GMC Sierra 1500 stalling problems

Filed Nov 3, 2026 · Engine · FL

My vehicle has now been at the dealer two times for issues with the engine. The first time they said my lifters needed to be replaced. They rebuilt the engine to replace the lifters and other engine parts. I picked the truck up and two days later I was driving home and the engine quit on me and I had to pull to the side of the road. I tried to restart the vehicle several times and then it started up, but only for one more mile and it completely went out again and would not restart. It had to be towed to Shumacher GM dealer in West Palm Beach. This definitely put my safety at risk since the truck shut down while driving. It seems that GM is having major issues with their engines. It is presently being inspected by the dealer and GM. I have not heard back of what the issue is, but I believe the engine will need to be replaced. I did not receive any warning messages or had no clue that the engine was going to shut down.

Filed Oct 29, 2026 · Fuel system · WA

On [XXX], at around [XXX] my 2023 GMC Sierra 1500 Elevation suddenly lost power while I was driving eastbound on [XXX]. The battery was still running, but the engine lost power and the accelerator did not respond and the truck would not move. I was stranded in the roadway. OnStar emailed me about a critical vehicle issue and reported DTC P129F. Because the truck was stopped in a live lane of traffic, I called 911. Responders blocked part of the road to protect me and to give the tow truck room to recover the vehicle. No one was injured, but this could easily have caused a serious collision. A few days later, I had the truck towed to Seaview GMC in Lynnwood, WA. The dealer diagnosed an internal failure of the fuel pump power control module, the K111 Fuel Pump Driver Control Module mentioned in the GM Bulletin earlier this year. This matches a known issue described in GM Service Bulletin 24-NA-139, which covers DTCs P129F and P023F and lists 2023 Sierra 1500 models. The bulletin describes symptoms including no-start and stalling. The dealership has attempted to charge me $200 for diagnosis and $261 for the fuel pump module. I had asked them if this was covered under warranty, they responded that they would check with their warranty specialist. This conversation happened at the Seaview GMC Dealer approximately 5pm on [XXX]. The informed me they would call the next day to confirm if this is covered or not covered by warranty. I am reporting this because a sudden loss of power while driving on a highway is a serious safety risk. I am concerned that other owners may experience the same failure at highway speed, and I would like the federal safety agency to review this issue. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Oct 25, 2026 · Engine · CO

My vehicle has the loss of propulsion recall 25V‑274. It was in for service on 5-12-2025 with NO REMEDY YET on my paperwork. 8-6-2025 the truck was in for service and passed the test that would have required immediate engine replacement. As per the recall, I was given different oil as a remedy for a faulty engine. Despite passing the test, I still lost propulsion on 6-11-2026. I was traveling on the highway at night, crested a hill and noticed while coasting that the engine was not running and the dash said "hit the start button again." When I did this everything turned off including the lights. I was still traveling at 65 MPH without lights. Luckily I didn't panic and the lights came back on when I hit the start button again. Once the vehicle coasted to a stop; and I put it in park the motor restarted. This incident was reported on 6-14-2026, complaint number 1174-4867. When I submitted this complaint, I started that GM needs to make a change so hitting the start button when the engine has stalled doesn't turn the lights off. The vehicle was towed to the dealership, they had it for two months, put around 1000 miles on it and returned it to me with no repairs made because they couldn't reproduce the problem. They returned it to me on 7-29-2026. They did not to the engine. I radio repair was unsuccessful so it went back to the dealer that same day. 8-10-2026 Vehicle return without repairs to the radio or engine. 10-10-2026 On my second drive on the highway since having the vehicle returned to me, the engine shut off again on the highway at 65 MPH. After coasting to a stop, the engine would not restart and it was towed to the dealership. They have the vehicle and are repairing the engine. My concern is that this vehicle passed a loss of propulsion recall, still had loss of propulsion twice. I have concerns for my safety in this vehicle. I do not have confidence the current repairs will not result in another loss of propulsion.

Filed Oct 21, 2026 · Electrical, Engine · TN

The engine locked up and stalled out while driving. GM replaced engine but still experiencing issues. Dealer has admitted that they will likely recall my model year since it is an ongoing and same issues as recalled trucks. I have a vehicle I am not confident in nor safe it since it stalled while driving.

Filed Oct 18, 2026 · Brakes, Engine · LA

Service light came on because the brake petal would push back when I tried to start it. At times, I had to push down all the way almost to the floor and then it would start. If I eased up slightly or did not push all the way, the truck would hesitate to start. I brought it in to Courtesy GMC of [XXX]. They found metal debris in oil. The car warranty did not want to replace the entire engine as General Motors' bulletin had stated as a corrective solution. They only wanted to replace the camshaft and rocker arms because [XXX] did not tear down the engine to the point of failure. [XXX] stated that they did. After going back and forth with EasyCare (myself and [XXX]) I authorized the repairs EasyCare suggested. XXX, a Service Brake Assist message came on. I brought it to [XXX]. They rectified the issue. XXX,Truck stalled getting off XXX at light. Truck kept turning on and off. I put it in park and was able to turn in on. As I was driving the truck was rocking back and forth as I pressed the gas pedal. I was able to pull into the Super1 Foods parking lot. Trucked stalled halfway into parking lot. After two attempts to turn off and start truck I was able to pull it up all the way to ensure safety. Texted [XXX] at Courtesy. I called the number he sent and a tow truck from Cliff’s Towing and Recovery, LLC retrieved my truck and brought it to Courtesy GMC in [XXX] where it is currently residing. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Oct 18, 2026 · Fuel system · FL

The vehicle failed to start. It started after 30 minutes and I was able to drive it home. Then it starts and stalls after multiple attempts. Receiving codes P1177 and UI8A2. Was told that a bulletin exists for this issue on GM vehicles, GM Bulletin 24-NA-139, but I found out that it don't cover my VIN number. This can cause the vehicle to stall or shut off while driving. GM should make this bulletin for all vehicles of certain years who carry this modules.

Filed Oct 13, 2026 · Engine · 70,172 miles · WI

The contact owns a 2024 GMC Sierra 1500. The contact stated that while driving at 70 MPH, the vehicle unexpectedly started shaking and losing power until it completely stalled. The check engine warning light started flashing, and the warning messages "Service ESC" and "Service Traction Control" were displayed. The vehicle was towed to the dealer. The contact discovered that the engine had previously been replaced by the dealer at 46,370 miles under the federal safety agency Campaign Number: 25V274000 (Engine and Engine Cooling) under the prior owner; however, the failure recurred. The contact associated the failure with the safety recall. The dealer was contacted regarding the issue. The failure mileage was approximately 70,172.

Filed Oct 6, 2026 · Engine, Fuel system · LA

While driving on a public road, the 6.2L L87 V8 stalled without warning. There was heavy smoke and an oil trail of about 300 yards behind the truck. The engine would not restart, and the transmission would not shift into neutral. The truck was moved a short distance off the road and towed the next day to the selling GMC dealer. Odometer was 4,663 miles. Oil life remaining was 38 percent. The truck was stock, with no modifications, and was operated on premium fuel. No warning lamp was noticed before the stall. The failed engine is at the dealer and currently under inspection. The dealer inspection is not finished, and no written cause has been provided. This is a sudden loss of propulsion. Please associate this report with Engineering Analysis EA26005 concerning connecting-rod and crankshaft failures in the GM 6.2L L87 engine.

Filed Oct 1, 2026 · Engine, Fuel system · CA

1. I am being told that the high-pressure fuel pump (HPFP) catastrophically seized and locked up internally while driving. Because the HPFP on the 3.0L Duramax (LM2) engine is directly driven by the engine's timing system, this sudden mechanical seizure instantly destroyed the engine timing gears and snapped/skipped the timing chain. The failed components are currently intact inside the vehicle and are fully available for inspection upon request at Ron's Smith GMC in Merced, CA. 2. The failure occurred on busy Labor Day (XXX) while our family of [XXX] was traveling back home at 70 mph on a major highway. The truck violently shook, instantly lost all engine power, and forced the vehicle into a dangerous limp-mode state before completely stalling in live highway traffic at night around 10:45 pm. This sudden loss of propulsion at high speed severely compromised our ability to safely navigate out of the way of fast-moving highway traffic, creating an immediate & extreme risk of a high-speed rear-end collision. At times hazard lights didn't work causing family panic & screaming as truck shook with passing traffic. 3. The problem has been officially confirmed by Ron Smith GMC in Merced, CA. Their service department diagnosed the issue, confirming that the high-pressure fuel pump had locked up and subsequently destroyed the timing belt/chain & engine gears. 4. The vehicle and its failed components have only been inspected by technicians at the Ron Smith GMC dealership service department. No police, insurance representatives, or outside third parties have inspected the vehicle yet. 5. I had been extremely happy with my truck and there were absolutely no warning lamps, dashboard messages, or driving symptoms prior to the failure. The truck was operating perfectly normally under cruise until the exact moment of the failure, at which point a "Reduced Engine Power" warning flashed on the dashboard simultaneously with the mechanical lock-up, shaking, and immediate stall. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF

Filed Sep 30, 2026 · Engine, Fuel system · CA

1. I am being told that the high-pressure fuel pump (HPFP) catastrophically seized and locked up internally while driving. Because the HPFP on the 3.0L Duramax (LM2) engine is directly driven by the engine's timing system, this sudden mechanical seizure instantly destroyed the engine timing gears and snapped/skipped the timing chain. The failed components are currently intact inside the vehicle and are fully available for inspection upon request at Ron’s Smith GMC in Merced, CA. 2. The failure occurred on busy Labor Day (XXX) while our family of [XXX] was traveling back home at 70 mph on a major highway. The truck violently shook, instantly lost all engine power, and forced the vehicle into a dangerous limp-mode state before completely stalling in live highway traffic at night around 10:45 pm. This sudden loss of propulsion at high speed severely compromised our ability to safely navigate out of the way of fast-moving highway traffic, creating an immediate & extreme risk of a high-speed rear-end collision. At times hazard lights didn’t work causing family panic & screaming as truck shook with passing traffic. 3. The problem has been officially confirmed by Ron Smith GMC in Merced, CA. Their service department diagnosed the issue, confirming that the high-pressure fuel pump had locked up and subsequently destroyed the timing belt/chain and engine gears. 4. The vehicle and its failed components have only been inspected by technicians at the Ron Smith GMC dealership service department. No police, insurance representatives, or outside third parties have inspected the vehicle yet. 5. I had been extremely happy with my truck and there were absolutely no warning lamps, dashboard messages, or driving symptoms prior to the failure. The truck was operating perfectly normally under cruise until the exact moment of the failure, at which point a "Reduced Engine Power" warning flashed on the dashboard simultaneously with the mechanical lock-up, shaking, and immediate stall. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF