Equipment Problems of GMC Sierra 1500 - part 1

In the past few months this truck has been worked on twice. First was the valve body and now it is the coolant control valve. These things have caused my truck to completely slow down or shut down without warning.

See all problems of the 2023 GMC Sierra 1500 🔎.

Ac not working properly. Ac blows air to defrost vents foging front windshield and side windows causing bad visibility.

The onstar system and wifi connectivity stopped working over a week ago. The vehicle is less than two-years old, but it had three recalls which we took it in for this past week. We were told by the GMC dealership that one of the recalls would correct the problem with the onstar and wifi connectivity. However, it did not and now we are being told that the onstar module needs to be replaced, and the dealer says it isn't under warranty. GMC has tied the warranty of the onstar module to the miles instead of the time in-service. Many other customers are experiencing the same issue. Gm markets onstar as one of their safety features and as such repairs should be covered by the manufacturer.

The front chrome grill indicated in the recall came off while my wife and I were driving at 70 miles per hour. A big rig was passing in the on coming lane at the time. The part came off striking our front windshield almost causing a wreck and causes emotional trauma. It was a very scary experience. Our local dealer supposedly ordered the part two months or more ago from gm. They told us two days after the failure the part was still not available. I called gm who stayed the part was shipped well over a month and a half ago. Someone isn’t telling the truth. This incident should never have happened to us since it was a known safety recall. It should have been replaced.

See all problems of the 2022 GMC Sierra 1500 🔎.

I was sitting outside , and then all of a sudden my tailgate on my truck opened upped. And I heard there’s a recall on the latch but apparently it’s not on my truck when I looked it up on google. It does say some 1500s have the problem. I am very worried that it’s gonna open up in a parking lot on a car or a concrete bumper. Can you please look into this? my truck is going in for service next month and I would like to get it fixed with no charge of course because of the recall. Please call me if you have any questions. [xxx] . Thank you, [xxx] email— [xxx] information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

I am experiencing a recurring issue with my 2021 GMC sierra where the dashboard displays a “shift to park” warning even though the vehicle is already in park. This typically occurs when I attempt to shut off the vehicle. The doors unlock as expected, confirming the truck is in park, but the warning prevents me from turning off the ignition immediately. After a few seconds, the warning usually disappears, allowing me to shut off the truck. This issue is more frequent in cold weather, suggesting a temperature-sensitive electrical or mechanical fault. Based on research and community reports, this appears to be a known issue across multiple gm vehicles, often linked to a faulty micro switch or wiring harness in the shifter assembly. I am concerned about the safety implications, especially if the vehicle fails to shut off properly or if the issue worsens over time. Gm has not issued a recall for this problem, and I believe it warrants further investigation due to its widespread nature and potential risk.

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1. While driving slow or making a right hand turn the vehicle turns itself off 2. Periodically the car does not start/no power and does not respond to keyless car lock 3. Periodically the dashboard panel lights will not turn off, flash or some will go off but not all all of the above have been a twice repaired GMC recall 17276 and has been occurring since 2020.

See all problems of the 2014 GMC Sierra 1500 🔎.

Coolant control valve failure. Instantly reduces power on truck. National back order on parts. No remedy.

On [xxx], at approximately [xxx], while driving northbound on [xxx] between [xxx] and [xxx] (austin, TX) at roughly 65?mph, I suddenly heard a loud cracking and popping sound from the front of the vehicle. As I began to ease off the gas, unsure of what was happening, I observed what appeared to be a black object quickly shoot upward from the front driver’s side of the vehicle while traveling at highway speed. I immediately took the next exit [xxx] ) to assess the situation. I had no idea what to expect; my mind kept jumping to either hitting road debris or maybe even a blowout. To my astonishment, once I was safely on the side of the road and out of my vehicle, I noticed that the front left fender flare had completely detached from the vehicle suddenly and without warning while cruising at normal highway speeds. The 2023 GMC Sierra 1500 in question had approximately 29,800 miles at the time of this incident. I immediately contacted the dealer to schedule a repair, and all pertinent records, including photographs and a repair invoice, can be made available upon request. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

I’m filing this safety complaint in addition to a previous complaint, 11678151. Which occurred on August 1, 2025. On Friday, August 22, 2025, I experienced a 2nd traction control alert and engine failure lights on my 2026 sierra denali ultimate truck which again caused the acceleration to drastically decline while driving home from work. Thank god my kids were not in the car with me this time.  I am extremely appalled and confused as I've never experienced this level of substandard operation from a new vehicle. I have informed the leadership team team at cavender GMC west san antonio, TX of the situation. The dealerships recommended (2) paths to exit the vehicle: GMC customer assistance and dealership trade-in.

Vehicle showed me error code “ brake failure dont drive over 43mph “ and some other error codes I took the vehicle to the dealer because it was serious they made me sign a diagnostic fee document that I will be responsible for the diagnostic but the issue was just battery needed to be replaced according to the dealer we did the repair at the dealer battery + hours + diagnostic but the misleading error codes made me take the car to dealer what was unnecessary so please look into it customer are getting charged for unnecessary repairs because of misleading error.

My doors will no longer lock or unlock, using the key fob or the lock/unlock buttons in the vehicle. This is a widely known issue for GMC trucks, once you search for it. At around 50k miles, the door actuators just quit working. So, if I have kids in my truck, I can't unluck the doors to get them out unless I climb through the truck, and have to manually do same to lock the doors to drive with kids in the car. There isn't a key hole for the back doors, so this can't be done at all outside the car. The doors are supposed to automatically lock when the truck is put in gear. Mine won't lock even when I push the button to lock. I just had this confirmed at the dealer. I also spoke to GMC and was told that it wasn't their responsibility. This is a genuine safety issue, and happens on these trucks a lot.

See all problems of the 2020 GMC Sierra 1500 🔎.

To whom this may concern, this GMC truck with the 6. 2 has had constant engine issues regarding the lifters failure causing the engine to destroy itself internally I’ve had to get it repaired every 3 months on average there’s also a class action lawsuit that applies only to the 2025-2020 years however they are the exact same engine in the 2017. The transmission is not in sync with the motor having a late take off or sounds like the gears are grinding between shifting.

See all problems of the 2017 GMC Sierra 1500 🔎.

Driving down interstate highway and sunroof “exploded”. Raising glass sunroof up about 2” above the body. Vehicle had 387 miles on it. This occurred at about 6:55 am and outside temperature was about 74 degrees. The rupture was loud and very startling and I exited the interstate pulling over to see what occurred. There was no damage whatsoever to any other body component and no “flying” debris was observed at anytime that could have struck the vehicle. I requested GMC dealer to look at onboard cameras and save video but they seemed dismissive. Had the interior sunroof shade not been closed I would have been showered in glass while driving.

I am writing to express my extreme disappointment and serious concern regarding a critical safety failure I experienced with my 2025 GMC Sierra 1500 denali unlimited (VIN: [xxx] ), which I purchased brand new in April 2025 from cavender GMC, san antonio, TX. On Friday, [xxx], with fewer than 9,000 miles on the vehicle, I was driving on the highway at about 65 mph, with my minor son in the vehicle when the dash suddenly displayed a traction control (trc) fault message, followed immediately by "acceleration is limited. " the truck experienced a severe and unexpected power loss, severely restricting my ability to accelerate or maintain safe highway speeds. I was forced to pull off the road abruptly to avoid a potentially dangerous situation. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

The drivers side grab handle (a pillar trim piece) is cracked through completely at upper bolt mount location, causing the grab handle to be weakened and unable to safely support while using and could pull away from vehicle while in use potentially causing the driver to fall and become injured. I replaced the original with a genuine oem replacement from the dealership and it cracked in the exact same place. I posted an inquiry to a facebook group of fellow GMC owners and there were numerous reports of this having to them and having the dealership replace under warranty, only to have the issue occur again. This structural failure seems to happen with or without use of the grab bar.

My 2022 GMC Sierra 1500 shows message "shift to park" when turning off, even though it has been shifted to park. Have to play with shifter to get it to stop, sometimes turning it back on and off will do trick. Locking it with remote works most of the time but this last time it took over 10 minutes .

The truck started to vibrate or shudder . We are having to deal with replacing the transmission on our truck, which has only 45,000 miles on it. We have noticed numerous complaints about transmission problems with this model and the place that is replacing the transmission said they have had 3 customers in the last couple of months with the same issue on the same GMC model. This is a lot for our small town and area. Why hasn't GMC issued recalls ?.

See all problems of the 2018 GMC Sierra 1500 🔎.

Frame falling apart the coating peeled off was going to clean it to recoat it but the metal is so far gone took it to a frame shop only to find out it's not drivable anymore gm have to do better with the coating for this trucks.

See all problems of the 2011 GMC Sierra 1500 🔎.

The radiator needs to be replaced on the 3. 0l due to a leak in the seam of the radiator. The dealer has stated that they have had a few in the shop recently due to the same issue. There are a lot of complaints online that have the same issue, and customers have had to pay $3000 for the same replacement.

On or around July 12th 2025 at low speed of 2-4 mph my rear end locked up sending everyone in the vehicle hard stop forward. The vehicle wouldn't disengage leaving me no choice but to have it towed for the second time 1st time happened exactly the same about month and a half prior. GMC service department department claims they couldn't find anything wrong after it sat for two days in there lot after having it towed they were closed weekends and looked at it that Monday morning finding no signs of anything wrong. After picking up my vehicle I strongly feel like if at higher speeds or even environment this issue will endanger myself passengers and bystanders. I need help with resolving this safety issues ASAP please. GMC hasn't been much help service department nor gm support options.

See all problems of the 2019 GMC Sierra 1500 🔎.

2011 GMC sierra frame failed pennsylvania state inspection due to driver side frame rust/hole. The section of the frame must be replaced due to rust(improper coating. . . The truck has only 69700 miles on the odometer.

Tailgate opened several times without being prompted. Once while driving, two times while in park.

I washed my truck on a Saturday and as I was driving later that morning my tailgate opened while in transit. I did not notice this until I had stopped. After a little digging I found the 2019 tailgate electric switch is prone to this problem when it gets wet. There were no warning lamps for this problem.

The onstar module is no longer working. When I purchased the vehicle, the green light did not turn on. I called customer service, and they advised me to take it to the dealership since they were unable to connect to the vehicle. I am unable to contact emergency services in case of an accident, and I cannot access services like remote location and remote start from the mygmc app. I have seen several people online state that their module failed as well. It's a common occurrence that falls onto the customer to pay for. An update to the module seems to be the reason so many modules are failing.

When I am in park my engine shuts off the light goes from green to orange which indicates it’s still on electrically. I have to turn on/off my vehicle multiple times for it to turn off fully. It’s an intermittent problem.

My multipro tailgate on my 2020 GMC Sierra 1500 unlatched while a trailer was attached and backing up said trailer. The trailer jack post proceeded to buckle the upper part of the tailgate assembly causing extensive damage resulting in over a three thousand dollar repair bill. If the tailgate had released while a child was in close proximity, serious injury may occur. The tailgate has inadvertently released twice in the five plus years I have owned it, the first time as I was traveling down a highway at over 60 mph. This could have endangered a vehicle to my rear if cargo had been released on to the road. I have reached out to a local dealership for repairs and assessment, no real way of troubleshooting something that has happened twice in five plus years. The scan did not show any codes. The info center does notify you if it is released but not before it takes place and after the fact may be too late in some circumstances as it was during the second occurrence. There has been a recall on 2500 and 3500 models with the exact same tailgate but not the 1500 models. 820k vehicles affected but not on the 1500's.

The tailgate keeps dropping while driving and while parked. The key fob is in a protected area or not near truck at all when this occurs.

The tailgate automatically opens when I open the driver door. There is a recall on this for GMC sierras, same model and year but were manufactured in canada. This is happening to my vehicle but because it is manufactured in USA it is not part of the current recall. Please recall the USA trucks too. Dangerous!.

Subject: urgent safety complaint dear GMC customer service, I hope this message nds you well. I am formally reporting a serious safety issue with my GMC vehicle. The car has experienced multiple dangerous incidents due to likely electrical or software faults, losing power suddenly on two occasions while driving. This is especially concerning given the low mileage of 20,000 km and that the vehicle is still under warranty. Vehicle information: • model: GMC sierra sle, 2024 • VIN: [xxx] • current mileage: 20,000 km description of the problem & history: 1. First incident (at 3,000 km): o the vehicle completely shut down due to an electrical or system software issue while driving. O the vehicle was towed to the dealer and held for over two weeks for repairs. 2. Second incident (recently): o the vehicle again lost functionality; the gear was stuck in 1st gear, and I was unable to manually shift. O this occurred while driving, creating another unsafe situation. O the vehicle was again taken to the dealer for repair, and to date, I have not been informed of the root cause. Actions taken: the vehicle was brought to sarhan, uae (sharjah), al ghandi auto after the rst incident. Despite inspections and repair attempts, the issue has recurred, indicating it was not resolved. And I am prepared to provide photographic or video evidence if necessary. Additional context: • the vehicle is less than one year old and has been regularly serviced on time at authorized centers. The recurring issues strongly indicate an underlying reliability or manufacturing defect. Due to the severity and recurrence of these failures, I refuse any further repair attempts. I formally request either a full refund or a replacement vehicle, as this is unacceptable for a new car. Please acknowledge receipt of this complaint promptly and advise on the next steps for a swift resolution. Sincerely, [xxx] phone: [xxx] email: [xxx] location: sharjah, uae information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

See all problems of the 2024 GMC Sierra 1500 🔎.

Subject: urgent safety complaint dear GMC customer service, I hope this message finds you well. I am formally reporting a serious safety issue with my GMC vehicle. The car has experienced multiple dangerous incidents due to likely electrical or software faults, losing power suddenly on two occasions while driving. This is especially concerning given the low mileage of 20,000 km and that the vehicle is still under warranty. Vehicle information: •model: GMC sierra sle, 2024 •VIN: [xxx] •current mileage: 20,000 km description of the problem & history: 1. First incident (at 3,000 km): othe vehicle completely shut down due to an electrical or system software issue while driving. Othe vehicle was towed to the dealer and held for over two weeks for repairs. 2. Second incident (recently): othe vehicle again lost functionality; the gear was stuck in 1st gear, and I was unable to manually shift. Othis occurred while driving, creating another unsafe situation. Othe vehicle was again taken to the dealer for repair, and to date, I have not been informed of the root cause. Actions taken: the vehicle was brought to sarhan, uae (sharjah), al ghandi auto after the first incident. Despite inspections and repair attempts, the issue has recurred, indicating it was not resolved. And I am prepared to provide photographic or video evidence if necessary. Additional context: •the vehicle is less than one year old and has been regularly serviced on time at authorized centers. The recurring issues strongly indicate an underlying reliability or manufacturing defect. Due to the severity and recurrence of these failures, I refuse any further repair attempts. I formally request either a full refund or a replacement vehicle, as this is unacceptable for a new car. Please acknowledge receipt of this complaint promptly and advise on the next steps for a swift resolution. Sincerely, [xxx] phone: [xxx] email: [xxx] location: [xxx] information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

My GMC was listed under a recall that came out in 4-24-25. This issue can cause loss of propulsion to my vehicle and can cause serious risk of injury or an accident if the issue does occur. I tried to call my local dealer in auburn wa to address the recall and was told there is no fix as of yet. Because of how serious this issue can be I’m shocked GMC is dragging their feet on a fix. I think this needs to be looked into and expedited to avoid injury.

The plastic frame of the rear sliding window failed. This has allowed water to enter the cabin, which can cause mold and other health issues. This seems to be a common issue with these trucks. My truck has a certified preowned warranty and GMC said they would only cover part of it. They charged me $400 as a deductible, which there should be no deductible per certified preowned warranty. I feel like GMC needs to put out an official recall.

Tailgate switch tailgate opened on its own with trailer attached while driving damaging the top of my tailgate. No notification inside cab. No console / fob / tailgate buttons were pushed. Discovered tailgate was down after I arrived home and had done a wide u-turn in my back yard. So far dealership has done very little diagnostic wise. Two trips to dealership so far with little to no results. Now I’m scared to use my trailer or utilize the bed of the truck to haul anything due to tailgate might open on its own at 75 mph on a major interstate/ 2 lane road hurting or killing the people in the vehicles behind me. Totally unacceptable from GMC / dealer for a 70k truck.

The vehicle consistently shuts off unexpectedly when trying to park or slow down, making it difficult to steer or control. The electric power steering stops working, especially when turning at low speeds.