.
- If greater than the specified range, test the EBCM signal circuit terminal 6 for a short to voltage. If the circuit tests normal, replace the EBCM.
- Install a 3A fused jumper wire between the signal circuit terminal 6 and the 5-volt reference circuit terminal 31. Verify the scan tool SWPS Signal A is greater than 5-volts.
- If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM.
- If all circuits test normal, test or replace the Steering Wheel Speed Position Sensor.
Factory Service Tools
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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.
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