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HOMESERVICE MANUALSBUICK2000CENTURY CUSTOMREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLANTI-LOCK BRAKE SYSTEM WITH TRACTION CONTROL SYSTEM - DELPHI 7DIAGNOSTIC TESTSDTC C1254: ABNORMAL SHUTDOWN DETECTED
2000 Buick Century Custom

DTC C1254: Abnormal Shutdown Detected

2000 Buick Century CustomSECTION DTC C1254: Abnormal Shutdown Detected
  1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK  under DIAGNOSIS & TESTING. After performing diagnostic system check, go to next step.
  2. Turn ignition off. Disconnect EBCM harness connector. Install Universal Breakout Box (J 39700) using the Cable Adapter (J 39700-99) to EBCM harness connector only. Check module ground circuit for open. If circuit is open, go to step  8 . If circuit is okay, go to next step.
  3. Check if battery been disconnected recently. If battery has been disconnected, go to step  8 . If battery has not been disconnected, go to next step.
  4. Check charging system. See appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS article. Repair as necessary. After repairs, go to step  8 . If charging system is okay, go to next step.
  5. Check for poor connections or terminal tension at EBCM harness connector. Repair as necessary. After repairs, go to step  8 . If connections or terminal tension are okay, go to next step.
  6. Using scan tool, clear DTCs. Ensure ABS/TCS conditions are normal. Recheck DTCs. If DTC resets, go to next step. If DTC does not reset, problem is intermittent. See INTERMITTENTS & POOR CONNECTIONS  under DIAGNOSIS & TESTING.
  7. Replace EBCM. After replacing EBCM, go to next step.
  8. Using scan tool, clear DTCs. Ensure ABS/TCS conditions are normal. 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.