2018 Chevrolet Suburban transmission problems

Filed Oct 9, 2026 · Transmission · WA

My 2018 Chevrolet Suburban is experiencing transmission problems that raise serious concerns about the reliability and potential safety of General Motors transmissions used in trucks and SUVs from this period. When I contacted an independent transmission repair shop to describe the problems, the employee immediately asked whether my vehicle was a 2014–2018 model. When I confirmed it was a 2018 Suburban, she explained that the shop encounters transmission problems in these vehicles regularly. Her familiarity with the issue, before even inspecting my vehicle, was particularly concerning. This is now the second 2018 General Motors vehicle in my household to experience significant transmission problems. My 2018 GMC Sierra previously suffered a complete transmission failure despite remaining substantially below its warranty mileage threshold. General Motors declined financial assistance because the warranty's time limitation had expired. I recognize that these are two separate vehicles and that the mechanical cause of the Suburban's current symptoms has not yet been independently confirmed. However, the recurrence of transmission problems, the repair shop's observations, and publicly reported complaints involving GM trucks and SUVs from this period warrant further investigation. I am concerned that transmission defects could cause unexpected hesitation, slipping, loss of propulsion, or unpredictable shifting, potentially creating dangerous driving conditions. I am not claiming that all these conditions have occurred in my Suburban, but I believe the potential safety implications deserve examination. I request that the federal safety agency investigate whether these vehicles exhibit recurring transmission defects, review relevant manufacturer technical service bulletins and consumer complaints, and determine whether additional corrective action or a safety recall is warranted.

Filed Oct 8, 2026 · Electrical, Transmission · WA

My suburban shut off 5 times while turning. Very unsafe given I have 4 children and it could have been while we were driving on the freeway, which could have been fatal.

Filed Jun 1, 2026 · Transmission · 108,000 miles · TX

The contact owns a 2018 Chevrolet Suburban. The contact stated while the contact's husband was driving at an undisclosed speed, the accelerator pedal was depressed, however the vehicle failed to accelerate as intended. In addition, the contact's husband noticed an abnormal sound and the vehicle independently stopped. The contact stated that the instrument cluster displayed a blank screen. The contact's husband attempted to shift the gear shifter, however the gear shifter failed to shift as intended. The contact stated after several attempts, the gear shifter shifted as intended. The vehicle was driven to the residence. The vehicle was taken to an independent mechanic where it was diagnosed with a failed transmission. The contact's husband was informed that the transmission needed to be replaced or rebuilt. The vehicle was not repaired. The contact referenced an unknown recall; however, the VIN was not associated with a recall related to the failure. In addition, the contact was informed that the failure was a known failure with the vehicle. The manufacturer was made aware of the failure. The contact was informed that the failure was not covered under the unknown recall. The failure mileage was approximately 108,000.

Filed May 15, 2026 · Transmission · IA

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.

Filed Mar 18, 2026 · Transmission · TX

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 .

Filed Mar 12, 2026 · Engine, Transmission · CA

My 2018 LT Chevy suburban with 110000 miles has been giving me transmission and motor problems. I took it to chevy vannuys and they took 3 days and did nothing. I saw a recall on line for the same year. Explaining about transmission problems. Where can I go to have it fixed.

Filed Dec 17, 2025 · Driver assistance, Transmission · IL

Transmission will not go into drive or reverse. This also happens when car is in drive going down the road it will all of a sudden lose power and not go when pressing gas pedal. Vehicle has to completely shut off several times before it will go back into gear. No warning before it started. This can be dangerous when it happens in traffic and I can’t move car out of the road. It has not been inspected yet. Also blind spot warning does not always says it needs serviced.

Filed Nov 6, 2025 · Transmission · AL

Transmission has to be replaced due to transmission slipping and delayed shifting under heat and prolonged highway driving. This issue also causes SUDDEN hard shifting, hard breaking, shaking of the steering wheel, along with grinding of gears!! This is a safety issue to to no warning signs at all along with a sudden drop in speed and power!! While driving on the interstate or highway this sudden change can cause the vehicles behind you to rear end you or cause a pile up!!! The driver has no control of vehicle when these issues happen!! A loss in control due to shaking of the steering wheel is a huge issue!!! Lack of shifting or hard shifting causes a SUDDEN stop of vehicle with no warning signs while driving!! It is going to cause a crash!!!! These are serious and dangerous issues that Gm will NOT do a recall for!! GM is aware of the issues due to Suburban, Tahoe and Silverado vehicles in the year models 2018-2023 having this reoccurring issue!!! I recall needs to be done to save someone’s life!!!!! I have only had my suburban for 8 months!! I was not made aware of this issue at all!!!!!! This also causes rough idle!!!!!!!!

Filed Jun 22, 2025 · Transmission · MD

I am submitting this complaint to report a recurring and potentially dangerous issue with the transmission in my 2018 Chevrolet Suburban, which I purchased brand new in 2018. At approximately 60,000 miles, I experienced severe transmission issues that led to a complete transmission replacement. Now, at around 133,000 miles, I am encountering the same symptoms once again. The transmission makes a loud clunking noise during acceleration and braking, and shifts gears abruptly and harshly. These symptoms appeared suddenly, with no warning lights or prior alerts. This problem poses a significant safety concern. The vehicle sometimes struggles to accelerate properly, making it dangerous to merge into traffic. Additionally, the forceful shifting makes the vehicle feel unstable and unpredictable, as though something beneath the car might fail while in motion. I transport my husband and our children in this vehicle, and this issue puts all of us at serious risk. I have scheduled another appointment with a GM dealership to inspect the vehicle. However, given that this is a recurring failure involving a critical system, I am requesting that the federal safety agency investigate this matter as a potential defect affecting other owners of the same model. Thank you for your attention to this serious concern.

Filed Apr 30, 2025 · Transmission · SC

My Suburban is having the same issues as the most recent recall on the 2021-2025 Chevrolets. The issue is with pretty much all of the motors that go from the V8 to the 4 cylinders. It's doing the same exact thing a friend of mine's 2019 Tahoe did. It's making a loud knocking/ticking noise. When you first get to going it starts almost sputtering which can cause issues if you're in oncoming traffic trying to cross roads.