I have a camper van with a Cummins diesel engine. I used a 6 pin J1708 connector as I have an old RV (2001). My "warning light" came on a few minutes after starting, but goes off every time I stop and restart the engine. Anyway, it's happening again. I tried reviewing the code with the 'Warn' light off and looking for a story as to why it was lighting up, but this code reader didn't see any codes so I tried reading the code with the 'Warn' indicator turned on read the ad, but this code reader still couldn't read the code.
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