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i have a 2001 Monaco motorhome Cummins engine dash warning light an i cant communicate with ecm i have checked wire schematic 03 wire at dash plugm16 is the warning light just shows it as engine warning checked powers and grounds at dlc any ideas on diag for no communication

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Posted (edited)

Is the engine running ok, and just a warning light?   Sometimes low coolant can turn the light on.  I have had mine come on when coming down a mountain,  I guess my  RPMs were getting a little to high.   My light would stay on until I turned the key off and started again then it always went off.

I don't believe it ever threw a code though.

Edited by Ray Davis
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There should be an engine diagnostic switch on the dash (at least there is in our 2003 Endeavor / ISC) and a procedure on how to use it in the Cummins manual (maybe Dynasty manual also).  Count the flashes. 

- bob

 

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Mine has been on steady for 3 years. The worse part is occasionally it does not come on. Had it into the shop twice for way more money than I should have spent seeing as they never found the problem. I have about given up. If you ever figure it out please advise us. 

 

Thanks Ken

 

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  • 3 weeks later...

We had the low coolant light come on sporadically - a Cummins mechanic fixed the issue by cleaning the electrode that goes into the reservoir.  Reached in with a file and cleaned off the electrode from the filler hole.  Warning light is gone.

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