GMC Sierra 1500 sudden acceleration problems

Filed Oct 6, 2026 · Brakes · OR

At 20 mph, the truck experienced unintended acceleration during normal braking. Light braking did not trigger the safety brake-override system, and the engine continued to pull forward until I was forced to mash the brake pedal completely down to overpower the engine.

Filed Oct 2, 2026 · Engine, Transmission · TX

The powertrain/transmission is malfunctioning. The vehicle shutters, vibrates, and surges forward when coming to a stop, as if it wants to take off on its own. These symptoms began within the first couple of days after purchasing the vehicle on XXX. The valve body was replaced, but the issue continues. The vehicle is available for inspection. GM Case Number: XXX Dealership TAC Case: XXX This creates a serious safety risk. When stopping, the truck shutters and unexpectedly tries to lunge forward, which could cause a collision with another vehicle or pedestrian. The unpredictable movement makes it dangerous at intersections, stop signs, and in traffic. The dealership has reproduced the issue multiple times and performed diagnostics, but the shuttering and surging continue. The vehicle was last inspected around XXX. On XXX, I called GM to speak with [XXX] for an update on when a GM representative/technician would inspect the truck. I was told the case had been closed even though no resolution or inspection occurred, and [XXX] never called me back. No other agencies have inspected it. There were no warning lamps. Symptoms began within days of purchase and include shuttering, vibration, surging forward when stopping, and inconsistent acceleration. These symptoms occur daily and have worsened over time. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Apr 16, 2026 · Driver assistance · MI

I am reporting a serious safety issue involving unintended acceleration in my vehicle. The vehicle accelerates unexpectedly without driver input (specifically without pressing the “resume” function), requiring immediate braking to regain control. This issue has occurred numerous times over the past 4–5 months. Incidents have primarily happened at low speeds (approximately 20–25 mph or less), including while making turns, exiting parking lots, and once in our yard, where the vehicle nearly struck our home. The problem has occurred both when adaptive cruise control was active and when it was turned off. In the most recent incident, adaptive cruise control was off, and the vehicle suddenly accelerated while traveling in about 20–25 mph on the main street. The driver had to apply the brakes forcefully to avoid a collision with the vehicle in front. There have been no warning lights, alerts, or messages prior to these events. During at least one incident, a “braking required” message appeared only after the unintended acceleration had already begun. The vehicle has been taken to a GMC dealership multiple times, but the issue has not been duplicated by them. The dealer suggested the possibility of accidental activation of the “resume” button; however, this did not occur. The vehicle is currently at the dealership (since April 6) and is available for inspection. This defect presents a significant safety hazard to the occupants of the vehicle and to others on the road.

Filed Mar 4, 2026 · Transmission · OH

With the cruise set at 55-60 mph the Rpms will jump, along with a slight shudder feeling. Cruise control has turned off a few times due to this. Cruise set at 25mph and would shudder/lunge forward. Torque converter is showing it’s slipping and will need replaced. No check engine lights.

Filed Feb 20, 2026 · Transmission · 97,000 miles · TX

The contact owns a 2020 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the vehicle unexpectedly sputtered. There was no warning light illuminated. The vehicle was taken to the dealer, where it was diagnosed with torque converter failure. The dealer determined that the torque converter needed to be replaced. The vehicle was repaired. The contact later stated that while driving at an undisclosed speed, the vehicle unexpectedly went into LIMP Mode. There was no warning light illuminated. On several occasions, the vehicle unexpectedly downshifted and lunged forward while stopped at a traffic light. There was no warning light illuminated during the failure. The dealer was contacted. The vehicle was not diagnosed or repaired. The manufacturer was made aware of the failure and referred the contact to the federal safety agency Hotline for assistance. The failure mileage was approximately 97,000.

Filed Feb 4, 2026 · OH

While sitting at a stop sign heard a loud bang and truck lunged forward as if we were rear ended . Actually thought we were . Drove about 20 miles and transmission went out . Even though i had foot on brake truck still went forward . Had to have transmission replaced at $6421.58 in Florida while on vacation . Have researched on internet and found several cases exact same thing . Even shop that did work said GM had a problem but was doing nothing as of yet .

Filed Dec 22, 2025 · Engine · 25,000 miles · NC

The contact owns a 2022 GMC Sierra 1500. The contact stated that while driving approximately 65 MPH, the check engine and several other warning lights were illuminated. The contact stated that the vehicle almost stalled and then lunged forward. The vehicle was driven back to the residence, and a local dealer was contacted. The contact had taken the vehicle to a local dealer, where it was not yet diagnosed or repaired. The contact stated that the vehicle was repaired under the federal safety agency Campaign Number: 25V274000 (Engine and Engine Cooling) by the same dealer. The contact stated that the dealer had tested the engine and added thicker viscosity oil. The contact related the failure to the recall work. The manufacturer was not informed of the failure. The failure mileage was approximately 25,000.

Filed Oct 30, 2025 · Acceleration · 7,800 miles · AZ

The contact owns a 2025 GMC Sierra 1500. The contact stated that while tapping the accelerator pedal, the vehicle suddenly accelerated. The contact stated that the tires were squealing. The contact drove over a cement barrier after depressing the accelerator pedal. There were no warning lights illuminated. The local dealer was contacted. The vehicle was not diagnosed or repaired. The manufacturer was contacted but no assistance was provided. The failure mileage was approximately 7,800.

Filed Sep 23, 2025 · Acceleration · 3,000 miles · MI

The contact owns a 2024 GMC Sierra 1500. The contact stated that while coasting at speeds of approximately 1- 3 MPH, and gently pressing the accelerator, the vehicle suddenly surged forward and accelerated quickly. The accelerator pedal was released, and the brake pedal was depressed, allowing the vehicle to come to a stop. The failure had occurred approximately 5 times within a year and a half. The vehicle was not taken to the dealer to be diagnosed or repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 3,000.

Filed Sep 18, 2025 · Transmission · TX

Torque Converter failure confirmed by dealer: was driving at high way speeds when I noticed a slipping sensation from the transmission upon any sort of acceleration. No warning lights were illuminated or any symptoms leading up to the failure. This could have potentially caused me to lose any form of acceleration that would enable me to get off of the highway or away from a situation requiring sudden acceleration.