2018 gmc Seirra 1500 8 speed transmission. Making unsafe conditions while driving transmission tends to make hard shifts, jerks, hesitation when moved into gear, gets worse when stopping momentarily at stop lights and then trying to accelerate vehicle will not move. Makes hard shift and jerks then will accelerate in an unsafe manner.

- Fort Myers, FL, USA

My 2018 gmc 1500 transmission making noise grinding. It only has 75799 Miles on it. I just was told by Laura gmc that my transmission needs replacing. I think gm should cover that. Dealer charging $7800 to replace it. That's not right the truck doesn't have that many miles on it. Please help

- St Louis, MO, USA

Transmission started to shutter at 24000 miles. Dealer said couldn-??t find anything. ABS and Stabilitrack light came on at about 40,000 miles off and on. Both these problems could result in a crash. On freeway or streets. The display information/ radio has a mind of its own. Connects to any phone number or start the on star call and etc. it takes your attention off the road and can result in a crash.

- Houston, TX, USA

Hard changes with transmission like a car has hit you from behind. It has had a hit in the transmission changing gears since 15,000 miles but it has progressively gotten worse and at 67k it-??s enough to knock you to change steering direction.

- Lumberton, NC, USA

The contact owns a 2018 GMC Sierra LD. The contact stated the vehicle experienced jerking and shaking. The contact also stated when the accelerator pedal was applied, the vehicle made a loud noise and lunged. There were no warning lights illuminated. The vehicle was taken to the dealer where a transmission flush and an alignment were performed. However, the contact stated the failure persisted. The manufacturer was notified of the failure and a complaint was filed. The failure mileage was approximately 30,000.

- San Antonio, TX, USA

At 66,963 miles my transmission failed while driving. The check engine light came on and the car would not shift out of first gear. The car was towed into Gilchrist GMC in Tacoma WA. and I was informed I needed a transmission replacement, cost of $7552.24. Come to find out there is a class action lawsuit currently filed for GM owners of this transmission, claiming some 800,000 GM products contain a knowingly faulty transmission. A recall should be in place being that nearly a million vehicles are affected by this.

- Gig Harbor , WA, USA

I have been experiencing ongoing issues with the transmission of the vehicle I purchased in 2018. Despite it being a brand new vehicle with only 10,000 miles, I have had to bring it back to the dealer multiple times for transmission-related problems. We have tried changing the transmission fluid periodically to address the issues with shifting and shuddering, but the problem has persisted throughout my ownership.

- Senoia, GA, USA

I have a 2018 GMC Sierra 1500, it is over 5 years. So we all know our warranties are either expired and meaning out of pocket expenses will come. I mainly drive back and forth to work so my vehicle only 43,924 miles to be exact. So tell me why GM allows us to purchase a vehicle with defect oil in the transmission knowing the Torque converter will start shuttering causing some of us to purchase a new transmission and if we lucky a transmission flush. So yes I took it to the dealership causing me over $850 to have a diagnosis, computer hook up, and a transmission oil flushed and replaced. I was told this is an 45000 miles issue and it's not considered a safety issue. Personally, if I didn't know better I could had gotten rear ended and yes this should be a safety issue. Our family would like this issue addressed and be reimbursed for my expenses. Thank you!

- Elgin, OK, USA

My 2018 Sierra began experiencing severe shuddering while driving down the road. The dealer said it was caused by moisture getting into the transmission fluid and contaminating it. In my ownership of dozens of vehicle's this has never happened before. This formerly inexpensive minor fluid change requirement morphed into a $618 major surgery just to fix a problem that should have never occured. If the fluid was contaminated by moisture as the dealer explained, it's a design defect which caused it and nothing I have ever done. I am still unsure as to if the transmission or torque converter may be damaged. The manufacturer should be liable for the cost to fix this not me!

- Sunrise Beach, MO, USA

The vehicle steering wheel shudders at speeds from 40-55mph. The steering wheel shudders at 2-second intervals and is constant between those speeds. At first, I thought it might be one of the safety systems. It is not. This is unsafe and GM should be held responsible.

- Pensacola, FL, USA

Transmission shudder at different speeds while driving.

- Bridgeport, CT, USA

On approximately July 23, 2023, I noticed the vehicle transmission shifting hard from 1st to 2nd gear and then during the following week, this began to occur every time I drove the vehicle. There were no warning indicators appearing on the vehicle for this problem during vehicle operation. Then at higher steady speeds, the engine RPMs began to suddenly and intermittently surge slightly higher, and the steering wheel would shudder for a few moments. This began to occur more frequently and I became concerned that the transmission would catastrophically fail, causing a crash and/or personal injury. At that point I called a local dealer to make an appointment for a transmission oil change and inspection. The vehicle was taken to a local dealer on August 21, 2023 and they confirmed that there was a problem with the transmission, though at this time final diagnosis is pending. To my knowledge, the vehicle or component has not been inspected by the manufacturer, police, insurance representatives or others since I took it to the dealership on August 21, 2023.

- Bloomfield Hills, MI, USA

The contact owns a 2018 GMC Sierra 1500. The contact stated while driving from a complete stop and depressing the accelerator pedal, the engine revved but the vehicle hesitated to respond. There was no warning light illuminated. The contact stated that the failure reoccurred several times. The vehicle was taken to the local dealer, where it was diagnosed that the transmission was slipping and needed to be replaced. The vehicle was repaired. Additionally, the contact stated while driving 60-65 MPH, the vehicle started vibrating and shuddering. The check engine warning light was illuminated. The contact was able to drive to her nearby destination. The vehicle was towed to a second dealer Liberty Chevrolet (105 Cooley Way, Villa Rica, GA 30180) where it was diagnosed that the driver's side lifters had failed and needed to be replaced. The vehicle was repaired; however, the failure reoccurred. The vehicle was towed to a third dealer, Prince Chevrolet Buick GMC of Albany (2701 Ledo Rd, Albany, GA 31707) where it was diagnosed that passenger's side lifters needed to be replaced. Additionally, the dealer diagnosed that the camshaft needed to be replaced. The contact was advised that the warranty would cover a portion of the cost of the repair and she was responsible for the balance. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 84,267.

- Cuthbert, GA, USA

The contact owns a 2018 GMC Sierra 1500. The contact stated that while depressing the accelerator pedal, the vehicle failed to properly accelerate. The vehicle was towed to the local dealer who diagnosed the vehicle and determined that the transmission was faulty; however, the part needed to fix the vehicle was not available. The vehicle was not repaired. The manufacturer was not yet notified of the failure. The failure mileage was 27,477.

- Garland, TX, USA

When the transmission is making changes, there is a shaking noise.

- Corona, CA, USA

The contact owns a 2018 GMC Sierra 1500. The contact stated while accelerating from a traffic light, the vehicle started hesitating. The contact stated no warning light was illuminated. The vehicle was not diagnosed or repaired. A dealer was not contacted. The manufacturer had not been informed of the failure. The failure mileage was approximately 99,000.

- Mineral Springs, AR, USA

Transmission failure - the GM manufactured Torque converter on my truck failed to cause the transmission to fail. The internet is rife with stories of the failure of these transmissions on 2018 and 2019 GMC and Chevy Trucks.

- Little Rock, AR, USA

8 speed transmission jerking, the torque convertor has been replaced 1 time already and having same issues as before. This time while in parking lot at store, was pulling into parking space, truck lundge forward during hard downshift hitting cart of person walking in front of truck. No damage and luckly barely hit the cart and not the person. I have also had the truck lunge forward when parking in my garage and hitting the garage wall in front. My truck is back at dealer again after hitting the cart in the parking lot. The 8 speed transmission issue from GM is a safety issue. My truck has already had first torque converter replaced and now having same issue with the new torque convertor

- Guysville, OH, USA

noticed ongoing vibration sounds like you are running over rumble lines on road.

- New Kent, VA, USA

The contact owns a 2018 GMC Sierra 1500. The contact stated while driving 50 MPH, the vehicle started shaking and vibrating abnormally. There was no warning light illuminated. The vehicle was taken to the dealer to be diagnosed. The contact was informed that the transmission oil needed to be flushed. The vehicle was not repaired. The manufacturer was not contacted. The failure mileage was 71,000.

- Las Vegas, NV, USA