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Author Topic: Transmission Problem - 2007 Acadia  (Read 3597 times, 5 Replies)
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« on: December 01, 2007, 10:42:33 AM »

Our Acadia has 7000 miles and we have had several small issues to complain about, but we have kept them quiet because we love the vehicle. We took the Acadia in 18 DAYS AGO, because we were having transmission problems where reverse wouldn't engage (unless we shut it off and pulled forward a little) and we also began to experience random shifting at different speeds. We still do not have the Acadia back and to make matters they gave us a Pontiac Grand Prix as a rental. The Grand Prix is NOT a car fit for a family, not sure how they thought the Grand Prix was an equal car.

Can anyone tell us if they are aware of major transmission problems with the Acadia or what we should do. We are at the point of not wanting to ever buy a GMC again, especially since we have had to constantly call for updates on the vehicle and all we get is "we are waiting for parts." We were originally promised it would be fixed in less than a week.
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« Reply #1 on: December 01, 2007, 02:16:00 PM »


From what I've read on this site, the Acadia had a software problem with the transmission where it would hesitate to shift or shift into too high of a gear too early.  To fix this, owners had to get their transmission software updated.  This might be the problem with your car - you may want to check with the dealer if they updated the transmission software.  If they did, perhaps they messed up the software upgrade and need to redo it.  From what I understand this problem has been fixed with the software update.

However, the not shifting into reverse may be a solenoid or something, as this is an electronic transmission.  You may want to do a search on this site.

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« Reply #2 on: July 17, 2009, 12:35:56 PM »

I too am having a transmission problem of a similar kind. My 2007 Acadia with about 22,000 miles recently started not engaging in reverse. I found it to be most prevelant when the car had been driven for some time , was shut off and was either parked  on an incline or decline.  I would start the vehicle, place it in reverse and accelerate..either the car would not move or would rev and then slam into gear.  A corresponding issue was hard shifting into different gears and an occassional reving on the highway when cruising.  Recently,the same problem of not engaging has shown up even when parked on a flat surface. The dealer said that the computer shows no signs of anything wrong...big surprise there.  If anyone else is having this problem, can you please let me know what the fix was.
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« Reply #3 on: July 17, 2009, 02:25:29 PM »

Welcome to the forum. As we usually ask, it is helpful to list your vehicle's specifications in your signature (see Blues Clues on how to do this). Do you know if the transmission has ever been reprogrammed (also known as a flash)? If you do some more research (search for transmission flash) here, you may find relevant info. The member that started this thread was here for 7 days in 2007 and never came back, so I doubt you will hear from them.

Life lesson: The two best days owning an Acadia are the day you buy it and the day you sell it. Our $42K Acadia lasted less than 6 years and began to fall apart: radio, hatch, water pump, power steering, TPMS, and now the transmission all within a year.
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« Reply #4 on: July 17, 2009, 04:20:30 PM »

... a transmission problem ... place it in reverse and accelerate..either the car would not move or would rev and then slam into gear.  ... the computer shows no signs of anything wrong...

Is this another case of mechanical failure that is not detected by any sensor?  I wish some of these mechanics would get their head out of their USB port and look somewhere else besides the display screen! Bang Head Help blob

2007 Acadia SLT-2, HiYo Silver/Titanium, no NAV, no HUD, no errors - SLT-2 Club #2 (I try harder), Silver Club #4
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« Reply #5 on: July 17, 2009, 04:52:01 PM »

I wish some of these mechanics would get their head out of their USB port


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