Electrical System Problems of GMC Sierra 1500 - part 1

Every time I pull the truck into my garage or a parking stall at low speeds while using the front park sensor it will shut off with the automatic start stop while still in motion. Then you have to let off the brake pedal for it to start and sometimes the vehicle will search forward.

See all problems of the 2022 GMC Sierra 1500 🔎.

I purchased a 2025 GMC denali a few months ago. At approximately 7,000 miles, the front brakes failed unexpectedly and were replaced by the dealership. However, by 14,000 miles, I began experiencing brake issues again. Before I could return the vehicle for service, I was driving on the turnpike when the engine suddenly seized without warning. This created an extremely dangerous situation—vehicles behind me nearly collided as I lost power and control. I managed to pull over safely, but the tow truck operator struggled to load the vehicle due to all four wheels locking up and the engine being completely seized. Once the vehicle was inspected at the dealership, I was informed that the engine had failed and would need to be replaced. I am aware of the recurring issues associated with the 6. 2l GMC engines and related component failures, and I no longer feel safe driving this vehicle. Given the repeated mechanical failures and the serious safety risks involved, I am formally requesting that GMC initiate a buyback of this vehicle. I believe this situation qualifies under lemon law protections and warranty obligations, and I urge GMC to take immediate action to resolve this matter.

I am experiencing a recurring issue with my 2021 GMC sierra where the dashboard displays a “shift to park” warning even though the vehicle is already in park. This typically occurs when I attempt to shut off the vehicle. The doors unlock as expected, confirming the truck is in park, but the warning prevents me from turning off the ignition immediately. After a few seconds, the warning usually disappears, allowing me to shut off the truck. This issue is more frequent in cold weather, suggesting a temperature-sensitive electrical or mechanical fault. Based on research and community reports, this appears to be a known issue across multiple gm vehicles, often linked to a faulty micro switch or wiring harness in the shifter assembly. I am concerned about the safety implications, especially if the vehicle fails to shut off properly or if the issue worsens over time. Gm has not issued a recall for this problem, and I believe it warrants further investigation due to its widespread nature and potential risk.

See all problems of the 2021 GMC Sierra 1500 🔎.

Vehicle (2019 GMC sierra slt x31!crew cab 6. 2 l gas engine) stopped running while driving down the road (Wednesday 9/3/2025). Tried to start truck - would crank over quickly but failed to start ( crank no start with no check engine light. ) tried several times same result. Started after about 5-10 minutes and was displaying low fuel indicator even though we knew it had approximately 1/2 tank. We immediately put gas in it and it took approximately 1/2 tank to fill. Still no check engine light and confirmed no stored codes via onstar report. Drove the truck around for may 1hr and check engine light came on but was still running and did not stop running like it did earlier. On star reported ecm system code p129f ( fuel pump or fuel pump power control module). Long story short, put truck in independent repair shop I use. They diagnosed it was a defective fuel pump located in fuel tank. They told me gm technical support recommended to replace the fuel pump and fuel pump power and control module at a cost of ~$1325. 00. It is my opinion this is a safety hazard and very similar if not exactly the same failure symptoms / modes as others have already reported. I requested to keep the failed parts and still have them in my possession. Please review and let me know if you need or want additional information . Best regards, bruce rivera 512-924-9839 riveratb176@gmail. Com.

See all problems of the 2019 GMC Sierra 1500 🔎.

--radio power button inoperative --radio channel change buttons, to left of steering wheel inoperative (everyday) --radio volume inoperative -just stops working (sometimes) --radio “home” button, left of radio power button inoperative --driver door mirror wobbles when above 50 mph (very distracting when driving) --driver door hard to close and out of alignment --dealership is selling the vehicles knowing some of the issues are present, but not advising the buyer. My safety is/was at risk due to having to move my hands off the steering wheel to touch the radio display to make any changes while driving. A certified gm service dept confirmed all my issues and could not repair. They quoted a pit 6408. However, this particular pit does not address my issues/concerns.

Power button (to turn on and off) to radios does not work, the "home" button to the left of the radio power button does not work.

1. While driving slow or making a right hand turn the vehicle turns itself off 2. Periodically the car does not start/no power and does not respond to keyless car lock 3. Periodically the dashboard panel lights will not turn off, flash or some will go off but not all all of the above have been a twice repaired GMC recall 17276 and has been occurring since 2020.

See all problems of the 2014 GMC Sierra 1500 🔎.

I drove into my driveway put vehicle in park put my window shades up and vehicle went into drive and hit my garage. I had no warnings and this was caught on my ring camera. The ring camera caught my headlights lite up on outside edge and lights kept blinking off an on like there was some kind of glitch. My. The vehicle did not brake either. I saved the video. [xxx] information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

The cameras will work after the vehicle sits for awhile like after it cools down. But once driving or letting the vehicle run awhile the cameras shut down. I think the video processor module gets hot and shuts down. General motors is looking into this issue.

Was driving down the freeway around 65 miles an hour attempted to pass a truck when the steering started wobbling the abs that ems and the breaking system came on with the check engine light almost had no control and barely avoided having an accident the only way it went back to normal was slowing down.

See all problems of the 2020 GMC Sierra 1500 🔎.

The vehicle has suffered repeated systemic electrical failures all while being under 8,000 miles. What component/system failed? power distribution/fuse block, starter, fuel pump control module, horn circuit, body control module, instrument cluster, and charging system. Error codes documented include p0627 (fuel pump control circuit), u0100 (lost comm ecm/pcm), b1325 (control module power low), u0140 (lost comm bcm), and b1000 (ecm fault). All repairs are documented by the dealer, and the truck remains available for inspection. How was safety at risk? the truck lost propulsion at speed, emitted smoke from the engine bay, and became disabled in traffic, placing my family, including my toddler, in immediate danger of collision and fire. Electrical defects also disabled horn and instrument cluster, removing critical warning and signaling functions. These electrical issues have been ongoing for months and gm refuses to replace and can't seem to fix it. Has it been confirmed? yes. Each failure was diagnosed and confirmed by an authorized gm dealer. Components replaced include fuse block, starter, fuel system computer, horn assembly, and cluster. Despite repairs, issues recur. Inspected by others? gm corporate case managers are aware and have acknowledged defects, though they have refused to issue written determinations. Insurance has not yet been involved, but records are available. The dealer has attempted to repaid more than 4 times with no success. Warning lamps/messages? yes. Prior to and during failures, vehicle displayed repeated “service electrical system,” “low voltage,” and communication fault codes. Cluster intermittently blacked out. Smoke in engine bay indicated immediate fire hazard. Cumulative out-of-service days exceeding 20. The failures pose unacceptable risk of fire, sudden propulsion loss, and loss of critical safety functions. I have all calls with gm recorded and transcribed as I am in SC (single party recording state) and can provide those.

See all problems of the 2023 GMC Sierra 1500 🔎.

Reverse lights stay on. Causing the battery to drain. The fuse box under the hood is prone to go bad. Even with no corrosion. Gm knows this and has not fixed the issue. Its a common problem going back many years. The need to upgrade the fuse box under the hood & the wiring harnesses. My taillight harnesses were completely burned up. The truck could of caught fire. This should be a recall. Instead gm wants to take the money they are making off all the fuse boxes they are selling.

See all problems of the 2017 GMC Sierra 1500 🔎.

Unknown. Battery goes into protection mode.

2021 GMC Sierra 1500 [xxx] miles 36,500. My childs seatbelt does not work and the lane keep assist does not work information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

2018 GMC sierra slt's electric power steering suddenly stopped working, I almost got killed this issue has been reported by other owners.

See all problems of the 2018 GMC Sierra 1500 🔎.

On July 31, 2025 while traveling on a highway, the vehicle lost drive power—the gear selector would not remain in drive and reverted to neutral for approximately 10 minutes. This created a serious safety hazard due to sudden loss of propulsion in moving traffic. The event was captured by onstar, which emailed an automated incident alert. I later received a gm safety recall notice concerning potential engine loss of propulsion for vehicles with the 6. 2l l87 engine (NHTSA 25v-274 / gm n252494000/001/002). I presented the vehicle to ewing Buick GMC (plano, TX) on July 23, 2025 for recall service and retrieved it on July 28, 2025. Approximately one week later, during an interstate trip to kansas city, the engine catastrophically failed about one hour from my destination, leaving the vehicle disabled on the roadway shoulder. Roadside assistance towed the truck to briggs auto (KS). Briggs auto diagnosed engine failure and ordered a replacement engine. I was informed the engine is on back-order with no estimated arrival, and the shop is under-staffed, prolonging repairs. The vehicle remains out of service. The sequence—pre-recall loss of propulsion, post-recall service, and then engine failure within a week—shows a serious safety defect that can lead to sudden loss of power at highway speeds, risking a crash. Frequency: loss of propulsion occurred at least twice (March highway incident; subsequent engine failure in early August). Warning lights/messages: [gear refuse tom shift to drive mode. ] injuries/crashes: none, but risk was substantial due to sudden power loss. Dealer involvement: ewing Buick GMC (recall visit); briggs auto (diagnosis/engine order). Attachments/supporting docs: onstar email, recall notice, repair orders, tow documentation, photos/video. Please investigate whether 2024 GMC sierra trucks with the 6. 2l l87 engine continue to pose a loss-of-propulsion risk after recall service and whether parts shortages/back-orders are delaying effective remedy.

See all problems of the 2024 GMC Sierra 1500 🔎.

Truck will down shift and transmission will slam, super hard. Feels like I hit something. Almost causing accident. Dealership refuses to service my truck or even take a look at the transmission because "its not broken yet" in their words " it needs to fail before they can service it or even look at it, because they wont get paid. " I have expressed my concerns about this safety issue and at this point they are being negligent. My truck is a 2023 GMC Sierra 1500 with 3. 0 duramax . Still under warranty with only 35k miles.

The backup camera visibility at night is poor, making it very difficult to see behind the vehicle. This poses a potential safety hazard for pedestrians who may be in the path while reversing.

My 2022 GMC Sierra 1500 shows message "shift to park" when turning off, even though it has been shifted to park. Have to play with shifter to get it to stop, sometimes turning it back on and off will do trick. Locking it with remote works most of the time but this last time it took over 10 minutes .

Loose steering and sometimes steering wheel wants to return to center when this happens I loose all electrical - dash goes blank engine dies etc. The hot battery cable is very hot to the touch. I disconnected the ground cable and wait a few minutes and power returns this is going to cause a wreck if it is not corrected local dealer says could be bad battery I had already changed it there is a place to say when this occurred it has happened several times over the last year the last 2 times were within a week.

See all problems of the 2016 GMC Sierra 1500 🔎.

The contact owns a 2019 GMC Sierra 1500. The contact stated while driving approximately 45 mph, the message "battery saver alert" was displayed on the instrument cluster. The contact stated that the battery gauge was reading 9v on the 12v battery. The vehicle was driven to a dealer. The dealer diagnosed the vehicle and determined that a battery tender was needed. The contact asked the dealer to check the 12-volt battery which was replaced 2 years prior by the same dealer. The dealer diagnosed the vehicle and determined that the alternator needed to be replaced. The contact was later informed that the battery fuse also needed to be replaced. The vehicle was repaired. The manufacturer was not informed of the failure. The contact researched online and related the failure to NHTSA campaign number: 19v888000 (electrical system); however, the VIN was not included in the recall. The failure mileage was 43,742.

Tail gate keeps opening.

Onstar module failed.

The contact owns a 2021 GMC Sierra 1500. The contact stated that there was an abnormal change with the rpm. There were no warning lights illuminated. The contact received notification of NHTSA campaign number: 25v274000 (engine and engine cooling); however, the part to do the recall repair was not yet available. The local dealer was contacted. The dealer received an email from the manufacturer, but the verbiage was incorrect to move forward with the repair. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The failure mileage was approximately 39,000. VIN tool confirms parts not available.

At low speeds when applying the brake, whether in a turn or traffic, the vehicle will shut off completely. This has happened multiple times and has almost caused accidents on a few occasions. It has also happened while just driving down the road, the entire truck lost power and then came back, the windshield wipers came on as well.

See all problems of the 2015 GMC Sierra 1500 🔎.

While driving on the highway at 70 mph, the truck experienced a harsh transmission shift followed by a sudden loss of acceleration and entered shutdown mode to protect the engine. The steering became stiff, all dashboard warning lights illuminated, and a message appeared on the driver display indicating a transmission issue and advising to drive with caution. The rpms surged and the truck struggled to maintain a speed of 45 mph while the remaining at 4000 rpm. This created an extremely hazardous situation for both me and my passenger. I safely pulled into the breakdown lane, came to a complete stop, shifted into park, and turned off the engine. Upon restarting the vehicle, the check engine light remained on, and the transmission continued to shift abnormally at low speeds, including noticeable shuddering.

This is the second time in 2 days!! while driving ~35mph the truck experienced a harsh transmission shift followed by a sudden loss of acceleration and entered shutdown mode to protect the engine. The steering became stiff, all dashboard warning lights illuminated, and a message appeared on the driver display indicating a transmission issue and advising to drive with caution. This created an extremely hazardous condition for me while driving on s busy stretch of road. I pulled onto the side of the road, came to a complete stop, shifted into park, and turned off the engine. Upon restarting the vehicle, the check engine light remained on, and the transmission continued to shift abnormally at low speeds, including some noticeable shuddering. My GMC application recorded the issue and reminded me to schedule service.

Truck completely shuts off at any speed going down the highway. Complete loss of power. Have to coast to side of road and restart vehicle.

Truck randomly shuts off and steering wheel locks up going down the road.

Tailgate opened several times without being prompted. Once while driving, two times while in park.

Per my dealership, there is chaffing in the main wiring harness of the vehicle and the entire harness needs to be replaced. On recall n222391510, for sierra's of the same year, the harness had to be replaced as well.

Subject: urgent vehicle safety complaint – 2019 GMC sierra denali escalating mechanical and electrical failures — many beginning before 100,000 miles, and continuing as of today, at approximately 110,000 miles. These issues have made the vehicle unreliable and unsafe to drive. Since purchasing the vehicle, I have had it serviced regularly and reported that it was driving rough, jerking into gear, and showing early signs of engine and transmission problems. These issues were noted during multiple multipoint inspection services, yet no lasting solutions were provided. Major issues have included: •engine performance failures •fuel injector malfunction •serpentine belt and idler pulley damage •a/c compressor belt failure •power steering malfunctions •vehicle stalling at traffic lights •loss of power on major highways •rear window water leaks •significant and ongoing electrical system problems •shaking when brakes applied after having brakes and rotors replace in March •screen monitor going out after paying over $ 900 dollars for updated software and repairs to the electronic component that cost over $2500. Despite continued maintenance, on Thursday, July 3, 2025, my truck began losing power and smoking heavily while driving on a busy highway in georgia. My grandchild, who was riding with me, yelled, “grandma, it’s smoking — please get out!” as we pulled off the road in fear of a fire. This terrifying incident left us stranded and emphasized just how dangerous this vehicle has become. I filed a formal complaint with the GMC corporate office, but no support provided or an investigation. Over the past six months, I have spent more than $5,000 trying to keep this vehicle operational. So many critical systems have failed, despite consistent maintenance, raises serious concerns. Finally, the fuel injector repaired 3 days later a message on dashboard displaying service tire monitor system and steering wheel shaking when brakes are applied.

I've had the vehicle service twice for the same incident power steering shut off in the middle of drive vehicle shuts down almost smashed into a freeway wall. This has been to the dealership numerous times to fix it and they have not. We are in the tens of thousands of dollars in repair and still nothing is fixed I've had this vehicle for 5 years it's been in the shop for at least 3 I bought it with 30000 miles it only has 61000 on it right now the last repair lasted 10000 miles this repair only lasted 4000 I almost died and was left is petrified.

Intermittently there isn't any sound from informational center speakers, this includes not sound of the turn signal indicators working. No sound from any vehicle component, vehicle has the current software release from gm. The only way I've found to get sound again is to leave the vehicle set not running for some period of time, short off then back on doesn't seem to clear the issue. I've check with the dealer and from what I understand this is a known issue with 2024 & 2025 gm informational centers.

Power steering works sometimes and then stops trailer break system issues.