2019 GMC Sierra 1500 Electrical Problems

I am retired and have always bought GM vehicles which are taken care of with required oil changes etc. This one I have only owned 25,000 mi each year (I have owned two years). So, when purchased it has high 50,000 miles not sure of exact, and it has only been driven 2 years. When calling escalation at GM, they act as though it doesn't matter and too bad. 110,000 miles and the truck needs a new motor. This is what we are told and 10,000 more than the initial 1500 to tear it down. This truck is not broken due to us, this is a problem with the manufacturer and the responsibility needs to be addressed. My husband has a heart issue and he almost didn't make it home. I'm not accepting that nothing be done, since next we need a lawyer and a media appointment. This isn't right when you see thousands of people with the same GMC Sierra trucks online with complaints of the same valve and motor issues. This needs completely replaced and not by a customer, by the manufacturer. How can 1500 people new wrong on one sight stating the same as we have had. This person who is responsble for reporting and making sure we are safe needs to be fired. I am writing my representatives, senators etc to let them know this is going on. No one should pay for the mistakes of bad engineering. PERIOD.

NHTSA ID

11746005

Incident

Jun 19, 2026

The contact owns a 2019 GMC Sierra 1500. The contact stated that the trailer lights flashed intermittently while the vehicle is turned off. Additionally, the contact stated while driving with a trailer hitched to the vehicle, the messages "Trailer Disconnected" and "Trailer Connected" were intermittently displayed, and the running and marking lights were inoperative. The contact related the failure to GM TSB Numbers: 20-NA-198 (Trailer Running Lights Shut Off Due to Excessive Load on the Running Lamp Circuit), PIT5747B (Diagnostic Tip - Trailer Lighting Complaints with Trailering App RPO U1D) and N192213550 (Service UpdateTrailer Integration Module Software Error). The vehicle was taken to an independent mechanic, where it was determined that the failures were due to a wiring or software failure. The contact was informed that the failure was a factory defect because the fuses were in good condition. The vehicle was not repaired. The dealer and the manufacturer were not contacted yet. The failure mileage was approximately 64,000.

NHTSA ID

11741465

Incident

Jun 2, 2022

Mileage

64,000 mi

I am getting warning signs on the dashboard saying that my brake booster performance has failed and I need to service the brake booster , the brakes are very hard to press, I need longer stopping distances,and traction control and stability control towing harness my speed has been limited to 43 mph and it's saying that the mass air flow system is has low circuit

NHTSA ID

11735386

Incident

Dec 31, 1969

The contact owns a 2019 GMC Sierra 1500. The contact stated that while driving approximately 45 MPH, the accelerator pedal was depressed; however, the vehicle lost automotive power and stalled. Several unknown warning lights were illuminated when the vehicle stalled. The contact was unable to restart the vehicle, and the vehicle was towed to the residence. The contact became aware that the 400 AMP fuse was blown. The contact replaced the fuse and replaced the starter, however during a test drive, the vehicle stalled. The vehicle was taken back to the residence, and a 400-AMP fuse was replaced a second time. The contact also replaced the starter, the alternator and replaced the ground cables, and during another test drive, the vehicle stalled. The vehicle was taken back to the residence and the contact determined that the engine had seized. The vehicle was not repaired. The manufacturer was informed of the failure. The contact researched online and related the failure to NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the VIN was not included in the recall. The failure mileage was approximately 159,000.

NHTSA ID

11731823

Incident

Jan 17, 2026

Mileage

159,000 mi

The contact owns a 2019 GMC Sierra 1500. The contact stated that while driving at various speeds, the vehicle lost automotive power; however, the vehicle maintained electrical power. The check engine warning light was illuminated. The vehicle was towed to a local service center, where it was diagnosed and determined that the battery needed to be replaced. The vehicle was repaired; however, the failure reoccurred. The vehicle was taken back to the same local dealer and remained for additional investigation. The contact attempted to restart the vehicle several times and shift into different gears; however, the failure reoccurred. The local dealer was contacted, but the vehicle was not diagnosed or repaired. The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 103,000.

NHTSA ID

11728443

Incident

Feb 25, 2026

Mileage

103,000 mi

THE PARK ASSIST WOULD GO ON WHEN I WAS AT A STOP LIGHT AND NO ONE WAS IN FRONT OF ME AND AUTO STOP WAS OFF ALL THE TIME. TWO GROUND STRAPS WERE CORRODED. THERE IS A RECALL ON THEM FROM 2019 TO 2024. MY TRUCK DID NOT HAVE A RECALL ON IT. I JUST WANT TO LET YOU KNOW AND MAYBE IF ENOUGH PEOPLE COMPLAIN, YOU WILL PUT ALL TRUCKS ON THE RECALL.

NHTSA ID

11727566

Incident

Feb 14, 2026

THE VEHICLE IS AVAILABLE FOR INSPECTION - 35,000 APPROXIMATE MILES WITH A EBCM MODULE REPAIR NEEDED IN ORDER TO REPAIR IT TO A LEVEL THAT MEETS FEDERAL MOTOR VEHICLE SAFETY STANDARDS OF AT MINIMUM S5.3 NO.126 & S5.1 NO. 135 - I BELIEVE THIS VEHICLE SHOULD HAVE BEEN/SHOULD BE INCLUDED IN THE ORIGINAL AND/OR EXPANDED RECALL N192268091. THE VEHICLES ELECTRONIC BRAKE ASSIST IS NOT WORKING CAUSING IT TO BE DISABLED. IT HAS BEEN INSPECTED BY DENNY MENHOLT GMC. WARNING LAMPS/MESSAGE OCCURRED - DIAGNOSED - REPAIR NEEDED TO MAKE THIS VEHICLE SAFE FOR THE DRIVER, PASSENGER(S) AND OTHERS WHEN THE VEHICLE IS OPERATING.

NHTSA ID

11707766

Incident

Jun 13, 2025

I was driving up the road truck cranked up fine started a morning commute, on cruise control the truck instantly out of nowhere lost power completely with no signs of anything and engine won’t attempt to turn over now. I fear the worst has happened which would be catastrophic internal failure for to a faulty engine & its internals.

NHTSA ID

11706910

Incident

Dec 23, 2025

The contact owns a 2019 GMC Sierra 1500. The contact stated while driving at an undisclosed speed, the vehicle jerked and failed to accelerate as intended while depressing the accelerator pedal. There was an abnormal sound coming from the transmission. The message "Reduced Engine Power” was displayed and the transmission warning light was illuminated. The vehicle was taken to the dealer and the transmission was repaired. The contact stated that the failure persisted. The vehicle was taken back to the dealer, and the transmission was replaced. The contact stated that on a separate occasion, the A/C failed to function as intended. The contact had to drive for fifteen minutes for cold air to come from the A/C vents. The vehicle was taken to Houston Cadillac and the vehicle was repaired. The contact stated that the failure persisted. The dealer diagnosed the vehicle and informed the contact that there was a short circuit. However, no cause for the short circuit failure was found. An unknown repair was done on the vehicle. The contact stated that the failure persisted. The check engine warning light was illuminated. The contact stated that on a separate occasion, there was an abnormal sound coming from the steering wheel. The vehicle was taken to Payne Rio Chrysler Dodge Jeep Ram, where it was diagnosed that one of the bolts found on the steering column was missing and the other bolt was loose. The vehicle was repaired. The contact was informed that the A/C condenser had failed. The vehicle was repaired. The contact stated that the failure persisted. No warning lights were illuminated. The vehicle was taken back to the dealer. The entire A/C assembly was replaced. The contact stated that the failure had occurred soon after the vehicle was purchased. The manufacturer was not notified of the failure. The failure mileage was unknown.

NHTSA ID

11704348

Incident

Apr 24, 2023

Complete engine failure. I was driving approximately 55 miles an hour, then all of a sudden the cruise control automatically shut off and a series of alarms are triggered. When pressing the accelerator pedal, the engine vibrated excessively in Cleary indicated catastrophic engine failure. I was lucky enough to make it to the nearby dealer who confirmed a complete engine failure. I ended up buying a new vehicle that day to avoid being stranded.

NHTSA ID

11701098

Incident

Oct 21, 2025

my engine went out with no lights or warnigns prior to engine going out. Now we still making payments for the truck,expensive truck and we haven't use it because we dont have the money to fix it.

NHTSA ID

11700926

Incident

Dec 4, 2023

The contact owns a 2019 GMC Sierra 1500. The contact stated that while driving at 25 MPH and making a turn, the vehicle lost motive power. There were several unknown warning lights illuminated after the failure. Upon investigation, the failure was related to NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling). The vehicle was towed to an independent mechanic, where it was diagnosed with lifter failure and camshaft damage. The vehicle was repaired. The local dealer was not contacted. The manufacturer was contacted and opened a case, and referred the contact to the local dealer for assistance. The failure mileage was approximately 86,960.

NHTSA ID

11698989

Incident

Oct 27, 2025

Mileage

86,960 mi

This truck needs 2500.00 in work to replace Electrical Harness after months of problems and evaporating leaks.

NHTSA ID

11694308

Incident

Oct 18, 2025

My truck has a blue screen that appears randomly on occasion that states service rear view system. This is a major safety concern. And after reading online it is a very common occurrence on 2019-2025 gm pickups. It needs to be recalled and a for sure fix done to prevent from backing into someone or something. I have small children and my biggest fear is running them over while playing in the yard and I rely very much on my rear view/360 camera to make sure this doesn’t happen even after double and triple checking they are no where near danger before stepping in my vehicle.

NHTSA ID

11692468

Incident

Apr 1, 2025

Vehicle (2019 GMC Sierra SLT X31!Crew Cab 6.2 l gas engine) stopped running while driving down the road (Wednesday [XXX]. 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, [XXX] [XXX] [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ID

11685410

Incident

Sep 3, 2025

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.

NHTSA ID

11680319

Incident

Jul 3, 2025

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.

NHTSA ID

11678824

Incident

Jul 22, 2025

Mileage

43,742 mi

My 2019 GMC Sierra Denali shut off suddenly while I was stopped in traffic. The engine died, the steering wheel locked, and the dashboard displayed warning messages including “ESC,” “power,” and another I didn’t catch. The truck would not restart despite attempts. The check engine light is now on. This happened without warning, and I had no prior mechanical issues. The vehicle is well maintained, garage-kept, and recently received a full service including oil change, brake work, and 75K-mile recommended service. I fear this is related to a known issue affecting other GMC engines under investigation for sudden power loss.

NHTSA ID

11665652

Incident

Jun 7, 2025

Ok I know my vin don't go under the 10 recalls for 2019 gmc sierra limited 1500 rwd, but my truck has the same problem with the brake module has those recalls I feel like gmc might have used different parts for the other recall but used the same brake module for my truck cause I have that same problem has the recall. It's obviously a issue that needs to be look in and my brake module should be fixed by gmc

NHTSA ID

11661191

Incident

Mar 5, 2025

I’m contacting you regarding my 2019 GMC Sierra 1500 with the 5.3L V8 engine. The vehicle is currently experiencing a cylinder 8 misfire (code P0308), accompanied by engine backfiring, ticking noise, and exhaust fumes inside the cabin. Additionally, the ESC (Electronic Stability Control) warning light is on, and performance is noticeably affected. To date, I have: •Replaced all spark plugs and fuel injectors •Verified proper ignition coil function •Had an oil change on September 23, 2024, during which I reported early concerns about engine performance (shortly after the powertrain warranty expired) •Had a transmission flush on March 17, 2025, in an attempt to resolve continued drivability issues Despite these efforts, the issue persists. Given the known issues with AFM lifters and camshaft wear on this engine, I suspect a mechanical failure related to that system.

NHTSA ID

11659222

Incident

May 1, 2025

Just purchased this vehicle, at 84000 miles had engine failure and electrical issues while traveling down interstate with my family. Lost power steering and all warning lights popped up. Safely exited busy interstate -- avoided major accident. This engine should have been included in the recent GMC recall - After a diagnostic $7000.00 plus to fix. UNSAFE ENGINE ISSUE!! Please help the consumer!!

NHTSA ID

11658622

Incident

Apr 16, 2025

Rear sliding glass window is leaking water around the exterior frame. This is addressed in TSB 18-NA-383 but not covered under any warranty. My rear seats and carpet are becoming wet. I am concerned about the possibility of mold and an electrical short/fire resulting from water intrusion. There are many reports and discussions on the internet regarding this issue. Full window replacement estimated at $1300. Patchwork repair with caulk is estimated at $600 with no guarantees of success. I would expect GMC to cover the replacement of the rear glass in kind and remedy any other damage to my vehicle due to water intrusion into the cabin area.

NHTSA ID

11657067

Incident

Apr 1, 2024

WHILE TURNING INTO A BUISNESS FROM A HIGHWAY, THE LOW FUEL WARNING CAME ON EVEN THOUGH I HAD JUST FILLED THE TANK. UPON LEAVING THE BUISNESS, I STARTED THE TRUCK AND PUT IT INTO REVERSE AND THE ENGING STALLED. RESTARTED THE TRUCK AND PUT IT INTO REVERSE AGAIN AND IT STALLED AGAIN. RESTARTED AND TRIED GOING FORWARD AND IT RAN FINE. ABOUT 1 MILE DOWN THE ROAD THE LOW FUEL WARNING CAME ON AGAIN AND THE ENGINE STALLED WHILE TRAVELING APPROXIMATELY 35 MPH. AT THIS POINT I REALIZED THAT THE DOORS HAD UNLOCKED AND THE INSTRUMENT CLUSTER GAUGES KEPT SWEEPING UP AND DOWN. I TRIED TO RESTART THE ENGINE BUT IT WOULD NOT TURN OVER. IT ACTED LIKE THE BATTERY WAS DEAD. AFTER WATING SEVERAL SECONDS, I TRIED AGAIN AND THE ENGINE RESTARTED. I NOTED THE BATTERY VOLTAGE IN THE INSTRUMENT CLUSTER AND IT WAS NORMAL. NO WARNING LIGHTS ON IN THE INSTRUMENT CLUSTER. NO DTCS PRESENT WHEN CHECKED WITH A GENERIC SCAN TOOL. MY SAFETY WAS PUT AT RISK BECAUSE THE ENGINE STALLED WHILE DRIVING IN TRAFFIC. I HAVE NOT TAKEN IT TO THE DEALER YET AS THEY ARE NOT OPEN TODAY AND I WANTED TO REPORT THIS WHILE ALL THE DETAILS WERE FRESH ON MY MIND.

NHTSA ID

11655587

Incident

Apr 19, 2025

I had engine failure two weeks after a schedule maintenance that included a tune up. When the engine failed all the components made the vehicle impossible to operate much less bring to a stop safely. I had to get the vehicle towed to the dealer. The dealer confirmed that the engine (6.2 V8) has a known documented issue. The vehicle is at my dealer with the engine being disassembled. There weren't any warnings as I stayed on the maintenance schedule that the dealer mapped out since my purchase. The problem began [XXX]. After researching the issue I found this online. That is how I found your web site. [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ID

11655350

Incident

Apr 12, 2025

Transmission keeps skipping missing gears and hard shifting, as well as jolting forward. When attempting to switch lanes vehicle transmission skips. When being placed from Park to drive or any other gear vehicle transmission hard shifts. Vehicle radio and screen shut off intermittently every 30 to 45 minutes. Vehicle screen goes blank and black and resets itself after 30 to 45 minutes.

NHTSA ID

11654048

Incident

Apr 11, 2025