2023 GMC Sierra 3500 transmission problems

Filed Jul 15, 2026 · Acceleration, Transmission · TX · crash

May 3 2026 was traveling on highway when my 2023 dually duramax wheels locked up on me causing me to hit a guard rail and then truck would not go into any gear and was toast after first dealership it went to was valve body repair and after 1400 dollars it went to another dealer on June 17th to Frank brown for transmission replacement due to failed valve body issue similar to special bulletin n242454441 GMC executive office promised to replace and take Care of me since I am a “valuable customer and instead they lied and went back on their word and left me with another bill of 9,300 dollars for repairs 6200 for transmission and 3000 dollars for labor???? I am feeling like I’m being taken advantage of and need help I’ve lost my job since this has happened and struggling to pay for the truck it’s self but I am maintaining and when they are hoping I get it repossessed so they can get away with not having to deal with my case I’ve gotten under delivered promised and they haven’t helped me at all for something. They are avoiding to admit is an issue when the truck was manufactured and put into sale 10/2022 as for the recalled vehicles from 2019 and 2022 and I continue to tell them this truck was manufactured 2022 they are trying to get away with technical wording when this truck has an safety issue for sure as a consumer and hard working American I need help

Filed May 15, 2026 · Engine, Transmission · TX · crash

While out of Town driving back home Wheel lock up on my 3500hd dually 2023 gmc .. vehicle had shudder effect and from 75 to 25 mph drasticly and engine reduced power light came on and wouldn’t come out of drive and then after stopping vehicle To cement parking safety block the vehicle had multiple codes for valve body and transmission failure relating to the na242454441 issue on previous year models and gmc is not working properly on a resolution but admitting that it is having the exact issue of previous models and with this issue I was promised for full replacement at no cost I am currently working with executive team to help fix the issue that the dealership in Levelland Texas is not honest about what codes are within parameters when infact have A dtc code reader and was able to get a photo and have history of code showing etc

Filed May 8, 2026 · Engine, Transmission · TX · crash

I have had an incident where my 2023 gmc 3500 hd was had left me stranded earler this week. i towed the new truck to a certified dealer and i haven't heard anything since then. they mentioned my transmission will need to be fully replaced because valve body issues of solenoid a,e,f, are stuck open and closed codes on the 10 speed transmission upon researching my trucks history it was manufactured in 2022 and pulled out for sale october 2022 and i have seen. 242454441 special recall the same issues i experienced shudder and engine power reduced and no parking gear or driving. i need help and didnt have any warning of anything about this till now since it was showing my vehicle only had a tailgate issue which gmc didnt help me out when i had to pay for my taillight after firewood flew out with the tailgate opening in jan 2023 they said it wasnt a known issue then fixed the tailgate but not the taillight so i need help proving my truck belongs with the 242454441 class of recalls because not only does the transmission the exact same as previous models obviously 1000s of others are getting this issue thank you

Filed Feb 24, 2026 · Transmission · TN

August of 2025 [XXX] purchased a certified GMC Sierra 3500. The truck had been traded in May and sat in their service department waiting on a valve body. At this point, we knew this. [XXX] had done research on it, and felt confident in being told the valve body was completely replaced and now working…. Worst mistake we’ve made in a long time. It was not replaced, that was only the beginning of the lies. [XXX] then drove the truck across the country for work, not knowing how much of a hazzard it was. Shortly after arriving there he quickly realized the truck was still having transmission problems. We brushed it off, these things happen. Fast forward when he came home in September/October he took the truck to the Rice Buick GMC service department. Where he was supposed to “wait” on his appointment. Only to call me hours later, they clearly weren’t going to be done that day. We left not knowing that it would be nearly a month until we could drive the truck again. In the midst of that they never offered any help, a rental or anything. When I asked, they offered a tiny small car next door at enterprise. I clearly did not agree, we just spent a lot of money on a heavy duty truck for a reason. It took multiple phone calls to multiple supervisors for them to agree to let him rent a truck. Because you know they might have to spend an extra penny or something (que the eye roll). In that month of having the truck the communication was little to non existent. They never answered the phone, called back, heck most of the time the text messages weren’t even replied to. It once again took me getting a little bit ridiculous for an answer - the truck was “fixed”. When I picked up the truck I spoke to the the service manager, and he of course tried to play me like I was some dumb women who had no idea what I was talking about. He dismissed all of my concerns, acted like having a truck for a month was normal. (More attached in photos) INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Jan 15, 2026 · Transmission · CO

I have a 2023 GMC Sierra HD3500 6.6 Duramax. February of 2025 the valve body failed after 23,000 miles. The failure happened when the transmission had an extremely hard shift at 55 mph and then went into 5 gear limp mode. Computer through code P0700 and P0747. The P0747 is the code that tells you the valve body failed. When I took the truck to the dealer, they would not let me take the truck home because of the high risk of the transmission locking up and causing bodily injury, aka crash. Since the valve body was back ordered, I was warmed that it may be a month to get a replacement and install it. I finally got the truck back after 33 days. To add to the frustration, GM would not give me a loaner truck. They would give me a loaner SUV but that did not have what I needed out of a vehicle.

Filed Aug 25, 2025 · Transmission · FL

My rear wheels randomly lock up and truck violently shakes. It does it randomly in very long trips so GM and every dealer I've brought it to just says that "they cant help me because they cant get it to replicate. Had the same issue with my 2020 and it has an open recall for the exact same thing. This is very dangerous and is going to get someone hurt one day if gm isn't help responsible and fixed their valve body failures for ALL of the 10L1000 L5Ps. Not just 2020-2022....it's ALL OF THEM. 2020-2025!!!

Filed Jun 1, 2025 · Transmission · WA

Formal Complaint Against General Motors and Dealership – Ongoing Warranty Issue and Vehicle Inoperability To Whom It May Concern, I am writing to formally escalate a serious and unresolved issue regarding my vehicle, and the lack of meaningful action taken by both General Motors (GM) and an authorized dealership. My case is not isolated, it mirrors the experience of thousands of other GM customers facing the same known mechanical defect, as widely documented in online forums and communities. On [XXX], I purchased a used 2023 GMC Sierra 3500 Denali with approximately 25,000 miles from a dealership. The vehicle included the original factory warranty, and I also purchased an extended warranty for additional coverage. On [XXX], at approximately 26,000 miles, the truck unexpectedly entered limp mode and the check engine light came on while I was driving with my children. Please note—this truck is equipped with the Allison Transmission, which is marketed as one of the most reliable transmissions available. I immediately took the vehicle to Blade Chevrolet in Mount Vernon WA, the nearest dealership, where it remained for nearly a week before a diagnostic was completed. I was informed by the lead mechanic, Jason Visten, that the issue was a failed valve body solenoid #1—a component he clearly identified as a known and widespread issue within GM’s system. Mr. Visten further stated that GM has not been responsive to the dealership's requests for this part, which is currently on national backorder with no estimated timeline for availability. I was even told this specific part is being built for new vehicle production and are being prioritized over parts needed for warranty repairs, leaving my truck unusable and indefinitely sidelined for up to a year per Blade Chevrolet. I contacted GM Customer Service directly and received the same generic response. Also worth mentioning I almost got rear ended cause of limp mode activation and transmission locked up. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA

Filed May 16, 2025 · Transmission · CO

Transmission issues 5/5/2025, bearly 15,000 miles on it, was excelerating from a stop heading down hill when rear tires locked up, engine downshifted, engine light and limp mode flashed across my screen. threw it into nutral and coasted to next signal and pulled into gas station back parking lot. No codes pulled. called dealer to share and they knew exactly what was wrong with transmition value body problem. but is my transmission ok? Towed to dealer, no fix in sight. 7th vehicle at dealer with same problem. Others been there for months waiting on same part. Thank God I wasn't towing anything, but now I have to pay for rental and they say they are waiting on parts??

Filed May 12, 2025 · Electrical, Transmission · OR

My truck has the shift to park issue and won’t allow me to shut the vehicle ignition off and I cannot shut the vehicle ignition off and it is unsafe and keeps me trapped in my vehicle. I have noticed that it is a common issue and recall on many gmc trucks and I took it to the dealership and they are not wanting to cover it with my two warranties I have on the truck and my vehicle is unsafe. I cannot park the vehicle and shut it off. When I go to put the truck in park on shift column lever, it says shift to park on dash and I turn it on and move shifter to drive and neutral and the vehicle still won’t allow me to shut it off and it shows the same issue.. the issue just began out of no where.

Filed Apr 25, 2025 · Transmission · 33,800 miles · FL

The contact owns a 2023 GMC Sierra 3500. The contact stated that while hauling a trailer and driving approximately 40 MPH, the contact attempted to merge into traffic and the message "Restricted Power Mode" was displayed. During the failure the transmission failed to properly shift into a higher gear, and the vehicle failed to exceed 67 MPH. The contact stated that later while driving at an undisclosed speed, the check engine warning light illuminated. The vehicle was towed 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 33,800.