Table 1 shows one common equipment related problems of the 2024 GMC Terrain.
| Problem Category | Number of Problems |
|---|---|
| Equipment problems |
GMC adaptive learning transmission problems that lead to safety concerns, emissions reduction in mpg, and increased wear of the transmission. Regarding gm’s 9t45 automatic 9 speed transmission. Problem: - the gm adaptive learning of the transmission does not have safe guards in place to prevent unsafe sift patterns and behavior. This results in shift flair behavior where the transmission will drop out of 3rd gear and pause before shifting to 4th gear. It will learn to lock out 9th gear and it will max out with 8th gear at freeway speeds reducing mpg. And it will fail to downshift appropriately while driving leading to the operator wondering why the vehicle will not accelerate when needed; this casual downshift delay then results in excessive downshifting to the lowest possible gear where the vehicle will then lurch forwards; and then it will pause and maintain said lower gear and continue accelerating for 1-2 seconds while the operator presses the brake pedal in response of the vehicle jumping forwards. Individual situations: 1) lack of 9th gear use at freeway speeds. This is reducing the advertised emissions based on epa testing. This behavior skews official epa test results because vehicle operation is not as advertised. 2) shift flair and unsafe shift delays. This is the most serious behavior. It leads to pauses and delays in acceleration of up to 5 seconds, and it leads to pauses and delays where the vehicle continues to accelerate up to 3 seconds after letting off the accelerator and pressing the brake. 3) excessive wear. The badly learned behavior is causing issues with shift control pressure and logic, excessive clutch wear leading to damage and worn clutch packs. Analysis: - resetting the gm transmission adaptive learning to factory removes these problems, the trans will relearn bad behavior within 2-3 weeks of daily driving. Reset was performed using an autel hot function “quick learn” procedure for the transmission.
The electric power steering (eps) gear assembly / rack and pinion failed completely. Yes, the component is available for inspection upon request; it is currently located at the servicing dealership. A total failure of the steering gear assembly caused immediate loss of power steering assist, making the vehicle extremely heavy, rigid, and difficult to steer or control. This sudden mechanical/electronic failure puts the driver, passengers, and other motorists at extreme risk of a collision, especially if it occurs at highway speeds or while negotiating a turn. This did fail on me driving down the highway! yes. The problem was officially diagnosed and confirmed by the franchise dealership. They quoted $3,500 to replace the failed assembly. The vehicle displayed a "service power steering" warning message on the dashboard alongside an immediate loss of steering power assist. The failure happened suddenly while driving with no prior mechanical warning signs, symptoms, or gradual degradation.
The rear access closes on its own after sitting open for a period of time. I was sitting at grocery pick up with the access open. This caused it to close on worker at grocery pick up. It stayed closed and I had to hit the button to open it back it did not auto go back up when it couldn’t close.
This just started on it's own. Back up rear camera shows distortion from time to time and appears to be getting worse or happening more.
While driving several times smelt gas and car cut out engine came on and car stopped mid driving multiple times. Says they replaced fuel pump reset car etc.
The screen continues to go out. Screen contains many safety functions. When it malfunctions it is distracting.
The rear camera is displaying the top of the license plate! it wasn’t doing it when I first purchased the car. Dealer states it is normal. I do not agree.
A little over two weeks ago we were going to sidney to get groceries. It was hot that day so we turned the a/c on. Fog started coming out of the vents, it looked like we turned on a fog machine! a few days later we were going to town, my daughter got in and the whole driver's side floor was full of water. There was so much of it we had to get the shop vac out to suck it up. I called the dealer where we purchased it from because it still under warranty. Their shop guy was out for the week so they scheduled me an appt for the following week. By this time my speakers aren't working, my signal lights dont make any sounds when I use them and the floor is soaked again. On August 5th we took the car into high plains and left it. They said they worked on it for 4 hours and fixed the problem, some drain line was plugged with sludge and so the water knocked out a module or amp. I thot everything would be covered but then they said I'd have to pay because all of a sudden a mouse had causes that line to get plugged. I asked them for pictures because im turning it into my insurance company, and they said they would send them. They never have I requested the pictures 2x, once with patrick the shop manager and then with jeff presser, owner. Still today, nothing. Meanwhile yesterday here comes all the water on the floor again. We use this vehicle to haul my grandson to his therapies and medical appointments. He has cerebral palsy and has severe respiratory problems that requires him to be on oxygen. Now were worried that mold has started growing because even though were sucking up the water, the floor pad and carpet are still wet. I went online and have seen numerous people complaining about the same issue for years with these GMC Terrains, why hasnt there been a recall or national warning on this faulty problem?.
Vehicle shimmies upon acceleration from a stopped position.
Infotainment system safety issues. I have video. Multiple times per week when starting the car and backing the rear camera engages. When placing car in drive the rear camera never shuts off, the sound volume doesn't work, the entire infotainment system completely malfunctions. The safety is when attempting to function the controls the volume will turn up and not able to turn it down, the screen flashes and the infotainment systems controls on the steering wheel do not function. I've had it to the dealer and they indicate pic6591a from March 3rd 2025 is logged. When contacting GMC corporate they refuse to give any information. The pic spans across many GMC vehicles including 2019 models. Why hasn't this been addressed? my son drives a 2024 chevy trax and this car has no issues like the my car does. His car also doesn't have the transmission/gear shift buttons like the 2024 Terrain does. Anyone else having issues with the GMC infotainment systems, black screen, malfunction? I have video.
When shopping for a new vehicle I noticed this but purchased the vehicle anyway. I attempted to look under the hood of my new GMC Terrain. I have a (hopefully temporary) handicap from a medical procedure I have been dealing with for over a year. I found that the hood assist springs or air shocks have been eliminated from the 2024 model. I can lift the hood on my 2010 GMC sierra, but I had to have my wife help me lift the hood on my 2024 Terrain. My guesstimate is the hood weighs 50 plus pounds! once the hood is lifted you have to install a rod (stick, like the old model a and t cars) so the hood stays up. Yes, I am aware that Ford and Jeep have done this too, but that still doesn't make it right in my view. In this day and age of vehicle safety, and adding safety features to vehicles that I would never even have thought of, I can't believe this is ok! I can only imagine a mechanic bumping the hood rod, or a small child reaching up to boost themselves up to see what dad or mom is looking at or doing under the hood of the vehicle. This would cause a 50 plus pound hood to come crashing down on a person and that is ok? how about a short or elderly person? how much did the car manufacturers save by eliminating this feature at the consumers safety and cost? maybe the manufacturers don't want us under the hood anymore, but then they will have to find a better way to add windshield washer fluid or check the oil or brake fluid.