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I am also having an intermittent issue with the service electronic throttle control light coming on. When in temps above 50 degrees it isn't an issue, but when in 30's or less, it comes on once and a while when stopped at a stoplight. I don't have my foot on both the brake and accelerator and not towing. I don't notice the truck running rough or anything either. The light goes out a couple seconds later. Now, with that said, the last couple of months i have experienced an increase in rpm's while towing, but after coming to a stop. This has happened once not long after towing a boat to storage and twice while towing my 5th wheel. Each time my rpm's would go from about 1500 to 2000 while i have my foot on the brake. I would tap the accelerator to try and get the r's to decrease but they would increase with each tap and hold steady. Recently, while stopped in heavy traffic, the rpm's went up to 3000. I put truck in park and shut it off. After a minute i restarted and it was fine.
I have since made it down to Florida and haven't had an issue with the light, or rpm's since. Don't know if this is the same problem you are having, but it seems to me the throttle control may need replaced? I have a 2013 Ram 2500. Anyone experience this before?