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Hello, my name is Joe
If the engine light came on, then there should have been some fault codes and data stored in the ecm.
Not all fault codes will show up in the instrument cluster. The Cummins software is the only way to see all fault code data.
Could you reply with a list of fault codes that the Cummins dealer had cleared?
I apologize for the late response, there is a glitch in the notification system.
There are many possible fault codes associated with the egr and turbo actuator.
Fault 1896 is a fairly common egr valve fault with the CM2150 , but it normally activates at initial engine start-up.
I could speculate that the engine coolant temperature may be climbing into the warning range, but this too should set an information fault code in the ecm.
All I can suggest would be to run the coach again until the alarm event repeats. Then at a Cummins service center, demand that they provide a printout of ALL fault codes.
If you can reply back to me with the exact fault codes, we should be able to get a good idea of whats happening.
Just checking in to see if you need any clarification on something which I stated above. Please remember to rate my service, so I can receive credit for my help. -Joe