My2008 Enclave accelerates nicely. when it reaches the speed at which the transmission switches to the next gear (20-30 mph) the car shakes and vibrates and the rpms fall.

Asked by GuruT1G2K Jul 05, 2018 at 10:42 AM about the 2008 Buick Enclave CX FWD

Question type: Maintenance & Repair

my 2008 Enclave accelerates nicely. when it reaches the speed at which the
transmission switches to next level, the car shakes and vibrates and the rpms
fall. then giving it gas to the 40-50 mph and it happens again.

10 Answers

100

Our vehicle does the same thing. Did you ever find someone who was able to properly diagnos and fix?

6 people found this helpful.
70

I also have a 2008 Buick Enclave and when I reach 40 and then when it hits 50 and then 60 nobody can seem to find the problem I got the throttle changed prior to this happening

2 people found this helpful.
100

We were told it may be related to a motor mount which needed replacement but this didn’t resolve the issue either so still a problem

4 people found this helpful.
20

our 2008 started doing this not too long ago, at first i thought it was maybe a missfire. Being a mechanic i hooked it up to a computer and checked to see if anything would throw a code. turns out that the input sensor from the engine to the transmission was going bad. i though to myself, thank goodness i dont have to replace the transmission. so i changed it, and it helped the problem slightly, still a slight shutter. so doing more digging i found that these transmissions have a bad habbit of going out, and that it is only a matter of time before i have to put a new one in it. its a common problem in the 2008 - 2010 models. sure i could just put about 3k into a new one and keep it, but something you should alsoknow is that at around 130000k miles the timing chains will eventually mess up. i am looking to get rid of mine now to avoid future problems. hope something from this was helpful

2 people found this helpful.

All the above is true. 2008's were the worst. GM did a lot of warranty work on these units. I believed they replaced the wave plates or something like that. The repair is 3G$ as the mechanics have to remove the old trannny, repair it and then re-install. A lot of labour hrs. I have a 2009 with 222,000 km's.I nurse mine through the 5th and 6th overdrive gear and it is still working OK for me.

I had this same issue. In the past I had a throttle body issue and a good cleaning helped it. Now, it is doing it again. I just got a new transmission and I have little confidence that it was done correctly since the mechanic had it for over a year, he cross threaded my axel, cut my wheel speed sensors and said he drove it over 100 miles. Yet, the minute I got on the interstate, it my car jersey to the middle lane from the on ramp. I am in the process of trying to figure out if the shudder/sputtering/slight loss of power is related to my car sitting for over a year or other unrelated issues. Ironically, it acts just like it did when I cleaned the throttle body and it was fixed.

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