2015 GMC Yukon XL engine problems

Filed Nov 3, 2026 · Engine, Fuel system · WA

Due to GM’s AFM system, cylinder 1 has failed. It is causing degraded driving conditions and it is destroying my exhaust catalyst converter. I have been quoted between $9-18K to get this repaired with the possibility of this issue returning if engine is replaced with the same 6.2L unit. Company is aware of this issue and have instructed repair shops to skip any repair methods of underlying issue and simply replace entire engine.

Filed Jun 4, 2026 · Driver assistance, Engine · 238,000 miles · AR

The contact owns a 2015 GMC Yukon. The contact stated that while driving at 35 MPH to work, the vehicle shifted into neutral and into low and failed to drive at about 20 MPH. The check engine light was flashing. The front collision was unavailable. The contact left the vehicle at a gas station. Upon research, the contact located the federal safety agency Campaign Number: 14V374000 (Power Train), which was similar to the failure. The local dealer was contacted, who confirmed there were no open recalls. The vehicle was not diagnosed or repaired. The manufacturer was contacted via chat, who referred her to the local dealer and manufacturer service center. The contact informed her to confirm the coverage with the dealer. The failure mileage was approximately 283,000.

Filed Mar 23, 2026 · Brakes, Engine · 143,000 miles · IL

The contact owns a 2015 GMC Yukon XL. The contact stated that while driving 70 MPH and exiting the highway, the brake pedal was depressed but the brake pedal was stiff and stuck, requiring that the transmission be shifted to neutral(N), and to stand on the brake pedal with both feet. The contact continuously pumped the brake pedal, but the vehicle slowly responded and almost crashed into other vehicles. There was no warning light illuminated. The contact's wife and daughter were also inside the vehicle during the failure and were frightened and concerned for their safety during the failure. The dealer was contacted and was provided a description of the failure over the phone. The dealer informed the contact that the vacuum pump and an unknown part had possibly failed. The contact was advised that the failure was possibly related to the federal safety agency Campaign Number: 19V645000 (Service Brakes, Hydraulic); however, the VIN was not included in the recall, and there was no warranty coverage on the vehicle for the failure. Additionally, the check engine warning light was illuminated. The vehicle was not diagnosed or repaired due to the cost. The manufacturer was notified of the failure and referred the contact to the federal safety agency Hotline for assistance. The failure mileage was approximately 143,000.

Filed Jan 19, 2026 · Engine · TX

While driving back home from my trip the truck all a sudden made a squealing noise and the engine just stopped. I was on the high way . I was able to coast the vehicle off onto the exit ramp. The vehicle was towed home. The following day it was towed to the repair shop. The shop has confirmed engine failure. Will need to replace the engine . Still waiting for warranty approval.

Filed Dec 9, 2025 · Engine · 100,000 miles · MI

The contact owns a 2015 GMC Yukon XL. The contact stated that when the vehicle was started, the vehicle started shaking with a tapping sound coming from the engine compartment. The contact stated that there were no warning lights illuminated. The contact stated that while driving at an undisclosed speed around the block, the failure persisted. The vehicle was parked at the residence. The vehicle was taken to a dealer, where it was diagnosed and determined that the lifters in the engine were loose, and the lifters and the right side of the engine needed to be replaced. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 100,000.

Filed Jul 8, 2025 · Engine · GA

The Active Fuel Management (AFM) system malfunctioned causing not all engine cylinders to fire at critical times, thus causing a safety issue when the vehicle has insufficient power traveling at highway speed. The AFM is intended to transition from 8 cylinder power to 4 cylinder power to save fuel. However it malfunctioned so that it couldn't transition back from 4 cylinder power. The malfunction occurred while driving at highway speed, approximately 70 mph and towing a trailer. There were no warning messages or other symptoms prior to the failure. This malfunction necessitated removal and replacement of the engine. A certified mechanic completed the repair work.

Filed May 14, 2025 · Engine · 127,000 miles · LA

The contact owns a 2015 GMC Yukon XL. While the contact's wife was driving 50 MPH, the engine seized. There were no warning lights illuminated. The contact stated that the vehicle failed to restart. The vehicle was towed to the dealer where it was diagnosed with engine failure. The contact was informed that the engine needed to be replaced. The vehicle was not repaired. In addition, the contact stated that the vehicle failed to start several times; however, the battery and the alternator were replaced. The contact stated that the vehicle failed to start and was towed to the destination. The manufacturer was not made aware of the failure. The failure mileage was approximately 127,000.

Filed May 5, 2025 · Engine · 112,000 miles · MI

The contact owns a 2015 GMC Yukon. The contact stated that while attempting to accelerate from a stop, the vehicle experienced a loss of automotive power. and no warning lights were illuminated. The contact immediately pulled over, and the vehicle was towed to an independent mechanic to be diagnosed. The contact was informed that the crankshaft was faulty, and that the engine needed to be replaced. The vehicle was not repaired. The contact referenced the federal safety agency Campaign Number: 25V274000 (ENGINE AND ENGINE COOLING) as a possible cause for the failure; however, the VIN was not included. The manufacturer was not notified of the failure. The approximate failure mileage was 112,000.

Filed May 1, 2025 · Engine · SC

While driving my check engine light came on. Engine was shaking and running awful. Smoke was coming from the tailpipe. Mechanic upon inspection informed me that a lifter had failed. Causing damage to the cylinder head. Also causing the fuel injectors to fail. The cylinder head had to be removed and sent to machine shop for repairs. Mechanic informed me that this is a very common failure for LS motors. Repair bill was $5300 for parts and labor.

Filed Apr 30, 2025 · Engine · ID

In December 2024 took my GMC Yukon XL to a mechanic. They replaced the lifter in the driver side of the engine. 2500 miles later it is back in the shop for the same side. Now there is a bent rod. One of the lifter/Rod spots collapsed. The mechanic is in contact with the local GMC dealer to figure out what the next steps are. The recent symptoms had to have car towed back to Fairly reliable Bobs mechanic. Pictures were taken and sent to GMC. First time this happened I heard a Tic in the engine and took it straight to the mechanic. second time this happened. Engine light came on flashing, Trackton light came on, Lost power, there was a shimmy when slowing down and a shake at the stop. I will note the second time this happened below.