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I towed a 4600# travel trailer back from San Diego to Seattle via the coast in a 2011 Hemi V8. In Northern CA, I had forgotten to engage Tow/Haul mode after a fuel stop and at the top of a grade got a Check Engine light. Pulled over and used DiagFCA to find the light was for trans over-temp…cleared code and it never came back.

Moral of the story: use Tow/Haul mode when towing. Don’t worry about the RPM.
 
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