2024 Chevrolet Silverado 3500 transmission problems

Filed Sep 8, 2026 · Engine, Fuel system · FL

The Engine Cooler has a know defect that GM has put out service bulletins for. The engine cooler is cracking, mixing oil and antifreeze that is creating a sludge that runs thru the entire system. GM wants techs to attempt to clean/flush the engine before they approve a new engine to be ordered under warranty. GM is aware of the problem and there should be a recall out on the problem according to the service manager I spoke with at the dealership my truck is at currently. I was told the expected time frame is up to 3 months for the work to be completed, with no loaner available that is equivalent to the vehicle that went to the shop. The recall is necessary because if the engine has a major failure while driving it could cause an accident, if the vehicle is hauling a heavy trailer that could be detrimental because the truck can haul up to 40,000 GCWR.

Filed Jul 7, 2026 · Transmission · WI · crash

moved the truck on to the lawn and put it in park turned truck off. got out of the truck and went into the garage and 5 min later came out and saw the truck started to roll and went 50 ft and hit a tree.

Filed Jul 2, 2026 · Transmission · MI

Transmission has shifting issues (hard shifts) . Vehicle is available for inspection upon request. Safety could be an issue if the transmission fails while driving that could cause harm to the vehicle driver and put others at risk. Vehicle is scheduled for inspection however the dealer is very backlogged.

Filed Mar 30, 2026 · Transmission · MN

REAR WHEEL LOCKUP: While driving down the highway pulling a loaded trailer the rear wheels locked up, GM has an open recall on 2020-2022 models but denies its an issue with the 2024 model, my dealership pushed a “software update” but that does not fix the faulty transmission valve body issue, it just overrides the safety features that were designed to protect the transmission. I have a video of it occurring while slowing down for a stop sign when it did it the second time to me.

Filed Mar 6, 2026 · Engine, Transmission · PA

The engine oil cooler failed causing engine oil to leak into the coolant system on my 2024 Chevy Silverado 3500HD. This requires a full replacement of the coolant system. In addition, excessive sludge buildup inside the motor is caused. This is a known issue with GM for 2024 Diesel vehicles. GM has released a service bulletin but is fighting my local dealership on the required repairs.

Filed Feb 11, 2026 · Transmission · IL

Vehicle was making a very loud humming noise at 73 mph. After returning to the dealership they found that the bearings in the rear end house had destroyed themselves causing internal damage to the housing and the entire rear end now needs to be replaced.

Filed Jan 28, 2026 · Transmission · OK

the federal safety agency Vehicle Safety Complaint I am reporting a serious transmission defect in my 2024 Chevrolet Silverado 3500HD LT that creates a high risk of sudden power loss, erratic shifting, or loss of control while driving. Vehicle Details: - Make/Model/Year: Chevrolet Silverado 3500HD LT, 2024 - VIN: 2GC4YTEYXR1263768 - Engine: 6.6L Duramax diesel - Transmission: 10-speed Allison (10L1000) - Mileage at diagnosis: ~46,000 miles - Title: Rebuilt (warranty denied due to branding) Defect Description: The transmission shifts normally when cold (fluid below ~138°F). Once warm (during normal driving), it fails to upshift properly in gears 5-8: holds lower gears, causes high RPMs (3,000+), delays shifts excessively, or refuses to shift. When shifts occur, they are hard and jerky. Automatic (Drive) mode is affected; manual/L mode works normally as a workaround. No warning lights appeared initially, but the issue has worsened and is now frequent at operating temperature. Diagnosis: On January 28, 2026, Seminole GM (1405 N Milt Phillips, Seminole, OK 74868; 405‑382‑6130) diagnosed a defective valve body requiring replacement. Quote: - Valve Body Control Module (Part #24065357): $687.48 - Transmission Fluid (12 qt @ $10.92): $131.04 - Labor (diagnosis + pan/filter/relearn): $805.50 - Supplies/taxes: ~$140 - Total: $1,763.94 Dealer confirmed this is a common issue; photos of quote available for upload. Safety Risks: At highway speeds, delayed/no upshifts can cause: - Sudden inability to accelerate (merging, passing, hills) - Harsh engagement leading to wheel slip or loss of control - Potential limp mode entry, stranding in low gears This intermittent warm-only failure is unpredictable and dangerous. Context: This matches widespread complaints on 2023-2025 GM HD trucks with the 10L1000 (forums: DuramaxForum, Reddit r/Duramax/r/Silverado, GM-Trucks.com), involving valve body wear/pressure loss. Earlier years had related recalls (e.g., the federal safety agency 24V‑797 for valve issues),

Filed Jan 28, 2026 · Transmission · IL

This vehicle was purchased with 10,000 miles from a Chevrolet dealer. At 13,000 miles the transmission started making an awful noise. Up a service check it was found that the transmission pump was failing.

Filed Oct 27, 2025 · Engine, Transmission · CA

At approximately 35,126 miles the oil cooler cracked and flooded my engine cooling system with over 2.5 gallons of oil causing catastrophic engine failure.

Filed Oct 1, 2025 · Transmission · CO

I was driving on the interstate at around 65mph. Towing my fifth wheel. Transmission started shifting hard with a loud bang that sounded like we hit a huge pothole. A message popped up in the screen indicating “Reduced acceleration, drive with caution”. The transmission seems to be stuck in gear as we exited the highway. Check engine light was on. Came to a stop at a stop sign and barely had enough power to pull into a parking lot. We had the truck towed to a nearby dealership. Fault codes P0700 and P0747 were present. Service advisor said valve body would have to be rebuilt. It’s been 2 weeks and the valve body cover plate is still “backordered” with no estimated in stock date.