The A/C comes on and off automatically and you have no control over it. GM states they did this so you don't have to turn your def. On. while I'm driving I continually have to take my eyes off the road to fiddle with the temp. Control. (the A/C comes on full cold) I've contacted GMC and they refuse to do or offer any help in this matter.

- Indianapolis, IN, USA

On November 8th, 2018 took vehicle into cappellino GMC Buick, for oil change, tire rotation and inspection even tho inspection was not due until December..was told tires on these vehicles were waring unusually fast..notices were posted all over the dealers facility, told we could buy new ones for slightly less than new price because they were pro rated..this 2017 Acadia was leased new, less than one year ago..we believe we should not have to pay for faulty product..at that point called dealer we had purchased from and questioned what was going on..we were told "if it passed inspection, tires should be good for another year." On 11/25/18, while pulling into driveway, the left rear drivers side tire blew out and was flat within a few seconds.. we then called dealer back again and was told to call roadside assistance then bring in asap tp dealer to get new tires. These tires are not safe. On 11/27/18 went into dealer with spare that we were told not to go over 40 miles on. They said they would split price of 4 new tires..we said ok. They then tried to put 4 new faulty tires on vehicle. We refused to purchase more of the bad tires they then gave us the option of buying a different tire that had to be ordered and sent us off with the spare still on car.. we were told it will take at least 3 to 5 days to get the other tires..we have used 20 of the miles just getting back and forth from dealer. We do not feel we should be responsible for faulty equipment on leased vehicle. These tires are not safe..there are children in this car on a daily basis. This weekend we were to be at a hockey tourn. For one of the children, rooms have been booked and he is the teams' goalie. We have no way to get there now. We were not offered a loaner or any kind of help. Had this happened on a highway of any kind there is no telling what may have happened. We hope you will check into this asap

- North Tonawanda, NY, USA

Was found brake fluid in the brake booster vacuum hose and brake booster is leaking from master cylinder and being drawn into the brake booster.

- Bolingbrook, IL, USA

Does not always recognize that it is already in park and will alert me telling me to put it into park. Will not shut off the lights/radio/etc. Because it does not 'think' it's in park when it is. I have researched this and it seems many other Acadia owners have experienced this and had to pay out of pocket for its repair.

- Bella Vista, AR, USA

Attention needed - shift to park message on dic vehicle is in park vehicle won't shut off stays in accessory mode cannot lock vehicle vehicle in stationary mode - happens 20% of times parking

- Hixson, TN, USA

Shift to park stays on when placing my vehicle into park. This does not allow the electronics to shut off indefinitely resulting in a dead battery. GMC has stated that this is not a recall and that because I am out of my warranty this is not covered. After reading multiple forums there are hundred of people with this same issue from 100miles to 60K+ and GM has refused to make this a recall. Someone did state that they got their shift assembly replaced and it fixed the problem. Very disappointed with GM and not standing behind an issue that is clearly a defect from the manufacture. They also are having the same issues with Cadillac stemming form their Tennessee plant. Buyers beware!

- Zumbrota, MN, USA

Vehicle displays "action required - shift to park" in the dashboard information center when the gear shift is put into park and the ignition push button is pushed to turn the vehicle off. The alarm sounds repeatedly and the auxiliary power stays on. If the vehicle is exited alarms sound as if the key fob were left in the vehicle. In addition, the auxiliary power stays on (including the headlights if in auto mode) indefinitely. My dealership is unable to fix this problem for nearly two months and has other customers with the same problem. GMC customer assistance has provided no help.

- Frankenmuth, MI, USA

This issue has happened 3 times now and is becoming a safety concern for my family and I and for others on the road. I purchased the car brand new in May 2017 and the issue occured for the first time on October 02, 2017. Second time was February 15, 2018 and the third time happened around early April 2018. While driving at a slow speed (entering a parking lot, in the middle of an intersection when I was about to make a left turn on a green light, and while driving in a parking lot after getting gas) the car made a grinding/clunking sound and was brought to a very abrupt stop. I tried to press the gas but the car would not move. I changed the gear from drive to park and then drive again and would still not move. I turned the car off and then back on and still nothing. I ended up figuring it out by pressing the parking break button 1-2 times and was then able to proceed to drive. It seems as though something may have triggered the parking brake but while I was in drive and while the vehicle was moving. I was almost rear ended when this happened in the intersection and also during the time I was unable to move in the intersection, my light had changed to yellow and then red and oncoming traffic was honking because they could not go on their green light due to me being stopped in the intersection. It was very scary and dangerous as it almost caused an accident 2 out of the 3 times it has happened. I told service dept at the dealership about it twice. They have "looked into it" one time but since they were not able to replicate the issue (obviously), there is nothing they can do. I am concerned about my families safety if this continues to happen.

- Simi Valley, CA, USA

We bought this vehicle in late January 2018. The car was a new 2017 GMC Acadia. We had the car a few days when my wife said that she could not get the horn to work. She said she looked at the manual and found where to push but nothing. I tried and could not get the horn to work either I called to and made an appointment for the dealer service to look at the car. They informed me that it needed a new contact. Told me they would call when the part comes in. I still haven't head from them and called a couple of time and was told again, we'll call as soon as the part comes in. I believe this is a big safety problem as several time we need the horn and could not get it to work.

- Hudson, NY, USA

Horn is extremely difficult to sound. It takes strong pressure on only one area of the surface to sound. My wife has never been able to do it. Would be almost impossible to sound in an emergency. There are many instances of this issue on line. Attatched is the dealers statement. Both the dealer and GMC rep say it is working as designed. It has been like this since new. (Nov. 2017)

- Canton, OH, USA

Panoramic roof exploded.clear day, no overhead trees wires etc. 2 lane road in nc.

- Chatham, NJ, USA

High horn effort - horn does not activate when pressed on. Driver has been unable to notify other cars coming into their lane. Concerned that they will be unable to avoid an accident. Took delivery of vehicle on 01sep2017 with this as a known issue. Have not had any resolution until vehicle went into service around 09jan18. Bulletin issued to replace wire harness. This new wire harness did not improve the condition at all - may even be worse than before. This is a safety issue - GM needs to address this immediately. This is either due to the driver airbag cushion pack height or wire harness limiting horn travel.

- Shelby Twp, MI, USA

I was driving for approximately 20 miles on a highway with my windshield wipers in the intermittent postion. There was a light snow coming down. The wipers worked up to this time. The driver side windshield wiper stopped working. This affected viability dramatically. It would have been worse with heavier snow. I took it to the dealer and they found the screw had loosened and the wiper motor and windshield wiper were disconnected.

- Barnegat, NJ, USA

Windshield cleaner nozzle sprays too low onto windshield.when trying to clear salt spray wiper just pushes fluid down and does nit clean spray adversely affecting visibility while driving on highway.brought to dealer to have checked, they agreed that there us a problem.said they will check for any bulletins on problem.nozzles are not adjustable and are made of solid plastic. Also checked another Acadia on lot with same results.GMC should fix this problem before ther is an incident.

- Union, NJ, USA

Horn is extremely difficult to depress. So difficult in fact, that most of the time it is inoperable in needed situations. We have reached out to the dealership who informed us to contact GMC who then directed us back to the dealership who sent us back to GMC. After 6 months of no response we were finally told by GMC that the understand it is hard to press but there is nothing they are planning on doing about it at this time. I explained that this is a serious safety issue and we are uncomfortable driving the vehicle.

- Orange, OH, USA

Truck constantly fails to start. Keyfob not recognized. Computer system crashes, rear air vents fall out. Faulty gas tank and gas line. Cannot fill up gas tank past 1/2 a tank. Been happening since inception and is constantly in and out of service for the same issues over the past year. Not being able to start the truck is a safety hazard to me and my family. There needs to be an alternate way to start the truck should the computer system crash.

- Centereach, NY, USA

Very hard pressure needed to activate horn, no matter which point is pressed youd need extreme pressure to activate. Very unsafe unable to blow horn in a emergency

- Forest Hills, NY, USA

The horn is extremely hard to blow (safety hazard ). dealer agrees it is extremely difficult to blow, but comparable to similar models, apparently poorly designed and very unsafe. Should be recalled.

- Foley, AL, USA

Hello, is anyone investigating the horn problem with the 2017 GMC Acadia that is well-documented in many places, including your own NHTSA website" the same problem likely exists with the 2018 models as well. This has been an issue since the '17 models were first introduced in 2016 and GM says they can't fix it. A safety issue and they can't fix it" this vehicle needs to be recalled before someone gets hurt, or worse. GM dealers are still selling these vehicles to uninformed buyers and they will not fix the problem.

- Lewes, DE, USA

The horn on this vehicle requires excessive pressure to operate. I was advised by dealer that they are aware of it, have a bulletin on it, but no repair. This situation could become a danger as horn does not function with normal pressure. This issue has been with the vehicle since delivery. 4/17. This vehicle was just serviced on 9/27

- East Meadow, NY, USA