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So I haven't been on the thread for awhile but wanted to share this just in case.
Quick background, I ordered my Colorado about a year ago. Model WT with a V6. Wanted the extra power but all the other stuff didn't matter to me as this was just a daily for me.
Loved the truck when I purchased it then found out quickly about the ECU/TMC shifting issue was present. Look around on forums to see if anyone else had the same issue. Found out right away I wasn't the only one with the problem.
After looking through this thread I heard of a Firmware update that should take care of it. Went to the dealer and talk to my rep and found the ticket regarding the flash.
So they performed the flash, picked up the truck and it felt great. Well a few days later the truck started to fall back to it original configuration and the shifting issue was back.
Over the pass few months I learned to live with it. Using manual mode when I couldn't handle and auto when I would cruise.
Well here's the reason I'm posting again. A few days ago I thought about using the Tow Mode to see if it had any effect on the shifting. Thinking that if it changes the pattern during Towing it might feel different.
4 days later I can say it makes the Truck feel completely different. Shifting when its supposed to. Up shift, down shift, you name it the Truck doesn't even seem it ever had an issue.
If anyone is looking for a quick fix I would try what I'm saying. I really can't believe it's working after dealing with this issue for almost a year. Unbelievable.
I have noticed about 1 less MPG but for the difference in the shifting I'll deal with that any day of the week.
Again try Tow Mode to correct the shifting issue. You might never think something this simple worked.
Dam
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