While driving the vehicle which only has 68,000 miles the reduced engine power warning light appeared. As quickly as was safe the car was pulled to the shoulder. It was towed to the dealer who states the Vacuum pump seized causing the camshaft phase actuator locating pin to spin. Originally they stated a new camshaft and vacuum pump were needed at $3,500, but now state the entire engine is damaged and must be replaced at cost of $12,000. The vehicle was well serviced and this manufacturing flaw lead to the vehicle be stopped on the road putting both the occupants and others around at risk.

- Ontario, CA, USA

There is an has been an issue with my electrical system says I purchased this car in 2017. Myself believe that the issues have not been documented until 2020. When my racy begins to run out, my engine light has been coming on and I-??ve been getting the same code P1101 I took my vehicle to GMC and they told me that the engine light came on because the tape came loose. I brought this vehicle and there-??s no way there should be no tape on it. The service tech also told me that if the problem continue to bring it back and I will have to pay $120 or whatever the label rate was for them to research I contacted GMC to file a complaint and I received the whole bunch of calls from a guy named Kevin. I believe he told me that he had been contacting mike haggerty and no one returned his call and that he was sorry he couldn-??t help me. This is my report number one of them from GMC. sr:9-6167743153. Everywhere I take my car they tell me that they have a lot of customers with the same issue and they tried to replace what the code is matching which is the mass airflow sensor but that does not help there is some type of problem with the engine or the electrical system with this vehicle. I am not the only consumer that has had this problem. I don-??t know what to do. I have two kids I cannot afford to keep pay and label rate for them not to find the problem. I am also attaching the typical email that GMC sent out when they are working with the dealerships because I have been in contact with them and the person that was calling and then they sent me this email.

- Chicago, IL, USA

Car is losing go power when accelerating on to interstate. It-??s like the transmission loses power, the d illuminates, and then it kicks in to drive. It puts us at risk for an accident and I had a semi almost hit me because of this. This has been reproduced at the mechanic shop as well. No warnings before this happens

- Knoxville, TN, USA

My vehicle put itself in park in the middle of an intersection while waiting to make a left turn in the middle of rush hour traffic. The car could not even be placed in neutral to be pushed out of the way of oncoming traffic. Narrowly avoided a collision.

- Meridian, ID, USA

The vacuum pump started leaking and the car was parked immediately. When The pump was pulled out to be replaced, the reason for the leak was identified. The vacuum pump had busted into small pieces which are now in the engine.

- Point Pleasant , WV, USA

Transmission failed. Unable to purchase a replacement as there are no available transmissions for this year terrian.

- Loveland , CO, USA

My husband and son were involved in an almost fatal accident on 07/08/23 in our 2018 Terrain. My husband described that the vehicle spontaneously veered to the right uncontrollably, he was unable to steer to correct the vehicle, unable to brake, they went airborne, hit several poles and a transformer, rolled and flipped several times. All the airbags deployed.After the accident, I found a recall notice from back in 2017, I believe, regarding the drive train. My husband was extricated from the vehicle. My son wasble to cut the seatbelt and crawl out the window. From what my husband explained (he was the driver), this sounds like what they experienced during the collision. I never received a recall letter from GM as this is something I would of taken care of and have got repaired. Please see the photos and the recall I found. Please let me know if there is anyone else I need to contact regarsing this collision.My car was almost paid off. My husband and son could of lost their life. Please advise. Thank you!

- Elkhart, IN, USA

While driving in the rain at about 25-30 mph I noticed a loss of propulsion and before I could turn off the main road the vehicle came to a rolling stop and would not recognize any gears. causing us to block the roadway and had to have it towed home. Took to local car dealer they said it RDCCM abnormal errors like u0422-00 and brake control module errors. Further diagnostics were need to figure out the cause and it possible that the Transmision is having problems now! This should be recalled.

- Plattsburg, MO, USA

When driving the car at low speeds, or right after having been stopped for a few moments. Upon, acceleration, the car will sometimes go into a limp mode. On the DIC, will be displayed a warning about how the car will have the speed reduced after 175 miles and to check the emissions system. The speed has already been reduced at that point. Also displayed maybe a warning about how the power has been reduced. USUALLY, if I turn off the car and wait about a minute, I can restart the car and drive at a normal highway speed again. But not always. The warning on the DIC, will usually turn off if the car does return to normal speeds after about 5 - 10 miles. However, the check engine light may still stay on for several days. This problem can be a daily occurrence. I've had the car in the shop several times, and they have been unable to fix the problem. The car can be unpredictably unsafe, when speed is instantly reduced to 30 mph!

- Corpus Christi, TX, USA

The contact owns a 2018 GMC Terrain. The contact stated while driving at various speeds, the brakes became inoperable. While the vehicle was in park(P), the gear shifter inadvertently shifted into an unintended gear. The brake assist warning light was flashing. The vehicle was taken to the local dealer where it was diagnosed that the vacuum pump and brake booster needed to be replaced. The vehicle was repaired four times but the failure persisted. The manufacturer was contacted and informed the contact to take the vehicle to a local dealer if the failure recurred. There was no additional assistance provided. The approximate failure mileage was 131,000.

- Marblehead, MA, USA

I have a 2018 GMC TERRAIN which I bought brand new from General Motors. In May 2022, the vehicle started jerking/hoping and trying to stall when the speed gets to 55 miles per hour or higher. I have taken it to the dealership on three different occasions for repair and I still have this issue. General Motors engineers were involved in every step of the repairs. They just do not know what is going on with the car or fix it and they are too stubborn. The dealership told me today that they cannot do anything else to the car. They also said they had a code from the engine last week and General Motors said they do not know what that code means. They are forcing me to accept/drive the car in this unsafe condition. I have contacted them multiple times and they do not care.

- Toledo, OH, USA

When you're sitting at idle in gear and go to accelerate the transmission will slip out of gear into neutral then into gear after the rpms climb. This happens alot. According to the dealership this is normal based on information from a bulletin from GMC.

- Tallahassee, FL, USA

11/24/2021 buy 2018 GMC Terrain, before leaving the dealership I told the seller that the engine light was on he said it was because they removed the alarm which I didn-€™t want to buy and the light was going to be off later and told me to take the car to service on Monday 11/29 so my husband took the car they repair a detail on the handle door and he said the engine light it-€™s off so we tough what he said about the alarma, we trust the seller but on 12/26/2021 I left California to Texas, I was about 4 and a half hours away the car began to lose speed and a very strange noise was heard, I stepped on the accelerator and did not raise speed, I had to step aside the freeway and the car turn on but It did not go forward or backward and NO warning light was on dashboard, nothin ! The car broke down in Arizona in the middle of nowhere, it-€™s was freezing and almost got hit by a semi truck, it was a very frustrated experience.

- Perris, CA, USA

The turbine shaft in the transmission broke without warning. The part could have failed in an intersection leaving the vehicle in the middle of the road and potentially causing an accident as the vehicle was unable to move under its own power. Luckily it failed going down the interstate and my wife was able to safely coast to the shoulder. Yes, the vehicle was disassembled by the dealer and the broken part discovered. There was no warning that this would happen. The ironic part was that the vehicle was in to the dealer the day before for a emissions recall, a check engine light (emissions related) and a routine maintenance front end alignment and left my wife stranded the next day.

- Washington, IL, USA

My auto started leaking some kind of oil.not sure what kind but I can see accumulation on driveway concrete pad. Had motor oil & filter changed in case it was a O-ring or not tight enough. It continues to leak.

- Goliad, TX, USA

My 2018 GMC Terrain sle has 41668 miles and has been serviced as needed. Anyhow, sometimes when I am driving, I can feel the power train stall out when driving intermittently. This concerns me as a single parent with a 10 year old child that goes everywhere with me. I just want my vehicle to be safe.

- Apopka, FL, USA

The contact owns a 2018 GMC Terrain. The contact stated that while driving at various speeds, the vehicle stalled intermittently with the check engine warning light illuminated. The contact had taken the vehicle to hillsdale Buick GMC (99 w carleton rd, M-99, hillsdale, mi 49242) on multiple occasions to have multiple repairs performed on the vehicle including the replacement of the ECM, several fuel injectors, and multiple computer updates performed however, the failure persisted after each visit. The manufacturer was notified of the failure and referred the contact to NHTSA for assistance. The vehicle was not repaired. The failure mileage was approximately 90,000.

- Camden, MI, USA

The car keeps revving and doesn't shift into gear. You have to lift your foot off the gas pedal and give it a few seconds and them press it again. However when you press the gas again the car jumps into gear causing the steering wheel to jerk either left or right. It either revs too high or it feels like it downshifts. This last time, 9/8/20, I just reversed out of my driveway onto my residential street, going about 18 mph when the car would not shift into 2nd gear. When it jerked into gear it jerked the steering wheel and it caused me to hit a parked car just 4 doors down from my house, causing $6000 worth of damage to my Terrain likely totaling the 2010 corolla I hit. I have had a clean driving record for 30 years until now. GMC will not own fault and now my insurance will go up as well for something that really was not my fault.

- Abington, PA, USA

The contact owns a 2018 GMC Terrain. On several occasions, while attempting to accelerate from a stop sign, the vehicle stalled. The vehicle would restart after several minutes and the check engine warning indicator illuminated. The vehicle was taken to tasca Buick (510 E nasa blvd, melbourne, fl 32901, (321) 247-7124) where it was diagnosed that the transmission needed to be replaced; however, the part was on backorder. The manufacturer was not contacted. The failure mileage was 10,000.

- Melbourne, FL, USA

Was leaving a parking spot. Vehicle reversed fine, put it in drive and it began to jerk and did not accelerate properly. Made it to the next aisle to park it and get out of way. Once parked, shut off vehicle. Started it. Reversed it and it would only rev up, did not reverse. Put it in drive and it jerked forward, hard and kept jerking as I pulled forward. Parked it again and turned it off. Called dealership, who called a tow service to tow it to them. Attempted to show tow guy the issue at his request, upon his arrival, put it in reverse and it revved up briefly then jerked into reverse. Had to move vehicle to clear area to get it on the tow truck so I put it in drive and it began to jerk constantly and barely accelerating as I drove and felt and sounded like it was going to shut off (but didn't) before I made it to where I could park again. Luckily I was in a parking lot and not on the road. I've had this vehicle exactly a month. Very scary.

- Bells, TN, USA