Medium and Heavy Trucks
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Hi Christopher, My name is***** will be glad to help. What are the complete code numbers you are getting?
Try cruise off key on and hold set/resume until the check engine light begins flashing the 3 digit code. Short pauses between each digit and a longer pause between each code. It will repeat. Let me know
Click on this link for the flash code procedure. If it does not work a scan tool would need to be connected.
That is odd. Possible unrelated but could be temperature related. Do you have access to a scan tool that reads live data or Cummins Insite to be able to check the ECM parameters and historical faults logged?
Are you losing speedo or tach at all indicating a loss of engine speed signal or vehicle speed signal to the ECM?
The only common link between the fan and engine brake is the ECM but the two circuits are unrelated.
Click this link for some troubleshooting help for the engine brake. The rest will need to be accessed with Cummins Insite to monitor switch status, etc.
any Cummins authorized dealer can look this up by your engine serial number. Records of all updates go into a main system for all Cummins authorized service centers to access. Yes it is possible this could be ECM related.