Equipment Problems of GMC Sierra 1500 - part 2

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.

See all problems of the 2022 GMC Sierra 1500 🔎.

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.

See all problems of the 2023 GMC Sierra 1500 🔎.

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.

See all problems of the 2021 GMC Sierra 1500 🔎.

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.

See all problems of the 2020 GMC Sierra 1500 🔎.

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!.

1. The vehicle’s emissions system is malfunctioning, specifically the ecm (engine control module) related to the exhaust emissions system. The diagnostic trouble code is p2c7a, indicating the system is not performing as expected. Key components such as the nox catalytic converters and diesel particulate filter have been repeatedly replaced, but the issue persists. The vehicle and all replaced components are available for inspection upon request. 2. The malfunctioning emissions system has led to an exhaust leak that allowed exhaust gases to enter the vehicle’s cab. This creates a hazardous environment for both the driver and passengers, exposing them to harmful exhaust fumes. In addition to reduced engine performance, poorer fuel economy, and emissions non-compliance, this exhaust leak poses a serious safety risk by compromising the air quality inside the vehicle. Prolonged operation under these conditions could lead to adverse health effects and further mechanical failures that impact vehicle safety. 3. Yes. The dealership has diagnosed the problem multiple times. The emissions components have been replaced under warranty on two separate occasions. The dealer attributed the fault to fuel quality; however, fuel distributor debunked these claims. 4. The vehicle has been inspected extensively by the dealership with invoiced repair work replacing key emissions control components. 5. The check engine light and service engine soon (ses) light have been illuminated with the diagnostic code p2c7a since the initial identification of the problem which started 3jun24.

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.

See all problems of the 2017 GMC Sierra 1500 🔎.

The onstar system has failed, which eliminates collision detection.

This truck is burning oil faster than it takes us to do an oil change we have to check it once a week to make sure it had oil in it. I have seen online I am not the only one having this issue this year make and model. I want to report this problem.

1. On 05/9/25, the exhaust emissions system malfunctioned, triggering diagnostic trouble code p2c7a (exhaust emissions system failure). This repair, the seventh attempt since June 2024, addressed the same recurring emissions issue previously involving replacements of components such as the nox converter (02/18/25, 03/13/24) and egr valve (02/18/25). The vehicle is available for inspection upon request. 2. The p2c7a failure risks limp mode, reducing vehicle power unexpectedly, which is hazardous on highways, especially while towing. Exhaust emissions system malfunctions release excessive pollutants, posing environmental and health risks to others. 3. Yes, the p2c7a code was confirmed by dealer during the 05/9/25 repair, following prior confirmations (e. G. , 03/31/25–04/05/25. 4. The vehicle was inspected by young Chevrolet-Cadillac during multiple repairs (e. G. , 03/31/25, 05/9/25). 5. Yes, the check engine light and onstar emissions alerts appeared prior to the 05/9/25 repair, first noted ~June 2024 (p2c7a onset). Exhaust smell and reduced fuel economy were observed intermittently. Symptoms persisted post-03/31/25 repair, leading to the 05/23/25 service.

Twice in the past month +. On [xxx] my wife and I were on our way to a family wedding and I was driving approx 75 mph on [xxx]. I don't recall if I had cruise control on or not as I rarely use it. There was no vehicle was in front of me for hundreds of yards yet all of a sudden the vehicle started to brake very hard. I accelerated as I did not know what was going on and I had a car in back of me that started to gain. Then last Friday ([xxx}) with my wife following me in her car on [xxx] through ellicott city MD I was traveling at approx 25-30 mph through a very small historic town when all of a sudden the same [xxx] thing happened. Def no cc on . When we got to our destination I asked my wife if she saw my brakes come on suddenly?. She replied yes and said she saw the truck dip hard. I told her the brakes did it again. She said I should call the dealer. I did not as they are useless! then the electronics. On star has a catalog of my complaints. The radio selections I make just disappear from the screen: apple car play disappears from the touch screen and just goes dark. I have to stop the truck. . (per on-star) open the door. . Get out. . Lock it. . Wait 2 minutes. . Get back in . . Restart the truck, and this re-sets the computers(s). Ridiculous! I do not have sirius but the radio goes dark often for about 2-3 seconds. , then comes back on. I was told it is my I-phone is causing this. [xxx]! what does my phone have to do with am/fm radio?? I was told by GMC there is a patch to update the software. Koons GMC told me there was no such patch nor recall. I paid nearly $80,000 for this piece of [xxx]! information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

The person I bought the vehicle from switched out the gauge cluster and lied about the vechiles mileage.

See all problems of the 2004 GMC Sierra 1500 🔎.

I am unsure except for what they told me the engine completely seized up I was heading back from grand junction colorado over vail pass nothing appeared wrong with the engine it was going fine and then completely powered itself down and stopped at the top of the pass would not come back on cost me 1100 to tow it down from a mountain getting no assistance from GMC other than they tell me one thing the dealer tells me another this is not the first time I've had problems with this it was in the shop from December through February no reimbursements no nothing nothing but problems since I bought it no help I've tried to do my best but my husband passed away at the time of all this was going on I could really use some guidance and some answers and what I should do they're telling me 8 to 10 weeks and they're not promising any kind of new warranty with this engine take what I have or buy an extended one from them that just doesn't right.

Gm has acknowledged there is a safety risk to continue driving my truck due to potential engine failure. I was prompted to take it to service to have the issue assesed which I did. The dealer said they would not inspect it because there is no resolution approved. I offered on 45/1/25 to pay them to check it out but they refused. This is dangerous and unacceptable, I hope you can help.

The transmission would purge forward when shifting gears. The shifting was very rough. This vehicle had recently been in accident.

The dealer is telling me there is a faulty engine coolant, flow control valve on this vehicle and multiple other people are having the same issue. The part is on backorder and takes months to arrive. They are telling me I can drive the vehicle, but it becomes a safety issue because the engine thinks it is overheating and goes into reduced acceleration mode, which can impact safely driving the vehicle. Pulling out in traffic and not being able to accelerate can be extremely dangerous.

Dealer keeps ignoring engine knock noise states its normal , mpg is down dramatically . Shift to park , vehicle only has 34k miles and dealer does not want to repair under warranty due to vehicle being a 2021 battery keeps draining for no reason , new battery added still does the same thing.

2023 GMC 1500 sierra denali ultimate tailgate opens without being commanded. This has happened approximately three (3 ) times in the last two months while being driven with the most recent incident occurring today, 04/27/2025. There are no warning lights indicating when a tailgate opens while the vehicle is being driven.

I have taken it in due to engine mounts 4 different times, transmission replaced and in October 2024 I took it in for issues I was experiencing like I had before my transmission went out. I did not get my truck back until almost Dec 2024 and that was due to there employee backing into the front end of my truck. So after all that my warranty was up Dec 24 2024 and then on April 16th 2025 I was driving my 2018 GMC sierra 6. 2l 1500 denali 129,600 miles at approx 30 mph it was late so the streets were empty and we started to hear a knocking or what I thought at the time was a very bad exhaust leak. We parked and then we started to try to make it home very slowly which we did and it was not making to much noise. The next day I called GMC and explained they said bring it in. I towed it there to be safe but it did start and still ran at very slow speed. They called me and said that the lift side rockers/ lifters 1 failed and it was stuck due to a misfire and that the engine would need to be rebuilt and sent me over some very vague break down which looked like a lump sum price. I requested and better break down and got a screen shoot and that when he said that’s the best they can do. There were no engine lights on or warnings nothing at all. It also just got serviced at GMC for an oil change on February 27th 2025 along with some air filters. Today is April 29th and still waiting for the service manage to call and see if they can do anything to help out instead of charging full price. I will attach pictures of the cost break down if possible. Thank you.

Unknown: transmission/torque converter etc. Like driving over "rumble strip. Shuddering (rumble strip feel, shake), when it happens (e. G. , during light acceleration between 25–80 mph).

My tailgate will randomly open on its own. I’ve had several instances( 5 or 6 times so far) when I’ve had open on its own. Only once so far when I was driving. Luckily, I was on my private road without anything in my bed that could fall out. I often carry mountain bikes over the tailgate which could pose a serious danger if the tailgate were to open when driving. Also earlier this evening when the tailgate came down on its own while driving, when I got to my destination, I was unable to open the tailgate at all from outside the vehicle. It is apparent the button to release the switch is malfunctioning. I was able to get it to open by using release button inside the vehicle.

The electronic tailgate randomly opens on it's own/fails and opens when it has not been pushed to open. The vehicle is available for inspection. The tailgate opens randomly and can be unknown that it is open. No warning of it at all. It has happened multiple times, the most recent being today 4/7/2025. I know that a recall has happened with other models for this exact same issue.

I was driving at approximately 25-30 mph, accelerating from a stop light and I felt a clunk, heard a grinding noise and my back wheels locked up. It was snowy/icy conditions so the back end of my pick-up slid out to the right a little bit before the wheels unlocked and I was able to regain control. I could have slid off the road or into another vehicle had the wheels remained locked. The computer system then alerted me to a transmission issue and to reduce speed immediately and call for service. The pickup was then unable to shift out of 1st gear. The vehicle has been towed to a dealer and I have been informed the valve body in the transmission has to be replaced which is 8-12 weeks backorder.