Cummins

2678

UnclassifiedGeneral

What This Code Means

Battery charging alternator is not functioning correctly or is sensing too high of external battery voltage

Possible Causes

  • •Faulty Engine DC Alternator
  • •Open Circuit

Suggested Actions

  1. 1Check the wiring of the alternator for open circuits.
  2. 2If the appropriate output is not observed, replace the DC alternator.
  3. 3Measure the output voltage of the alternator to the battery while the engine is running.

Related Cummins Fault Codes

281428152677281626622892266128932624289626232942
Browse all Cummins fault codes

ASK RUDY ABOUT THIS FAULT

Get a diagnosis walkthrough for 2678 on your specific Cummins unit — cited to the OEM manual, not a forum guess.

GET THE ANSWER

Free account required — we'll bring your question with you.