general problems of the 2015 GMC Sierra 1500 - part 1

Lifter and camshaft failed.

I have owned 4 of these trucks in my lifetime ranging from 2007-2015 all equipped with the same drivetrain. 5. 3l engine and 6l80 transmissions. All have had the same failures. The engine afm system particularly the lifters fail which in turn destroys the camshaft and destroys the engine. More importantly the transmission torque converter fails sending debris through the whole system causing a sudden loss of drive. This happened while driving down the road and was a safety concern for myself and others. This time it costed me $6500 to replace the transmission. All of the trucks I have owned experianced the same failures how is this not a problem?.

The GMC Sierra 1500 started a knocking sound. The collapsed lifter on a afm cylinder bent a push rod which led to cam failure. Metal fragments are throughout the oil system.

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.

The contact owns a 2015 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the vehicle stalled with the check engine warning light illuminated. The vehicle was able to be restarted. The vehicle was taken to an independent mechanic, where it was diagnosed that the engine had failed and needed to be replaced. The vehicle was not repaired. The vehicle was taken to the dealer, where the diagnostic result was confirmed. The contact was informed that the engine needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 97,000.

The contact owns a 2015 GMC Sierra 1500. The contact stated while driving approximately 50 mph, the vehicle started to lose motive power and then stalled. The contact stated that there was a black cloud of smoke coming from the exhaust pipe. The check engine warning light was illuminated. The contact had the vehicle towed to an independent mechanic. The vehicle was diagnosed, and it was determined that the rod bearings had failed and needed to be replaced. The vehicle was not yet repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 122,000.

There is a known defect by other consumers with the same year/make/model as mine that causes the radiator to leak. I replaced the original radiator about a year ago with a new gm radiator (84207654) and it’s now leaking as well.

Lifter failure cylinder 1 at 82458 should be a recall.

The contact owns a 2015 GMC Sierra 1500. The contact stated that while the vehicle was parked and occupied at the residence, the contact exited the vehicle and went inside his home; however, forty minutes later while attempting to start the vehicle, the vehicle failed to respond as needed. The contact stated that a bystander inspected the vehicle and assumed the starter had failed. No warning light was illuminated. The vehicle was towed to dealer where it was diagnosed and determined that the engine needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure and suggested that the contact take the vehicle to the local dealer for assistance. The approximate failure mileage was 141,000.

The motor goes into a v4 to v6 to v8 mode on its own . . In which it makes the lifters & pistons change to cause problems with the motor.

While driving the vehicle at approximately 40mph the motor made a tapping sound, I was able to pull into a parking lot and have the vehicle towed to the dealer. The dealer told me that the vehicle was out of warranty and appeared that under initial inspection the would have to rebuild the motor due to a lifter failure at the estimated cost of $18,000. I had the vehicle towed to a reputable repair shop and after the did a tear down to the small block they determined a bent push rod and broken lifter, all pushrods and afm lifters were replaced at the cost of $10,754. Dollars as invoice shows. The issue occurred again on 10/25/25 causing catastrophic failure that will cost me a complete engine replacement.

Had to have transmission replaced and engine work (lifters and cam) on a gm truck with 100,000 miles on it. Cost $8,000. Was told by both mechanics that they've seen many of this same issue with this same year truck for gm.

Purchased this vehicle on 06/29/2023 from robideaux motors in coeur d alene id. With 81,397 mile on the odometer. On 01/05/2024 the 6. 2l engine with 84,109 miles, started having a ticking sound after starting it at my son's house two miles from home. I called the dealer and was told to bring it in for diagnosis by a tech. While driving the truck to the dealer the ticking got worse and motor started to shudder and the check engine light came on. Cause was a misfire on cylinder 4 due to bent push rod and failed lifter. Replaced lifter bank 2 with new push rod. Total cost was $2,852. 74 (have invoice). After many calls and letters to my extended warranty company, they finally paid $1688. 54 of the total cost. On 08/29/2024 the same ticking sound started again as well as the shudder and check engine light. I had it towed back to robideaux motors and was told it was a misfire on cylinder 6 due to lifter failure. Robideaux motors did repair under their repair warranty. I know that this vehicle is not included in class action suit, due to the year. I feel this to be a continuing problem with the gm 6. 2 and 5. 3l motors encompassing many model years. Just wanted to document that the number of years covered in the law suit should be expanded.

I would like to bring to your attention an alarming incident that occurred on January 3, 2024, with my truck. While accelerating onto the highway, the engine and drivetrain failed suddenly, posing a significant safety risk. The failure left the engine incapable of functioning properly, which could have resulted in a catastrophic accident. Seeking answers about the cause of this dangerous malfunction, I promptly arranged for an inspection by rnz concepts. After evaluation, they suspected a potential problem with the hydraulic lifter or camshaft. It is baffling to note that, other than an initial transmission replacement, there were no further indications of any underlying issues, as the truck is regularly serviced. Additionally, within 60 days of purchasing the vehicle, similar issues arose, requiring additional repairs that were paid out-of-pocket at the time. Now, the vehicle is once again out of commission due to persistent GMC failures. The estimated repair cost is expected to be between $6,000 and $10,000.

In the fall of 2023 my 6. 2l v8 with only 107,565 well maintained miles completely seized up and shut off without any warning lights or other indications of failure. I was going up a steep hill and luckily I was able to get to the side of the road by coasting backwards to a stop and fortunately no one else behind me at the time. I did not get my truck back until late spring of 2024. I paid over $13k out of pocket to replace the engine because of this issue that is known to many other gm truck owners. Prior to catastrophic engine failure I’ve had multiple services including replacement of torque converters which would cause the truck to shake violently when shifting along with violent shifts in the 8 speed transmission and at times the feeling of being rear ended when slowing down or coming to a stop which gm claims to be “normal operation”. The engine failure was never investigated by any other parties but was looked at by the dealership service department. Both violent shifts and torque converter shutter were also confirmed by the dealer but only fixed with what I consider to be temporary remedies.

Motor blew up while driving down the road. Had to replace motor on 08/23/2023 at about 116,000 miles. Left me and my family stranded in the middle of no where. Was going around 60 miles an hour and when passing someone got up to 71 mph and then motor blown push rod bent. Transmission issues. Hesitation when switching from park to drive/ reverse. Takes at least 40 seconds and when you accelerate it will jerk so hard. Will lunge forward very sudden and sometimes even when coming to a stop at a stop sign. This happens almost every day.

Truck loses power engine dies while driving after turning at slow speeds. Engine will restart after a few minutes like it never happened does not show any dtc codes or check engine lights. It is intermittent with no advance notice very dangerous to drive. Seems to be a common problem for all gm trucks and suvs from 2014 - 2017.

The body has rust coming through on the lower body panels by the rear doors of a crew cab. Have to replace the ac condenser on a 2015 GMC denali. Looks like GMC already knows there is an issues with this, but no recall on the 6. 2l sierra denalis.

2015 GMC sierra crew 4x4 with 92k miles suffered from lifter and push rod malfunction on cylinder 7. The engine started making a knocking noise, there was a loss of power and the truck was shaking. It seems this a common theme with these trucks.

When decelerating and turning left the car goes completely dead. First time I just about got killed on the highway. The other two times I knew to put it in neutral & crank the car. No steering no nothing. Days Chevrolet in jasper, gais trying to tell me there is no recall on my serial number. I see there were a lot of them years ago. In addition to that my power steering occasionally goes out. The last time I was backing into my garage when I had to manually turn it. Hard to do for a woman.

1. Truck is equipped with afm (auto fuel management) I found out thru some research models since 2014 having collapsed lifters because of this feature. GMC has not made any attempt to recall this problem and let customers face the repair like me at the cost in my case of 7k. This truck has only 58879 miles on it. Not surprising models as new as 2021 had the same issue with no action taken to correct. 2. My truck lost the steering assistant feature putting me in a potential accident while I was driving. Steering the truck is difficult, especially at low speed which I decided not to drive it. I'm 87 years old and I'm facing numerous repairs for a vehicle with only 58k miles on it in order to safety drive my vehicle.

Bad lifters causing hesitation and and hard shifting.

62,000 miles. P0307 error. Replaced spark plugs, coil. Head removal, lifter replaced and now another bad lifter. Faulty active fuel management lifter (afm lifters) that results in the valve train defect. In shop for lifter repairs. (2nd time) cost is $3000. Well maintained truck with all required service completed. Never even towed anything. Vehicle should not have these issues with this low mileage.

The a/c condenser is defective, one of the three welds it has is leaking due to lack of proper welding.

Everything is horrible in the truck.

Na.

Unknown.

At first my brakes began locking up on the vehicle, almost as if they were pumped full and not able to press down any longer, shortly after that the stabilitrack light came on and white smoke began to come out of the exhaust as well as a slight shake in the engine, I immediately turned the vehicle off and parked it, mind you I bought the vehicle 1 day ago and it is already broke down, the issue is with GMC and these sensors they are using they are faulty engine reduces speed and it is not safe to say the least. Not only that but had the exact same problems with my GMC acadia which I finally got the light to stop going off after replacing transmission, brake pedal position censor, as well as gas pedal position censor, also had the throttle body replaced, do you all make products that are worth anything, nothing was ever done about the acadia, the GMC sierra is a 2015 with 70,000 miles on it this car should not be acting like this please contact me at 7195802792 thank you so much for your time, also there are 14 recalls on this year truck yet mine shows that there are 0 recalls to be fixed I am wondering about this as well.

Truck will experience complete electrical failure while driving in motion at various speeds. Failure lasts between 5-10 seconds but causes severe difficulty as steering is affected. A web search reveals grounding issue as potential cause. Manufacturer has not notified me of this particular issue and or any recall effort and I know of no existing recall effort for this issue.

The issues started when I began to notice that I was not having a constant flow of heat coming out of the vents inside of the vehicle. I brought the vehicle over to a local service center and the mechanic there discovered that my antifreeze reservoir was completely empty, but I did not have a leak. After filling the truck back up with coolant, a few days later, while driving, suddenly the truck began to run rough as if the vehicle went into "limp mode". I noticed that the check engine light was flashing and the traction control light was on. At stops, the truck would rough idle, shake, and there was a large amount of smoke coming from the tailpipe. I was able to get the truck back to the same service center that ran some diagnostic tests. He told me that there is a fault in the number 7 cylinder which has no compression in it. I had the truck towed to a local GMC dealership who confirmed that there was no compression in the number 7 cylinder and said that there was a lifter issue in the engine requiring an expensive fix. GMC had the truck from the Friday after thanksgiving (the year 2021) to January 4, 2022, to make the repairs. Repairs were delayed due to the dealership not being able to get the necessary parts in a timely manner.

Incident has happened multiple time. When put on the computer to see if problem, does not show anything. Incident: 1)driving on highway and truck completely loses power and electrical notification come on. Have limited power and electrical notification stayed on continually. Had to take in for repair. This happened may of 2018. 2)while driving on highway, used signal to change lanes and lost engine power. Had some electrical flickers and steering issue. Multiple times in last 6 months, sporadic. 3)when signaling and turning steering wheel, lost engine power. Also had problems with electrical/computer issues. Multiple times in last 6 months, sporadic 4)when slowing down, signaling, and turning steering wheel, after turn completed and start accelerating, transmission seem to be missing. This issue is sporadic and has been doing this since I have had the vehicle new. All these incidents have happened sporadically, with not pre-warning indicators and when having the truck check on the computer, with the exception of (#1) showed no issues.

While operation my 2015 GMC 1500 denali pickup at normal conditions my vehicle produced a engine light. I was three blocks from my office so I proceeded there immediately to have my vehicle scanned for codes. This is where I found out that cylinder #7 had an issue. This cylinder is part of the afm system. I had the vehicle towed to galles Chevrolet for diagnostic services and an estimate for repairs. Up receiving the results (which) I will attach. Bank 1 and possibly bank 2 lifters and springs have failed. Thus possibly cause damage to the cam shaft. While I am aware that my vehicle is out of powertrain warranty (5 years / 100,000 mile), my vehicle only has 52,000 miles on it and very very well taken care of at all times. I am also aware of a class action law suite that pertained to the same exact issue on gm products from 2004-2014. Also service bulletins were produced by gm pertaining to this issue. Now I have been out of service of my vehicle for 3 1/2 weeks not to mention a potential $7000 repair, that should have never been in the picture! poor quality control on products for potential profit gains have cost many many customers pain, anguish, and money.

At times my vehicle will lose power steering,turns off stabilizer traction control light comes on. There is no warning and does this more at low speed turning. You can't turn the steering wheel when this happens and the breaks hardly work. I have 30,000 miles on vehicle I had this vehicle towed to dealership in 2016 they charged me diagnosed but didn't tell me anything more it's only been to the shop for recalls I do my own maintenance.

Improper cooling cycles causing coolant leaks on the radiator.

Power steering goes out and at time turn truck power off whenever I attempt a slow tight turn like backing into my driveway or making tight turns going into parking lots and/or spaces. Most recently, when attempting a u-turn at a busy intersection, power steering went out and engine died. I had to coast to the side to avoid moving traffic. Each time this issue happens I hear 3 dings all my dash & screen lights flash off then on with clicking noises. Dash info changes from speedometer to radio setting. If I look at screen quickly enough when this happens I would sometimes read “rear parking assist unavailable” or something like that. If air conditioning is on it would turn off then on. Doors will unlock then lock, all this happening simaltaneously while attempting to make a turn.