2019 GMC Yukon Complaints

POWER TRAIN — Filed 01/07/2026

The vehicle experienced a sudden and rapid mechanical failure of the 6-speed automatic transmission (6L80 model) within a span of less than two weeks. The light did not come on until the transmission was past salvage. The failure escalated rapidly from initial minor slipping to a severe loss of vehicle propulsion. A loss of acceleration while driving poses an immediate crash hazard, as the vehicle cannot safely maintain speed with surrounding traffic or accelerate out of dangerous situations. The failure required towing and a complete out-of-pocket replacement of the transmission unit at 116,374 miles to restore safe operation. The manufacturer has failed to issue a safety recall despite widespread failures of this component causing unexpected power loss on public roadways.

POWER TRAIN — Filed 01/05/2026

Transmission is acting funny. Stuck in low gear /not shifting at low speeds. Vibration sometimes at higher speeds when shifting gears. 8 9 10 gears.

POWER TRAIN,ENGINE — Filed 06/20/2026

I was driving home on the interstate from vacation and I was set on cruise control it was 1 am so not a lot of traffic was on the road thank god. It could have been really terrible if lots of traffic was present as the engine just died without notice! The vehicle was decelerating nothing was working I could not speed up. I was able to get over to the side of the road. I got a notification on my phone that said battery critically low start vehicle to charge battery. Well nothing would start at this point. I lot all power seconds later. I thought that the cruise control was locked up and restarting it would reset it. I called roadside assistance to get a jump and that did not work. I got towed into an auto repair shop. They called me and told me that the engine is locked up that they drained the oil and found metal in it and metal pieces in the oil filter as well. They checked for leaks and said there was none that they could find. They said there was a recall but it was for the exact same symptoms that was diagnosed here but only starting with year 2021. Mine is a 2019 Yukon Denali with low mileage so not sure if all the other Yukons were aged out or already past engine death and that’s why they were not part of this but this should be included in with the open recall considering how everything is the same that is effecting this year that I have and they should pay for a new engine! Clearly the v8 6.2 gmc engines are having major issues I’m just glad I wasn’t going that fast and traffic was slow so I was able to get over safely before catastrophic things happened since there was no warning when this all happened!

ENGINE — Filed 08/06/2025

Getting the valve ticking noise.

ENGINE — Filed 03/01/2026

The contact owns a 2019 GMC Yukon. The contact stated that after starting and exiting the vehicle to allow it to warm up, the contact later noticed that the vehicle had turned off. The vehicle was towed to a first mechanic, who was unable to restart the vehicle or determine the cause of the failure. The vehicle was towed to a second mechanic, where it was diagnosed and determined that the engine had failed and needed to be replaced. The vehicle was not repaired due to the cost. The dealer was contacted and provided an estimate for the repair, but the vehicle was not diagnosed or repaired. The contact stated that the dealer's estimate was higher than the mechanic's estimate. The manufacturer was notified of the failure and suggested purchasing a new vehicle. The failure mileage was approximately 170,000.

ENGINE — Filed 03/29/2026

Complete engine failure. The dealership kept the engine. This happened at a low rate of speed but it would have been much worse if on the highway. Yes the engine was completely replaced. The check engine light came on and their was a loud ticking noise coming from the engine.

POWER TRAIN — Filed 01/16/2026

The contact owns a 2019 GMC Yukon. The contact stated that while driving at slow speeds in a parking lot, the transmission unexpectedly downshifted and the vehicle jerked abnormally. The contact stated that when the gear shift lever was shifted to drive(D), the vehicle failed to function as designed. The contact was unable to drive the vehicle, and the vehicle was towed to the residence. No warning light was illuminated. The vehicle was towed to the dealer, where it was diagnosed that metal shavings were found in the oil and the transmission needed to be replaced. The warranty had expired, and the vehicle was not repaired. The contact stated that the failure persisted. The vehicle was then taken to a transmission specialty shop, where it was confirmed that metal shavings were found in the oil and that the transmission was defective and needed to be replaced. The contact took the vehicle back to the private dealer where the vehicle was purchased. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was 125,870.

ENGINE — Filed 08/18/2025

I was driving on RT80 in NJ and my 2019 GMC Yukon lost power. I took it to my local Chevy dealer. The scan code was p0300 engine misfire. They removed right side valve cover and found no bent pushrods. Inspected camshaft and found damage from failed lifter. I had to get a new engine and pay out of pocket $14,435.44

POWER TRAIN,ENGINE — Filed 03/05/2026

2019 GMC Youkon with 94,659 miles. I am the second owner of this vehicle. I purchased it used in February 2025. Check engine light came on in route to work on March 5, 2026. Immediately took vehicle to Auto Zone to scan for codes. Multiple codes were returned. I drove it directly to a repair shop for further diagnostics. Return Results were massive lifter failure and cam shaft damage. Why would the check engine light not come on sooner to prevent TOTAL FAILURE. Vehicle was towed to a GMC certified mechanic where it was confirmed that all Lifters and cam shaft were damaged beyond repair and must all be replaced. Estimated Cost of repairs so far: $8,596.80 Labor: Remove & Replace Left And Right Valve Lifter (Both Sides) Coolant Service Oil Change Labor Parts: Engine Camshaft 1 , Genuine GM Engine Valve Lifter Oil Manifold Gasket 1 , Genuine GM Fuel Pump Gasket 1 Engine Timing Cover Gasket Set 1 Engine Valve Lifter Guide 1 Engine Valve Lifter Guide 1 Coolant/Antifreeze Orange Dex-Cool 1 Gal 3 Engine Push Rod 8 Engine Oil Filter 1 0W-20 Full Syn 8 Engine Cylinder Head Bolt Set 1 Engine Valve Lifter Guide 1 Engine Valve Lifter Guide 1 Stock Engine Valve Lifter 4 Stock Engine Valve Lifter 4 Engine Cylinder Head Gasket Kit 1 Engine Cylinder Head Bolt 10 APPROVED Subtotal $8,422.71 + est. Tax $174.09 $8,596.80 Estimated time for repair: going on three weeks

SERVICE BRAKES,FORWARD COLLISION AVOIDANCE — Filed 02/08/2026

Automatic emergency braking system deployed unexpectedly on acceleration from a traffic light stop. Vehicle was about 10-15 MPH and system operated with no brake pedal input. A vehicle behind had to do a panic stop to avoid collision. Deployment disengaged when accelerator pedal was released. My wife, principal driver, was in the car. She advised this had occurred two times before. No recalls are presently listed for the vehicle.