Power Train Problems of Chevrolet Suburban - part 1

The contact owns a 2017 Chevrolet Suburban. The contact stated that while driving at an undisclosed speed, the vehicle suddenly came to a complete stop. There was no warning light illuminated. The contact attempted to accelerate, and the vehicle drove sluggishly as if the tires were flat. The vehicle was taken to the dealer where it was diagnosed with transmission failure. The contact was informed that the transmission and motor mounts needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 125,000.

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The vehicle was shaking and shuddering when trying to maintain highway speeds. Would have to slow down to maintain safety. The dealership advised the transmission needs replaced however we are seeing this is a widespread problem that gm has refused to admit fault for.

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The failure involved the transmission valve body control valve within the automatic transmission system of the 2021 Chevrolet Suburban, a critical component responsible for regulating hydraulic pressure and controlling gear shifting. The malfunction caused erratic and unreliable shifting behavior, including hesitation, harsh engagement, and loss of proper acceleration; the failed component is in the custody of northside chevy in san antonio, TX. This issue created a significant safety risk, as the unpredictable transmission response impacted the driver’s ability to accelerate when necessary (merging onto high traffic roads) and increased the likelihood of dangerous situations like rear-end collisions or loss of control. The problem was confirmed by an authorized Chevrolet dealer, where diagnostic testing identified faults in the transmission control system and verified the failure through performance testing and fault codes. The vehicle has been inspected by the dealership service department, though it has not been directly examined by the manufacturer, law enforcement, or insurance representatives; however, documentation of the diagnosis is being withheld by the dealership. Prior to the failure there were no warning signs present. Only after failure did the check engine light illuminate, transmission-related warning messages, and noticeable symptoms such as hard shifting, delayed engagement, and slipping, which appeared shortly before the complete failure and significantly worsened over the three-mile drive to the dealership.

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2021 chevy Suburban started to have harsh shifting particularly on acceleration and shuddering at higher rates of speed (feeling like you are driving over a rumble strip). I took it to the dealer, and they confirmed the torque converter was in the process of failing. It's currently in the shop getting a new torque converter. No warning messages/lights had yet appeared. Technician at dealer stated that this was a common failure with this model.

Transmission malfunction. This has appeared several times at highway speeds and low speeds. Driver to limp along in the slow lane to exit ramp and take back roads to get back to base. The current problem has been confirmed with error codes p0747. Check engine light comes on with a screen prompt “reduced acceleration drive with care”.

Unknown transmission issues mentioned in other recalls for same period/make model as listed yet my VIN was not, as a mother 4 little ones I need my vehicle to perform as it was design to, the cost for this repair is over 6,000. 00 I have already invested over 40,000 since I brought it. I feel they ought have included my car on this recent recall they had to have known this problem was of their why else would there recalls. I still must pay monthly for a vehicle that does perform as it should. This impacts my ability to provide for the needs of my children. I hope relief is on the way.

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My husband was driving our 2018 chevy Suburban when it suddenly stopped accelerating and he could no longer shift gears. Luckily, this happened while he was driving down a gravel road (approx 25-30mph). If he would have been driving at highway speeds, it is likely that he could have lost control of the vehicle. Our Suburban had no issues to this point and had always run well. We take it in for routine maintenance. We had it towed to a local repair shop, and they informed us that something had happened with the transmission and that it would need to be replaced. I have found several gm transmission recalls and our situation sounds similar to reference n252536750. Again we had no warning signs and had been experiencing no issues with our vehicle. If this had been something that we had been noticing problems and hadn't gotten it looked at, I can understand that maybe this had been something on going for a while that we had just missed maintenance on. However, for the transmission to stop so suddenly, I believe there must be some sort of larger failure in the transmission system.

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The vehicle would jerk when changing gears and would have a rattle and vibration when accelerating.

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The transmission of the 2021 Suburban failed. While operating the vehicle down a state highway, out of nowhere the power was reduced significantly while in traffic. It would not go over 30 mph after forcing itself to 30 mph while driving down the busy highway. After struggling to find a safe place to park, the vehicle would not, and still will not, go into reverse. There were no warning lights of any sort prior to this incident. Now there are several warning lights. The vehicle has been towed and taken to a repair shop with current unknown diagnostics as we are waiting our turn for the vehicle to be diagnosed. This vehicle has a transmission that is currently under class action for gm knowingly selling defective transmissions.

With out any warning engine shake and running roughly loud engine noise more than ticking and losing power with reduce speed.

The contact owns a 2021 Chevrolet Suburban. The contact stated that while driving at an undisclosed speed, the vehicle jerked abnormally while shifting into reverse(r) or drive(d). The contact stated that the vehicle lost motive power with the check engine warning light illuminated. The contact was able to restart the vehicle; however, the failure persisted while attempting to drive. The contact also stated that the vehicle was put into limp mode several times. The dealer was contacted; however, the vehicle was not diagnosed or repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 78,000.

I am writing to formally report a critical safety defect in the vehicle’s transmission system. While driving, the vehicle began experiencing severe vibrations, accompanied by an abnormal increase in engine rpms, while the vehicle failed to accelerate appropriately. The vehicle became unresponsive, limiting my speed to 15-20 mph. This forced me to make frequent stops every 6-7 minutes to allow the transmission to cool down, as the car would not sustain normal speeds. ?this failure created an extremely dangerous situation on the highway. Due to the sudden loss of power and inability to maintain traffic flow, I was subjected to aggressive behavior from other drivers, who were honking, gesturing, and clearly endangered by my inability to accelerate. This transmission failure is a major safety hazard that renders the vehicle unreliable and dangerous to operate in any traffic condition. I am requesting an immediate investigation into this transmission defect and a permanent resolution from general motors, as this issue poses a significant risk of causing a collision. I spoke with the owner of aamco, and he showed me that they have 7 of these chevy Suburbans, GMC yukons, and chevy tahoes, escalades, and they all have the same problem, the transmission needs to be replaced, and general motors is not notifying car owners about this problem, but it should.

2025 Chevrolet Suburban high country. Vehicle is parked in my garage. Went out in the am and the engine only cranks, will not start. Called on star for roadside assistance. Sent a tow truck, the vehicle could not be towed due to the electronic transmission. There is no way for an owner to place the transmission in neutral. Vehicle is stuck in my garage. Gm customer service referred me back to roadside assistance who for the second time stated that they could not help me. This is a serious issue. The fact that the transmission can not be shifted into neutral unless the engine is running is a very serious safety concern. Called gm helpline a second time. They said that I should call for a tow on my own. Waiting for the selling dealer to call me back. Vehicle is currently stuck in my garage and gm does not care.

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Having reviewed online your safety recall number n252536750, I am experiencing the same issue (right rear wheel occasionally locks when starting from a standstill and turning right). It only lasts about 1 or 2 seconds while accelerating. However, when I discussed this with my Chevrolet dealer, I was told that according to the VIN for my 2022 Suburban 3. 0l diesel, I am not part of that recall. I plan to take it to the Chevrolet dealer very soon for more analysis. However, I wanted to bring this to your attention, as it could be hazardous. I have not gotten any dash warning messages. Thank you.

Suburban started to have shudder at lower rpm on acceleration. I took it to the dealer and they confirmed the valve is bad. They are unsure at this time but depending on damage from the bad value my Suburban may also need a new torque convertor or transmission.

The contact owns a 2019 Chevrolet Suburban. The contact stated that while driving at an undisclosed speed, the vehicle slowed down and failed to properly shift gears. The contact shifted into neutral while stopping the vehicle. Additionally, the contact stated that the vehicle failed to accelerate as needed. The vehicle was driven to a dealer, where it was diagnosed with severe fluid leakage and torque converter shutter. The contact was informed that the transmission needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 112,000.

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While driving down the high way with the check engine light on, a message appeared on the screen and said “unable to shift soon. Service transmission immediately. ” after driving a few more miles the vehicle shifted to neutral, and then as soon as I got on the shoulder of the highway and slowed to approximately 5 mph, the vehicles wheels locked up and the car jerked aggressively into park. This exact issue has occurred multiple times while driving. It is unsafe to drive the vehicle.

Two years ago, we had to have the transmission rebuilt after it kept slipping. Yesterday, as I was driving on I-95, I was passing a vehicle and pressed on the gas. There was a loud crunching noise and I lost acceleration. The check engine light came on right away and I couldn’t press on the gas without a noise and limited forward momentum. I then had to maneuver the car across four lanes of traffic with limited control over speed. There was no warnings an issue was going to occur. We had it towed to our mechanic who said there was low compression in cylinder 1. Less than 90 psi. Again, we had already had the transmission replaced and now this major engine issue. We are in the process of getting it to a chevy dealer.

The transmission just stopped working no warning just wouldn’t go into gear. Then I turned it off and back on and was able to limp home it’s slipping bad .

On Friday, March 13, 2026, while traveling at approximately 60 mph on the highway, my 2021 Chevrolet Suburban equipped with an l87 6. 2l v8 engine experienced a sudden and complete loss of motive power. The failure sequence began with a dashboard warning prompting me to "press the start button again," followed immediately by the vehicle shifting into neutral without any driver input. Despite repeatedly pressing the accelerator, the vehicle continued to decelerate and could not re-engage drive. A second dashboard warning displaying "engine recall" then appeared mid-incident. Subsequently, the rear wheels locked, forcing the vehicle to coast to a complete stop on the hard shoulder without any brake input required from the driver. Upon coming to a full stop, the start button continued flashing with repeated prompts to press it, the vehicle lock emblem illuminated on the dashboard, and the vehicle became fully and mechanically immobile, unable to shift out of neutral or transition into any other gear. The engine could not power the vehicle at all. My safety and the safety of other motorists were directly and seriously endangered, as the failure occurred without warning in the middle lane of an active highway at highway speed, leaving the vehicle unable to maneuver or accelerate out of harm's way. A responding police officer confirmed the road hazard on scene and remained present to protect the vehicle and occupants while we awaited assistance. The aaa tow truck operator independently concurred upon arrival. The vehicle was transported to classic Chevrolet, grapevine, TX, the same day and is currently awaiting full technical inspection by the dealership's service team; an official mechanical diagnosis remains pending. The dealership service advisor has verbally confirmed awareness of an active engine and powertrain/transmission recall affecting this vehicle. The failed component — the l87 6. 2l v8 engine and associated drivetrain — is available for inspection.

My 2021 Chevrolet Suburban experienced a sudden and complete engine failure at approximately 79,000 miles. The vehicle became inoperable and is currently at a dealership pending evaluation. There were no prior warnings indicating an imminent catastrophic failure. A sudden engine failure of this nature presents a significant safety concern, including the risk of loss of propulsion during operation. The failure has been confirmed by the dealership, and no repairs have been authorized at this time pending further review. This complaint is being submitted to document a sudden and severe engine failure and to request evaluation of potential safety-related defects involving internal engine components.

Upon stepping on brakes, the car shifts into neutral and says “press start button again. ” this happened to me 2x now.

Check engine light with rough shifting and vehicle wouldn’t go in reverse. For safety reasons we had the vehicle towed to our local chevy dealership. Transmission needed a valve body rebuild. This is a known issue with this transmission but our VIN wasn’t under that recall.

The contact owns a 2022 Chevrolet Suburban. The contact stated that while driving 50 mph, the transmission unexpectedly shifted to neutral(n) and the vehicle shut off. The driver was able to coast safely to the side of the road. The vehicle failed to restart. There were no warning lights illuminated. The vehicle was towed to the local dealer, where it was determined that the engine needed to be rebuilt or replaced. The vehicle was not repaired. The vehicle was previously taken to the same dealer for a prior recall repair. The dealer had provided a loaner vehicle. The manufacturer was not notified of the failure. The failure mileage was approximately 58,166.

On February 28, 2026 at approximately 6:08 pm, while traveling at approximately 40 mph on s. Third street extension near route 119 in mebane, nc, my 2026 Chevrolet Suburban high country experienced a sudden catastrophic drivetrain failure at 2,010 miles with no prior warning symptoms. A loud bang was heard, and the vehicle decelerated sharply. Dashboard warnings appeared for transmission and steering service. The vehicle continued approximately 60 feet while producing severe grinding noises before all four wheels locked completely and the engine stalled. The vehicle was rendered completely inoperable and stranded in the roadway. My wife was a passenger. Onstar was contacted and dispatched local law enforcement to provide traffic control while the vehicle was disabled. Onstar also arranged emergency towing to modern Chevrolet in burlington, nc. This failure is consistent with the transmission control valve body defect covered under NHTSA recalls 24v797 and 26v085 affecting gm 10-speed automatic transmissions (10l80). Gm has been aware of this defect since at least 2024 yet vehicles continue to experience catastrophic wheel lockup.

The contact owns a 2022 Chevrolet Suburban. The contact stated that while his wife was driving at an undisclosed speed, the rear wheels seized. There were several unknown warning lights illuminated. The message "reduced acceleration, drive with caution" was displayed. The contact's wife pulled into a parking lot, but the transmission failed to shift into reverse(r). The vehicle was towed to the dealer, where it was determined that the transmission control valve needed to be replaced. The vehicle was not repaired. The contact related the failure to NHTSA campaign number: 26v085000 (power train); however, the VIN was not included in the recall. The manufacturer was made aware of the failure, and a case was opened. The failure mileage was approximately 86,000.

Pulling off from a stop sign on a hill, the car wouldn't accelerate and rolled back hitting a pedestrian and then jerked forward aggressively burning rubber on the tires. I smell the transmission burning. Luckily the lady didn't want to press charges.

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Just purchased this vehicle used from a business in moyock, nc. The mileage at purchase was 92,860. We checked carfax and it showed two previous owners and had a steady maintenance history. On the way home (2 hour drive) and after the vehicle had warmed up it started showing signs of transmission problems. This was not noticeable on the test drive. The rpms skyrocketed, the car went into neutral, once we got it back into gear it would hardly accelerate. It was a long long drive home! we took it to our local mechanic and must replace the transmission at a cost of $7,000. We will not use the manufacturer's transmission product as a replacement after reading all the complaints that are so similar to ours. Definitely not what we were expecting to have to do within a week of the purchase. There could have been injuries if my wife had not been following me and knew something was wrong when the vehicle slowed down significantly. No one was injured, except for our pride and wallet.

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My [xxx] daughter lost the ability to put the vehicle in reverse while running errands on a Saturday. We had to push the truck out of the parking spot "backwards" in neutral in order to get the vehicle in a position to put it in "drive". She had been going in and out of shopping centers (forwards and backwards) earlier when the reverse suddenly stopped. I dropped the vehicle at a nearby auto shop in a fit of desperation (maybe 1/2 mile away). They told me they thought the transmission was shot, so I picked it up and took it to andean Chevrolet (dealer) in cumming, GA. While driving it to andean on Tuesday (2/17), the transmission went into low acceleration mode where I couldn't go into upper gears and topped-out at 3,500 rpm's max for the 13+ miles (30 min) drive. Andean confirmed on Friday (2/19) that the entire transmission is shot with metal all inside of the fluid, gears being broken, and the valve body being broken. The truck is 5. 5 years old with 93k mile on it and we were just shocked. The repair for gm reman transmission was quoted at ~$9. 2k and we just finalized a call directly with gm customer service to see if gm would offer any discounts to the dealer on the repairs. We are still waiting on that result while the repairs are being made. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

The contact owns a 2021 Chevrolet Suburban. The contact stated that while in reverse (r), the vehicle failed to reverse as intended. The contact’s wife continued driving at approximately 55 mph, and an unknown message was displayed, and the vehicle failed to exceed 55 mph. Additionally, the transmission was stuck in gear and failed to upshift into the next gear as designed. The vehicle was pulled over to the side of the road, and the battery was disconnected and reconnected, but the message remained displayed. The vehicle was towed to an independent mechanic, where it was determined that the transmission control valve needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was approximately 81,600.

I am submitting this complaint to report a serious safety issue involving my 2021 Chevrolet Suburban equipped with the 3. 0l duramax diesel engine. The vehicle has experienced a recurring problem related to the engine wiring harness. While driving, the vehicle will unexpectedly stall without warning. At the same time, there is an immediate loss of power steering assist, significantly reducing the ability to safely control the vehicle. This creates a dangerous situation, especially at highway speeds or in traffic. The failure appears to be linked to a defect or malfunction in the engine wiring harness, which may be causing intermittent electrical interruptions to critical engine systems. There were no prior warning signs sufficient to prevent the incident. This issue poses a substantial safety risk not only to the driver and passengers but also to other motorists. Sudden engine shutdown combined with loss of steering assist increases the likelihood of a crash. I believe this may be a systemic defect affecting other vehicles of the same model and configuration. I urge the national highway traffic safety administration to investigate this issue and determine whether a recall should be issued. Vehicle information: make: Chevrolet model: Suburban year: 2021 engine: 3. 0l duramax diesel.

Transmission stalling, hesitating, affecting engine performance and rpm's. Broke down on highway. We replaced the transmission, now it's doing a similar problem and the mechanic says the engine is failing, cylinders issues. I've read up it's happening to many of the same year make and model. I spent 7k on a new transmission. Now a new engine??? . . . Frustrating! please help.

My vehicle was subject to a gm recall involving inspection of the 6. 2l engine. The recall inspection was completed by an authorized gm dealership at 58,581 miles. The vehicle was cleared as passing the recall criteria and returned to me. Within fewer than 10 miles after leaving the dealership following the recall inspection, at approximately 58,590 miles, the vehicle experienced a sudden loss of propulsion while traveling at highway speed (approximately 65 mph) on a divided u. S. Highway while ascending an incline. The vehicle shifted into neutral and lost engine power without warning. Steering and braking remained functional, but the vehicle lost forward motive power in the left lane of traffic. Attempts to restart the engine resulted in a loud mechanical thud, and the engine would not restart. The vehicle was towed to the dealership. The engine is now being replaced. Prior to this incident, the vehicle had previously undergone an oil consumption test related to engine concerns before the recall campaign. This failure occurred shortly after the vehicle was inspected and cleared under the recall procedure. I am reporting this due to the sudden loss of propulsion at highway speed following recall inspection and the subsequent need for complete engine replacement.

My vehicle will not go in reverse.

My 2023 chevy Suburban high country had the l87 engine loss of propulsion (related field action: see special coverage n252494003) recall performed on it and completed on August 15, 2025. Higher viscosity oil was put in. This was at approximately 55,000 miles. While driving on the highway at 60mph on December 29, 2025 the vehicle twice lost propulsion and indicated the vehicle needed to be restarted. I took it to a chevy dealer to have looked at in early January 2026 and they could find no issues or codes. On January 31, 2026 while driving on the hwy at 75 miles per hour the vehicle started to rattle and it lost propulsion. The dic indicatd "system failure" and I had to pull off to the shoulder of the highway. The dic repeated "system failure" and that the vehicle needed to be restarted. The vehicle would not restart when attempting to press the brake and restart. This happened on a busy interstate and the safety and well being of my family inside was put at a risk that could have been avoided, likely if the engine would have been replaced in August of 2025. The temperature outside was in the single digits and there was no air pushing through the vehicle while we waited for a tow truck and another family member to pick us up off the highway. There was no warning lights or messages prior to this happening. The vehicle is currenlty undergoing diagnostic testing at a chevy dealership. This happened at 69,000 miles. This is highly concerning that this could happen in a 95,000 dollar vehicle. This is absolutely a saftey risk. I'm lucky I was able to merge on the interstate in a vehicle that could not maintain the speed with traffic and pull off to the shoulder.