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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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