2020 Chevrolet Silverado 1500: harsh or hard shifting

Filed Nov 5, 2026 · Electrical, Transmission · FL

Q1: While driving my vehicle it started shifting very violently kind-of out of nowhere, without notice and did not resolve. This and many other factors, such as the diagnostic data retrieved from a nearby auto-parts store, lead me to believe this is likely due to an unresolved re-call on the vehicle that I just started receiving in the mail, the TCM Valve/Sensor. The vehicle is available for inspection upon request, at George Nahas Chevrolet, located in Wildwood, FL. Q2: My safety and that of others was severely impacted as it was indeterminate when the vehicle would violently over-rev and up or down-shift, while also leaving the possibility for the vehicle to just stall completely or to potentially have a total "rear wheel brake lock-up" scenario, as mentioned in the federal safety agency Re-Call. (N242454440 | RIONL-24V797-0912) This issue left me stranded and the vehicle was towed to a nearby GM Dealership, noted above. Q3: This issue was noted in third-party/independent diagnostic data (available upon request), prior to delivery of the vehicle to the dealership. Additionally, the issue was noted at the GM Dealership after four (4) months of repair attempts. The issue was re-encountered during a test drive when the dealership tried to return the vehicle to me un-repaired, demanding payment w/o invoice. The GM Certified Diesel Technician and I test drove the vehicle and found the issue to be the same or even worse. During this test drive, the GM Diesel Tech noted that the TCM could likely be one of the primary issues causing or contributing to the harsh shifting. Q4: The component was supposedly inspected and replaced by the dealership. However, the federal safety agency Re-Call is still showing as INCOMPLETE and the dealership will not provide me with an invoice or any data regarding this matter. The manufacturer was notified months ago and asked to provide data in relation to this matter, but still no resolution. Please let me know if you can inspect and/or assist in any way. Q5: No

Filed Sep 26, 2026 · Engine, Transmission · TX

Vehicle is hard shifting and has the following error codes. Engine P0700 Transmission Control Moduel Requested, test not passed Transmission P0747 Transmission control solenoid Valve 1 stuck on- Test failed. Warning indicator requested. Very concerned to be driving this vehicle.

Filed Aug 19, 2026 · Fuel system, Transmission · CA

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 the federal safety agency 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.

Filed Jun 1, 2026 · Transmission · ND

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.

Filed Dec 28, 2025 · Electrical, Transmission · PA

Bad shuttering, slow acceleration, clunking noise, check engine light flashing all started while driving home. Took it to a transmission shop and they said it was the TC and transmission. I then called the dealership to see if there was a recall, and looked up any recalls. Since I have had fluid flushed and changed, and still have the problems. This has been an on going problem for a couple of years now. It was just out of warranty for dealership to fix. It started while I was on a highway and had very poor acceleration control.

Filed Sep 14, 2025 · Transmission · MT

Several times my transmission has began to shift hard miss gears while hitting the brakes. Lose of power/hard shifts/ not shifting when it’s supposed to/jerking and or harsh shifting slipping delay in shifting slams into gear check engine light comes on after check engine light is on it continues until codes r deleted and or battery power is disconnected. This is a problem with codes like 0700/0716/0796 for the tranny control system sticking malfunctioning happens several times in the last year about every 3-4 months

Filed Jul 29, 2025 · Transmission · FL

defective 8-speed automatic transmission (RPO MQE, 8L45) in my 2020 Chevrolet Silverado 4x2 (VIN: [XXX] , 102,000 miles), purchased used from CarMax Orlando (6375 S Semoran Blvd, Orlando, FL 32822). The vehicle required a $5,950 repair at AAMCO Winter Haven (1350 6th St NW, Winter Haven, FL 33881) due to persistent transmission issues, including shuddering, jerking, or delayed shifting. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed May 2, 2025 · Engine, Transmission · GA

The vehicle was being used in a normal daily driving routine. I was stopped(fortunately) at a traffic light. The light turned green and I went to proceed and began to press the gas pedal and the engine made a loud pop noise and began to barely stay running. I brought the vehicle to the shop(GM dealership) for diagnosis and repair. The motor had to be rebuilt new camshaft, lifters, etc. The vehicle is also having transmission issues, heavy vibration, hard shifts and constant fluctuations in the rpms while maintaining a set speed. The transmission issue still has not been resolved.

Filed Apr 30, 2025 · Transmission · NC

Transmission slips, jerks, delayed shifting symptoms consistent with technical service bulletins and known recalls on later models. Add that it was purchased new and is still financed

Filed Apr 15, 2025 · Engine · 86,000 miles · MI

The contact owns a 2020 Chevrolet Silverado 1500. The contact stated that while driving 50 MPH and making a turn in the opposite direction, the vehicle lost motive power and there was an abnormal knocking sound coming from the engine. There was no warning light illuminated. The contact was able to pull over to the side of the road. The vehicle failed to restart and was towed to the dealer, where it was diagnosed and determined that the rod and the lifters had failed, causing damages to the upper half of the engine. The dealer replaced the gaskets, the rods, the guides, the lifters, the camshaft, and the transition kit. Additionally, and oil change was performed. The vehicle was not covered under warranty and was repaired at the customer's expense due to the mileage. The contact stated that while driving approximately 65 MPH on another occasion, the vehicle made an abnormally loud clunking sound and lost motive power intermittently. There was no warning light illuminated. The contact pulled over to the side of the road. The contact drove back to the residence. The vehicle was taken back to the dealer, where it was diagnosed with cylinder #8 intake valve failure. The vehicle was repaired at the contact's expense. The manufacturer was notified of the failure and a case was filed for the cylinder #8 intake valve spring replacement. The manufacturer referred the contact to the federal safety agency Hotline to report the failure. The failure mileage was approximately 86,000.

Filed Apr 1, 2025 · Acceleration, Engine · TX

Component/system that failed: The transmission control module in my 2020 Chevrolet Silverado 1500 has malfunctioned. The vehicle has issues with slipping between gears, rough shifting, and hesitation when accelerating. This component has already been inspected and diagnosed by a certified Chevrolet dealership, and the part is currently on backorder. The vehicle is available for further inspection upon request. Safety risk: This issue poses a serious safety risk to myself and others. The gear slipping and delayed response when driving—especially when merging onto highways or changing lanes—creates unpredictable behavior that can lead to an accident. The truck sometimes fails to engage gears properly, which makes it dangerous in traffic situations. Diagnosis confirmation: Yes, the problem has been confirmed by a Chevy dealership service advisor (Jose Diaz), who provided a formal quote and diagnosis for the replacement of the transmission control module. Inspection by others: The vehicle has not been inspected by police or insurance representatives, but Chevrolet Customer Assistance is currently reviewing the case, and I was advised to submit this documentation. Warning lamps or symptoms: There were no warning lamps initially, Symptoms include slipping gears, hesitation when pressing the gas pedal, jerky shifting, and difficulty accelerating smoothly. These symptoms have progressively worsened over time. Additional context: I have learned that many 2020 Chevrolet Silverado trucks have been recalled for the exact same issue, but my VIN is currently not included. I believe this is a manufacturing defect and that my vehicle should be considered for inclusion in the recall or further investigation.

Filed Mar 4, 2025 · Suspension · ID

When the truck was less than 2years and less than 20,000 miles old it developed a clunking noise in the rear suspension. Sounds like 2 heavy pieces of metal softly being knocked together. The dealership inspected it and replaced both rear shocks. The noise was still there. The dealership replaced the left leaf spring assembly. This temporarily eliminated the noise. The noise came back at just under 3 years and 30,000 miles. The dealership inspected, but couldn't find the source of the problem. The noise has only worsened since then, and at a recent visit to the dealership, they could clearly hear the problem. I was told that it is the result of worn cushions between the leaf springs. I'm concerned that the truck may be unsafe. I've been contacted by GM, and at this time they are looking into how to fix it, and who should be responsible for the repair. I can't imagine that mine is the only 2020 Silverado with this problem, and think there must be other reports of a similar nature.