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.
2021 Chevrolet Silverado 1500 transmission complaints
Page 7 of 9: complaints 161 to 190 of 245, newest first, as owners wrote them.
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.
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.
I have a 2021 Chevy Silverado 1500 Custom crew cab truck with an 8-speed transmission. I have had transmission issues for a few months. I am experiencing hard shifting from 2nd gear down to 1st gear, slipping while at cruising speed, shuddering between 20mph-50mph, transmission getting too hot. I was told by an automotive shop that they experienced the hard shifting and that they also heard a whining sound while driving. They told me that they a found a Service Bulletin that came out in December of 2024, that there could be a pinched line on top of the transmission that could be causing the overheating. I have read that the transmission control module needs to be reprogrammed, a fluid flush and refill, the Thermal Bypass Valve could be at fault. Basically everything that has been released about the transmissions on 2020- 2024 GM vehicles as being safety problems, I am experiencing. I have checked my VIN on the federal safety agency website and also with a dealership, and both show that there is not a recall for my VIN. I do not tow anything, just normal ever day driving. I now have 90,000 miles on the truck and the issue first happened at around 87,000 miles. The issues with this truck are clearly manufacturer defaults and something should be done on their dime, not mine. The first time that I experienced the problems was at the end of November in traffic, which a hard shift into 1st gear, felt like I was hit from behind, but was not. Dash lights came on (traction control light, parking brake light, check engine light) and the truck went into "Limp Mode". I was able to exit the highway and get into a parking lot. I looked in the owners manual and found a quick solution and was able to regain power and all lights went off except for the check engine light. Got the code checked and it came up Transmission Control Module was potentially the issue. Code was cleared and didn't have the problem for a long time.
The contact owns a 2021 Chevrolet Silverado 1500. The contact stated that while shifting into park(P), the vehicle failed to recognize that the vehicle was in park(P). The contact stated that the "Shift to Park" message was displayed on the instrument panel. The contact was forced to move the gear shifter back and forth between gears before the correct gear was recognized. The vehicle was initially taken to a dealer; however, the dealer failed to duplicate the failure. The failure persisted and the vehicle was taken back to the dealer, and it was discovered that the transmission control module had short circuited and needed to be replaced. The vehicle was not yet repaired. The manufacturer was not notified of the failure. The failure mileage was 41,000.
2021 Silverado LT Trail Boss 6.2 (production date: 01/2021) was taken to the GM/Chevy dealer (Ed Morse Chevrolet) on 01/29/2024. It was confirmed by the GM mechanic that the engine had failed (75k miles) due to a shattered camshaft and metal in the engine and a complete engine replacement is needed. Had prior complaint at around 6k miles for engine noise along with hard shifts and a check engine light that had appeared then went away on its own (documented). I was told by a GM certified dealership, it was normal in the new trucks and no action was taken. Unsatisfied, I made another appointment for a second opinion and only regular maintenance service was suggested and performed several days after, at a GM certified dealership. All oil changes have been performed in a timely manner. No forewarning prior to engine failure to include check engine light or any system messages, although trucks performance from the initial complaint did not subside. To my knowledge, this vehicles engine is weighing heavy on consumers safety with engine failure and is a well documented issue, leaving many stranded. Thank you!
The truck jerks when first driving and will jerk and lundge at various times and speeds. There is a almost grinding nosie. It often says "Reduced Engine Power" and the engine light comes one, the "Service ESC" notice comes on with the vehicle light, when this happens the truck will barely accelerate even if flooring the gas, continues to make a grinding noise. This happens frequently, but then lights go away, then come back on. Dealership pulled multiple codes (image attached). This is a huge safety risk due to failure of acceleration, and the jerking that causes the truck to jerk while in motion and slow.
With absolutely no warning, the 6.2 liter V-8 engine with 28,500 miles on it seized up solid and would not run. I was stranded in heavy Christmas traffic and completely blocked one lane. It was an unsafe situation. I had to summon a wrecker to come and tow the vehicle, and I called 911 for police presence to alert and direct traffic. The vehicle was at the Chevy dealer for a month while they installed a new engine. The dealer never fully confirmed what the cause was - I don't believe they really know - and I only have 10 months of warranty left. I am concerned about another failure and thought I should at least get the warranty on the new engine re-set to 60,00 or more miles.
The contact owns a 2021 Chevrolet Silverado 1500. The contact stated while driving from a complete stop, the transmission was slipping between the third and fourth gears. The contact stated that the failure recurred while driving between the sixth and seventh gears. There was no warning light illuminated. The vehicle was taken to the dealer, where it was diagnosed that the transmission had failed due to the TCM and torque converter failure; however, the parts were not available to repair the vehicle. The vehicle was not repaired. The manufacturer was notified of the failure and a case was filed. The failure mileage was approximately 95,000.
At 4K miles, the lifters of the engine went bad. It was determined a rod was bent and had to be replaced. At 26K miles, another cylinder went bad and had to be replaced. At 40Kmiles, serpentine belt had to be replaced. At 41K miles, another cylinder went bad and had to be replaced. Now, at 55K miles, I am getting the same issues with loss of power, engines stuttering and misfiring and will be taking the truck to the dealer on 1/28/25.
Lifter failure at 8629 miles. All warning lights went on at time of incident, truck would barely drive home and I had it towed into the dealership where they replaced the entire bank of lifters. This is on my repair order- "Checked and found dead mis on cylinder 4 and ticking noise from engine//performed compression test and found no compression on cylinder 4//removed passenger side cylinder head and found lifter bad causing push rod to bend//replaced all lifters on right bank and 1 pushrod//changed oil and filter//filled coolant and test drove and found all ok. I called Chevy at time of incident (1/21/22) and opened case# 9-7252876703 stating I wanted both banks of lifters replaced because I pull a 30' camper with my family and didn't want the other side to fail while I'm pulling 7000+ pounds. They declined to replace the other bank stating that since the vehicle had more than 5000 miles it did not qualify for both sides to be replaced and it was for only vehicles after 11/21 and mine was built 2/21. I still would like to get the other bank of lifters replaced under warranty.
I have just been made aware that there is a lot going on right now with the l87 6.2 motor. I purchased my truck last September so I e had it almost a year 1/2. I recently started having what seems like a misfire issue as of 1/20/2025. I have it scheduled to be checked out Friday 1/24/2025. I’m just reporting this to cover my back if any recall or anything comes about. In addition I’ve had regular oil changes and maintenance on the truck. It’s currently inspected and insured.
Vehicle is shuttering while driving, vibrating at different speeds and it feels like the wheels are locking.
Vehicle has less than 35k miles. Vehicle started and operated normally Attempted to turn onto main thoroughfare from a stop. While still in drive, vehicle engine rev’d up but transmission did not engage. Attempted to cycle through gear selector with same result. Reverse is the only gear that allowed vehicle movement. Serious safety concern if this were to happen while traveling at any significant speed or if trying to merge or cross heavy traffic. Vehicle has not had an official diagnosis, but I believe this is a transmission valve body problem known to the manufacturer. There was no indication prior to this event of any mechanical or electrical problems with the vehicle. This issue could easily get someone killed.
The 8-speed automatic transmission (8L90) has been failing. It has put me in my passengers safety at risk because my truck can lurch forward without warning due to delayed downshifting and RPM surge. Yes, the dealership has confirmed this issue multiple times. The component has been inspected by the dealership multiple times. Yes, check engine light came on and yes there was symptoms before the failure such as lurching jerking, surging harsh and erratic shifting. They first appeared at 55,000, MI. It continues to happen to this day. I have an appointment scheduled for today at 9:20 a.m. for the dealership to look at it again but this is a legitimate concern.
When putting vehicle in PARK and releasing the foot brake it rolls back an excessive amount of space sometimes it rolls back so much we begin to get scared thinking we are still in DRIVE and jump back in vehicle just to learn we are in PARK. We have had this issue since the day of getting truck in August of 2024 and how much it rolls back is never consistent on the length of the roll back. Sometimes it feels like it make even slip out of gear and just keeping rolling. It’s very scary and we have almost knocked ourselves out when it happens trying to jump back in to stop it.
On January 6 and 7, 2025, the broken transmission valve body was subjected to inspection by a Chevrolet dealership. The vehicle exhibited faulty gear shifts, which resulted in reduced speeds and triggered the activation of "limp mode." This malfunction occurred while driving under severe winter storm conditions, posing a potential risk for serious injury. The issue was methodically diagnosed and documented for parts replacement. Furthermore, the transmission service indicator activated via the associated application, and the check engine light illuminated alongside a blinking "D" mode indicator at the time the warning lights were activated. The initial signs and symptoms of the issue were first observed at 11:00 PM on January 5, 2025.
Valve body went out at 52,000 miles and was replaced under warranty. Went out again at 104,000 miles, has been at dealer for a month now waiting on part that is unavailable
The contact owns a 2021 Chevrolet Silverado 1500. The contact stated that while driving 10 MPH, the vehicle hesitated and shifted into another unknown gear independently. The vehicle was taken to the dealer where it was diagnosed that the transmission torque converter and the valve body needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure when a case was opened and escalated the matter to a higher supervisor. The failure mileage was 61,200.
The transmission in this truck has been an issue since it had 50k miles on it. It doesn’t shift correctly or smooth at all. It shifts hard, slow to engage, studders, jerks, pops without any load. This is my second 2021 Chevrolet Silverado 1500 with same issue except it needed transmission replaced and didn’t know when they’d get another transmission in as they’re on backorder and these are work truck and can’t be down long - dealer said this is a common issue with these trucks - so I got rid of that one. If the dealers know this is a common issues and attorneys are sending letter for class action lawsuit against GM this should tell you something- recall them! No lights have ever come on with any warning on either truck.
Open recall with no remedy. Called GM and they cannot give me any timeframe as far as when a fix will be available. GM has proposed changing the software to limit the truck to fifth gear if excessive wear of the valve is detected but that is not a fix for the issue and they cannot even give a timeframe for that or what they will do to remedy the issue when there is excessive wear. The issue can cause the rear wheels to lock up while driving and is a major safety issue compounded with winter driving conditions yet GM cannot provide any information. I cannot even replace the vehicle as the vehicle cannot be sold in my state of Missouri with an open recall.
The contact owns a 2021 Chevrolet Silverado 1500. The contact stated while driving at an undisclosed speed, the vehicle became difficult to maneuver and the rear wheels were intermittently inoperable with the transmission experiencing hard downshifting. The failure occurred on several occasions. No warning light was illuminated. The vehicle was taken back to the residence. The contact researched and was made aware of an undisclosed the federal safety agency Campaign; however, the VIN was not included. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure. The failure mileage was approximately 30,000.
MY Windshield wipers stop working on low and high and from time to time my vehicle will not go in reverse. when it does finally go in reverse it's a very hard jerk, also when I'm driving it gets a drag an acts like it wants to stop going. It happens frequently and it has been going on for months.
UNKNOWN - The truck began jerking/braking on its own while driving last week. I took it to a local transmission shop where it has sat for the past week as they said the transmission control module/tcm needs to be replaced but the part needed is on back order. This issue sounds similar to the recent transmission recall (N242454440) though our vin does not show there to be a recall on our exact vehicle. Our truck meets the specifications of the recall and having it inoperable has placed a hardship on my family. How can I get it fixed under this recall at a local GM dealer?
Transmission failed. Safety was put at risk for me and others, truck started jerking. The problem has been confirmed by a dealer and has been at a dealership since June 2024, it is now almost December 2024. They were waiting on a new transmission to come in due to these transmissions were put on back order. There were no warning lamps or messages on dash. The truck just started jerking while driving and it was very unsafe to drive. We had to have truck towed to dealership.
Transmission issues such as vibration/grinding, delayed shifting, rough shifting, clunking noises when changing gears, jerking sensations, vehicle is available for inspection. The transmission control valve may fail, causing the rear wheels to lock up. Transmission was inspected, Dealer claimed Torque converter issue and replaced that part, however, ISSUE still exists and Dealer claims that at the 2nd inspection, it was the tires giving me the rough shifting and vibration/griding I feel when driving. No warning messages, just continued vibration that turned into grinding at it continues to get worse. Issue started at 55K miles, truck currently has 60K miles, torque converter was replaced at 58K miles. The issues seems to be the same as the current GMC Diesel transmission recall. This recall SHOULD pertain the Gas Transmissions for the same year vehicles.
The transmission jerks from time and time. There is a lag between shifting and first and second gear
My truck has less than 50,000 miles on it and the transmission feels has if it's shifting hard and shuttering during the cycles of first to third. I do not see that my truck has a recall, but if there is a problem with my trucks transmission, then I need to have it looked at before the 60, 000 or 5 year warranty expires. Can I just take it to a Chevy dealership and have this inspected at NO CHARGE to me?
The contact owns a 2021 Chevrolet Silverado 1500. The contact stated while driving 55 MPH and passing another vehicle, the rear wheels inadvertently locked-up momentarily, causing the vehicle to momentarily shudder and to downshift to second gear while the RMPS revved significantly. There was no warning light illuminated. The contact was able to continue driving. The contact stated that the failure had been recurring while driving. The vehicle was taken to the dealer several times. The dealer replaced the knock sensor; however, the failure persisted. The vehicle was taken back to the dealer, where the failure recurred while the vehicle was being test-driven; however, the dealer was unable to diagnose the vehicle. The vehicle was not diagnosed or repaired. The contact later became aware that the VIN was included in the federal safety agency Campaign Number: 24V097000(Power Train), which the contact related to the failure; however, the part to do the recall repair was not yet available. The local dealer was contacted. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the failure. The failure mileage was approximately 106,000. VIN tool confirms parts not available.
Vehicle began to lose power on the highway almost causing a collision due to the low speeds I had to travel. My vehicle was taken to a local Chevrolet Dealership and was told I had bad lifters and a bent rod. I was told this is a common issue with newer mold Chevrolet Silverado’s .
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