Transmission went out (wave plate) which caused the engine to rev. Up. because of this I now have to have the engine rebuilt as well. I see that there are a lot of issues with the transmission from searching online. Why hasn't GM recalled this and made it right.

- New Carlisle, OH, USA

2008 GMC Acadia. This year/model has had a lot of issues with the wave plate & transmission. The truck was brought in with 58K miles and had the transmission replaced in 2011. This past week, the transmission has started to malfunction again. Same symptoms from 2011 when the transmission needed to be replaced. The car delays as it goes in and out of gears. The car now has 98K miles and will need to have the 2nd transmission repaired (3rd transmission in car if you count the one it came with). The vehicle is less than 6 years old. Looking at repairs, the cost will be over $3500. Lots of owners are running into these issues with the 2007/2008 Acadia models. I don't understand how GM is not doing a recall on these vehicles to address the root issue.

- Charlotte, NC, USA

Steering locks up. When you take off from a stop sign or traffic light and want to make a right or left turn the steering will lock up to a point where you can't turn. There had been several occasions that I was almost in an accident. Replaced rack and pinion 3 times and power steering. Water pumps are defective, replaced 2 before 100,000 miles transmission went out at 73,000 miles. Every issue that is stated above the dealer didn't want to replace under warranty, even after contacting GM. It took a lot of fighting with GM to replace the transmission when there was known problems with these transmissions being faulty.

- Kennewick, WA, USA

Transmission went out car slowed to 10 mph.

- Wheaton, IL, USA

Well a lot happened with this car. First the power steering pump went out. Then the lifters had to be replaced at 54000 miles. Then at 104000 miles the lifters are back making the same noise that it made the last time I took it to shop.the transmissions went out at 108000. Got it replace. But the heads are still rattling. Then there is the electric problem my windows want go up or down most of the time they said the motors or still good in them. They said that it need electric work that's why my gauges go crazy sometimes. Then there are the struts and shocks that went out at 60000 miles. Ever since I put my car in the shop at peilter Chevrolet in lufkin Texas I have had nothing but trouble. They fix a recall in the tire area on my car, and I think it wasn't done right. They didn't put my tire guards all the way back on its missing screws. They said that's the way it was I told them it wasn't hanging down when they got it. Then when the replace my heads and I picked up my car. The black guard pieces that goes under the hood had screw setting on it. The where not put back in it. Then there was a 2 bigger screw and the didn't know what they went to. I had more thing wrong when I got my car back from them then when I carried it to them. I researched GMC Acadia and I realized that a lot of people had the same thing like lifters replacement, transmission replacement at around 90000 miles to 110000 miles, problems with there struts and shocks. Power steering and much more. What I cant figure out is why hasn't there been recall on the transmission and heads or lifters, if everybody is having this much trouble out of these parts on the 2008 Acadia's. we all pay good money for these vehicle's and to have this much trouble out of them there not worth what we pay for them we are getting cheated out of our hard earned money. That's the way I feel about it.

- Pineland, TX, USA

While driving the transmission did not engage into the next gear and the engine RPM's went very high for a short time and the transmission finally engaged the next gear very roughly. I immediately stopped an placed the vehicle in park. I then placed the vehicle in drive and began to accelerate when the vehicle missed the same gear again. I stopped the vehicle and placed I took the vehicle to a local mechanic who stated that the transmission would have to be rebuilt or replaced. He informed me that this is a major issue with this vehicle and that I should research it on the internet where you can find thousands of the same issue from owners of the same vehicle. The problem that GMC is aware of is a defective wave plate in the transmission that fails, causing the issue. This should be recognized as a defect and GMC should be held accountable.

- Islip, NY, USA

The contact owns a 2008 GMC Acadia. While driving approximately 65 mph, the vehicle failed to respond when the brake pedal was depressed. The vehicle stalled and did not restart. The vehicle was towed to a dealer. The technician stated that the transmission needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the issue. The failure mileage was 129,000.

- Christiana , TN, USA

The contact owns a 2008 GMC Acadia. The contact stated that while driving approximately 45 mph, the vehicle stalled without warning. The vehicle was towed to the dealer. The technician diagnosed that the water pump had failed. The vehicle was repaired.in addition, the contact stated that the transmission failed and she was not able to exceeded more than 10 mph. The dealer repaired the fuel kit, housing, sensor and cover. However, the failure recurred. The manufacturer was aware of the issue. The approximate failure mileage was 28,000.

- Cathedral City, CA, USA

I have had to replace a transmission on a car with just over 55000 miles. The windows leak when sitting outside in the rain. The power steering locks up when you drive thru a puddle. The braking system makes some god awful noise when going on or off a ramp. This was our very first brand new off the line car. Really wish we had waited until the bugs were worked out.

- Danville, IL, USA

My wife was driving down the highway with our kids when the transmission suddenly slipped. The engine revved up and then dropped into the next gear. The next time she came to a stop the car wouldn't shift into third or fifth gear. It will not go into reverse either. There are no "service engine" lights on. The service garage said she was lucky it didn't happen in heavy traffic. This seems to be a very common problem with these GM vehicles. GM will do nothing because it's out of warranty. This is obviously a defect in manufacturing.

- Coleranie , MN, USA

Driving my family to grandparents house for the weekend to visit.the trans started to rev between gears and then just quit.no forward or reverse just nothing.now big bill to fix for an issue that GM knows they have.I'm not going to ramble on because a lot of people with same issue had spent a lot of time writing novels of what has happen to them.simply will be put this way.tranny stopped working, GM knows of issue and they should pay to fix.

- Mukwonago, WI, USA

Complete transmission failure due to 3-5 wave plate failure. The consumer has an issue with the head restraints in the new Acadia's. he stated the eight passenger vehicle only offers four adult head restraints. Updated 06/03/15.

- Berkeley, CA, USA

My GMC Acadia 2008 constantly stalls on me the issues started August 5 and has continue up to last night August 17th. While I'm driving the car would shut off on me and the check engine light would appear. I wont be able to restart the car so I had the car towed to the nearest GMC dealer. After paying for a diagnostic report the mechanic told me they could not find any codes indication the check engine light even came on. Last night I was scared because I left work at midnight after driving about 10 minutes the car started jumping then turned off and the check engine light came on in the middle of the street. I called on-star and they were dispatching a tow truck because the car would not come on. After 45 minutes I tried to turn the car on and it came on so I cancelled the tow truck service. This is a issue that's been happening for the last 2 weeks. I cant get the issued fixed because the last 2 diagnostic reports that were ran states no issues. I also had on-star run a diagnostic report right when the issue happened and they also told me they don't see any issues. I took a picture with my cell phone when the check engine light came on but no one seems to know the issues the SUV is facing. Everything stays on the radio the lights just the car shuts off and wont start for like 45 minutes to an hour. I've looked on different GMC Acadia forums and it seems I'm not the only person having this issue with this same make model and year car. Someone on the forum suggested I make a compliant at the ntsa.

- Bronx , NY, USA

The contact owns a 2008 GMC Acadia. While driving approximately 60 mph, the vehicle lost power and the transmission gears failed. The contact stated that the transmission gears intermittently slipped. The vehicle was towed to an independent mechanic who stated that the waveguide needed to be replaced and the transmission needed to be rebuilt. The vehicle was not repaired. The approximate failure mileage was 133,000.

- Winston Salem, NC, USA

While driving my 2008 GMC Acadia on the highway, the car started shifting hard, jumping, slipping, etc. This caused a very dangerous situation as this could have potentially caused an accident. I was able to get to a parking lot and then my car would not go in reverse, so it had to be pushed into the parking space. The 3-5-reverse wave plate is broken and will need to be replaced. After doing some research on the internet I have found that this is a major problem with 2007-2009 GMC Acadias, not to mention several other GM vehicles with the same transmission also have this issue. If there are that many vehicles having the same issue, this proves there is a major defect with this part and GM should be held responsible for this. This problem created an unsafe driving experience for myself and my family while on a busy highway that potentially could have caused a serious accident. Please do something about this and hold GM accountable for their defective part.

- Easton, PA, USA

Vehicle seemed to have dropped out of gear, so I pulled off highway into parking area. I realized vehicle wouldn't move when in reverse. After pushing the car backwards so I could turn around (in said parking lot) I pulled back out on highway. Vehicle would not accelerate over 40 mph and tach was doubled at over 4. I did make it home and I had vehicle towed to transmission shop where it is now being diagnosed.

- Wilmington, NC, USA

The contact owns a 2008 GMC Acadia. The contact stated while driving 45 mph the transmission failed. The check engine light illuminated on the instrument panel. The contact engaged the accelerator pedal and the vehicle did not move forward. The vehicle was driven onto a parking lot and placed in reverse gear; however, the vehicle did not move. The vehicle was turned off, restarted and the failure recurred. The vehicle was placed in neutral gear and pushed from the front end however, the vehicle was driven to her home and later towed to a private mechanic. There was no diagnostic test performed nor was the vehicle repaired. The failure mileage was 60,084.

- Wilimngton, NC, USA

The contact owns a 2008 GMC Acadia. While driving approximately 40 mph, the vehicle failed to respond when the accelerator pedal was depressed. The vehicle was towed to the dealer where the transmission was replaced. The manufacturer was notified. The approximate failure mileage was 83,700.

- Florence, SC, USA

The vehicle refused to shift out of first gear and the check engine light became illuminated upon pulling out into the roadway. At 25 miles per hour the rpms were 4000 and it just would not shift. We pulled over, called for help and were stranded on the side of the road with two small children. We were hours away from home, and had to call family from hundreds of miles away to come help. The vehicle after being turned off and sitting for a while did then return to normal operation when restarted. Vehicle was driven home and two days later the very same problem recurred. Going to trade in this pos before someone gets hurt.

- Wyoming, PA, USA

2008 Acadia purchased in 2007, transmission intermittently slamming into gear for high speed up and down shift. On dry pavement the SUV will change several mph well within a second. My concern is that this is potentially dangerous while driving in inclement weather. Especially on snow/ice! I am taking the SUV to the dealer on Monday for a diagnosis. I suspected an internal clutch problem or valve control problem couple of weeks ago. The problem is progressively getting worse. After reading online I found that this is a common problem with this series of transmissions starting after 47K. I wanted to add my concern. My car just passed 63,000 miles. I truly believe this is a potential safety hazard. Several things would have to happen at once (ie let off the accelerator, accelerate, brake, and be on wet or ice roads). The shift is intermittently hard during any of these changes in acceleration causing a potentially dangerous condition.

- Vista, CA, USA