2020 Chevrolet Silverado Powertrain & Transmission Problems

Vehicle: 2020 Chevrolet Silverado 1500 4x4 LT (5.3L V8 Engine) Component: Engine (Piston Rings, Lifters, and Motor Assembly) / Powertrain Component Availability: Yes, the failed components/vehicle are available for inspection upon request. What Happened and Safety Risk: While operating the vehicle on Prince Street in Clovis, NM, the engine suddenly began knocking violently without any prior warning or symptoms. Immediately following the mechanical failure, dashboard warning lights illuminated (including the Check Engine light, ABS, and Traction Control) and the vehicle dropped into "Reduced Engine Power" mode. This caused an immediate and hazardous loss of acceleration on an active roadway, forcing an emergency maneuver to navigate out of traffic and pull over safely. This sudden powertrain failure poses an unreasonable and severe safety risk to the driver and surrounding traffic. Confirmation and Inspections: The mechanical failure has been confirmed and diagnosed by Hamilton Chevy in Portales, New Mexico, and Sanders Repair Services in Portales, New Mexico. The vehicle and components have not been inspected by the manufacturer, police, or insurance representatives. There were no warning lamps, messages, or symptoms of any kind prior to the sudden failure.

The contact owns a 2020 Chevrolet Silverado 1500. The contact stated that while driving at approximately 40 MPH, the vehicle shuddered and downshifted independently. No warning lights illuminated. Additionally, an OBD2 diagnostic scan retrieved diagnostic trouble codes: U0146, U0101, and U0100. A local dealer was contacted; however, the vehicle was not diagnosed or repaired because the VIN was not included in any recall. Additionally, the contact related the failure to NHTSA Campaign Number: 24V797000 (Power Train). The manufacturer was not made aware of the failure. The failure mileage was approximately 84,000.

Transmission shudder/rumble strip vibration when accelerating

While driving at highway speed, my vehicle developed a serious transmission problem. At approximately 75 mph, it suddenly lost the ability to maintain speed and dropped to about 55 mph despite throttle input. Engine RPM increased significantly and the vehicle had greatly reduced propulsion. Normal operation temporarily returned after the vehicle was shut off and restarted. The vehicle has also experienced harsh shifting, vibration, limp-mode behavior, a check-engine light, and I reported a momentary wheel-lock event. These symptoms create a safety concern because an unexpected loss of propulsion or abnormal transmission behavior at freeway speeds can increase the risk of a collision. The vehicle was inspected by an authorized Chevrolet dealer. The dealer documented transmission-related diagnostic codes including P0700, P0970, P0968, and P0711. The dealer's repair order specifically referenced GM program N242454441-03, described transmission control-valve wear and pressure loss, and recommended replacement of the valve body. A separate repair estimate included the valve-body assembly and related transmission service parts. Despite the dealer recommending valve-body replacement, GM/dealer coverage was denied primarily because P0747 was not present at the time of diagnosis. I am reporting this because I am concerned that transmission control-valve/valve-body deterioration may cause harsh shifting, reduced propulsion, limp mode, or other safety-related symptoms before or without P0747 being stored. I am asking NHTSA to review whether vehicles with the same underlying valve-body failure may remain on the road because the specific qualifying diagnostic code is not present during a dealer scan. The vehicle and transmission are available for further inspection if requested.

GM has a known recall and special coverage N242454441 to cover the exact same issue I experienced on my way home from work. However, I am informed my model is not included in this special coverage. The issue I experienced while attempting to turn into my apartment complex on a busy road [XXX] my rear wheels locked up mid turn no warning signs, no lamps, no messages or other symptoms were present. Almost causing me to get into an accident had traffic not stopped. I was able to shift it into park and then to drive to immediately pull off to the side into a parking lot and put my OBD reader I have P0747 solenoid 1 failed locked on. I was informed by GM that they could attempt to reprogram the transmission control model, however based on research this is not the root cause of the issue it is due to the soft aluminum bores causing the transmission module to ware and fail. I have a service appointment on 6-12-26 at 10 am at Bill Cramer GM in Panama City, FL INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

See attached document for complaint.

While driving my truck it started flashing all the service lights on the dash, and then started shaking bad and making a loud ratcheting noise from the transfer case/transmission and a loud knock/tick from the engine. I scanned for codes and it has all loss of communication codes for engine/transmission/transfer case/brakes/steering

Transmission failed before 100,000 miles. All service was complete throughout the life of the vehicle. Problems shifting to next gear causing pulling or slipping on the vehicle. If not able to accelerate properly could cause a safety concern on the road. Repairs were made costing $9,000.

Torque converter disintegrating, metal contamination in transmission fluid.

Our truck started hard shifting and lurching almost a year ago, the check engine light will come on, sometimes the truck will go into safety mode, then the check engine will be off. The problem progressed and we had it diagnosed as a bad transmission control valve which we were made aware is not available to get replaced because of the ongoing recall on other vehicles in the same year range as ours, just not ours specifically. We need to get this fixed and if others are getting it fixed on recall ours should be as well. Otherwise we have a barely usable vehicle, that my husband relies on to get to work, sometimes hours from home, with no way to fix it, a year left of payments, and diminished value because of the transmission issue...that again others are getting fixed at no cost to them. Even without the recall we can't get it fixed because all available parts are going towards the recall. We deserve to have our vehicle added to this recall so we can get in line to fix it. We have been loyal customers for over 20 years to our local dealership Rydell Cheverolet. The incident date is ongoing for over a year but I will put in the most recent date where my husband was almost stranded 300 miles from home.

I had transmission serviced 9 months ago. Transmission has always shifted hard ( like it was going to shift up to next gear , but then downshift back ) Had serviced and a transmissiom check 5/21/26 and now saying I need it replaced. Truck has 106,000 miles. I’ve heard so many reports of Chevy Silverado transmission going out right after 100,000 miles. If it’s a common problem , I feel GM should recall and repair/replace.

Transmission is starting to shudder when maintaining 40-45 mph and will have to let off the gas or accelerate for the gear to shift.

I purchased this vehicle from Ghent Chevrolet in Greeley Colorado, since I have owned the vehicle I have had several transmission problems which caused the vehicle to stick in fourth gear and I have also have issues with the transmission violently shifting into first gear to the point it feels like I’ve been rear ended. I have had to replace the entire wiring harness and the water pump module as well as the thermostat module and the louvres in the front of the vehicle. I have service records for the vehicle for all the repairs and that state the amount of repairs has far exceeded the value of the vehicle and I’m currently having transmission issues again. Please help me find some sort of resolution to this situation! I have already tried to use and was rejected from the Colorado lemon law

Transmission shutter had to have torque converter replaced aug of last year and valve body may of this year replaced on the 8l90. Which has a know issue with 2015-2019 but i have the same problem those years are having

The defective manufacturer lifters on my 2020 Chevrolet Silverado 1500 went on my truck damaging the lifters, camshaft, oil pump and I'm sure more than that. I know it's an ongoing investigation/lawsuit with General Motors, but they need to held accountable and should fix this issue free of charge. Not everyone has $5k-$10k+ to repair their engine due to their negligence. Thank you

The contact owns a 2020 Chevrolet Silverado 1500. The contact stated that while driving at an undisclosed speed, the vehicle jerked forward extremely hard. The power train warning light was illuminated. The vehicle was driven to the residence. Additionally, the vehicle failed to exceed 60 MPH while driving. The vehicle was not diagnosed or repaired by an independent mechanic or a dealer. The contact stated that the failure was a known failure with the vehicle. The manufacturer was not made aware of the failure. The failure mileage was approximately 143,000.

I had been driving my truck for multiple days, after a knocking sound suddenly started from under the hood. It was evident at any speed that wasn't idle. There were no check engine lights displayed on the dash. The sound was annoying enough that I took it in. According to the dealer technician, the transmission pump "completely detached" and was "rolling around inside the transmission." They found metal fragments in the transmission fluid, and they declared the transmission a total loss. I have no idea how my truck was still driving, but if the transmission really had failed so catastrophically, I was driving a ticking time bomb. What if it decided to completely give out while driving my kids to school as soon as I made a left turn across traffic?

Was driving vehicle and it revved very high and then got stuck in a single gear. MPG have also been impacted as of late. GM saying VIN isnt under the valve body recall, but dealer has determined the valve body needs to be replaced.

The contact owns a 2020 Chevrolet Silverado 1500. The contact stated that while driving at an undisclosed speed, the RPM became extremely elevated. The accelerator pedal was depressed; however, the vehicle failed to respond. The vehicle was turned off and restarted. No warning lights were illuminated. The vehicle was towed to the local dealer, where it was diagnosed and it was determined that the torque converter was inoperable, and that the transmission needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline. The approximate failure mileage was 80,000.

Problem#1 :The transmission shits erratically and down shifts really hard and has a vibration going down the highway. Problem #2: The rear-end differential seems to lock up when turning sharp corners.