The contact owns a 2021 Chevrolet Silverado 1500. The contact stated while driving 60 MPH, the vehicle briefly lost motive power before slamming into gear. There were no warning lights illuminated. The contact stated that on a separate occasion, while driving at an undisclosed speed, an abnormal sound was coming from the transmission. The vehicle was taken to a local dealer; however, no cause for the failure was found. After test-driving the vehicle, the dealer diagnosed that the fuel injectors had failed, and there was a misfire in cylinder #6 had, and the check engine warning light was illuminated. The fuel injectors were replaced. The dealer test drove the vehicle and the failure persisted. The dealer diagnosed the vehicle and stated that the lifter rocker arm had seized. The vehicle was not yet repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 64,000.

- Cle Elum, WA, USA

Transmission jerking violently while driving at low RPM 1000-1500 RPM. Occurs daily. Shudder and vibration as vehicle is slowed approaching stops. Effect and feeling is unsettling to driver and passengers. Can be recreated but is also intermittent at times. Dealer has avoided fixing as it is not 100% consistent. Asking me to drive until failure which is unsafe and could lead to accident or stranding.

- Lake Elmo, MN, USA

The transmission either shifts hard or momentarily locks up when downshifting and then shifting back up into high at 50+ mph. Check engine light comes on, tow haul mode is not available, engine rpm's increase dramatically. Transmission will begin shifting normally after a engine stop, but check engine light stays on, and tow haul mode is not available. Cycle continues. The hard shift before the check engine light comes on and transmission upper gears are locked out is very unnerving, especially with a travel trailer behind you at 65 mph. I no longer fell safe driving the vehicle. I am requesting assistance from the dealership on this truck with less than 49000 miles. The "flash for the transmission" recall was done several thousand miles ago. It only masks the situation. This is not acceptable, nor safe.

- Jacksboro, TX, USA

Transmission isssues hard shifting and no shifting at times. I informed the dealership about the recall on this issue and they are saying it doesn-??t fall under the recall which isn-??t true because my vehicles is showing all of the symptoms under the recall #N242454440.

- Charlotte , NC, USA

Transmission issues, rough shifting, hesitation and shuddering.

- Woodbridge, VA, USA

Transmission sometimes does not change out correctly, when I show down it shifts really hard, and and now the rear wheels are locking up which increase the likelihood of an accident

- Gardendale, AL, USA

The transmission valves failed and torque converter clutch slipped causing the truck to have harsh shifting issues, acceleration issues, and wheel-lock up. I've had to replace my full transmission and receive a new torque converter clutch, reprogrammed.

- Yulee, FL, USA

The transmission on my truck failed. My truck now requires a new transmission. A repair costing over $7000. The transmission gave out while pulling into a street with my wife and child in the car. The truck would struggle to go into gear and lurch violently. The dealer was able to replicate these problems.

- Kennesaw , GA, USA

The transmission is the problem. The truck shudders. I took it to a mechanic, David Gessel's Auto Service 863-401-2860. The mechanic serviced the transmission and informed me that the transmission will need to be replaced eventually and that the torque converter is coming apart. It seems like the same issues 2019 transmissions in Chevys were having. My transmission is an automatic 8speed. The service performed fixed the problem of shuddering but now the truck is doing it again.

- Dundee, FL, USA

The automatic transmission appears to be going out. Hard shifting occurs when speeding up or slowing down along with loud thuds and jerks. No warning lamps have come on, I will be taking it to a shop to have the transmission fixed.

- Moriarty, NM, USA

Vehicle feels like it's hitting a bump down the road 65 miles an hour. There is no bump it's the transmission. My truck has 80240

- San Antonio, TX, USA

Engine Seized up on me while driving on the freeway. Four of the crankshaft bearings seized up and one of those four completely melted. good thing the freeway I was on was not too crowded, my dash just all of a sudden lit up saying shift to neutral to restart engine. I was able to get to the shoulder. I tried re starting the engine and nothing happened. I had it towed to Simpson Chevrolet in Irvine CA. they reported back to me and said Engine has seized and I will need a new engine, cost of $16,893. I cannot afford a new engine right now and have been left without a vehicle. GM has taken no responsibility for this failure even though all maintenance has been performed on time every time.

- Lake Forest, CA, USA

The contact owns a 2021 Chevrolet Silverado 1500. The contact stated that during cold starts, the transmission was slipping, jerking, and banging. The failure eventually worsened and began to occur after the vehicle was driven and was warmed up. Additionally, while decelerating, the vehicle erroneously lurched forward. The vehicle was taken to the local dealer who diagnosed that the transmission valve body was faulty and needed to be replaced. The vehicle was not yet repaired. The manufacturer was notified of the failure. The failure mileage was 6,000.

- Grovertown, IN, USA

Transmission Overheating and Jerking

- Casa Grande , AZ, USA

While coming to a stop at the end of the exit ramp my vehicle bucked when trying to go from a stop into 1st gear. Eventually the truck continued in a forward motion. Then came to a stop light and once again from a stopped position by truck bucked and eventually went into gear and continued forward motion. Parked the car where it sat for 1.5 hours then went to drive the vehicle and it bucked again into 1st gear. Drove to a parking lot were we parked to get lunch. Came out started the vehicle backed out of the parking spot and drove forward to the exit of the parking lot. When trying to exit the vehicle failed to move forward. The car acted as if it was in neutral and only revving to high RPM's. Removing the fuse for the Transmission Control Ignition allowed the vehicle to move forward but only in gears 1,2,3. I brought the vehicle to GMC dealership and they recommended a fluid service to determine if metal chips are in the fluid. That service was performed and issue remained. The Dealer has recommended a complete transmission replacement. My vehicle never displayed a warning lamp or shown symptoms prior to this failure. My vehicle has a 8 speed transmission which is known to be a failing part with Chevrolet and GMC. A new transmission is costing me $7900 plus tax on a 2021 with low wear and highway use.

- Middlebury, CT, USA

No check engine light, and my transmission didn't engage gear. I left vehicle off for the night, started it and it worked perfectly fine. Still, no check engine light was on.

- Houston , TX, USA

Drove my truck home for lunch. Truck drove normal all morning with no warning lights or audible warnings. Went to leave and head back to work. Put my truck in reverse and it would not move. Still no warning lights or audible warnings. After looking online it said that this was common in the Chevrolet speed transmission. It also says the valve body was bad. They also stated that it could lock up the transmission and cause an accident. Luckily I was not driving down the road to find out. When talking with a Chevrolet dealership they told me that the parts to fix the transmission is on backorder. They also stated that the parts may not be available for months. Because the Chevrolet dealership had other Chevrolet vehicles in with the 10 speed transmission with the same issues and could not get parts because of the valve body being on backorder. They also said that the whole transmission being on backorder. This sounds like it's a common problem with Chevrolet 10 speed transmissions.

- Wellington, KS, USA

2021 Chevrolet Silverado Trail Boss with transmission valve body problem. Truck nearly stalled while driving and towing my boat then a huge clunk in the transmission. The truck then rapidly accelerated, down shifted, brief wheel lock up and I was nearly sent in to the ditch with my trailer now swaying behind me. The entire situation felt extremely unsafe and dangerous to both me and oncoming traffic. The check engine light was then on and the truck went in to limp mode. The truck would also no longer go into reverse. I first brought the truck in in October. They finally diagnosied the problem on November 4th, 2024. It is now February 14, 2025 and GM can still not provide me and ETA for the part or for repair. I've opened a service ticket with GM and asked for a buyback as I do not feel safe driving this vehicle any longer. I still do not have resolution with GM or my local dealership.

- Marquette, MI, USA

My 2021 Chevy jerks and jumps into gear when putting it into drive from park. This has resulted in the truck jetting off uncontrollably. This has happend several times going back to 2021 but Chevy will not do anything about it.

- Midlothian, TX, USA

While driving vehicle pulling out into an intersection lost power do to Transmission failure (valve control body). Truck was towed to a Chevy Dealer and was confirmed transmission failure. There was no warning or symptoms prior to this incident.

- Palatine Bridge, NY, USA