Llgray75 l
New member
I have a 2017 GMC canyon Denali diesel. The truck runs great for about 9 months. For the past 2 weeks I've noticed that when the automatic trans shifts from gear 2 to 3rd. I feel it shift into hear, then the rpm rise quick and then it jolts into gear. Now this doesn't happen every time. I had trans fluid changed. And the mechanic said there was minimal metal in pan. I was doing research and it has hydraulic parts that may be need to be reset using an obd scanner. My theory is that it's not mechanical, because it's not doing every time. So possibly software. But another thought is that it could be the torque converter slipping.....that's my thoughts. Please help and please give suggestions......thank you
