Eric J

Ok so the problem has gotten even worse even after warmed completely up the hesitation is bad.Trying to maintain 55 was bad had to either do 52 or 60 mph. The transmission snap is still there when shifting into 3rd . The transmission fluid flush did nothing even 2k miles later. Opened case with ohio attorney general's office and GM sent them false documents saying I didn't have duplication but the attorney general's office had the paperwork in hand. And now have started a lemon law last week.....

Finally found a dealership that would do anything, 4 cases with gm opened and closed . They just did the triple flush and relearn almost 200 miles ago and it did nothing. The only way to fix this seems to be to file a lemon law, GM reps put in for a buy back, they keep saying they haven't got a response back that was before Christmas!! I now have just about 5k miles and this will be the last GM vheicle I will ever own..... GM is total trash and a class action suite needs to be brought againt them . Never ever again will I support GM .My 2 young kids notice when its acting stupid they now say that GM is junk and everytime it acts up my 7 year old says dad I'll never buy a GM when I grow up...

Update , yes like said by others my issue is cold engine (set over night or a shift at work) some what lethargic while picking up speed then maintain speed of 25-30, 27 mph the worst 2-3 shift area it would buck- hesitate until 1\4 way warmed up... Have not gotten the trans flush done yet because we had a cold spell here in Ohio teens in the am and 40 degrees in afternoon and the truck had a cold start idle of only around 900 rpm and the hesitation was gone truck was perfect!!!!! ...Normally when it was hot out it would start at 1300 rpm and slowly idle down. Well the last 2 days it's been above 50 degrees out and the hesitation is back until truck is 1\4 way warmed up and the idle is back up to around 1300 rpm with cold start!!!! Currently have 2,955 miles on the truck ....What the Heck is going on with this truck?

Update I have been going back and forth with my dealer and GM about this issue. GM finally called me back today and said the dealer agreed to do the triple flush as the TSB#pip5504a calls for. I really hope this helps the hesitation, and it's not some bad sensor on the engine because the rep at GM said that if it doesn't then it will just be chalked up as a characteristic of this transmission which is crap. One thing I have noticed is that when the weather was warmer the engine would idle high at first start like normal and slowly idle down . But now here in Ohio it's been around freezing in the am and the truck doesn't start out high it's more like around 900 rpm and idles down faster which you would think that would be the opposite in colder weather right? And if doesn't seem as intense of a hesitation.....

Hello I have a 2018 GMC Sierra with 1500 miles on it and have the fish bite hesitation with light throttle sine 200 miles ,in the mornings and after sitting while I'm at work so basically when engine is cold, also when backing out of my drive way while engine is cold it will surge and rpms rev causing the truck to lunge hard . Dealers say they cannot duplicate but it's a every day thing !! I'm sure they say this because they are well aware of it . They even looked up the tsb where the 2017 did this . The loaner trucks I had while they had my truck also did this. Once it's a 1/4 way warmed up it's totally gone . Has anyone found a fix I'm thinking after the last 3 GM vehicle experiences I've had ...I'll roll the dice on the other brands . I'm sick thinking I just paid 40k on a truck that does this .