2023 Chevrolet Silverado 1500: transmission slipping

Filed Jul 16, 2026 · Engine · KS

On Sunday, July 12, 2026, the 6.2L V8 (L87) engine in my 2023 Chevrolet Silverado 1500 ZR2 seized and locked up completely, resulting in total loss of propulsion. I was driving at 65 MPH when it felt like the transmission was slipping and I lost power and coasted the truck to the side of the road. COMPONENT: Engine (6.2L V8, RPO L87) — connecting rod/crankshaft failure consistent with Safety Recall N252494001 (the federal safety agency Recall 25V‑274). The vehicle is available for inspection. It is currently at Cable Dahmer Chevrolet, where it was towed on July 13, 2026, and remains inoperable. SAFETY RISK: The engine seized during operation, causing sudden and complete loss of propulsion in traffic. This is the exact failure mode identified in Recall 25V‑274 as increasing the risk of a crash. CRITICAL DETAIL: This vehicle previously underwent inspection under Safety Recall N252494001 and PASSED on Feb 3rd 2026 at VAN Chevrolet in Kansas City. GM deemed the engine non-defective and issued extended warranty coverage of 10 years/150,000 miles under the associated special coverage program. Despite passing GM's recall inspection, the engine suffered catastrophic failure. This appears directly relevant to the federal safety agency's open recall query regarding the effectiveness of GM's recall remedy. DEALER CONFIRMATION: A technician at Cable Dahmer Chevrolet has verbally confirmed the engine is locked up/seized. Formal diagnosis is pending master technician sign-off and submission to GM, expected the week of July 20, 2026. The manufacturer has not yet inspected the vehicle. WARNING SIGNS: No warning lamps, messages, or symptoms appeared prior to the failure. The engine failed without warning

Filed May 29, 2026 · Transmission · PA

Transmission went out while driving on highway, entering limp mode. Ended up needing a valve body replacement at only 20k miles which was covered, but now I am having more transmission issues still with delayed forward engagement and slipping gears and it is only at 65k miles. Seems to be a lot of customers having the same issue. Took months for the truck to be fixed as "many other trucks" were waiting on the same part according to dealership.

Filed Jul 7, 2025 · Transmission · AZ

The vehicle is now at the dealer for the second time regarding transmission shifting issues. First visit I was told they can find nothing wrong despite my experiencing transmission slipping, loud clanking on shifting, and severe jolting when shifting. While having a travel trailer hitched to the truck after the first visit, I experienced all the same issues with the addition of transmission overheating warnings on the dashboard and near complete stoppage of the vehicle at highway speed. The same dealer now says the transmission "valve body" is defective and is being ordered. Due to Towing a trailer with this truck (much lighter than rated capacity) I have the transmission fluid changed on nearly every oil change. The Transmission filter has been changed on the recommendation of my mechanic, strictly due to quantity of fluid changes.

Filed Jan 24, 2025 · NH

Moter blew with 19,000 miles on a leased vehicle. Blew a rod out of the block and there was no warning light or notice at all. Almost got rear-ended. Took 3 months to replace moter. New motor knocks and ticks...... I also told them the 10 speed transmission slips between seventh and eighth gear they said there's nothing wrong truck still slips between seventh and eighth gear to this day.

Filed Oct 26, 2023 · Engine, Transmission · UT

2023 Silverado 1500 3.0 Duramax. Transmission failure and engine overheating at 5k miles. I was towing a trailer when the 1st transmission failure occurred. The engine shut off, and said shift to N to start while coasting with loss of power braking. I was able to get started but transmission would slip when shifting above 1st gear. I had to tow to the nearest level point to safely park the vehicle, for fear of rolling backwards down 8% grade. At that point the computer was showing engine overheat loss of power warnings. GM roadside assistance towed to nearest dealer, refilled transmission with fluid, and put me back on the road for it to fail again in traffic (loss of power / unable to move). I have now been without vehicle going on 30 days and worry there is more wrong with the vehicle than just a blown transmission (latest GM diagnosis with no repair eta). For a few hours prior to failure I noticed what seemed like the transmission hunting for gears at lower speeds (0-25) with hesitation. Could have been slipping. And also noticed strange / louder than usual turbo noises. I worry the system is generating too much pressure or has mixed oil with coolant somewhere, based on finding atf, coolant, and engine oil near the overflow and all over the bottom of the vehicle. GM support has been atrocious and someone should step in.