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 MANUALSCHEVROLET2000CHEVY EXPRESS G3500, VAN PASSENGER, 7.4 JREPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESTRACTION CONTROLANTI-LOCK BRAKE SYSTEM - 4WALDIAGNOSTIC TESTSDTC C0235, DTC C0236, DTC C0237: REAR SPEED SENSOR SIGNAL CIRCUIT OPEN
2000 Chevrolet Chevy Express G3500, Van Passenger, 7.4 J
DTC C0235, DTC C0236, DTC C0237: Rear Speed Sensor Signal Circuit Open
2000 Chevrolet Chevy Express G3500, Van Passenger, 7.4 JSECTION DTC C0235, DTC C0236, DTC C0237: Rear Speed Sensor Signal Circuit Open
- Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK under DIAGNOSIS & TESTING. After performing diagnostic system check, go to next step.
- Using scan tool, clear DTC(s). Operate vehicle at speeds greater than 12 MPH with brakes released or 20 MPH with brakes applied. Recheck DTCs. If DTC resets, go to next step. If DTC does not reset, problem is intermittent.
- Raise and support vehicle. Turn ignition off. Disconnect EBCM harness connector. Set DVOM on DC voltage scale. Connect DVOM between chassis ground and vehicle speed signal circuit at EBCM harness connector. Place transmission in Neutral. Turn ignition on. Manually spin wheels as fast as possible. Ensure driveshaft is rotating. Observe DVOM. If voltage reading is 5-7 volts, go to step 5 . If voltage reading is not 5-7 volts, go to next step.
- Check vehicle speed signal circuit for short to voltage. Repair as necessary. After repairs, go to step 9 . If circuit is okay, go to step 7 .
- Check for poor connections at EBCM harness connector. Repair as necessary. After repairs, go to step 9 . If connections are okay, go to next step.
- Replace EBCM and perform tire size calibration procedure using scan tool. After replacing EBCM, go to step 9 .
- Check for poor connections at PCM/VCM harness connector. Repair as necessary After repairs, go to step 9 . If connections are okay, go to next step.
- Replace PCM/VCM. After replacing module, go to next step.
- Turn ignition on. Using scan tool, recheck DTCs. If DTC resets, go to step 2 . If DTC does not reset, system is okay.
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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.