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On my unit, a Holiday Rambler Endeavor, Cummins DP, the ATC light kept coming on. After ignoring it for some time, the engine lost power like it was missing out. Long story short, the secondary fuel was clogged and needed changing due to algae growth. (Engine misfire will cause the ATC light to activate even before you can detect the miss from the drivers seat). In fact, after adding chemicals to kill the algae growth, the filter had to be changed several times. Now it runs fine. I would recommend you don't ignore this too long. I would service both fuel filters before doing anything else. It is a cheap fix compared to having a shop diagnose this for you. At least buy spare fuel filters and carry with you just in case. Don't forget the appropriate fuel filter wrenches. This is something you can do on the side of the road if you have too in an emergency, but it would be much better to have this done before roadside repairs are necessary. If you search the forums related to your unit, you should find information regarding fuel filters and ATC light. Hope this helps or at least points you in the right direction.
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Phil and Katie
2000 Prevost Marathon
2014 Honda CRV
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Atc light on.... Why? Help....
Linear Mode
