Chevrolet Silverado 3500 loss of power problems

Filed Jul 19, 2026 · Fuel system · OR

I own a 2015 Chevrolet Silverado 3500HD Duramax diesel. At approximately 130,000 miles, the high-pressure CP4 fuel pump failed internally, sending metal shavings throughout the fuel system and contaminating major components. The truck suddenly lost power on the freeway and became inoperable without warning. I was barely able to get out of traffic before it had to be towed to a Chevrolet dealership. This created a serious safety hazard, especially considering the risk if it had happened while towing my fifth wheel with my family. A failure like this should not happen at this mileage on a heavy-duty diesel truck. I also cannot afford the extremely high cost of repairing the entire fuel system. From my research, many other owners have experienced the same CP4 fuel pump failure, which often destroys the entire fuel system and leads to very expensive repairs. I believe this is a widespread defect, not normal wear and tear. I ask the federal safety agency to review these failures and take action to protect vehicle owners from similar dangerous and costly failures. This truck currently sits at the dealership as I cannot afford the repairs and GM will not fix what they know is faulty parts.

Filed Jun 15, 2026 · Electrical · FL · 1 injury

I was driving down the XXX Expressway Sunday, XXX, with my children in my vehicle. This is a very heavily traveled highway in [XXX] with heavy traffic. My 2024 Chevy Silverado 3500 Diesel HD Truck with 25,500 miles suddenly started throwing multiple codes, lost power, and steering. Fortunately I was able to "roll into" the emergency lane while muscling the steering in that direction and engaged the emergency brake. My other son was following shortly behind me in his vehicle and pulled over to assist us about 30 mins after my truck was sitting stalled in the HWY. He parked his truck behind mine, put on his hazards, and we were transferring gear from my truck to his truck. At this point my 2024 Chevy HD Silverado Diesel started rolling back on it's own and nearly crushed my son's friend. The parking break was on and it suddenly released on it's own. It took 3 grown men to stop it from crushing my son's friend. The force was so strong that when he lifted his hand to try to stop the truck from rolling, it broke the right rear tail light. He could have been crushed between our two trucks from this situation. I have never been notified by GM of any recalls, however, the truck had to be towed to Ferman Cheverlotte service on Adamo Dr, Tampa Fl and is currently sitting on their lot. I was told by the service tech Michael Stevens that the vehicle had several open recalls that they would address but did not offer any information about what could be wrong. After searching online, I found that GM IS aware of this issue and sent several service bulletins about this exact problem. I had contacted the Ferman service center the week before to bring the truck in because the AC was out and made an appointment for service on Tuesday. The day after I made the appointment my batteries died and had to be replaced by AAA.It is disturbing to know GM and FERMAN Service centers are aware of this safety issue on these HD trucks and never informed me, the consumer. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U

Filed Feb 20, 2026 · Fuel system · NY

Service engine light kept coming on the dash, and the code came back to a faulty DEF heater. My truck had a reduced power countdown on the dash indicating the truck was going go to into limp mode after x amount of miles. On warmer days the code would go away and there would be no reduced power. The vehicle was diagnosed at a GM dealership and confirmed the DEF heater was bad, but was notified that there is a bulletin with GM for this issue occurring in many other diesel trucks. My safety was put at risk due to the rapidly changing reduced speed milage, at any point it could drop from 100miles, to 10 miles until reduced speed. This could cause an instant car accident while driving if the truck were to randomly slow down to a speed much slower than the speed limit. IE- driving on the north way (65 speed limit) and having the speed drop to 5mph unexpectedly when you just had over 100 miles to reduced speed.

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 Jun 17, 2025 · Transmission · ID

Reduced power transmission module defective.

Filed Dec 26, 2024 · Fuel system · OH

Injector #4 connector harness issue- Known issue on the 6.6L duramax. Driving with my children for Christmas pickup and power reduction occurred while passing another car on the road. Causing us to hit the breaks as the truck wouldn’t allow us to pass timely. Known harness issue by GM and instead of covering I had to pay to have a new connector spliced in. Multiple warning lights. Check engine, Emissions warning, Reduced power, Traction control, parking brake

Filed Nov 14, 2024 · Transmission · NJ

My 2022 Chevy Silverado has been to 4 different GMC/Chevrolet Dealerships since August 2024 and is currently broken down in Indiana at Sauers Buick GMC Although, it has been to 4 different dealerships to confirm there is a Faulty Part of the Transmission, Part # 24048701 A Body Control Valve, i have been on the waiting List since August 2024 for this part at 4 different dealers ships Some days it drives fine, and others it will flash a message that it is in Reduced Power Mode and it will not shift properly at this point There is no parts available, so i have continued to drive my truck since i am making payments on it. It Broke down and would not shift into Gear on October 31, 2024 in Indiana. At that point It flashed an error message that the Transmission was Hot. I called for a tow truck and had AAA tow it to the closes GMC Dealer Today is November 14, 2024, it has been at the same Dealership for 2 weeks with No Eta from the dealership or GMC corporate as to when it will be fixed. Since it has been undriveable for 2 weeks, what is my course of action? Since the Body Control Valve Part # 24048701, is not available, i am seeking a full transmission replacement which I am also waiting for an answer on

Filed May 24, 2024 · Fuel system · ID

Bosch CP4 fuel pump failed 400 miles from home leaving us stranded. We were towed in and spent thousands of dollars and 5 weeks to have the truck repaired. Only warning was that the truck was losing power and barely got off the road.

Filed Feb 27, 2024 · Brakes, Electrical · UT

Message will appear that states : trailer brake system needs serviced “ When that appears and I am currently towing a trailer I lose all power to trailer including the brakes. I can’t signal I can’t use the trailer brakes. I’m towing 14,000 lbs and when I’m going down a 6% grade this is very dangerous. I have had vehicle in twice for this issue , first time I was told they replaced a controller, 2nd time they said no problems detected. For me to lose all power to tow vehicle is unacceptable and extremely dangerous

Filed May 15, 2023 · Electrical · MI

The electrical connector vibrated loose at the injector. The mechanic said he has seen this happen before and GM said its because those motors vibrate excessively. It caused my vehicle to run in reduced power mode. In that mode it was lurching forward uncontrollably and it felt like the transmission was banging. What damage will that alone cause in the future? Also, if GM knows there is an issue, why isn't it fixed? Why is the consumer responsible for poor engineering or design flaws? It isn't normal wear and tear or neglect on my part. The repairs including the part and the rental car cost me $640.45! Oddly enough it wasn't covered under any extended warranty or recall so I had to pay out of pocket. Very dangerous and expensive!