2023 Chevrolet Tahoe Power Train

Vehicle down shifted hard and dash board lit up. Wouldn’t shift any higher than 4th or 5th gear. Fortunately we were only going about 35mph. If we would have been on the interstate as we had been the 2 previous days on our trip to Florida it could have been deadly. Brought the Tahoe to Ron Anderson GMC Chevrolet in Yulee, Florida on 3/18/25. The transmission valve body is the problem. As of today 4/11/25 we haven’t heard another word and returned home to Michigan 3 weeks ago.

I was driving on an interstate when the vehicle check engine light came on and it went into limp mode causing the vehicle to go into low speed in the middle of traffic. Check engine light code P0747

Engine light came on. Flagged for a bad transmission valve body. Informed by dealership that the piece is on backorder and has been on back order for months.

While traveling on [XXX] approximately 20 miles west of Rawlins WY the vehicle entered “limp mode” causing us to drive at an unsafe slow speed. The transmission caused a check engine light to activate which was confirmed by a service technician in Rawlins with a PO747 code show on his OBD2 scanner. The problem was confirmed by the servicing dealer in Lincoln NE. The transmission was inspected by the servicing dealer. They replaced the valve body and fasteners approximately 1 1/2 months later. The problem first occurred at the time of the incident and I had no prior warning. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Torque converter needed to be replaced, and then a week later still had the same shuttering and loss of power and the valve body needed to be replaced. Got it back and it still is shuddering and hard shifting.

Our 2023 3L diesel Tahoe had 63,000 miles on it and went into limp mode (CEL on) in late April 2025. We took it to the dealership and they diagnosed the valve body as the problem. We continued to drive it (as they mentioned it would be months before a replacement part would be in) while I did some research and discovered the magnitude of the problem. Just google it! Meanwhile, the rear wheels locked up on me after I had picked up our two children from daycare. It felt like we had a log chain hooked to our hitch that snapped us back - really hard! Felt like we had been rear-ended. This could have easily caused us to get in an accident, or worse, but thankfully we were not in heavy traffic. Our dealership was able to provide us a loaner truck. Approx. 50 days later, we were informed that we were approved for a new transmission - which was also on backorder! Almost 80 days later, our new transmission has arrived and been installed. We are very disappointed with how GM has handled the issue. We were lucky our dealer provided a loaner, as many have not. There are after-market providers who clearly state the upgrades they've made to the valves bodies, and while GM says they've upgraded the ones they make now, they won't share any details. I'm aware of this same limp mode/rear wheel lock up happening multiple times (on the same vehicle) to people in very low-mileage vehicles (less than 1000 miles). This isn't a small problem, and GM knows it. We will see how far we get with this "new" transmission, but as you could guess, I don't have high hopes! I just pray that no one gets killed.

I noticed the gears of my Tahoe grinding when I would let off of the gas pedal. Eventually my check engine line came on. I brought it to my Chevy dealership. Upon inspection, I was told that my transmission valve body was bad and that I needed a new one. I was then told that my truck was ok to drive. I drove it for roughly another month until the check engine light came on again, and I heard the same sounds (I was able to catch it on video). This time, my truck would not want to accelerate past about 1.5 RPMs. I brought it back to the Chevy dealership which is where my truck is today. In hindsight, I believe I should not have been allowed to continue to drive my truck with a bad transmission part.

The contact owns a 2023 Chevrolet Tahoe. The contact stated that while driving 15 MPH up an incline, there was an abnormal bumping sound coming from underneath the vehicle. The contact stated that the vehicle hesitated, and the transmission was slipping. There was no warning light illuminated. The vehicle was not taken to the dealer or an independent mechanic to be diagnosed or repaired. The manufacturer was not notified of the failure. The failure mileage was 17,000.

My 2023 Tahoe with 76,000 miles went into limp mode and activated an engine light. The vehicle was taken to the dealership and had the code P0747 which is pressure control solenoid A is stuck on. The dealership technician is recommending a valve body replacement to repair this problem. This is a known problem by General Motors and has extended it to the 2022 models only. This is a safety concern that is causing rough irregular shifting, and a engine light to occur.

The vehicle’s transmission began slipping at low speeds with less than 40000 miles. I took it to the dealership for diagnostic testing and the requested that I do “maintenance transmission fluid replacement” as well as some additional reprogramming which the dealer also deemed as maintenance. However, the required transmission fluid replacement was not required until 45000 miles and the reprogramming is not listed anywhere in the maintenance plan.

While driving and accelerating the transmission malfunctions and wont shift so as I try to accelerate the car stops accelerating and just goes very slow. This put us at risk as cars were coming fast behind us. The problem happened 3 times before taking it to the dealership where they knew exactly what the problem was because it has happened to so many others. The warning light that came on was the engine light and a message that read "Reduced Acceleration Drive with Care"

The contact owns a 2023 Chevrolet Tahoe. The contact stated while driving approximately 60 MPH, the vehicle suddenly decelerated to 5 MPH. The message "Deceleration - Warning" was displayed. The contact was able to pull over to the side of the road. The contact turned off and restarted the vehicle. The vehicle was taken to the dealer, where it was diagnosed that the transmission valve had failed and needed to be replaced; however, the part was not available to repair the vehicle. The dealer advised the contact that the vehicle was unsafe to drive. The vehicle was not repaired and remained at the dealer for more than two months. The manufacturer was notified of the failure and confirmed that the part was not available. The failure mileage was approximately 35,000.

Driving on hwy at 75 mph and needed to brake. While decelerating and still moving, engine shut off, dashboard dinged and message said to press start. Vehicle put itself into neutral. Happened twice while driving on highway. Car currently in shop. GM stating transmission valve body needs to be replaced. Tahoe only has 28K miles. Part is on back order

Transmission issue. Vehicle has the Duramax Diesel with 10-speed transmission. I am aware of issues with earlier year/s transmissions. I have experienced shuddering, jerking, a SINGLE momentary rear axle lockup. Jerky engagement from drive to reverse and or back. Reduced Acceleration warning on display. Check engine light comes and goes. Waiting for dealer to further inspect, drain fluid, etc. It appears from the VIN check that this vehicle had some metal work/paint prior to delivery to selling dealer, paint does not match. The transmission issue at 15,000 miles is just plain scary and not what one expects. That this vehicle sold as a 2023 has same issues as earlier model years makes me wonder if this is in fact a late 2022 model with the known defective transmission valve body? Any help appreciated.

To whom it may concern, I had purchased Tahoe 2023 few months back . It’s my first suv through carvana, I’m very disappointed since I had the suv. From first day it start giving me issue I even got few things fixed under warranty. But as soon the warranty expired the suv had transmession issue . Looks like who ever carvana got this suv from has issue with it . I believe carvana has not throughly checked the suv . it’s really disappointing. Now my suv is at dealer and already need to replace some part in transmission. And the worse part is they don’t even have parts available from GMC . Now I’m stuck with repair cost and have no car to drive because they can’t give me eta on parts . I need someone to contact me and please try to help me out with this matter . I’m gone attach repair invoice . As well Either maybe I can give suv back and get another one or help me out with the issue . Thanks Please contact me 2023 Tahoe premium GM don’t have part available looks like it’s going on issue Email form Gm We are following up in regards to your 2023 Chevrolet Tahoe, case number [XXX] Ciocca Chevrolet Of Princeton ordered a valve body for your vehicle. As of right now we do not have an ETA on when the part will be shipped to your dealership. Should you have additional questions or concerns, you may respond directly to this email for the fastest response. We can also be reached through social media channels such as Facebook and Twitter. Otherwise, please wait for us to contact you via phone or email about your Service Request. Again, we appreciate and thank you for your continued patience and understanding. Thank You, Natasha on behalf of Sarah Chevrolet Customer Assistance Phone Number: 1-866-790-5600 [email protected] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

vehicle shutters when downshifting/slowing. Most commonly at cruising speeds between 40 and 50 mph, but does occur at lower speeds as well. Vehicle can be felt vibrating/shaking consistently every time it is driven. Was taken into a dealership, was not adequately diagnosed as it was only test driven 1 mile per the paperwork and they could not duplicate the issue and was told they were "in the business of making money to repair vehicles" and this was a warranty repair. While leaving a gentleman was walking in and happened to have the same type of vehicle and asked my husband what we were there for, turns out he was having the same issues. The vehicle shuttered the entire drive home after leaving the dealership and has continued since.

At 5000 miles after the last oil change, my low oil light came on, took it to my local mechanic and he said it was 3 quarts low. took it to the dealership and they say this is normal but have me to a check every time i put gas up to 2000 miles. bring it back and they say its one quart low and this is normal. The attendant at the dealership says he sees this often and knows its frustrating but thats GM policy and there is nothing he can do. I do not think this is normal and have searched on the internet and find that many people have this problem. I do hope this is looked into because i feel like this is an issue and GM doesnt want to have to fix it because of cost

We have a chevy with the 6.2 V8 engine. First we were at a stop light on the highway and the car shifted into Neutral and would not come out for two light cycles. My wife and children were stuck at the light with car's swerving around them at 65+. Finally it shifted into Drive. We called the Chevy dealership and they said it would be a month before they could look at the car and there were no check engine warnings. Two days later my wife and family were driving down the highway and suddenly it started making a flapping sound from the engine bay and was losing power. She pulled over and turned off the vehicle to see if that changed anything. The car would not restart and the check engine light was on (solid not flashing) it would just try to turn over with no success. We had it flat bed towed to the chevy dealership where they told us the engine was blown and that it had thrown a rod. We have 3900 miles on the vehicle and I would say this is a significant safety issue given that it can disable the vehicle on a busy highway.