2026 GMC Yukon: engine knocking or ticking

Filed Nov 6, 2026 · Transmission · VA

Dealer performed oil change on 10/14/26 @ 11521 miles. We stated at time of oil change that we were experiencing shuttering at 1200-1500 rpm' and was hearing knocking sounds from engine. Advisor stated that they will change oil and test drive vehicle and check for codes. It is noted on diagnostic report that oil was changed, test drove vehicle 5 miles and all ok at this time. Vehicle was released back to us to drive without any further investigation to the symptoms that we noticed. Advisor requested that we make an appointment with the transmission division. Appt. made with transmission group for 10/26/26. On 10/25/26 Engine light came on. At the 10/26/26 appt., code P0016 was noted @ 11862 miles and we were called to say that we needed a new engine. Advisor also stated verbally that there were metal shards in the oil. Dealer offered good will assistance and denied the powertrain warranty based on Owner Neglect. Spoke to GM assistance and they are still denying warranty replacement of said engine. General Manager stated that we should request an engine tear down.

Filed Nov 2, 2026 · Engine · NC

Has 3600 miles and engine suddenly lost power and had back knocking/squealing noise and check engine light started flashing.

Filed Oct 21, 2026 · Body, Electrical · MI

My 2026 GMC Yukon Denali Ultimate has had the vadar chrome peel in the first 7000 miles. After that a wiring pinch made the 4 wheel drive unusable during the winter months that I needed it to get into my driveway During summer months the infotainment center completely failed to a black screen and since does not function having the dealership tell me that it will need to be replaced. The 6.2 motor started ticking at 25000 miles, I took it to the dealership yesterday 10/14, the dealership is keeping the vehicle for an estimated 6 weeks to tear the motor apart. The motor is making the noise where it is reported to shut down at high speeds had I not got it in when I did. The vehicle has had no warning to indicate problems.

Filed Sep 29, 2026 · Engine · FL

Engine failed . Stalled in the middle of the road . Engine ran bad . Shaking knocking and trebling. No engine lights on .

Filed Jun 1, 2026 · Engine · NC

So the ultimate failure is from a catastrophically failed crankshaft journal thrust bearing. Which could be caused from one of two things: 1) The crankshaft thrust bearings they are putting in these motors are made with inferior materials, probably cheap Chinese crap or 2) The crankshaft end play tolerance was never set properly, giving the crankshaft the ability to move forward and backward in the engine more than it was designed to. Which will over time beat up on the thrust bearing until it fails. In either case it would result in the same progressive issue showing itself. It will start as a squeak here and there. Which, as the soft thrust bearing material is unable to hold the proper oil film thickness for lubrication, will spiral into more and more heat being sent into the adjacent components, plus the buildup of metal particles being sent through the entire engine oiling system. Which will then start killing connecting rod and crankshaft bearings one by one. If the engine survived to this point, it’s now a ticking time bomb. It is either going to just seize up and not run anymore or the exciting route would be a connecting rod breaks and makes a window sized hole in the side of the engine block.

Filed Apr 5, 2026 · Engine, Transmission · TX

Nothing has happened yet. However, after only 308 miles… my 2026 Denali is knocking and ticking very loud. Why? How is this possible? We’ve only had it 2 weeks! I have only driven it 5-6 times in the past 14-15 days, too worried that this might happen. But I was reassured by the dealership it wouldn’t. But here I am now. I am so disappointed. Being a Disabled Vet I thought we could have something that we both liked. Now I am upset because I feel betrayed and lied to. I did a video but it’s too large to upload so I can’t get it under 10MB.

Filed Feb 7, 2026 · Engine, Transmission · AL

Engine failure while driving 75 miles per hour in highway in brand new Yukon Denali. 3,000 miles and got a “decreased acceleration” warning. Then couldn’t accelerate and loud knocking noise from the engine, likely a lifter issue. I will have to get a new engine according to GMC. Unbelievable. Recall was for 2021-2024, but my 2026 is havin the same issue.