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 MANUALSGMC2009SAVANA G2500, VAN CARGO EXTENDED, 6.6 6REPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESANTI-LOCK BRAKESANTILOCK BRAKE SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC C0035-C0050CIRCUIT/SYSTEM TESTING
2009 GMC Savana G2500, Van Cargo Extended, 6.6 6
Circuit/System Testing
2009 GMC Savana G2500, Van Cargo Extended, 6.6 6SECTION Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the EBCM.
- Ignition ON, test for less than 1 volt between the 12-volt reference circuit terminal of the appropriate sensor listed below and ground:
- LF Sensor circuit terminal 28
- RF Sensor circuit terminal 17
- LR Sensor circuit terminal 4
- RR Sensor circuit terminal 3
- If greater than the specified value, test the 12-volt reference circuit for a short to voltage.
- Test for less than 1 volt between the signal circuit terminal of the appropriate sensor listed below and ground:
- LF Sensor circuit terminal 29
- RF Sensor circuit terminal 6
- LR Sensor circuit terminal 5
- RR Sensor circuit terminal 2
- If greater than the specified value, test the signal circuit for a short to voltage.
- Ignition OFF, test for infinite resistance between the 12-volt reference terminal of the appropriate sensor listed below and ground:
- LF Sensor circuit terminal 28
- RF Sensor circuit terminal 17
- LR Sensor circuit terminal 4
- RR Sensor circuit terminal 3
- If less than the specified value, test the 12-volt reference circuit for a short to ground.
- Test for infinite resistance between the following signal circuit terminal of the appropriate sensor listed below and ground:
- LF Sensor circuit terminal 29
- RF Sensor circuit terminal 6
- LR Sensor circuit terminal 5
- RR Sensor circuit terminal 2
- If less than the specified value, test the signal circuit for a short to ground.
- Ignition OFF, disconnect the harness connector at the appropriate WSS.
- Test for less than 2 ohms between the appropriate 12-volt reference circuit terminals listed below:
- LF Sensor circuit terminals 28 at the EBCM harness connector, and terminal A at the WSS harness connector
- RF Sensor circuit terminals 17 at the EBCM harness connector, and terminal A at the WSS harness connector
- LR Sensor circuit terminals 4 at the EBCM harness connector, and terminal A at the WSS harness connector
- RR Sensor circuit terminals 3 at the EBCM harness connector, and terminal A at the WSS harness connector
- If greater than the specified value, test the 12-volt reference circuit for an open or high resistance.
- Test for less than 2 ohms between the appropriate signal circuit terminals listed below:
- LF Sensor circuit terminals 29 at the EBCM harness connector, and terminal B at the WSS harness connector
- RF Sensor circuit terminals 6 at the EBCM harness connector, and terminal B at the WSS harness connector
- LR Sensor circuit terminals 5 at the EBCM harness connector, and terminal B at the WSS harness connector
- RR Sensor circuit terminals 2 at the EBCM harness connector, and terminal B at the WSS harness connector
- If greater than the specified value, test the signal circuit for an open or high resistance.
- If all circuits test normal, replace the appropriate wheel speed sensor. If the DTC resets 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.