GMC Sierra Reviews

We were able to move the truck off the highway within approximately one-quarter mile. After shutting it down, we waited several minutes and inspected under the hood but did not see anything obviously wrong. When we restarted the truck, the deceleration message had disappeared. However, after putting the truck in drive and traveling approximately 20 feet, the notification returned.

Before shutting the truck off again we heard a ticking noise. Upon checking the oil, we found no oil on the dipstick. Based on the symptoms and information we located regarding reported issues involving the engine’s thrust bearing, we became concerned that the engine and turbocharger had suffered a catastrophic failure. We understand that GM has issued dealer guidance concerning this engine issue, reportedly involving imperfect machining that may contribute to thrust-bearing failure. Regardless of the cause, the failure occurred at relatively low mileage and left us stranded far from home.

Roadside Assistance Failure. We contacted GM Roadside Assistance and were initially told that a tow truck was on the way and that the vehicle would be transported to the nearest dealership, University Auto Center in Ellensburg, Washington. After waiting approximately one hour, we were contacted by Roadside Assistance and informed that no tow provider was available and that we would need to arrange transportation ourselves. This was a Sunday morning, and when we contacted local towing companies, we learned that none of them had been contacted on our behalf. We ultimately arranged for Belko Towing to transport the truck to University Auto Center. The failure of the roadside-assistance process caused additional delay, inconvenience, and expense at a time when we were already stranded in an unfamiliar area.

Experience at University Auto Center. I arrived at University Auto Center at approximately 7:30 AM the following morning when the dealership opened. I explained that we were more than 700 miles from home, that the truck had entered deceleration mode, that there was no oil on the dipstick, and that we urgently needed to return home. The service representative, Rachel, told me that the dealership did not provide loaner vehicles and would not assist with arranging a rental car. I explained my understanding that GM’s policy or dealer guidance provides transportation assistance when a vehicle with this type of issue is more than 100 miles from home. Nevertheless, my request for assistance was refused.

Rachel also stated that other customers were ahead of us and that the truck might not be diagnosed that day. I asked whether the dealership could at least inspect the truck and help us obtain a rental vehicle so that we could return home. That request was again refused. Rachel should be reprimanded and or terminated for failing my wife and myself. When I expressed my concern that the lack of oil and ticking noise indicated a severe engine or turbocharger problem, I was told that I could not know that and that the issue might only be a failed sensor.

GM Customer Service was also contacted, but we were told that the rental vehicle and hotel expenses were entirely our responsibility. As a result, my wife and I were stranded and had difficulty obtaining a rental car for two days, despite having a nearly new truck with approximately 24,000 miles that had experienced a potentially catastrophic engine failure.

Repair and Vehicle Transfer. I later contacted the dealership for an update and learned that an engine and turbocharger had been ordered. I was told that the repair could take approximately two to six weeks. Because we were far from home, I attempted to have the truck transferred to Hansen Motors in Brigham City, Utah, where I had purchased it. Rachel told me that the truck had been diagnosed and would not be released from University Auto Center. I am the owner of the vehicle, and I was not provided with a clear explanation of the dealership’s basis for refusing to release or transfer it. I called back later to speak with Bryan **, the service manager and was told he was unavailable and when I call in, I should ask for Rachel not Bryan. This is the same person that refused to help me from the start.

After several attempts in trying to reach Bryan **, the service manager and was unable to, I sent an email to University Auto Center and received a call from Beth, (Customer Service) who was professional and helpful and put me in contact with Bryan **, the service manager. Bryan handled the situation more professionally and provided better communication than I had initially received. However, there were still communication gaps. For example, I was not informed that the truck had been transported back to Utah until approximately two or three hours after it had left University Auto Center.

I received the truck back on 08/04/2026. However, I remain concerned about the reliability of the truck and the quality and long-term implications of the engine and turbocharger repairs. I also remain concerned about GM’s handling of the issue and the lack of timely assistance provided while we were stranded. STILL WAITING ON OUR REIMBURSMENT! We have over $3,000.00 out of pocket and they are going to reimburse us $1000.00 I was told by Bryan **. This was two weeks ago and still no word or money.

• Truck rental due to my truck being a work truck and unable to deliver parts in the car from Hansen Motors.

Please provide a written explanation of GM’s reimbursement decision, the applicable policy or program governing transportation assistance for this vehicle, and the status of any remaining reimbursement claim. I also request confirmation of the engine and turbocharger repairs performed, the parts replaced, the applicable warranty coverage, and any warranty extension or other protection available for this failure. Motor and Turbocharger replaced. Warranty stays on for the remainder of the original warranty. No other.

Conclusion. This incident involved a low-mileage 2026 GMC Sierra AT4 that experienced a serious failure while we were more than 700 miles from home. We were left stranded, received inadequate roadside assistance, were denied timely transportation support by University Auto Center (Ellensburg Washington) dealership, and incurred expenses that should not have been our responsibility under the circumstances.

Although Bryan ** at University Auto Center were helpful once I was able to reach him, the overall experience with GM and University Auto Center was unacceptable. Customers should not have to repeatedly escalate a matter to obtain basic communication, transportation assistance, and support after a serious vehicle failure. Thank you (Beth) for your help and professionalism! GM and University Auto Center need to do better. Please reimburse our documented expenses promptly and provide a written response addressing the concerns outlined above. 9/14/2026 Still waiting on reimbursement. Sincerely, [Brian] [Address]

GM’s answer? I am now past the 36,000 mile warranty, so no coverage. Never mind the open cases starting at 5,000 miles. My extended warranty does not cover it. The 100,000 mile drivetrain warranty does not cover it. And GM says the part is not emissions related, even though GM’s own warning light says emissions system. The defect was real, reported early, and stonewalled by policy until the clock ran out. That is not customer service. That is a warranty denial strategy. Would not buy GM again.

After a few days GM contacted me and said they could help me out with 600. I told them why if it’s a defect. They said sorry it’s been past the manufacturer warranty. I went to another 2 quotes with other Prestige dealerships and the quotes were 2,000. So to me Bert Ogden since they work with GM gave me a higher quote so the 600 that GM was going to help out with would disappear and still make more money with the work. I’m very disappointed with them.

They removed the features that were standard on older trucks like a 12 V accessory plug ((can’t even charge my battery jump pack in my truck) or navigation that was previouslyincluded with the vehicle and replaced it with paid subscriptions to Google.. Every time you get in your truck you’re prompted to allow Google to access all your contacts and then you are prompted with payment options to subscribe to Google and you cannot remove this from your vehicle. They even cheaped out on the Denali branded bed logo and use a generic GMC logo. I’ve had 10 Duramax and this is absolutely the worst truck I’ve ever had and I absolutely hate driving it, and I cannot stand even getting in it as the seats are bricks..

Often, turning the truck on and off a few times resets the entertainment system. Invariably, requesting it be updated and “fixed” at the dealership, requires a several-hours wait, that accomplishes nothing but waste time. GMC needs a decent software engineering team to investigate and fix the entertainment center glitches.

I am very disappointed and regret my purchase already. I understand that parts fail, but this was a brand new vehicle. I also understand that I live remotely and it wouldn’t be a problem for most people. But I was told that since the vehicle was “operable” that GM most likely help out. If I was to go home without getting the camera fixed, I would have to turn around as soon as I got home and put my truck on the barge ($3,000) to Washington. I would then be out of a truck and $6,000. I don’t know if someone would pick it up or I would have to fly down and drive it to the dealership and get a hotel until it was complete. This is very frustrating as I purchased a 2026 vehicle, expecting to not have any issues for a long time.

I picked up the truck in Texas, the very next day the transmission was acting out again but I was able to make it to Las Vegas. Stopped by my dealership regarding the issue, was told that the truck needed to be driven for a month so the transmission could synchronized with some modules and sensors. After a month I went to Colorado, transmission failed again and the top of it, there is a also a big leak underneath the engine, the master cylinder leaks as well… The truck is just falling apart. Took the truck to the nearest dealership in Denver, was told they will look at it in 7 days…. Then a few days later got a phone call from them to tell me that they won’t look at the truck for weekS… Unbelievable!

I called the GMC customer service and got the truck towed to another dealership that was supposed to look at the truck on Monday…. Then same BS, got a phone call about three weeks ago to letting me know that they will only look at the truck on the 8th…. Haven’t heard from the dealer since so I called today to check in on the repairs…. The Dealership can’t find my truck!!! They never had it! The truck is nowhere to be found, called multiple dealerships, GMC towing assistance, GMC customer service… Nobody has answers and they just don’t care.

I am still trying to get compensation for the breakdown in Texas, trying to get compensation for the breakdown in Colorado, trying to get my truck repurchased and now trying to locate my truck… It’s just been a nightmare. My case manager Allie is incompetent, she sounds like she is 12 and just apologized on the phone in repeat mode, I think she is AI! GMC is supposed to be the top of the top…. Well it’s not! It’s time to lawyer up.

Reps promised supervisor callbacks—none came. I sent in all required documents—no response. My vehicle was returned, but I’ve received no reimbursement and no accountability from GM. This is hands-down the worst customer service experience I’ve ever had. If you’re considering GM for your next EV, you should think twice. The product failed, and the company failed even harder.

Maintenance has been flawlessly maintained, ALL service work has been at a GMC certified dealership. Truck is at 104,400 miles. Engine started failing at about 96k miles (probably sooner) but General Motors has worse customer service than a ** cell phone company and won’t stand behind their products no matter what! This GMC vehicle has set my family so far back financially that it will take us years to recover! The General Motors Company could care less! They don’t believe in their own products, so why should we? I can’t support a company that doesn’t have the decency to support their own products! Shame on you General Motors!!!!

Clear coat started pealing just as the warranty was expiring and GMC said too bad. Fortunately my dealership stepped up to take care of it at cost. Since then more clear coat started pealing from the body of the truck requiring a full paint job. Visor clip hasn't worked since the truck was new and I have gotten tired with all the excuses on what was required to fix it. Leather on the steering wheel is peeling off (guess it wasn't real leather). And the list goes on - Bottom line is that after being a GMC customer for over 25 years, I will never purchase another vehicle from them ever again.

We pulled in on Wednesday at noon and crossed our fingers that it wouldn’t be a big issue and we’d be on our way soon. A mechanic took a look and decided that it must have been bad DEF and suggested that we would need to have the DEF tank dropped and drained at a cost of $600. That was not the fix and on Thursday he said that we needed to replace a NOx sensor, at a cost of $700. That also did not solve the problem.

On Friday the service manager said that they had reached out to GM tech support and were waiting for feedback from them. I asked if their mechanics ever worked on Saturdays. He replied sometimes, but I found out that he did not come in that Saturday to work on our car. Until this point we were stranded in our travel trailer in the parking lot of the dealership when it occurred to us that most dealerships offer a loaner car when your vehicle is in for servicing, so we asked and we were able to have a loaner car. So glad that we asked because it was not offered.

On Monday the dealership heard back from GM tech support who suggested that we would need to replace the diesel particulate filter at a cost of approximately $3000. They also mentioned that the part would be hard to find as their initial search revealed nothing. The service manager said he would be back in touch with us by Thursday, either way. On Wednesday my husband called to check in with John. No luck, and it may actually take two weeks to get the part. At this point we were waiting for an entire week.

When we got this bit of news, we decided to call customer service at GM. It doesn’t make any sense to us that a car manufacturing company would not be able to help find a needed part to make a repair to one of their own vehicles. The customer service department was not able to help us find the part either. That evening we were telling the tale of our bad luck to the campground supervisor and she mentioned that there were great diesel mechanics in a nearby town called Findlay.

The next day we called two different car dealers in the Findlay area asking for their help to find the needed part. One of them gave us the name of a dealer that was quite helpful and gave us the number for another dealer to try. We called this dealer and were very pleased to find that they had one in stock. We got all the details and planned to drive right there to pick it up. My husband called John back to tell him we found the part and we would go pick it up in our loaner truck, John responded by saying the dealership didn’t like their loaner vehicles going on long trips, it was an hour each way! When I called John, he said he found the part! He did not, I found the part! It’s not a game and we were both quite disheartened that John found it necessary to lie about the situation.

The part was in hand for the mechanic to get it all repaired and by 11:30 Friday morning it was complete. Unfortunately, the service manager was not working that day so we wouldn’t see him, but he had our keys and paperwork so we had to wait for him to drop them off at the dealership. We were told to come in at 2:00. Amazing that even after waiting 10 days for our repair to be completed the service manager still needed to hold us up by making us wait. And why were the keys not at the dealership in the first place? The cashier asked when we paid our invoice if we would like to sign up for the GM Rewards program. We figured yes since we will need a new car sooner rather than later. Even though we took the time and gave all of our information, through the acts of the cashier, we were never enrolled in the program.

John had told us that since those other repairs had been made and not been the actual issue that he would work with us on the price of the repairs in total. When we went to retrieve our car and pay the bill there was no such allowance. In addition, there was a $400 core charge added to the bill but not cancelled out with the expectation of returning the bad part. We only knew about this because we had found the part and that dealer had mentioned it to us.

To add insult to injury we left the dealership with a bolt stuck in one of the truck tires that needed to be removed and repaired. In addition, even though there was a car wash at the back of the dealership our car came back to us filthy dirty. We have been speaking to a customer service representative named Troy who has been very friendly and understanding but unable to offer any type of good will. This has been one of the worst experiences of our lives!

After service I got in the truck and saw a broken switch in the armrest. They didn't even mention that they broke the switch. The total bill was over $3000 for gear oil and oil pan gasket. I questioned the billing and services. So it's been 3 weeks and still no refund for double billing and the diagnostic charges. The gasket replacement itself was $1000, my truck is lifted 10 inches and no skid plate, literally 6 inches between it and the cross member. Btw, not a gasket replacement just sealed with goop. This place is a ripoff! I will be shopping for a new vehicle soon.

Out of the first fifteen thousand reviews all fifteen thousand stated the same issue and concern with the GM motor and GM until this day 10/24/2020 has still done nothing to correct the engine problem. Even during this time of the pandemic era GM is still denying any blame or fault. I drive 68 miles daily to and from work. How am I supposed to make it to work now. GM hasn't even mentioned a loaner or any assistance with the cost of the repair. I still have 17,000+ and 3 years left to pay on this truck and what does GM say? They say sorry its an out of pocket expense.

I at one point loved and respected the GM company. At this point I will never think of buying another GM vehicle. And out of all the money that I have put in to my truck is now a complete loss. And do you know what GM says, they say it's an out of pocket expense. There is no loyalty or any customer concern when it comes to the GM company. And then they put these people over the phone that sit in a call center all day and rehearse and practice their response to questions asked by the customers, You would expect the foreign companies to be the ones that take advantage of the American customers, but it GM an American company taking advantage of the American people, Americans taking advantage of Americans isn't that what Americans do to each other.

And then the representative tells me to take it to a GM dealer so they can communicate with the dealer one on one. And then mentions a loaner car. But they are also telling me that it's an out of pocket repair, so who's going to pay for the loaner? I guess I will be the one paying for the loner also right. These representatives are hired and trained purely for what wages they can be paid and not questioned. Almost the same as working in a sweatshop. I can hire people to answer the phones for me at a rate of one dollar an hour, I've done the research. GM may seem as though they are a reputable company to do business with, but they are not. The main concern of GM is the timely production and sale of their products. Once the vehicle leaves the dealer it's an automatic out of pocket expense for the customer.

1. Brakes squeak after starting forward and back. This started happening around 2000k miles. Every time I back out of my driveway it sounds like I am scratching metal together. My neighbors are like you paid what for that NEW truck???

2. Rear camera, trailer cam goes blue screen where you can still see the objects in the view but it’s tinted blue. This week it turned black in the trailer camera view area.

3. Entertainment screen goes completely blue with yellow notice to “service rear camera system”. Can not see any of the cameras in reverse when this happens.

4. Radio stations just don’t turn on sometimes and I have to change radio stations and then go back to the one I had on when I started the car for it to work.

5. MOST DISTURBING - when the truck was in PARK and in about a 20 degree upward angle it started rolling backwards. The wheels turned about 1/4 and I ran around and hit the brakes. This is very concerning because what if a kid or animal was behind the truck and if started rolling. This is a MAJOR issue. Lucky for me it happened when I was with the dealer so they saw it and said they have never seen that one before.

Overall the look of this truck is the best on the road but the consistent issues make this truck sub par. GM keeps trying trying to blame the dealer and the dealer has supplied them with all of my documents. I have taken pictures, videos and multiple service visits. GM told me to go buy new brake pads. I am getting my legal team involved as GM takes no responsibility for these issues and keeps saying, just go to your local certified dealer. I will update as I get more info.