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DTC C0281: Stoplight Switch Circuit

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2001 GMC Savana Special, 2001 GMC Savana Camper Special, 2001 GMC Savana, 2001 Chevrolet Chevy Express, and 2000 GMC Savana Special. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK  under DIAGNOSIS & TESTING. After performing diagnostic system check, go to next step.
  2. 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 .
  3. 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.
  4. 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 .
  5. 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.
  6. 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 .
  7. 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.
  8. 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 .
  9. 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 .
  10. Replace EBCM and perform tire size calibration using scan tool. After replacing EBCM, go to step  12 .
  11. Replace stoplight switch. After replacing switch, go to next step.
  12. 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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