GMC Yukon Complaints

6,462 consumer complaints on file.

#11657726April 30, 2025
ENGINE, POWER TRAIN, FUEL/PROPULSION SYSTEM
My engine failed while I was driving & I had no warning. It was very scary & dangerous. Luckily I was in an area where I could get off the road quickly. It started skipping then lost power. I basically coasted off the road & had to call for help. It was making a bad knocking noise. This happened 2 weeks ago on April 16. It has been sitting at Glynn Smith.GMC dealership since. I was told by the service manager that the engine failed & I will need a new engine. the engines are on back order now. I fear they will replace it with the same problem. I see the recall this week but will changing the oil viscosity really fix it?? Doubtful. Someone is going to get killed or hurt from this problem. I do not want the same issue to happen with a new engine.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11657648April 29, 2025
ENGINE, POWER TRAIN
2 months ago our 16 gmc Yukon Denali 6.2 bent a push rod on cylinder 4 . So had to fix it when I took out DOD lifters put them on work bench and about 10 minutes out the DOD lifters flew apart and know having transmission issues it’s starting to shudder ! So I would liked the [XXX] thing recalled because engine still isn’t right either it only has 130000 miles. I’ll never buy a [XXX] gmc because of problems! I want the [XXX] thing fixed ASAP we paid to much money for it to be having problems!!!! Please send a recall letter to fix it ! [XXX] . 4/29/2025 6:53 p:m INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11657669April 29, 2025
ENGINE AND ENGINE COOLING:EXHAUST SYSTEM
I purchased a MagnaFlow aftermarket catalytic converter system for my 2008 GMC Yukon SLT 5.3L through Walmart’s online marketplace, sold by a third-party vendor called OurDealsRock. The product was advertised as “50-state legal” and compatible with vehicles registered in New York State. However, shortly after installation, my check engine light turned on, and diagnostic codes P0420 and P0430 (Catalyst System Efficiency Below Threshold) appeared. Initially, I thought this was a minor sensor issue, but over time, the vehicle’s performance gradually deteriorated. I noticed reduced acceleration, poor fuel economy, and eventually significant loss of power. The vehicle began shaking under load, misfiring, and overheating. These symptoms worsened steadily—not immediately—but progressively after continued driving with the aftermarket converter installed. I had the vehicle inspected by a certified mechanic, who confirmed that the MagnaFlow converter was not CARB-compliant, was not approved for use in New York, and that it had been illegally marketed as such. He also informed me that prolonged use of a non-compliant, malfunctioning converter caused excessive backpressure, leading to complete engine failure over time. The diagnosis was confirmed by a second mechanic before I committed to the engine replacement. The product was later removed from Walmart’s site, becoming unavailable for sale in my zip code [XXX] ) shortly after my initial complaint. This shows clear acknowledgment that it should never have been sold to a New York consumer in the first place. But by the time it was taken down, the damage had already been done. Component/system that failed: •MagnaFlow aftermarket catalytic converter system •Ultimately caused failure of the vehicle’s engine block Safety concerns: •My family and I were unknowingly driving with a damaged and failing engine •The vehicle’s degraded performance, overheating, and power loss could have compromised our safety during highway d INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORM
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11657665April 29, 2025
POWER TRAIN
I have had major transmission failure in my 2021 GMC Yukon Denali (6.2L V8, 10-speed automatic). The vehicle has approximately 72,000 miles. Recently, a critical internal clip/retainer in the transmission broke loose, sending metal debris throughout the transmission. This catastrophic failure has rendered the vehicle undrivable and requires a complete transmission replacement. Unfortunately, the vehicle is just outside the powertrain warranty, yet I firmly believe this failure is due to a manufacturing/design defect – not normal wear and tear. I purchased this Yukon Denali as a premium, flagship SUV and have maintained it carefully. I expected the transmission to last well beyond 72k miles under normal use. It is disappointing and that a core component failed so early. Not only has this imposed a significant financial burden, but it also undermines my confidence in the vehicle’s safety and reliability for my family. A modern transmission should not self-destruct at this mileage, especially given GM’s reputation and the Denali’s top-of-the-line status. Importantly, I have discovered multiple known issues and GM bulletins related to the 10-speed automatic transmission used in my Yukon. For example, GM issued a major recall in late 2024 (NHTSA Campaign 24V797000, GM recall #N242454440) affecting 2021 Yukon models (among others) due to a defective transmission control valve that could fail and cause the rear wheels to lock up, this demonstrates that GM has acknowledged serious problems in the 10L80/MQC 10-speed transmission design. Additionally, a recent GM service bulletin (PIP6008C, Jan 24 2025) indicates that internal transmission retaining rings can dislodge, causing the internal gears to separate – which leads to loss of reverse and internal damage. This scenario is similar to what happened in my transmission. My family was left stranded away from home with no warning. The vehicle just stopped working. The warning lamp did not come on until diagnostics was run.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11657652April 29, 2025
ENGINE
Driving down highway. Engine failure, loss of power. Ended up being lifter and camshaft failure.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11657461April 29, 2025
POWER TRAIN
The contact owns a 2023 GMC Yukon. The contact stated that the vehicle failed to reverse as needed. The contact stated that the transmission was stuck in neutral. The contact stated that while driving 35 MPH, the transmission was slipping. There were no warning lights illuminated. The vehicle was towed to the local dealer, where it was diagnosed and determined that the valve body needed to be replaced. The dealer informed the contact that parts were on backorder. The vehicle was not repaired. The manufacturer was contacted, and a claim was filed. The failure mileage was approximately 72,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11657191April 28, 2025
ENGINE
The contact owns a 2019 GMC Yukon. The contact stated that after starting the vehicle, her husband noticed an abnormal tapping sound coming from the vehicle. The vehicle was taken to a local dealer, who determined that the drive belt needed to be replaced. The vehicle was repaired, but the failure recurred. The vehicle was taken to another local dealer, Gerry Lane Buick GMC (6615 Florida Blvd., Baton Rouge, LA 70806) to be diagnosed and it was determined that the lifters had failed. The vehicle was repaired. The manufacturer was contacted and provided a partial reimbursement for the repair. The failure mileage was approximately 73,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11657331April 28, 2025
ENGINE, POWER TRAIN
On March 28, my 2023 Yukon Denali stalled on a 4 lane road forcing me to make an emergency stop on the side of the road in a right hand turn lane. The vehicle required towing to a local GMC dealership. They could not restart the vehicle and upon evaluation found metal shavings in the oil. They have recommended an engine replacement. There was no warning, it just stalled and would not restart. My Yukon remains at the dealership and we are still waiting for an engine.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11657268April 28, 2025
ENGINE
Driving approx 60mph on expressway and engine stuttered for 3-4 seconds, check engine light came on and vehicle completely shut down. Wouldn't restart. Family with kids had to cross 4 lanes of traffic to make it to the shoulder of an on-ramp. Towed to dealership and they stated the motor seized and needs a complete replacement. Vehicle has 72,000 miles on it, always stored in a temperature controlled attached garage, oil changes before schedule at the local dealership.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11657167April 28, 2025
STEERING, AIR BAGS
The contact owned a 2021 GMC Denali. The contact stated that while his wife was driving at 25 MPH, the vehicle lost power steering. The vehicle failed to turn and crashed into a tree. There were no reported injuries. There were no warning lights. The contact stated that the failure was related to NHTSA Campaign Number: 21V455000 (Steering). The vehicle was taken to his residence. There was no police report filed, airbag deployment, or fire. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The insurance company deemed the vehicle to be a total loss. The manufacturer was contacted, but no assistance was provided. The failure mileage was approximately 67,000.
Crash:
Yes
Fire:
No
Injuries:
0
Deaths:
0
#11657130April 28, 2025
POWER TRAIN, ENGINE
The engine needs replaced and GM doesn't have any engines or know when we will get any engines. Evidently this affects numerous 6.2 liter engines that GM made from 2021-2024.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11656963April 26, 2025
ENGINE
Engine, just froze while driving.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11656753April 25, 2025
ENGINE
The contact owns a 2019 GMC Yukon. The contact stated while driving at an undisclosed speed, there was an abnormal rattling sound coming from the engine compartment, prompting the contact to discontinue driving the vehicle. The check engine warning light was illuminated. The vehicle was taken to the dealer, who diagnosed a failure with the cam shaft. The vehicle was repaired. The manufacturer was notified of the failure, a case was opened, and the contact was referred to the NHTSA Hotline for assistance. The failure mileage was 170,000. The VIN was not available.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11656907April 25, 2025
ENGINE
Crank shaft has failed.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11656866April 25, 2025
ENGINE
I was driving my Yukon with my family back from a trip and my Yukon engine shut off while on the highway. The vehicle went into neutral but I was driving down a hill when is all happened. Luckily there wasn’t much traffic and I was able to pull of to the side of the road. There was no check engine light or indication of any issues prior to this incident happening. After this incident, the vehicle turned back on and was able to drive home. Now it is seating at a dealership waiting for a new engine with no eta on a new engine.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11656624April 24, 2025
ENGINE
Was driving home at highway speeds and my 2019 yukon denalis engine just shut off in traffic and had to come to a stop in the middle of traffic and it wouldn't restart, had to have it towed to dealer and they told me the engine was siezed.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11656535April 24, 2025
POWER TRAIN
Driving on the highway the engine suddenly revved high and suddenly went into limp mode on the highway. Reverse is no longer operational. 2022 GMC Yukon with 49,000 miles. Limped the vehicle to the dealership who has indicated it needs a new transmission valve body that is currently on national backorder given the prevalence of the issue. I have been requesting a work order denoting the failure and required repair but have not yet received from my dealership. I will pass this along as soon as I receive it. I spoke with GM customer service last night requesting their assistance in getting this for me.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11656273April 23, 2025
POWER TRAIN, ENGINE
The contact owns a 2016 GMC Yukon. The contact stated that while driving at an undisclosed speed, the vehicle unexpectedly downshifted with the check engine warning light illuminated. The vehicle was taken to the dealer, where it was diagnosed that the transmission had failed and needed to be replaced. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 250,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11656433April 23, 2025
ENGINE
2022 GMC Yukon Denali, 6.2 with 37,000. Bearings failed. Needs a new motor. 150 miles away from home. Engine failed with no warning on a highway. Had to call police to assist. Paid for a tow truck out of pocket. Covered Under powertrain warranty, Unsure if I will get a new or refurbished motor. I was told by the dealership that lead times could exceed two months. GM is not extending my powertrain warranty.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11656077April 22, 2025
ENGINE
While approaching a red light, my 2022 GMC yukon just shut off leaving us unable to start it or even shift it to neutral to move the vehicle. This posed danger with oncoming traffic, so my family and I got out of the vehicle while awaiting a tow. We had to get the car towed and it was determined to have complete engine failure due to a rod bearing issue. One hour prior to it failing we had a check engine light come on. No other noises or warnings prior. The car is now at the dealership awaiting a new motor since still being under warranty. The motors are on backorder so its unclear how long this will take.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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