2014 GMC SIERRA 1500

6.2L Engine has well documneted problem with the valvetrane, I have had to fix it 2 times in 3 months. I have pictures and documents from servicing dealerships. Since my ownership, it has always been dealer-serviced. Unexpected catastrophic engine failure, which happened on a major interstate. GM service technicians know there is a valvetrane issue. This instance, the warning light came on under and overpass, and the truck coasted to a stop just past the end of the on-ramp. A GM (Chevrolet dealership currently has it) and a GMC dealership has serviced it since my ownership.

The contact owns a 2014 GMC Sierra 1500. The contact stated that while driving 30-40 MPH, the vehicle lost motive power, and RPM became raised. There was no warning light illuminated. The vehicle was taken to an independent mechanic, and was diagnosed with lower and upper fuel pump failure. The contact was informed that the lower and upper fuel pumps needed to be replaced. The independent mechanic made the contact aware of TSB Number: 13370A (Fuel Pump). The vehicle was not repaired. The manufacturer was notified of the failure and the TSB; however, the VIN was not included. The manufacturer opened a case. The approximate failure mileage was 105,000.

The contact owns a 2014 GMC Sierra 1500. The contact stated that while at a stop sign, the vehicle stalled. No warning lights were illuminated. The vehicle was towed back to the residence. A dealer was contacted; however, the vehicle was not diagnosed or repaired. The contact researched and became aware of an undisclosed recall; however, the VIN was not under recall. The manufacturer was not notified of the failure. The failure mileage was approximately 81,000.

The vehicle experienced complete lifter failure on cylinder number 4 bending the intake valve push rod thus shutting down the cylinder. The vehicle has 167,000 miles and is well maintained. The vehicle gave no warning signs that there was a problem. Simply driving down the road, normal engine temperature, normal oil pressure, the check engine light comes on at the same time the engine begins to mis-fire. Pulling over to the side of the road, I could hear lifter noise from the right bank of the engine. The dealership (Ocean Crest Chevrolet/GMC Warrenton, Oregon) confirmed the damage. The mechanic and the service manager both state the damage is a direct result of the GM cylinder deactivation system, and every single one they have repaired has been cylinder number 4. They further stated that GM has recommended a lifter change when repairing the damage, in other words, the lifters that were installed when the engine was originally built are defective. This damage occurs on both the 5.3 and the 6.2 with cylinder deactivation, and according to the dealership, it begins with cylinder number 4. This problem has also been responsible for cam damage which results in total engine replacement/rebuild due to metal contaminating the oil.

The contact owns a 2014 GMC Sierra 1500. While the contact's husband was driving at an undisclosed speed, the contact became aware that there was smoke coming from the rear window and the window shattered. The contact stated that the defroster was operating during the failure. The contact stated that the shattered glass had fallen on the contact's minor son, who was seated in the rear seat. The son had not sustained any injuries. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The dealer was made aware of the failure. The contact was informed that the repair was previously performed and covered under the warranty. The contact was informed that the current repair was not covered under warranty. The contact was advised to contact the NHTSA Hotline to report the failure. The manufacturer was not made aware of the failure. The failure mileage was approximately 156,800.

Engine failed December 2024 at 140,274 miles. 2 cylinders failed due to lifter failure and had a total loss of power. Engine was replaced by a local shop.

hard shifting transmission and fluid smells burnt, shifts hard in the lower gears and reverse

hard shifting transmission and fluid smells burnt, shifts hard in the lower gears and reverse

hard shifting transmission and fluid smells burnt, shifts hard in the lower gears and reverse

The contact owns a 2014 GMC Sierra 1500. The contact stated that while driving approximately 45 MPH, the vehicle drove over a slight bump in the road. The contact stated that the vehicle bounced, and then there was an abnormal banging sound coming from the rear of the vehicle. The contact recently had work completed on the exhaust system. The contact took the vehicle back to the independent mechanic who had performed the exhaust repair. The mechanic raised the vehicle on the lift and became aware that the rear passenger’s and driver's side cross members, supports for the shock absorbers, and the rear sub frame had extensive corrosion. The contact was advised by the mechanic that the banging sound was coming from the shock absorbers striking the bed of the truck while driving over the bump in the roadway. The vehicle was not repaired. The manufacturer was not informed of the failure. The failure mileage was 78,569.

The contact owns a 2014 GMC Sierra 1500. The contact stated that while driving approximately 45 MPH, the vehicle drove over a slight bump in the road. The contact stated that the vehicle bounced, and then there was an abnormal banging sound coming from the rear of the vehicle. The contact recently had work completed on the exhaust system. The contact took the vehicle back to the independent mechanic who had performed the exhaust repair. The mechanic raised the vehicle on the lift and became aware that the rear passenger’s and driver's side cross members, supports for the shock absorbers, and the rear sub frame had extensive corrosion. The contact was advised by the mechanic that the banging sound was coming from the shock absorbers striking the bed of the truck while driving over the bump in the roadway. The vehicle was not repaired. The manufacturer was not informed of the failure. The failure mileage was 78,569.

Vehicle stalling at low speeds Oil pressure solenoid stuck fault and P0011 camshaft fault.

The contact owns a 2014 GMC Sierra 1500. The contact stated that while driving approximately 25-30 MPH, the power steering became inoperable. The check engine warning light was illuminated due to the fuel tank cap being missing. The contact stated that the failure was related to NHTSA Campaign Number: 14V246000 (Steering). The vehicle was taken to the local dealer, where it was diagnosed with a short in the steering gear. The vehicle was not repaired. The manufacturer was contacted and confirmed that the VIN was not under recall. The failure mileage was approximately 130,000.

The contact owns a 2014 GMC Sierra 1500. The contact stated that while driving approximately 25-30 MPH, the power steering became inoperable. The check engine warning light was illuminated due to the fuel tank cap being missing. The contact stated that the failure was related to NHTSA Campaign Number: 14V246000 (Steering). The vehicle was taken to the local dealer, where it was diagnosed with a short in the steering gear. The vehicle was not repaired. The manufacturer was contacted and confirmed that the VIN was not under recall. The failure mileage was approximately 130,000.

The vehicle’s frame has severely rusted to the point of structural compromise. My certified mechanic determined on December 10, 2024, that the frame could not pass the state safety inspection due to advanced corrosion. Welding is now required to restore structural integrity. The truck has remained inoperable and sidelined since that date. The frame is available for inspection upon request, and I have photos, repair invoices, and a mechanic’s written evaluation. This same frame was previously reworked by GMC twice: May 7, 2018 – Frame treated for premature rust. November 4, 2019 – Frame recoated after prior treatment failed due to improper descaling. Despite these reworks under GMC direction, the issue has progressed to a dangerous level. The structural integrity of the frame is compromised. A severely rusted frame puts occupants and others on the road at risk in the event of a collision, towing, or even regular driving. A weakened frame could lead to loss of vehicle control, failure to protect occupants in a crash, or catastrophic breakage of suspension or driveline components while in motion. Yes. The problem has been confirmed by an independent certified mechanic, who inspected the frame and advised that the rust is beyond surface level and requires welding to repair. They refused to weld during winter due to safety concerns and advised that the truck could not be driven or pass inspection in its current state. The vehicle was previously serviced under GMC’s direction in 2018 and 2019 by a GMC dealer (Weird GMC) to address early frame corrosion. However, the current failure has not yet been inspected by GMC directly since becoming undriveable in late 2024. I have reached out to GMC Customer Assistance and am awaiting a response. There were no dashboard warning lights or alerts for this issue. The only indications were visible signs of rust, which rapidly worsened after the 2019 rework. My mechanic noted signs of significant corrosion during routine servicing

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.

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.

The contact owns a 2014 GMC Sierra 1500. The contact stated that the headlights were dim, reducing the contact's ability to see the roadway while driving. The dealer was notified of the failure and provided an estimate for the headlights' replacement. Additionally, the contact stated that the vehicle was experiencing excessive oil consumption, and there was smoke coming out of the exhaust pipes intermittently. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 370,000.

Unknown. Battery goes into protection mode.

The contact owns a 2014 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the brake pedal was depressed; however, the vehicle failed to stop as intended. No warning lights were illuminated. The contact stated that the brake pedal was depressed to the floorboard. The failure also persisted while driving downhill. The vehicle was taken to an independent mechanic. The contact was provided information for NHTSA Campaign Number: 19V645000 (SERVICE BRAKES, HYDRAULIC). The vehicle was taken to the dealer; however, the vehicle was not diagnosed or repaired. The contact was informed that the manufacturer had closed the warranty, because the vehicle exceeded 100,000 miles. The manufacturer was not made aware of the failure. The failure mileage was approximately 156,000.

The contact owns a 2014 GMC Sierra 1500. The contact stated that while driving at various speeds, the vehicle was veering to the right or to the left and was moving upwards and downwards. Additionally, the contact stated that the vehicle was veering excessively to the left or to the right while turning. The vehicle was taken to an independent mechanic, where the front brakes were replaced, and the contact was informed that the sway bar end links were fractured due to rust. The contact stated that upon inspecting underneath the vehicle, the lower parts of the links had detached, and one of the links was flapping. The contact purchased new parts from the dealer, and the mechanic replaced the links. Additionally, the contact stated that the vehicle was experiencing hard shifts while driving from a complete stop and while coming to a stop. The vehicle was repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 67,000.

The contact owns a 2014 GMC Sierra 1500. The contact stated that while driving at various speeds, the vehicle was veering to the right or to the left and was moving upwards and downwards. Additionally, the contact stated that the vehicle was veering excessively to the left or to the right while turning. The vehicle was taken to an independent mechanic, where the front brakes were replaced, and the contact was informed that the sway bar end links were fractured due to rust. The contact stated that upon inspecting underneath the vehicle, the lower parts of the links had detached, and one of the links was flapping. The contact purchased new parts from the dealer, and the mechanic replaced the links. Additionally, the contact stated that the vehicle was experiencing hard shifts while driving from a complete stop and while coming to a stop. The vehicle was repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 67,000.

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 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 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

Pressing the brakes more than once locks the brakes up multiple times this has happened. Not an isolated event

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

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

Catastrophic transmission failure. Original transmission failed at 113,00 miles. I replaced it at the dealership with a factory rebuilt transmission and that transmission failed after only 40,000 miles. Now the vehicle is back in the dealership shop and they want me to replace the transmission a third time. This transmission is the 6L80 which is prone to fail, the torque converter fails and the transmission locks up I contacted General Motors and filed a complaint with them and they said they would not take any action or assist me with the repair.

Within the first week of buying my 2014 GMC 1500 SIERRA, the transmission fluid was black in griddy. I have had it flushed, then filter changed and new fluid put in within 2 week time frame. A week later had to put a new transmission in it. It barely would drive. So a purchase at 2,999 then to a transmission 4,800 and new control arm with ball joint with new axels. They were busted. Another 2,000. Its sicking. Advice

Within the first week of buying my 2014 GMC 1500 SIERRA, the transmission fluid was black in griddy. I have had it flushed, then filter changed and new fluid put in within 2 week time frame. A week later had to put a new transmission in it. It barely would drive. So a purchase at 2,999 then to a transmission 4,800 and new control arm with ball joint with new axels. They were busted. Another 2,000. Its sicking. Advice

Vehicle engine sputters/stalls. I see there is a fuel pump recall on SOME 2014 GMC Sierra’s but mine is not on the list per your website.

During a turn in the parking lot my vehicle would not allow me to turn something with traction control came up on the screen. The past few days the car got stuck at 0 rpms while driving and did not feel I had adequate power and other times has stalled.

During a turn in the parking lot my vehicle would not allow me to turn something with traction control came up on the screen. The past few days the car got stuck at 0 rpms while driving and did not feel I had adequate power and other times has stalled.

During a turn in the parking lot my vehicle would not allow me to turn something with traction control came up on the screen. The past few days the car got stuck at 0 rpms while driving and did not feel I had adequate power and other times has stalled.

The contact owns a 2014 GMC Sierra 1500. The contact stated that while her husband was driving at various speeds, the front headlights failed to function as intended. The contact stated that the headlights were dim and foggy. The failure limited the driver's visibility, preventing the driver from safely operating the vehicle. There were no warning lights illuminated. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The failure recurred, and the contact was no longer driving the vehicle at night due to the safety concern. The failure mileage was unknown.

The brakes on my GMC Sierra 1500 lose braking power when operating at slow speeds. The brake pedal will lose braking power, causing the vehicle to not stop at slow speeds. This is particularly troubling when pulling into and out of parking spots, driveways, crosswalks, and other areas. I use my truck to pull a boat and when I back my boat into the water at a boat launch, the brakes will lose power when I am in reverse causing the truck to slid into the water.

I am experiencing an issue with a hard brake pedal on my 2014 GMC Sierra 1500. This same issue was previously addressed through a recall and special coverage program by GM, which I had performed. However, the hard brake pedal condition has returned, significantly impairing stopping power at low speeds. This poses a serious safety risk, especially when towing or parking. I can no longer park my trailer safely. The vehicle is difficult to stop, and braking distance has increased substantially. This is a known issue with this model and year. It appears the prior recall may not have adequately resolved the root cause. I am requesting that NHTSA investigate whether additional action or recall extensions are warranted.

The contact owns a 2014 GMC Sierra 1500. The contact stated while driving at an undisclosed speed and attempting to turn the steering wheel, the vehicle lost power steering functionality. The contact stated that the failure had recurred intermittently and had progressively worsened. A message advising of a power steering failure and to drive safely was displayed. The vehicle was not diagnosed or repaired by an independent mechanic or the dealer. The manufacturer was not made aware of the failure. The failure mileage was approximately 150,000.

The contact owns a 2014 GMC Sierra 1500. The contact stated that while driving on several occasions at speeds of approximately 35 MPH, the transmission shifted abnormally, and the vehicle started vibrating. Additionally, the contact stated that while driving at speeds of 65 MPH and higher, the failure worsened. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure. The failure mileage was approximately 146,000.

The contact owns a 2014 GMC Sierra 1500. The contact stated that while driving on the highway at 55 MPH, the vehicle lost automotive power and the steering wheel became stiff. The contact stated that the vehicle decelerated to 20 MPH, with several unknown warning lights were illuminated. The vehicle was taken to an independent mechanic where it was diagnosed, and the contact was informed that the engine had failed and needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The approximate failure mileage was 101,000.

The engine has 160,000 miles and just driving the camshaft and the lifters went out during normal driving. It showed no problems before hand. I’ve heard from multiple people that this is a big issue with the 6.2l gmc Sierra engines. The mechanic also stated it’s there biggest problem. The repair cost are $4,000 - $6000 dollars and the have to pull the whole engine and just fixing those two things. The cost of an engine is $7000 for a used with 100,000 miles and to me it would just happen again in around 60,000 miles or less. For a new engine non oem so an off brand it would cost $8,00 - $10,000 just for the engine. Almost as much as the truck cost not including the labor. This is completely unacceptable cost for repair for a common problem with this truck.

Transmission shutter, not shifting correctly. Had to replace transmission

The contact owns a 2014 GMC Sierra 1500. The contact stated while driving 60 MPH, the check engine warning light illuminated. There was an abnormal knocking sound coming from the engine. The contact determined that the engine had seized. The contact stated that the failure was related to NHTSA Campaign Number 25V274000 (Engine and Engine Cooling). The vehicle was towed to the local dealer, where it was diagnosed and determined that the failure was due to the lifters, and there was low compression in the engine. The vehicle was not repaired. The vehicle was towed to an independent mechanic. The manufacturer was not contacted. The failure mileage was approximately 100,000.

The contact owns a 2014 GMC Sierra 1500. The contact stated while driving 60 MPH, the check engine warning light illuminated. There was an abnormal knocking sound coming from the engine. The contact determined that the engine had seized. The contact stated that the failure was related to NHTSA Campaign Number 25V274000 (Engine and Engine Cooling). The vehicle was towed to the local dealer, where it was diagnosed and determined that the failure was due to the lifters, and there was low compression in the engine. The vehicle was not repaired. The vehicle was towed to an independent mechanic. The manufacturer was not contacted. The failure mileage was approximately 100,000.

I am the original owner of a 2014 GMC Sierra 1500 (VIN: [XXX] ) and began experiencing serious mechanical and electrical issues while the vehicle was still under warranty around 40,000 miles. These included engine RPM fluctuations at idle, vibrations under acceleration above 65 MPH, and intermittent misfiring — all symptoms that are now believed to be early indicators of defective lifters or valve train components. I also experienced repeated electrical failures including a rear turn signal malfunction due to melting/corroded taillight sockets, a thumping rear-end noise, differential knocking, and body panel issues (hood lifting at highway speeds). These were reported multiple times to authorized GMC dealers (Mike Haggerty GMC and Rizza GMC), but I was told there was no issue or no repairs were made. GM refused to assist when I escalated the issue in 2017 via a detailed email, despite all problems occurring within the warranty period. I’m now dealing with a persistent ticking sound from the engine and loss of power, which matches widespread reports of lifter failure in GM’s 5.3L/6.2L V8 engines. These failures pose both a mechanical and safety risk due to stalling, misfiring, and potential electrical fires (in my case, from a failed taillight socket). A class action lawsuit ([XXX], et al. v. General Motors LLC) has been filed regarding these known defects, yet GM has not issued a recall. I’m filing this complaint to add my case to the record and urge NHTSA to investigate these issues. I have full documentation of the original complaint and am willing to provide it upon request. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

I am the original owner of a 2014 GMC Sierra 1500 (VIN: [XXX] ) and began experiencing serious mechanical and electrical issues while the vehicle was still under warranty around 40,000 miles. These included engine RPM fluctuations at idle, vibrations under acceleration above 65 MPH, and intermittent misfiring — all symptoms that are now believed to be early indicators of defective lifters or valve train components. I also experienced repeated electrical failures including a rear turn signal malfunction due to melting/corroded taillight sockets, a thumping rear-end noise, differential knocking, and body panel issues (hood lifting at highway speeds). These were reported multiple times to authorized GMC dealers (Mike Haggerty GMC and Rizza GMC), but I was told there was no issue or no repairs were made. GM refused to assist when I escalated the issue in 2017 via a detailed email, despite all problems occurring within the warranty period. I’m now dealing with a persistent ticking sound from the engine and loss of power, which matches widespread reports of lifter failure in GM’s 5.3L/6.2L V8 engines. These failures pose both a mechanical and safety risk due to stalling, misfiring, and potential electrical fires (in my case, from a failed taillight socket). A class action lawsuit ([XXX], et al. v. General Motors LLC) has been filed regarding these known defects, yet GM has not issued a recall. I’m filing this complaint to add my case to the record and urge NHTSA to investigate these issues. I have full documentation of the original complaint and am willing to provide it upon request. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

I am the original owner of a 2014 GMC Sierra 1500 (VIN: [XXX] ) and began experiencing serious mechanical and electrical issues while the vehicle was still under warranty around 40,000 miles. These included engine RPM fluctuations at idle, vibrations under acceleration above 65 MPH, and intermittent misfiring — all symptoms that are now believed to be early indicators of defective lifters or valve train components. I also experienced repeated electrical failures including a rear turn signal malfunction due to melting/corroded taillight sockets, a thumping rear-end noise, differential knocking, and body panel issues (hood lifting at highway speeds). These were reported multiple times to authorized GMC dealers (Mike Haggerty GMC and Rizza GMC), but I was told there was no issue or no repairs were made. GM refused to assist when I escalated the issue in 2017 via a detailed email, despite all problems occurring within the warranty period. I’m now dealing with a persistent ticking sound from the engine and loss of power, which matches widespread reports of lifter failure in GM’s 5.3L/6.2L V8 engines. These failures pose both a mechanical and safety risk due to stalling, misfiring, and potential electrical fires (in my case, from a failed taillight socket). A class action lawsuit ([XXX], et al. v. General Motors LLC) has been filed regarding these known defects, yet GM has not issued a recall. I’m filing this complaint to add my case to the record and urge NHTSA to investigate these issues. I have full documentation of the original complaint and am willing to provide it upon request. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

I was driving around a lake with my family. We were fishing. I had no warning at all and my transmission started to sputter and jerk extremely bad and my brakes did not work at the same time. I had to use my parking break to stop my family and I from going into the lake at 40mph. I looked up on many websites and forums and saw multiple people with the same issue. I am afraid that this will happen to a young driver and it be very tragic. Please do a recall. My truck is still sitting at my house broken. I am on disability and can not afford to fix it. I just keep paying my payments with no use of my truck. Please I beg of you.