2019 GMC Terrain Problems

While driving my 2019 GMC Terrain on local roads, the vehicle suffered a sudden and complete failure of the braking system. The brake pedal became extremely hard to press, and the dashboard displayed a critical error message stating 'Engine Power is Reduced.' during this frightening safety incident i felt lucky to bring the car to a stop without an accident. The vehicle had to be flatbed towed to a repair facility. This sudden loss of power braking is a known, documented defect matching the engine-driven brake vacuum pump failures currently subject to federal class-action litigation (Thieme v. General Motors). I am requesting a formal safety investigation into why the GMC Terrain was excluded from previous GM vacuum pump recalls despite posing an identical, life-threatening risk to occupants."

The contact owns a 2019 GMC Terrain. The contact stated that while stopped and attempting to turn to exit a highway ramp, he observed a loud banging noise emanating from the engine compartment. An "engine reduced power" message appeared. The vehicle then went into limp mode, and when the brake pedal was depressed, it was stiff as a rock. The vehicle coasted while he continued attempting to depress the brake pedal, and it eventually slowed down. The vehicle was steered to the side of the road and turned off. When the vehicle was turned back on and he attempted to depress the accelerator pedal, the vehicle did not accelerate. The vehicle was taken to his mother's residence approximately 100 miles away in limp mode and parked. The vehicle was not diagnosed or repaired. The contact stated that his brother, during an inspection of the vehicle, removed the vacuum pump and noticed that it was broken with numerous pieces that had gone into the engine. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was approximately 76,000.

While driving my 2019 GMC Terrain on local roads, the vehicle suffered a sudden and complete failure of the braking system. The brake pedal became extremely hard to press, and the dashboard displayed a critical error message stating 'Engine Power is Reduced.' during this frightening safety incident i felt lucky to bring the car to a stop without an accident. The vehicle had to be flatbed towed to a repair facility. This sudden loss of power braking is a known, documented defect matching the engine-driven brake vacuum pump failures currently subject to federal class-action litigation (Thieme v. General Motors). I am requesting a formal safety investigation into why the GMC Terrain was excluded from previous GM vacuum pump recalls despite posing an identical, life-threatening risk to occupants."

While driving the vehicle became extremely difficult to stop I was advised that the Vacuum booster pump was broken and it needed to be replaced. This was first completed 09/24/25 by Gateway tire and service center. I was advised that there was a service bulletin for the issue. Then I have had the same thing happen and I returned the vehicle to the same repair shop and I was advised that the Vacuum booster pump was broken and it caused the exhaust camshaft to break, as well as the timing was out. The shop had to replace several things in order to repair and I was responsible for the cost. There was no warning before either of the incidents.

No engine lights are on. When at stops it starts chugging and when I accelerate sometimes it does not go like it should. It idles high and feels like it is slipping. I have almost been hit in the rear several times when this happens. One lady did rear end me but the damage was so little that I did not call the cops. This vehicle has not been inspected and it is available for inspection at any time.

The turbo went completely out at around 105k miles while I was driving to work. I had to coast into a repair shop because it was smoking and wouldn’t go over 20mph and then have it towed to the place that repaired it. Since then, the transmission is having trouble shifting gears. The car struggles to accelerate and I have to go abnormally slow after coming to a complete stop in order for the car to get into gear. The onstar diagnostic says everything is fine but it is clearly not fine.

My cars breaks failed by a vacuum pump failer and I almost died on the a hill going home

I bought this Terrain brand new from Betten Baker Chevrolet in Muskegon Mi in 2019 with 500 miles. That same year we had transmission Slippage causing it to slip out of gear then slam back into gear while driving. I took it to the dealer to have it looked at. They did nothing and informed me it was known by the manufacturer that this was an issue. I then had to bring it back for electrical issues as the lights would all start going off in the cab including dome lights and shift buttons. All key fob would not be recognized by the car and would have to be reprogrammed counting 5 times now. Now I am sitting at just oflver 100,000 miles and what I thought was going to be a simple spark plug change gas turned into a complete motor failure. did an oil change and there was no oil in it. The turbo was replaced and now the engine started making a lot of rattling noises and just stopped. the dash says service transmission, ECS, Extremely low battery voltage and has jost die after oil started pouring out the bottom of the car. It is now sitting at the dealership service department where I was told by am employee there that they have been seeing them come in at 150,000 miles for complete rebuilds and mine was early. let me tell you that this car isn't even paid off yet. And the 2006 Ram 1500 is more reliable.

Vehicle struggles to shift from low gears; seems to completely miss 3rd gear. Codes from maintenance indicate TCC slip

Friday July 25, 2025 I was driving my 2019 GMC Terrain SLE and when exiting the interstate the brake pedal got hard and I could not stop. After almost rear ending another vehicle, I got the vehicle into the ditch and safely off the road. After several attempts to correct the problem, I was unsuccessful. The vehicle was towed home and seen by a mechanic. The vacuum pump went out while I was driving.

Headlights flicker when auto stop releases and clicks back on to move the vehicle. This happens when it wants too but usually at the same time service parking brake will pop up, followed by steering is reduced, drive with care.. Lets see what else. Carplay no longer works. No sound. sd card error pops up. Car will not play music through a cord but will via bluetooth, but charges a phone. OnStar light flickering between green and red until I turned off power to the liftgate. (manually clicking over knob to disable) Headlights flickering can cause accidents. Sure hope there's no epileptics out. Yes, orielly. I have documentation, photos, videos, take your pick I'm here to help. Not evaluated at dealer or mechanic, who can afford labor rates? This has been happening for months and I will continue to report till something is done or lives are cared about.

When parked in home driveway brake lights came on with no one in car or driven during the day. Only way to turn off brake is to remote start & then cut off engine with Fob. Dealer diagnostic unable to find issue & condition didn't occur when at their location.

Friday July 25, 2025 I was driving my 2019 GMC Terrain SLE and when exiting the interstate the brake pedal got hard and I could not stop. After almost rear ending another vehicle, I got the vehicle into the ditch and safely off the road. After several attempts to correct the problem, I was unsuccessful. The vehicle was towed home and seen by a mechanic. The vacuum pump went out while I was driving.

My ESC randomly comes on. Service parking brake message comes on intermittently. Messages pop a up saying steering wheel assist limited, drive with care. Again, all of these are intermittent but when they happen my steering wheel locks up. Even mid turn. Being intermittent it doesn’t always happen and weather seems to affect when it happens, or that’s a coincidence.

My cars breaks failed by a vacuum pump failer and I almost died on the a hill going home

Drove car approximately 15 miles. Parked car. Car would not turn off. Message- Transmission/Park. Wouldn't Car stayed neutral. Had to call wecker to take dealership. ... Diagnostic Solenoid Valve Body faulty.... 2019 Terrain Miles 91669. Is there recall. Have more reports of issue. Should this happen with a well maintained vehicle All maintenance updated to date.

Recently experience rear differential binding with vehicle resulting in an accident.

My transmission keeps sticking when I shift into drive or reverse. Just a couple of days ago, it happened the worst it has ever done before. I shifted into reverse and my vehicle was completely stopped when I shifted. I began to let off of the brakes and gently push the accelerator to start moving back, my vehicle then punched itself into reverse. I felt after that incident, something had to have been damaged. I’m almost afraid to drive my vehicle after that. When my vehicle punched itself into reverse, I was literally jolted towards the steering wheel and thankfully my seatbelt caught me. Incidents with the the shifting into drive or reverse have happened before, but never nearly as intense. About a year ago, I brought my vehicle in to my local GMC Dealership for a concern with my transmission shifting weirdly and holding itself in gear at an unnecessarily high RPM speed. The technician stated to me, “with these 9-speeds, they tend to get confused at various speeds”. I asked him to elaborate and he could not. These issues have now gotten worse. With my suspension, every turn I take, I get a kreaking sound from my front driver side wheel well. It sounds as if my tire if going to break off. I’ve done visual inspections and nothing out of the ordinary is noticeable to the eye. My vehicle is a 2019 with less than 40,000 miles on it. I should not be having all of these issues. I’m genuinely concerned for my safety.

I got into my car to head to the store today. Upon closing drivers door I heard a muffled sounding pop. As I looked around I noticed back windshield looked “weird”. Got out and walked around the back to see it completely shattered. It just exploded and every inch has a crack or chip, even all asking the edges of the glass. I lifted the tail gate to see if a rock was thrown by chance and a chunk fell into the car. No rock was found. It simply shattered. The temp today was low 60’s on May 3rd, 2026 here in Ohio.

The contact owns a 2019 GMC Terrain. The contact stated that while driving at approximately 75 MPH, the panoramic glass sunroof shattered, causing shards of glass to enter the cabin of the vehicle. The contact stated that the panoramic sunroof was in the closed position when the failure occurred. During the failure, the front passenger sustained lacerations to the back, leg, and shoulder. The eleven-month-old child seated in the rear passenger’s side seat sustained lacerations to both legs. The rear middle seat occupant sustained a laceration to the rear head area, while the rear driver’s side occupant sustained lacerations to both arms. No injuries required medical treatment. The cause of the failure was not yet determined. The local dealer and manufacturer were not notified of the failure. The failure mileage was 58,000.

BOTH FRONT TIRES SHOWING HEAVY CHIPPING OFF OF TIRE TREAD

The contact owns a 2019 GMC Terrain equipped with Hankook Tires, Tire Line: Ventus S1 Noble 2 Tires, Tire Size: 235/50/R19, DOT Number: (N/A). The contact stated that while her daughter was driving approximately 45 - 50 MPH, the low-pressure tire warning light was illuminated. The contact's daughter pulled over and noticed that there was tread separation on the front passenger's side tire. The contact's daughter replaced the affected tire with the spare tire. The vehicle was later towed to the dealer. The dealer was awaiting approval from the manufacturer to replace the tire. The tire manufacturer was not made aware of the failure. The failure mileage was not available. The VIN was not available.

The contact owned a 2019 GMC Terrain. The contact stated that while driving at an undisclosed speed, another vehicle crashed into the passenger side of the contact's vehicle. The air bags deployed; however, metal fragments from the air bag hit the contact's face, causing severe injuries. The contact received medical attention. The vehicle was towed to a tow yard. A police report was filed. The vehicle was deemed totaled by the insurance company. The manufacturer was not made aware of the failure. The failure mileage was approximately 20,000.

I WAS IN AN ACCIDENT AND WAS HIT IN THE DRIVER ON THE DRIVER SIDE OF THE VEHICLE ON THE STREET. THE AIRBAGS DIDN'T DEPLOY DURING THE ACCIDENT.

The drivers side Seat belt buckle breaks somehow and we are unable to buckle the seatbelt in the car. After the first time, I bought another brand new buckle, replaced it. After one week of use, it also locked up. I am not sure what is going on and why such a thing keeps happening, but it is not safe and needs to be fixed ASAP. Not everyone has $80 to spend once a week on a new belt buckle which should last a lifetime. This is beyond dangerous, since seat belts are mandatory and my wife being unable to use it can be a matter of life or death. This is her only means of transportation and we can't just park it and use another. I can't possibly be the only one. Thank you for taking the time to look into this matter. Please let me know if there is any further information regarding this matter.

While I was driving on a highway, my sunroof suddenly imploded, causing shattered glass to fall all over myself and my car. The outside temperature was 50° and my car’s internal temperature was set to 68°. I reported this to the GM dealership and they told me to just report it to insurance. I am making a claim with insurance now. There were no warning or signs of this happening, just a sudden extremely loud noise and glass falling. No inspections have been done.