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 MANUALSCHEVROLET2001CHEVY EXPRESS G3500, VAN PASSENGER EXTENDED, 6.5 FREPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESTRACTION CONTROLANTI-LOCK BRAKE SYSTEM - 4WALDIAGNOSTIC TESTSDTC C0238: WHEEL SPEED MISMATCH
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 F
DTC C0238: Wheel Speed Mismatch
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 FSECTION DTC C0238: Wheel Speed Mismatch
- Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK under DIAGNOSIS & TESTING. After performing diagnostic system check, go to next step.
- Check vehicle's front tires for equal size. If tire sizes are the same, go to next step. If tire sizes are not the same, replace tires.
- Check vehicle's rear tires for equal size. If tire sizes are the same, go to next step. If tire sizes are not the same, replace tires.
- Using scan tool, verify that EBCM and PCM/VCM both have the correct tire size calibration. Using scan tool, perform calibration procedure. After calibrating tire size, go to next step. If calibration was not necessary, check for very low tire pressure, incorrect or damaged wheel speed sensor.
- Using scan tool, clear DTCs. Road test vehicle for about 2 miles at speeds greater than 15 MPH but less than 50 MPH. 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.