Transmission wave plate issues....the car shifts into different gears and about caused an accident. Took it to a mechanic and it is a transmission wave plate that needs replaced. Going to cost us around $4000. Just spent 1000 dollars to fix the power seats that quit working also.

- Lincoln , NE, USA

The transmission again is going out on it for the 3rd time. This last time there was snow on the road and when it kicks down because of the wave plate failing again this time I was going around a corner and it kicked down and made me slide off the road I was able to get out and almost hitting the guard rail

- Colorado Springs, CO, USA

I purchased the GMC Acadia from a dealership in kaiserslautern germany in May 2012. By April 2013 the transmission completely stopped working. At first the SUV would jump gears 6-3 sometimes 6-1 while moving at speeds higher than 35 mph. I have 3 young children and the result of such sudden shifting could have caused whiplash and did cause fear. I took the vehicle to auto schneider in weiden germany who identified the speed sensor as the problem via the computer and replaced the part. By 10 May 2013 the vehicle was completely immobile. I conducted research and have found over 1000 entries specifying that people have had to replace the transmission around 70000 miles, and sometimes twice, with GMC covering 0 costs. As a us service member I believe that the NHTSA should monitor complaints on other sites and investigate poor mechanics especially when tax dollars were used to rehabilitate GMC in 2008. Anytime there is a mechanical failure in a vehicle's transmission it can cause incident.

- Apo, AE, USA

Transmission went out on turnpike. Causing family to miss a family members college graduation. Car was stuck on side of turnpike for 3 hours with little kids in car while high speed vehicles drive by. When I took car to mechanic for repair they had identical problems with another Acadia. This car is very dangerous and expensive for families.

- Drumright , OK, USA

My GMC Acadia had the transmission fail and it will cost me $4000 to put a new one in. I am finding out that this is a common occurance in the Acadia at fairly low milage.

- San Diego, CA, USA

While driving car bucked and shifted irregularly, transmission slipped, no power, no reverse.

- Aquebogue, NY, USA

My 2008 Acadia transmission failed as I exited a highway (70 mph) and was going up the exit ramp. It began bucking like a horse. Once I pulled over and parked, I could not go in reverse. The car had to be towed and a new transmission had to be put in it after only 56K miles. Also have had the sunroof / moon roof trays overflow because the drainage tubes are not large enough to drain all the water from the trays. The dealership stated it was a poor design and nothing could be done to replace it. Now water has entered my vehicle causing the electrical box to become wet causing the horn to blow randomly and the car to continue running after turning it off and removing the key.

- Greenville, NC, USA

Driving the vehicle that had 7 people. I turned onto a street in town and the vehicle started shaking like the transmission was slipping. So I turned to head to the nearest parking lot. Stopped at a stop sign and again the vehicle shook from a take off. Didn't even make it into the driveway before the transmission completely failed in the middle of the busy intersection and we had to push it into the parking lot.

- Bath, MI, USA

While traveling a busy highway going uphill, my transmission began to have what felt like slipping clutch issues, and finally failed - leaving me stranded on a very busy stretch of highway 80 East bound. It was very scary to be just barely off the roadway (was lucky to make it all the way off the road) with huge trucks whizzing by. I have had it diagnosed and the clutch waveplates on these Acadia gmcs have a well known and common failure issue. A $3500 bill is not what I need right now, it's going to really hurt. This transmission needs to be recalled before someone gets killed on a busy freeway. The problem is there was not much warning of an eminent failure before it basically left me dead in the water - I was just fortunate this time that I was traveling in the right lane. If I had been in the left lane or middle, I am not sure I would have been able to get over before it would just leave me in the middle of the road. It's definitely a safety issue. Who could make an argument that it is not unsafe?

- Roseville, CA, USA

The contact owns a 2008 GMC Acadia. The contact stated that while traveling various speeds, the vehicle suddenly stalled. The vehicle was taken to the dealer where it was found that the clutch had failed. The vehicle was being repaired. The manufacturer was contacted about the failure. The failure mileage was approximately 100,000. The VIN was unavailable. Updated 5/27/14

- Hamden, CT, USA

Transmission originally started skipping around 75,900 miles. At 100,000 miles started system alert of " transmission running hot, idle to cool down". transmission serviced on 11/11/13. Transmission drained and refilled by GMC dealer in el paso, tx. Ran ok until 2/06/14. In GMC repair shop in richmond, ca. Transmission completely failed! $4000 repair.

- Hercules, CA, USA

TL- the contact owns a 2008 GMC Acadia. While traveling about 30 mph, the contact stated that the vehicle failed to increase speed despite the accelerator pedal being depressed. The vehicle was taken to an independent mechanic for inspection. The contact was informed that the transmission needed to be rebuilt or replaced. The vehicle was not repaired. The manufacturer was made aware of the issue. The approximate failure mileage was 94,000.-

- Cumming, GA, USA

Engine light came on took it in to get checked the GMC dealer said it was purge valve and may be my timing chain belt! and my master cylinder was leaking into my booster, and they had to replace a sensor for the tire and service the track/stabilitrak! services came to $1000 now come 2 months later to Jan 2014 engine light is on service stabilitrak is on take it back, my timing chain needs replaced@ 74000 miles which is about a $2000 job and my transmission platelets need changed! transmission is now slipping we called GM and there is nothing they will do as I was informed these are "command problems " in these vehicles!! what!! I feel like I've been sold a lemon and no one are GM cares because these are command problems for them! never again will I buy a GM and I'm confused on how so many people have these same issues and GM is doing nothing about it! oh did I mention you can't park on a slant or an incline with a 1/4 tank of gas because your Acadia won't start! this car has been a nightmare!

- Valparaiso, IN, USA

Wife driving along and transmission dropped out. Car is vary well taken care of. In 5 years and ten months of owning the vehicle the tranny goes? car only has 49000 miles, and apparently there is a none problem with the tranny. Vehicle repairs cost 4000, completely unacceptable. Code on vehicle wasp0776.00, just like every other complaint I have seen on the internet. Something must be done. Would not recommend this car to anyone. My father is a GM employee and he is disgusted with this.

- Niagara Falls, NY, USA

Warning indicators turn on for the system braking components such as ABS brake failure, traction control and loss of engine power while accelerating between 35 to 50 miles per hour. Engine power decrease and the car speed and power is decreased with the loss of engine power warning. The car would just stop at this point. I contacted onstar each time this issue occurred to a diagnostic scan and each report indicated that same warning reported on the console. After 10 minutes the vehicle would re-start and I was able to drive it. This issue has re-occurred within 2 years and the GMC service department was unable to diagnose the problem but during the latest incident the mechanic had ruled the issue as low brake fluid. I've investigated this issue online on various blog forums for the GMC Acadia with the same description of braking system failure and others report the failure as an internal braking malfunction in which the master cylinder leaks into the brake booster. I'm concerned that this problem could potential become fatal is it recurs. The GMC service department refuse to look into my concern and investigate the problem. There are no visible signs of a leak because the leak is internal.

- Pflugerville , TX, USA

Transmission started failing and finally went out at 108,000 miles, sitting in our driveway and we had to have it towed to dealer. GM dealer replaced it under warranty but the labor cost us several thousand dollars. Now at 170,000 miles, this remanufactured transmission is now going out. It sticks in low speed and then overheats driving 65mph in 40deg weather. The dealer claims that a stretched timing chain has to be fixed first, before the transmission, at a cost of $1944. They also said the on board computer didn't store the numerous overheated transmission events that began occurring immediately after the remanufactured transmission was installed at 108,000 miles. The GM dealer is trying to tell me that the transmission is probably ok and that the overheating is due to some other reason, but he then couldn't even guess at what the other reasons might be! the fluid level is good, and the vehicle has a tow package with a cooler for the transmission fluid. GM dealer said the transmission will be covered by warranty, which will likely mean another several thousand dollar labor charge on top of the so called stretched timing chain cost of $1,900. The power steering pump has been whining for about a year and is getting loud. The navigation and dvd player system failed twice. Might be time to trade the vehicle for something more reliable. My wife is getting scared to drive it too far and end up being broken down in atlanta traffic...very dangerous.

- Milton, GA, USA

After exiting the interstate while driving my 2008 GMC Acadia, I stopped at the end of exit ramp and while trying to accelerate, I lost power and unable to reach posted speed limits. The car lost power and had to be towed to a GMC dealership and was told that the 3-5 wave plate failed and caused further damage to the transmission. The dealership stated that no signs of operator abuse were observed and it appeared that the wave plate failed on its own. The costs of repair was approx. $4700 since the car was out warranty by 8 months and had 60,400 miles. I have called GMC customer service and waiting for resolution on my claim that my costs to repair should be mitigated since it appears that the wave plate failure was a design or manufacturing issue.

- Cheshire, CT, USA

I have experienced multiple issues with my 2008 GMC Acadia my first problem was with the transmission having to be replaced. Which just barely was covered under the warranty I had after buying the vehicle used since that first incident I have had continual problems. My engine will stay running after the key is turned to the off position and the key is removed from the ignition the car continues to stay running the engine does that is all other lights go off no radio or ac stay on. I have had it in the shop different times no one can correctly diagnose and fix the issue. I am now watching the tow truck hook my car up to be taken to the GMC dealer which is going to cost more than I am sure I can afford to pay as a single mother trying to make ends meet. So besides the engine running with no key in it. It also kills the battery drains it when it sits. I have also had issues with the wiring harnesses to the head lights melting to the back if the bulbs having to be replaced costing over $200. There has to be some kind of electrical issue with this car there seem to be many people on here with similar issues with transmission and odd issues. Please help I can't afford this car and the continual issues.

- Leesburg, GA, USA

The contact owns a 2008 GMC Acadia. The contact stated that while traveling various speeds, the vehicle failed to accelerate over 20 mph. The stabilitrac and several other warning lights illuminated. Additionally, the vehicle shook violently. The vehicle was taken to the dealer where the failure could not be diagnosed. The manufacturer was not contacted about the failure. The failure mileage was 92,000. The VIN was unavailable.

- Mivland, TX, USA

I had started noticing slipping of the transmission, this primarily occurred when reversing and then when trying to gain speed like on the on ramp trying to get on the highway. I made an appointment to have it looked it with our local mechanic who preceded to tell me they could find nothing wrong and to bring it back if the check engine light came on that way they could hook it up and get the code. I had an upcoming trip out of state and prayed the vehicle would make it and it did. I continued to notice the slipping of the transmission and approximately 2 weeks later I was driving in town, going about 35 mph and my check engine light popped on. I parked the vehicle and dropped my daughter at daycare, got back in the car to leave and the vehicle would not go into reverse or move forward. I had to have the vehicle towed to the dealership where I was informed it was a problem in the transmission with a broken wave plate and 3-5 reverse clutch plate. My vehicle was out of warranty by time however still under the mileage so I was offered the repair at a "discounted" rate. I then researched to find out what a common problem this has been with this vehicle.

- Chapman, KS, USA