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 DIAGNOSISBRAKESTRACTION CONTROLANTI-LOCK BRAKE SYSTEM - 4WALDIAGNOSTIC TESTSDTC C0281: STOPLIGHT SWITCH CIRCUIT
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 F
DTC C0281: Stoplight Switch Circuit
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 FSECTION DTC C0281: Stoplight Switch Circuit
- Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK under DIAGNOSIS & TESTING. After performing diagnostic system check, go to next step.
- Turn ignition on, with engine off. Using scan tool, observe brake switch status parameter. If scan tool displays OFF, go to next step. If scan tool does not display OFF, go to step 5 .
- Apply brakes. Using scan tool, observe brake switch status parameter. If scan tool displays ON, problem is intermittent. If scan tool does not display ON, go to next step.
- Turn ignition off. Disconnect stoplight switch connector. Turn ignition on, with engine off. Using scan tool, observe brake switch status parameter. If scan tool displays ON, go to step 9 . If scan tool does not display ON, go to step 7 .
- Turn ignition off. Disconnect stoplight switch connector. Connect a fused jumper wire between stoplight switch harness connector ignition 3 and TCC brake switch signal circuit. Turn ignition on. Using scan tool, observe brake switch status. If scan tool displays OFF, go to step 9 . If scan tool does not display OFF, go to next step.
- Check ignition 3 voltage circuit and TCC brake switch signal circuit for open or short to ground. Repair as necessary. After repairs, go to step 12 . If circuit is okay, go to step 8 .
- Check TCC brake switch signal circuit for short to voltage. Repair as necessary. After repairs, go to step 12 . If circuit is okay, go to next step.
- Check for poor connections at EBCM harness connector. Repair as necessary. After repairs, go to step 12 . If connections are okay, go to step 10 .
- Check for poor connections at stoplight switch harness connector. Repair as necessary. After repairs, go to step 12 . If connections are okay, go to step 11 .
- Replace EBCM and perform tire size calibration using scan tool. After replacing EBCM, go to step 12 .
- Replace stoplight switch. After replacing switch, go to next step.
- Using scan tool, clear DTCs. Recheck for 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.