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Discussion Starter · #1 ·
I have a 2010 RS auto transm with 46500 miles.

Hope to get some help here as the dealership keeps scratching their heads. After traveling at a speed of 75+ for about 35 miles on the turnpike, when get off at me exit, the transmission will not engage after stopping at the next stop light. It will try to engage, then I hear a big thump and the RPM will rise but not MPH. After letting the car rest for 30 minutes, it will work fine. This has happened twice on the exact same route. The dealership has no clue because a engine light does not go on.

Any feedback will be appreciated.
 

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Auto transmissions are complex, esp. the computer controlled variety.

Guessing isn't the way to go.

Have the dealership contact GM. They've got the engineers to figure this out.
 

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If mine was doing that, and I had tried like you did to resove the issue and it was not fixed the first time.....then I would look for another dealership. I would only return to the same dealer IF their work was guaranteed, fixed at no cost if they failed the first time.
 
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