Transmission Slip Out Of Gear Problems of GMC Acadia

When the vehicle is already in motion, it automatically shifts out of drive and I am left in the middle of the road unable to accelerate for a few seconds until the vehicle automatically shifts back to drive. This happens after pulling out of my gravel driveway which is a slight incline, and onto a highway. The cause is unknown.

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These symptoms started over 2 years ago and is very intermittent. Driving on the highway, the vehicle suddenly loses power, unable to accelerate and the transmission will not shift out of high gear. The decrease in speed is significant enough that on now 3 occasions the vehicle has almost nearly been rear-ended. Additionally, on the instrument panel the following indicators and messages occur: - "check engine light" - "traction control off" - "engine power is reduced" - "service traction control" - "service stabilitrak" additional symptoms: - loss of power steering - loss of power brakes once vehicle is turned off and sits for a few minutes. The vehicle will start and all of the symptoms above will go away with the exception sometimes of the check engine light. This indicator goes off after vehicle has sat overnight. Note this occurs very infrequently. . . Sometimes months in between. August 2018, dealership (chev automation north, denver, CO) diagnosed as transmission problem. Paid $5800 for replacement. October 22, 2018, all of the symptoms described above occurred again while on highway nearly crashing the vehicle. Wife now refuses to drive the car again. This vehicle is totally unsafe. It is unfortunate that a fatal accident must occur before any real attention is made to fixing a problem of this magnitude with gm vehicles.

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Transmission failed, transmission slipped out of gear, transmission stuck in first gear, gm approved a 2013 safety recall for this vehicle, the transmission failed in 2017, the transmission was repaired and the entire engine has been replaced twice. The transmission is failing again because it is a product defect that is dangerous. Gm has refused to repair or replace the vehicle and the autonation has refused to repair or replace the vehicle. Gm and autonation have sold a dangerous used car with a fraudulent intent. Gm and autonation have ratified the intentional fraud. The car needs to be replaced immediately because it is still dangerous to drive and the transmission is currently failing again.

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As I was driving onto the freeway and trying to merge my vehicle had slipped out of gear while it was in drive. I had no acceleration and I was on an incline. Once my vehicle slowed to 20mph it had re engaged and I was able to merge off of the freeway. This created a safety hazard for my girlfriend and I and her 3 young children because the speed limit on the freeway was 65 mph with very limited space to merge because other drivers are trying to merge onto an exit ramp. This created a safety hazard not only for our family but for others trying to merge onto the freeway behind us at a very low speed and those trying to exit at the same time. Luckily for us nobody was hurt. The vehicle is now in the shop and we were told that it is the 3-5-r wave plate. After reading on multiple forums about this vehicle and the transmission issues I believe that GMC needs to be held accountable for the malfunctions in this transmission because it is a safety hazard to those on the road.

While driving down the road, the Acadia would not shift out of first gear.

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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.

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.

While driving the transmission would not shift out of third gear. I am told that a wave plate has failed and the transmission needs to be replaced, cost $3000+.

Going down highway vehicle acted like it slipped out of gear . . About got run over by transfer truck before I could get it to side of road . . . Took to shop said transmission needed replaced . . Apparently like 100s of them do on the Acadia.

My wife was driving her 2008 GMC Acadia on the freeway when the transmission suddenly gave out and slipped out of gear. The vehicle would not accelerate. She was in the fast lane traveling 70 mph in the fast lane. She had to fight through traffic to get over to the shoulder so she could pull off the freeway enough to avoid getting hit by other cars traveling the freeway. She then had to exit the vehicle with our children during high traffic time. Very unsafe situation for a vehicle with only 69k miles on it. This is a known issue with the 2007 and 2008 lambda platform vehicles. GMC knows about the 3-5-r wave plate that was not heat treated during the building of these transmissions. Search the web or even forums for 3-5-r wave plate failure and see what comes up. I feel they should atleast extend the warranty if not recall this transmission before somebody gets hurt or killed when one goes out in traffic.

While driving on the highway, going 60 mph, my car lurched forward and made an awful sound. The car completely slipped out of gear into neutral. The gas would not work. After coasting down a hill we were able to pull over. Thank goodness no one was behind us. We turned off the car and were able to restart it, but the maximum speed was 40 mph-and that was pushing it, the rpms were revved so high. We had called a tow truck.

On a trip from texas to colorado our transmission failed. Driving on Saturday - transmission was acting funny. Stopped for night - got up next day to pull out of parking lot onto highway and transmission slipped out of gear - couldn't get it back into gear - managed to steer to right hand side shoulder. Could have been disastrous if I had made it out onto highway with cross-traffic coming. Looking on edmunds. Com it seems this is a very persistent issue with gm Acadias & Buick enclave gm models.

On occasion, our 2008 Acadia would not shift out of low gear when fist attempting to drive. The tac would rev to 5-6000 rpm at a max of about 20 mph. We would need to pull over, turn off the vehicle, wait a few minutes and restart. At this point everything would be fine with the exception of the check engine light being displayed. At first this would happen very rarely. It then began to happen more frequently. The last incident was very scary for my son, a new drive. He attempted to pull out into heavy traffic on a street with a 50 mph speed limit. The vehicle would only go 20 mph and there was no shoulder for him to pull over. We took it to the dealer and they diagnosed the problem as a failed wave plate. And from what I have been reading, a very common failure. The repair involved a transmission rebuild and cost us $2,800. Gm refused any compensation. Absolutely ridiculous that a company would not stand by an obviously defect issue in its product.

I was driving down the highway on Friday afternoon at 65 mph when I tried to accelerate to pass a vehicle, and the engine just revved nearly to the redline. I was able to reach the exit, where I pulled over, put the car in park, then back into drive to start off again. At this point, the car would not shift out of 1st gear. I was able to make it to a midas shop for a check and they stated that the transmission was shot. Called the local GMC dealer and had the car towed there for a diagnostic. They called Saturday afternoon and confirmed that the transmission needs to be replaced at a cost of $3700. The car is 24k miles under warranty mileage, but just happens to be 5 months outside of the 5 year warranty window. I then called GMC customer care for redress and was told they would investigate. Received a call today ad they left a message, but only to ask which dealership it was at, even though I provided that info on Saturday, to include the phone number to the service department. The transmission problem seems to very widespread based on the number of responses on various websites, but doesn't seem that it is being seriously addressed by gm management and is a very serious safety concern.

The vehicle would not shift out of 2nd gear going down the highway. The check engine light came on, and there are now four codes all for internal transmission issues. The car is 4 months past the 5 year warranty, but only 64000 miles. This is a huge safety issue. If this transmission fails while on an interstate highway, and it will not go over 20 mph, the results could be deadly. By researching this issue I have found a considerable amount of complaints about 2007 GMC Acadias between 50000 and 80000 miles having transmission failures, but yet no recalls. This is an issue that GMC is well aware of, through their own admissions. Why is there such a delay waiting for a recall? are all of the complaints going to have to wait for a fatality before GMC admits there needs to be corrective actions?.

Was going to back out of my garage when I put the shifter into reverse. When the shifter was in reverse, it shifted out of gear on its own into drive and it went forward slamming front end of the vehicle into a refrigerator. Causing the refrigerator to be completely destroyed and the front end of the hood to become crooked. This is very dangerous and concerning as had their been someone in front of the vehicle it would have more than likely seriously hurt them or killed them. I have also had other incidents when driving the vehicle that it will shift from drive to low on its own and this happens frequently at least 3 times per week.

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