general problems of the 2019 GMC Sierra 1500 - part 2

On January 15, 2026, my wife was driving our 2019 GMC 1500 sierra denali and the lights on the dash came on with the truck losing power. I made to my wife later in the day and was able to drive the truck to the dealership only achieving 15mph for about 5 miles. The mike bell Chevrolet dealership in carrolton GA stated that my engine was knocking and needed to be replaced. I took my truck the john thornton Buick GMC dealership on January 22 to get a second opinion and they stated the exact same thing stating the engine needs to be replaced. The dealership is stating the remanufactured replacement issue is over $10,900. My truck has over 271,000 miles.

The oil cooler line is leaking, and the vehicle is available for inspection upon request. This safety concern is addressed under gm program n192220080. The hazard is present: the leak is active. The risk of total line detachment and engine seizure is the same in texas as it is in alaska (the us state the GMC recalled the exact same part). An engine seizure and loss of propulsion is an immediate danger to passengers within the effected vehicle, as well as the other vehicles on the road. The admission of defect: gm’s offer to provide the part (part #85136335) confirms that my vehicle’s hardware is part of the failed batch. The vehicle was inspected by an authorized GMC dealership on 01/14/2026, confirming the leak and potential safety hazard with continued driving of the vehicle. The issue was submitted to the gm customer care team, case #[xxx]. The only warning of the defective oil cooler line leak was oil on the ground underneath the vehicle after driving. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

I am an owner of the same year, and model GMC Sierra 1500 included in the gm customer satisfaction program n212326940, which is the oil cooler line failure. However, my VIN was not included in the program despite experiencing the exact same failure the program covers. My safety and the safety of others is put at risk because the failure may cause an immediate loss of oil pressure or propulsion while driving. This is a huge safety hazard, since loss of vehicle control may occur. My vehicle has been inspected by a certified gm dealer and they confirmed the oil cooler line has failed and must be replaced. I have not experienced any warning lights, but my vehicle is leaking an excessive amount of oil. The vehicle is no longer safe to drive until repaired.

My vehicle recently experienced a sudden flashing check engine light, severe misfiring, and rough engine operation, creating an unsafe driving condition. An inspection by an authorized GMC dealership, serra Buick GMC champaign, confirmed a failed deactivating valve lifter on cylinder 5, documenting that the lifter ceased movement after a single engine rotation. The dealership advised that the failure necessitates replacement of all lifters and extensive internal engine components, at an estimated cost of $5,650. 75. This defect is not isolated, unforeseeable, or the result of consumer misuse. It is directly associated with general motors’ active fuel management (afm) system, which has been widely reported to cause: •premature lifter collapse •camshaft damage •severe engine misfires •loss of power while driving •catastrophic engine failure.

While driving vehicle at highway speeds the vehicle shut down without any warning.

Manifold. I use my truck daily for my job. I was coming home every night, tired with headaches not knowing why I was being poisoned. The manifold was leaking in the cab of the vehicle. This is a major safety issue when it’s poisoning people.

On Wednesday, January 7th, 2026, my wife and I were traveling north on the northeast extension of the pennsylvania turnpike (476) at approximately 9:00 pm. A check engine light came on with no other symptoms, we start to get off the next exit. While still on the highway, the motor turns off with a warning to put it in neutral and restart. It would not restart and coasted off the exit and into a convenience store parking lot. There was noise, just turned off. We got stuck in the town for over 2 days before getting a tow 209 miles to the mechanic shop. We were miles from any mechanic shop and tried to troubleshoot while waiting and to no avail. First mechanic had to send it to a second because it looked like the engine had seized and that was confirmed at the second mechanic shop. Apparently the bearings in the lower end seized. The only thing they could offer was to replace the motor. It had proper amounts of fluids and didn't overheat. The motor replacement is approximately $10,800. 00 in addition to having no vehicle there was additional towing and breakdown expenses (food and lodging for 2 nights and 3 days).

I own a 2019 GMC Sierra 1500 denali equipped with the 6. 2l l87 engine. On or around December 31, 2025, the vehicle developed a loud knocking noise from the engine that became worse with rpm increase. The truck was taken to a GMC dealership for diagnosis and repair under warranty/service contract coverage. The dealership initially diagnosed valvetrain-related failure and replaced multiple top-end components including lifters, rocker arms, camshaft-related parts, belts, pulleys, hoses, and associated hardware. After reassembly, the engine reportedly started briefly and then failed again. The dealership then performed additional teardown and determined the lower end of the engine had also failed. I was informed by dealership staff that rod bearing failure is “very common” on the l87 6. 2l engines. Due to the extent of the damage, the vehicle ultimately required a complete long block replacement. My truck remained out of service from approximately 12/31/2025 until 5/1/2026, a period of roughly four months. During that time, there were repeated delays involving diagnosis, inspections, warranty approvals, and additional teardown procedures. The vehicle had approximately 111,858 miles at the time of failure and had been regularly maintained. Prior to the engine failure, the truck exhibited abnormal engine ticking/knocking noises under load and higher rpm operation. The final repair performed was replacement of the engine long block assembly. I am submitting this report because the dealership indicated this type of lower-end/rod bearing failure is common on the gm 6. 2l l87 platform, and I believe this issue may represent a broader reliability and safety concern affecting other owners.

I live in illinois, my 2019 GMC Sierra 1500 slt has 51,318 miles on it as of 12/31/2025. What component or system failed or malfunctioned, and is it available for inspection upon request? engine oil cooler hose line detaching from crimp - small oil leak currently. Not yet fixed. Available for inspection. How was your safety or the safety of others put at risk? if this component fails, all oil from the vehicle will be lost and inoperable. This could cause a traffic accident, especially if towing a load. Has the problem been reproduced or confirmed by a dealer or independent service center? confirmed by an independent service center. I will be taking my vehicle to the local GMC service center for additional confirmations. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? no, but gm has acknowledged the issue through these customer satisfaction surveys (csp xxx/ xxx). Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? there has been no failure yet. A small oil leak was found on my garage floor. My issue is that this is a known issue in cold weather climates. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

The contact owns a 2019 GMC Sierra 1500. The contact stated that while driving at various speeds, there was an abnormally loud clamoring sound coming from the engine. There was no warning light illuminated. The vehicle was taken to a dealer, and the mechanic informed the contact that the engine might fail soon. The contact was able to continue driving the vehicle, but the contact was advised to bring the vehicle back if the failure worsened. The following day, the contact stated that the front of the vehicle started shaking with several unknown warning lights illuminated on the instrument panel. The vehicle was taken back to the dealer and remained with the dealer undiagnosed. The manufacturer was not notified of the failure. The vehicle was not repaired. The failure mileage was approximately 71,000.

There is a service bulletin on the engine oil cooler line failure. It leaks or becomes detached form the crimp joint. Mine is leaking from the crimp joint and GMC says my VIN is not covered under this bulletin. N192220080 if this is a known issue on these vehicles why am I having to cover the costs for replacing a known faulty part. GMC said I could bring it in and have them perform the repair at my cost. The nearest service department is 100 miles away. I have it at a local mechanic that says it will cost anywhere from $1300 to $1500 to perform the repair.

Engine started knocking so took to the GMC dealer they said the engine needs to be replaced.

Luckily, truck was sitting in idle waiting on my wife and daughter to leave the store so we could go home. Engine began to run rough, and then died. Would not restart. Had this happened just a few moments later while in traffic, it could have been catastrophic for our family. Gm dealership said the engine was nearly locked up and needed a new long block and several other ancillary parts. So far, we have no internal pictures and nothing was harmed externally.

5. 3l v8 l84 engine, 101,300 2nd owner slowed down for traffic and was accelerating back to 80 when sudden loss of engine power coinciding with cylinder failure happened. Dealership determined lifter was collapsed. Lifter 1 failure at interstate speeds. Collapsed lifter caused damage to camshaft required both components to be replaced.

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.

The contact owns a 2019 GMC Sierra 1500. The contact stated that while driving 75 mph, the vehicle failed to accelerate as intended while depressing the accelerator pedal. There was an abnormal sound coming from the engine. No warning lights were illuminated. The contact stated that on a separate occasion, while driving at an undisclosed speed, blue and white smoke was coming from under the hood. The contact pulled over to the side of the road, and the smoke ceased. The contact opened the hood and inspected the engine. The contact restarted the vehicle, and the smoke started coming from under the hood again. The messages "parking brake service required”, “reduced steering assist”, “proceed with caution" were displayed, and the check engine warning light was illuminated. The contact stated that while driving and coming to a stop, the engine jerked abnormally. The vehicle was taken to an independent mechanic, where it was diagnosed with oil intrusion into the spark plugs with a misfire in cylinder #6, and the piston rings were fractured, and there were scratches on the cylinder walls. The vehicle was not repaired. The contact stated that the failure persisted. The manufacturer was made aware of the issue. The contact was referred to the dealer for assistance. However, the contact was concerned about the damage to the engine and feared driving the vehicle. The vehicle was not taken to the dealer. The failure mileage was 71,799.

I have the l87- 6. 2 v8 and my crankshaft bearings burned up at highway speeds and the truck shut down. The is a massive recall on this engine for this reason but does not include the 2019 model and it most definitely should. The issue started in 2019 (not 2021).

The contact owns a 2019 GMC Sierra 1500. The contact stated that while driving at various speeds, the braking system had erroneously activated, causing the vehicle to abruptly stop in the middle of the road. The vehicle was towed to the local dealer, who diagnosed that the failure was caused by an engine malfunction of the number six cylinder. The vehicle was repaired. No further information was available. After retrieving the vehicle, the contact was driving approximately 10 mph when the failure reoccurred and the braking system erroneously activated, causing the vehicle to abruptly stop. During the incident, the driver's head slammed into the steering wheel, causing a head laceration. No medical treatment was required. The vehicle was towed back to the dealer. The cause of the failure was not yet determined. The manufacturer was notified of the failure, but no assistance was offered. The failure mileage was 120,000.

Friday night coming home. While entering my driveway. The check engine light came on. The engine sounded really bad. Rough idling. Saturday morning. Took it to a mechanic shop. While on my way to the shop, the truck had loss of power. The first mechanic shop told me that the truck was having engine failure. Was not sure at the time but the l 87 is known for having lifters and bearing failure. Monday the truck was taken to the dealership novak motors. For extended warranty, repair or possible engine replacement. It has been two weeks. Have not heard anything yet. But the timing of the incident was good. Because the engine failed when I was pulling in to my driveway.

I was driving in a city at 30 miles per hour no acceleration and no load. I lost oil pressure, dumped all the oil out of the crankcase and then the engine locked up. I had it towed to my mechanic shop that I have work done. The technician diagnosed it as a failed oil cooler pressure supply line. Where the solid steel line crimps to a rubber oil hose, that connection had not been applied enough pressure and the rubber line became separated from the steel line.

Engine cooler line detached from crimp causing engine to drain oil rapidly and engine seized. The oil pressure warning light came on, and the truck was immediately shut down (within 10 seconds). We were put at risk because we tried to coast out of traffic and park it on a shoulder to prevent being struck by oncoming traffic. Truck was towed to dealer where we were told the engine was seized and we would have to pay for a new engine. Digging into this further, gm had put a service bulletin for this exact issue out on this year of truck. (n212326940-01). I brought this up to the dealer and they told me that my specific truck wasn't included in the recall and wouldn't be covered.

The service engine light came on while driving on the highway. We took it to a GMC dealership and they scanned to determine a short in the oil pressure sensor. This was replaced then during the final check they found metal in the oil. The warranty company made them tear the engine apart where they found multiple area where the metal was worn down including the gaskets, rings, and cylinders. The warranty company continues to fight us to cover the whole invoice.

We were driving down a farm to market road at about 50 mph pulling an empty cattle trailer when we had a severe power loss, lots of dash lights and warnings. I noticed white smoke coming from the tail pipe. We limped it back to the house and unhooked the trailer and idled it into the Chevrolet dealership in portland TX. The dealership just called and they said the #5 cylinder failed, there is metal in the oil and it will need an engine replacement at a cost of over $11,000. 00. The truck is a 2019 and has just over 54,000 miles on it. No engine should fail at 54,000 miles and no company should sell one that does. Pulling a loaded trailer at highway speeds with a total engine failure could easily cause death to passengers and livestock. 12122025.

Just had my 2019 GMC Sierra 1500 denali engine fail. My truck has 75k miles oil changed regularly no codes, issues or dash lights. Recently had it at GMC I folsom California for a rear window replacement. Full inspection with no issues and nothing found wrong. Sunday 12/7 with my girlfriend and son in the truck about to get on the freeway felt a weird shift as I got on the freeway on-ramp. As I went to accelerate I had my traction control lights come on, lost power, and flashing check engine lights limped the truck off the side of the freeway and exited to a gas station. My truck wasn’t leaking anything and oil pressure was good but it sounds like popcorn was being made in my engine when it was on. Had my truck towed to folsom GMC and yesterday 12/8 got a call I need a new engine. Called gm corporate to talk to them and opened a claim. GMC dealership got an initial help with 15% of the bill telling me I would need to pay $13,315. Talked to the service advisor and they put in a request for help from gm. Today at 9:00 a. M. They offered 50% coverage and I was able to get a little more but it still has me paying $7,500 and it will be 2-3 weeks to get the repair done. The dealership also will be getting me a loaner vehicle. This dealership has not been great but with this they are trying and doing a lot. However 75k on a truck that does not haul or have heavy use and is 7 years old with no prior issues is crazy. I was told cylinder 8 showed a misfire. Once they opened it up there was damage to the pushrods, valves and lifters with significant metal throughout the motor. I’m still waiting for corporate GMC to get back to me and hoping they will help or offer more money off as this is still a very large bill for a single father of 2 around the holidays. I bought the truck used with about 32k on it in 2022 and have had no mechanical issues or codes related to the motor or transmission.

Ecm completely failed during drive no previous warnings.

Engine failure on 12/1/2025 16,253 miles and 591. 9 hours on vehicle. Vehicle has the 6. 2l engine. Towed to dealership.

Engine malfunction, had dealer look at truck and they said I needed a new engine, check engine light came on and a knocking noise appeared suddenly. Reading about 2021+ sierra with 6. 2 engine that has a recall with the same problem as mine. Wondering why that recall wasn’t extended to my truck as well.

Engine oil cooler lines leaking from crimp joints. "oil pressure low turn vehicle off" display showed on dashboard. Oil is present all over the bottom of my truck as well as a trail along the road and the parking lot where I parked it. I have not brought it to the dealership yet. There has been a customer service program notice about this issue, I got my truck after the issue was sent out so I did not get the letter or supposedly this truck is not part of it even thought it is the exact issue. Customer service program number n212326940.

The contact owns a 2019 GMC Sierra 1500. The contact stated that while driving approximately 60 mph, the vehicle started shuddering. The check engine and stabilizer warning lights were occasionally illuminated. The contact pulled over into a nearby gas station, and the vehicle was later towed to a local dealer. The vehicle remained at the local dealer, where it was diagnosed and determined that the engine needed to be replaced. The vehicle was not repaired due to the cost. The local dealer informed the contact that the failure was related to NHTSA campaign: 25v274000 (engine and engine cooling); however, the VIN was not included. The manufacturer was notified of the failure and referred the contact to the NHTSA hotline for assistance. The failure mileage was approximately 49,000.

On November 25th, 2025 I had my wife, kids and baby grandson in my truck driving approx 50 mph when the trailer brake light appeared on my dash. I thought that was strange since I was not pulling a trailer. Shortly after my truck felt like it was going to stall and complete loss of power. I pulled into a turn lane and coasted into a gas station parking lot. I put the truck into park and turned the motor off and then restarted it. The truck was running extremely poor and sounded like it had rocks loose in the motor. I had it towed into an automotive repair facility I have always used and they told me my engine was gone and had to be replaced. I had been told by an oil change company a few weeks before that this engine was under a recall. I checked into it but this model year was not included. I did further research and founded out that this model year was under review. Something needs to be done as I was lucky this was not a busy highway or this could have ended worse.

Less then 47 000 miles on truck, used for only city driving, no off road driving or rigorous travel. - engine malfunction and could have had catastrophic failure while traveling causing injury to myself or others. -car is inoperable, dealer recommend not to drive it due to safety concerns. -I have metal shavings in the oil, misfires, and a p0011 code. These match the known gm lifter/camshaft failure pattern. Vehicle started skipping check engine light turned on for cam shaft interrupter magnet. Gm has open recall for 2021-2025 engine however 2019 vehicle is still under investigation.

Informant system tells me that the engine oil is low every time right at about 1,000 miles after I change the oil. There have been times where the engine has hesitated to accelerate shortly after receiving the message. I've taken truck to be serviced with no oil leaks found. I purchased this truck with 21,000 miles on it, and it's been doing this ever since I've had it.

The contact owns a 2019 GMC Sierra 1500. The contact stated that while driving at various speeds, the vehicle hesitated and failed to properly accelerate while the accelerator pedal was depressed. No warning light was illuminated. In addition, the contact was aware of excessive oil consumption and the vehicle was previously taken to a local dealer. An appointment with the same local dealer was scheduled to inspect the vehicle. The vehicle was not yet repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 87,000.

The starter started dragging about a year ago and on November 12 the 2019 GMC truck would not start. We had it towed to harper GMC in minden, la. They told us the motor was locked up. This vehicle has a little over 40,000 miles on it. Has always been parked in a carport out of the weather and still looks brand new. I see where 2021 GMC trucks have a recall on the motor and this is the same problem with our 2019.

It is the same issue with 2021-2024 6. 2l engines that have already been recalled. I have to replace lifters and cam because of the issue.