Possible transmission issue??? 2015 TRD

Since we're on the topic of 2015 issues...in cold weather, say under 25F my RSCA light is on but dim. When I press the RSCA button the light gets brighter and the TPS light also comes on. I have a video I can upload to youtube if that helps.

I showed the stealer and they wanted me to make an appointment because they had no idea why this is happening. However the weather here in RI isn't as cold anymore.

 

At least there's a consensus that the compressor seems to be the culprit. Thank you.
I haven't done any towing...nor have I checked the fluids in the last 2 weeks.

 

I don't know if your truck has slip joint in driveshaft or at the transfer case, but years ago I had a chevy truck that had that bump at a stop and it turned out to be slip joint was sticking at the splines so that when you came to stop the rear end would wind up then the sticky spline would unstick causing bump. The fix was to lube spline either at transfer case, or splines in drive line and this took care of problem.

 

I remember that TSB like it was yesterday . The spline grease they used was very expensive . About the size of a can of pop and it was $60 bucks .
There was enough spline grease in the can to do approx 5 trucks . Gotta look up the name of the lubricant GM used . I will see if I can find the part number and edit this post . That lube worked wonders for clunks

 

$19 Ford XG8 Genuine Ford Fluid XG-8 PTFE Lubricant - 3 oz.

Ford XG8 grease is the unofficial fix for a sticky slipjoint.

 

I didn't run the defrost/floor mix after all your answers. I had no issues with any bump at stops all weekend. Thank you!

 

mt truck does this to and it has for awhile no idea what it is any updates?

 

I normally ran the defrost setting all the time, when I stopped running that setting the truck no longer bumped when stopped. I believe the members were correct that it is the compressor kicking on.