Chevrolet Silverado 2500 transmission problems

POWER TRAIN

While driving at a speed of around 40 mph on a paved city street in Bozeman, MT, I heard and felt a Super loud clunk in my Chevy engine transmission or drive train.. I immediately stopped to see if something ran into the vehicle. No apparent visual damage of any kind. It felt and sounded like like something jammed within the transmission or drive train. The truck has less than 12k miles and has been babied so far. I love the truck. Oil level is normal and nothing leaking underneath..I took it immediately to Billion GMC in Bozeman. They found nothing wrong however the service manager recounted this regarding another customer who described the exact same issue with the same year vehicle and same transmission: Another GMC owner experienced the same symptom before the transmission seized at highway speed and locked the wheels. Because this presents a potential loss-of-control hazard, I am requesting that Chevrolet open a Technical Assistance Center case, document all diagnostic findings in writing, and determine whether the vehicle is safe to operate before returning it to me. The service manager who recounted this event is named Jay.

NHTSA complaint #11758589 — an unverified report by a vehicle owner.

POWER TRAIN

While launching a boat. Truck was in park and boat off the trailer. I was out of truck 30' on the dock reaching for boat rope ( was a single person boat launch). I heard a loud pop and the truck went into the lake till it hit the dock. Several witnesses to this story. Glad I didn't have to go behind the truck to undo my boat winch. I would have been killed.

NHTSA complaint #11757271 — an unverified report by a vehicle owner.

POWER TRAIN

Safety Issue. The raised cruise control speed set button on the steering wheel is prone to being touched when rotating the steering wheel while making sharp turns when driving through parking lots at low speed. If the distance cruise was previously set at say 45 mph the last time it was used, and the set button is very briefly hit upward when rotating the wheel through your hands to the left, it can inadvertently cause the truck to start accelerating to that previously-set speed. The cruise button needs to be programmed such that at certain steering angles it will not respond to inputs. This is very dangerous. I ave had this happen to me at least 5 times. Hitting the brakes stopped the acceleration. I reported it to the dealer as a potential engine surge but they could not reproduce it. I just recently realized what was happening. I believe this can easily be addressed by a steering angle lockout of the button. Other issues: Drivetrain vibrates occasionally and shifts very hard (drivetrain literally slams through gear change) when leaving driving from a stop a slow speeds. Dealer cannot replicate. This diesel truck gets very poor mileage possibly from spending too much time in regeneration mode. Truck is super sensitive to fuel. Mileage varies drastically from fill up to fill up depending upon station. I believe the fuel cetane content affects regeneration in unexpected ways. I buy fuel at name brand stations but mileage varies drastically from vendor to vendor. Mileage average goes down to about 11 mpg much of the time due to time in regeneration. Dealer has no comments. I know HD trucks don't have official mileage ratings but this is just crazy. I drive light on the accelerator. Rarely achieved up to 21 mpg but average mileage runs about 11-12. I believe this to be a fault with these trucks as I have read complaints from many others. The infotainment system frequently loses all audio, including turn signal sound, nav. GM has no fix. Possibly software.

NHTSA complaint #11755555 — an unverified report by a vehicle owner.

POWER TRAIN

I own a 2022 Chevrolet Silverado 2500HD equipped with the 6.6L Duramax diesel engine and Allison-branded 10 speed (10L1000) automatic transmission. VIN: [XXX]. While pulling away from a traffic light and accelerating to approximately 20 to 30 mph, the transmission suddenly began shifting harshly and erratically, experienced delayed engagement, unexpectedly downshifted, and would not shift into overdrive. At the same time, the check engine light illuminated and a Reduced Engine Power warning appeared. There were no warning lights, messages, or transmission symptoms prior to this incident. I pulled into a parking lot for approximately one hour, but when I resumed driving, the same failure occurred again. The transmission malfunction created a safety concern because the vehicle unexpectedly lost normal shifting and power while operating in traffic, making it difficult to accelerate and maintain speed safely. I contacted OnStar, which reported both an engine and transmission fault. I then drove the vehicle to my independent diesel mechanic, who diagnosed a failure of the transmission control valve body caused by an internal solenoid that is not serviceable separately, requiring replacement of the complete transmission control valve body assembly. The repair has been completed, so the original failed component is no longer available for inspection. The failure was confirmed by an independent service center. The vehicle has not been inspected by Chevrolet, law enforcement, or an insurance representative. I contacted General Motors to determine whether my VIN was included in the existing transmission control valve recall and was advised that it is not. I am submitting this complaint because my truck experienced the same symptoms and the same component failure as vehicles covered by the recall, despite my VIN not being included. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA complaint #11755030 — an unverified report by a vehicle owner.

POWER TRAIN

The contact owns a 2023 Chevrolet Silverado 2500. The contact stated that while driving at various speeds, the transmission was slipping. No warning light was illuminated. The vehicle was taken to the dealer, where it was diagnosed with transmission failure. The contact was informed that the transmission needed to be replaced. The vehicle was repaired; however, the failure recurred days later. The vehicle was taken back to the dealer, where it was lifted and inspected, and the contact was informed that no failure was found. The contact stated that the failure persisted. The vehicle was not repaired. The manufacturer was contacted and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 105,000.

NHTSA complaint #11753135 — an unverified report by a vehicle owner.

POWER TRAIN

The contact owns a 2023 Chevrolet Silverado 2500. The contact stated that while driving at various speeds, the transmission was slipping. Additionally, the contact stated that while driving 60-70 MPH, the vehicle stalled. No warning light was illuminated. The contact pulled over to the side of the road. Upon inspection, the contact became aware of a coolant leak underneath the vehicle. The vehicle was towed to the dealer, where it was diagnosed that the turbo coolant inlet had fractured. The part was replaced. Additionally, the dealer determined that the transmission was in working order upon inspection; however, the failure persisted. The vehicle was not repaired. The manufacturer was contacted and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 83,000.

NHTSA complaint #11753138 — an unverified report by a vehicle owner.

POWER TRAIN

First started around 4 to 6000 miles, felt a shuttering between 50 and 65 mph. Shattering lasted from 10 to maybe 30 seconds let off the fuel and reapplied still there on one or two occasions. RPMs were approximately 2000 RPM shattering stopped in our PMs went down to 1500. This is occurred many times taken to a dealership always get same result, no problem found. Problem always occurs just after a transmission shift which I can tell by RPM. When I apply gas shuttering sometimes increases not always. Also noticed that sometimes shifting on a flat surface 65 miles an hour engine will speed up to almost 2000 RPM and when it goes to shift back, I get a clunk or sometimes a shutter normal cruising is about 1500 RPM at 65 mile an hour. I didn’t notice towing an empty trailer about 2600 pounds shattering seemed worse. With no Trailer I sometimes get erratic shifting where RPM goes 1500 to 2000 to 2500 and then back down again then back up again then it can shift all the way back to 1500 RPM still maintaining 65 mph. Also another problem may be connected to transmission, but I have pulled out into traffic pushed on the pedal and it feels like the truck has no power push on the pedal a little bit more still no power and all of a sudden it’s like everything kicks in RPMs, increase rapidly and truck accelerates extremely fast, throwing things off the dash moving things on the floorboard. Sometimes I see that a downshift occurs and RPMs increase other times I see RPM staying right at the 2000 mark and it still occurs almost got rear ended a couple of times. Check engine light has been on one dealership said they pulled over 40 codes. Still they all claim can’t duplicate problem. Yes I agree it is random but with me watching telemeter and County shift points biggest problem area is fourth gear fifth gear and sixth gear.

NHTSA complaint #11752372 — an unverified report by a vehicle owner.

POWER TRAIN

My 10L1000 transmission had a catastrophic failure internally which caused it to rough shift, sudden down shifting, not want to shift into gear at all, and high engine rpm prior to roughly shifting. I took it to the Chevy dealers mechanic the very next business day, only to find out that from the mechanic that this is a common occurrence with Chevy transmissions in my truck and google also verified this to be a common problem. The mechanic from the Chevy dealership also stated that there was larger metal chunks than normal. My truck is available for inspection asap. The manufacturer and vin lookup contradicts the mechanic and google stating no issues or recalls for my transmission. After speaking with the manufacturer, I became highly concerned due to their unwillingness to address the obvious issues known by so many. If I wasn’t such a safe driver and immediately brought it to the mechanic, this could have caused a terrible accident leading to extreme bodily harm or death even. According to a quick google search of the 2021 Chevy 2500 transmission problems and my mechanic this is a well known problem even though Chevy manufacturers refuse to acknowledge the issue or implement a recall. There was zero warning lights or lamps to indicate this problem. I am extremely concerned with the manufacturer’s response to my concerns and their unwillingness to correct this issue before it cost someone their life. This catastrophic failure with the transmission having metal shavings throughout it and extreme damage to the transmission valve body and being well known and reported by many other customers has to be addressed. Chevy’s unwillingness to acknowledge people’s claims in this has left me with around $10,000 in monetary damages and could have lead to bodily harm or death if I would have been traveling on a main highway or interstate when it occurred. At the very least Chevy needs to be held responsible for this known and reported issue before it causes death or injury.

NHTSA complaint #11752243 — an unverified report by a vehicle owner.

POWER TRAIN

2018 Chevy Silverado 2500Diesel Duramax (63,000 miles & Garage kept) While pulling 37' camper on flat terrain, Push Rod bent and broke in half - violently shaking and missing; Engine was ruined. Engine light did not appear until after it started shaking. Luckily this happened before crossing over steep mountain where we would not have been able to get off road or control vehicle and camper behind us. Truck was towed to Chevy dealership; had to wait until 10 days to learn extent of damage. Repair cost was going to be $26,000 and though our truck's trade in value was $37000 before this event, we were offered just $12000 for trade in. Though we had been led to believe that a Chevy Duramax was highly regarded for durability and longevity, we decided to purchase a RAM Truck. NO MORE CHEVYS for us! Contacted Chevy Customer Assistance but because we traded, they would not offer any financial assistance because we took the dealership's offer and traded the next day. We just couldn't stand a $26000 hit on an 8 year old vehicle and had to absorb that amount with our trade in.

NHTSA complaint #11747241 — an unverified report by a vehicle owner.

POWER TRAIN

Transmission Control Valve failed causing my vehicle to drop from 70 miles per hour below 40 miles per hour rapidly on the highway/interstate which could have caused a fatal crash. Called OnStar and was told my code showing was P0747 meaning service now. I called dealerships to get an appt next morning and this happened in the evening and was told the soonest I could get in was a week away, most was longer than that. I did worked in and was told my TCV needed to be replaced. I was told this is a common problem with this truck but when I contacted GM they told me they could only do a 30% courtesy discount because my 2400 Chevy Silverado 2500HD already had 83,000 miles on it and is out of warranty. I have researched this and NHTSA already has a bulletin in place for this same issue but it didn’t include my VIN so they told me there was nothing more than can be done. This is a huge safety risk and concern. My daughter and wife could have been driving my truck and it could have caused a very bad wreck. My vehicle had no prior warning until this happened. My vehicle did say reduced engine performance and my check engine light came on during the event but nothing prior. Now my truck shifts hard and gets hot fast. We opted not to drive and took it to a local dealership for repair due to the risk of injury if we continued to drive it to us and others. We are not put out a vehicle and monthly payment as the part is on back order. GM pretty much is brushing us off and told us we can file a complaint with NHTSA if we feel like it’s something more that needs done. Bulletin number in place for this issue on other VINS is N242454441. I don’t want this to happen to others so I wanted to report it plus I feel like GM should have cover total cost especially with it being a known issue. Thanks

NHTSA complaint #11745093 — an unverified report by a vehicle owner.

POWER TRAIN

The contact owns a 2004 Chevrolet Silverado 2500. The contact stated that while driving 60-65 MPH, the vehicle experienced reduced power and went into LIMP Mode. The contact pulled over to the side of the road. The contact turned off and restarted the vehicle after several minutes, as per the Owner's Manual. The transmission warning light was illuminated. The vehicle was taken to the dealer to be diagnosed. The contact was informed that it could take 1-2 weeks to diagnose the vehicle, and several months to repair the vehicle. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure, and a claim was filed. The failure mileage was approximately 50,000.

NHTSA complaint #11742282 — an unverified report by a vehicle owner.

POWER TRAIN

While driving the vehicle, the vehicle jolted and made a clunk noise. The check engine light came on accompanied by a message on the Dash stating "Reduce acceleration, Drive with Care". The vehicle went into "limp mode", and appeared to be engaged in a single gear. The vehicle was traveling at approximately 30 mph when the transmission malfunctioned. The vehicle was taken to my local Chevy dealer, where they scanned the vehicle and determined that the Valve Body was the issue, based on the scan result. The vehicle is a 2024 Chevy Silverado 2500HD (Gas). It has 29k miles on it. The vehicle was purchased as a "certified Pre-owned" (lease return). Within 20 miles of being driven from the dealer after purchase, I experienced a jolt & clunk. The failure occured 42 miles later.

NHTSA complaint #11729244 — an unverified report by a vehicle owner.

POWER TRAIN

my 2020 Chevrolet Silverado has locked up a couple times on 4/2/26 i immediately drove to the robins chevy dealership, the service writer and i discussed the recall of the transmission, the next day i was sent a estimate of 6800.00 dollars to replace the valve body of the transmission, i asked why am i responsible for the replacement cost due to a known recall of the transmission valve body? i was instructed to call gm directly which i did and no action was taken, i was told to speak to the dealership manager. i need help with this matter.

NHTSA complaint #11729039 — an unverified report by a vehicle owner.

POWER TRAIN

The Transmission on my truck down shifted and made it so I lost all power while driving. If I would have been on the freeway it probably would have killed me or caused a serious accident. It is at a shop waiting to be inspected but they said it was the valve body in the transmission. No warning lights came on at all, and the shop had to plug a computer into my transmission to get the codes. GM needs to make this right because it is going to kill someone or cause harm if a bad accident happens due to failure at freeway speeds.

NHTSA complaint #11727659 — an unverified report by a vehicle owner.

POWER TRAIN

While driving in heavy interstate traffic on March 18, 2026, the vehicle suddenly downshifted hard to 2nd gear, locking the rear wheels and causing the vehicle to slide out of my lane. The truck then entered limp mode and appeared to be stuck in 2nd gear. I immediately called my chevy dealer to make an appointment to drop the truck off. While researching, I found there was a recall for the same vehicle symptoms, but my truck falls outside of the recall. The truck is currently at the dealership for a valve body replacement, due to a KNOWN issue with the Allision transmission where TSB's have been issued. Chevrolet should be more proactive and recall the trucks, and replace the transmissions instead of a bandaid fix, before someone with less driving awareness/experience is involved in an accident

NHTSA complaint #11726825 — an unverified report by a vehicle owner.

POWER TRAIN

Operator of this vehicle was commuting and truck started to slow down and chug. Vehicle hesitated when operator applied gas pedal. -Transmission cooler inlet/outlet pipe as per Chevrolet known issues. -Safety of driver at risk as failure happened in heavy traffic, unable to pull to safety -Yes confirmed by authorized repair facility -Part inspected by authorized mechanic. -No warnings, symptoms, prior to failure.

NHTSA complaint #11725594 — an unverified report by a vehicle owner.

POWER TRAIN

The contact owns a 2024 Chevrolet Silverado 2500. The contact stated that on two occasions while driving at various speeds, the vehicle went into LIMP Mode with an audible chime, and several undisclosed messages displayed on the instrument panel. Due to the failure, the vehicle was turned off, and the battery terminals were disconnected for several minutes before being reconnected. The vehicle resumed to normal functionality and the warning lights independently turned off after driving for a while. The vehicle was taken to an independent mechanic who discovered several diagnostic trouble codes associated with the transmission control module. Neither the dealer nor the manufacturer was notified of the failure. The vehicle was not repaired. The failure mileage was approximately 55,000.

NHTSA complaint #11725574 — an unverified report by a vehicle owner.

POWER TRAIN

The transmission malfunctioned 4 times in the first 3 weeks of ownership. Once on the way home from the dealer, but I could not return as they were closing when I picked up my new 2026 Silverado 2500HD pick up. It has 2 issues so far since that ride home, 2 times, on separate occasions, I was approaching a red light and slowing down when the light changed while I was in a slow speed, so I accelerated to get to the speed limit, while doing so, the truck hesitated for a couple of seconds then banged into gear. The second time for that same scenario was several days after resulting in the same hesitation and then bang into gear. No warning lights were reveled. I called the local Chevy dealership, as instructed by the dealership I purchased it from was 107 miles away, they gave me an appointment to investigate the problem. Upon arriving, I needed to back up to align my vehicle with the entrance to the service area and my truck would not go into reverse. I tried 2 times shifting from park to reverse and nothing, I put it back into park while still running and went into the service area explaining my new issue, the service writer got a mechanic and he tried shifting into park with no luck. He then shut off the engine, waited about 30 seconds, restarted the engine and shifted into reverse and it worked. They checked for codes and none were present, so they test drove it for about 20 minutes, did not experience either symptom and email GM service assistance and were told to have me come back and they would check the parameters and make sure the software was updated as well as the transmission fluid level and condition. I returned for them to accomplish those tasks and drove home, 2 miles, and had no issues till the trip I was going on today, I warmed up the vehicle as it was only 37 degrees today and when I put it in reverse, it did not engage, so I shifted into drive, it engaged then I put it in reverse and it did finally engage. Now I'm going to renotify the dealership

NHTSA complaint #11725430 — an unverified report by a vehicle owner.

POWER TRAIN

Transmission Control Valve Body (Recall #N242454440) ​Your truck is part of the massive recall issued late last year (expanded in February 2026) regarding the 10-speed Allison transmission. ​The Problem: Internal wear in the valve body causes a drop in pressure, which can cause the rear wheels to lock up suddenly while you're driving. Multiple occurrences. It has been taken to the shop for this issue.

NHTSA complaint #11724565 — an unverified report by a vehicle owner.