I would bring it in, it seems a sensor is off and not throwing it as an error. If you have a reader I would anticipate a code from your exhaust brake or trailer brake controller. Sorry to hear about your issues please let us know what you/they find!
I have 34k miles on mine and it still does it, annoys the ever loving piss out me! I toggle the tow/haul switch on and off real fast and it shuts that crap off until I use the brake again of course.Just found this thread but I guess I'll resurrect it since I am a new owner and also find this feature a little annoying. I don't mind the breaking too much but I do find it hard to get it to come out of brake mode. I think that as soon as I touch the gas, it should recognize I don't want any more braking and automatically upshift. But, I have to touch the gas a couple times usually and then let off the gas to get it to upshift. I understand and appreciate what it's trying to do for me but I don't care for the way it takes control from me. My Toyo Taco had a similar feature that was much more subtle - the downshifting would help some to control the speed but it was nowhere near as severe and noticeable as the Colorado.
It might, DeeK. I could see it picking up something like that when it was brand new and still in fast learn. Now, I don't know how long a time/ miles that fast learn stays activated, but being that early in the life of the truck, I could see it learning that if you had a heavy trailer on it and went a long distance. Getting a dealer to reset it to start fresh very well may help you out.Hills of Kentucky. Mine does it too. I'm curious if a tune would take it out
A tune should yes, Pergrem. I mean, back to the fast/ slow learn on the ECM and TCM like I mentioned above; when I tuned my 2004 Duramax from DuramaxTuner, it told me in the directions that after installing the new tunes on the truck, the ECM and TCM would be in a state of fast learn, so you were to drive the truck in each of the 5 tune modes (optimized stock, light tow, heavy tow, sport economy and race and I believe you did NOT turn tow/ haul on during this) at like 2/3 throttle for a couple minutes each to get it used to each one, then you could put it on whatever mode you wanted and drive the vehicle as you normally would.Hills of Kentucky. Mine does it too. I'm curious if a tune would take it out