*Median odometer reading when the problem happened, where owners gave one. One complaint can name several problem areas.
Engine
While driving at about 35-40 mph, vehicle went into limp mode and then stalled. Vehicle would not restart until hours later after being towed. When vehicle started there is the sound of a rod(s) knocking in the engine.
Oct 5, 2026Suspension
The contact owns a 2016 GMC Yukon XL. The contact stated that while driving 30 MPH, the steering wheel locked up. Several unknown warning lights were illuminated. The contact associated the failure with NHTSA Campaign Number: 16V256000 (Suspension); however, the VIN was not included in the recall. The dealer was contacted. The manufacturer was contacted by phone and was made aware of the failure but stated that the VIN was not included in the recall. The failure mileage was approximately 108,346.
Dec 4, 2025 · 108,346 milesPower train
1. My vehicle is having transmission issues with shuddering and shifting. M5U RPO code 8L90 transmission. 2. My safety and the safety of others is a concern if the transmission is not working as intended my vehicle could be at risk an accident that could be avoided. 3. The problem has not be reproduced or confirmed by a dealer I work on my own vehicles and I am going to repair this issue myself if able. 4. There are no trouble codes on my vehicle when scanned with an OBD2 scanner.
Aug 15, 2026Chest clip, buckle, harness
After my child had thrown up all over the car seat her father had taken her inside to clean up and I took the car seat apart to throw the pieces into the washer to clean them. The harness strap did not come out fully clean so I contacted Graco for a replacement piece and I was told that they donât replace those and that the strap being removed totaled my car seat. It has a woven material tab that goes up through the hard plastic base and locks in by opening itself. Itâs essentially a T in the material so it can be folded to go back through the hard plastic base. I was told that since the manual doesnât provide instructions regarding that piece that I should know itâs not to be…
Jun 1, 2026EngineCrash
My wife was driving down the highway and out of no where there was a loud taping sound, the vehicle started running real bad (skipping), the vehicle lost power and she lost control of the steering. As a result, she ran off the road into a ditch. this is a known concern with the 6.2 liter engines and all signs are pointing to lifter failure. She could have ben seriously injured and GM is responsible for this.
Apr 21, 2026Power train
TRANSMISSION FAILURE ON 8L90 8 SPEED TRANSMISSION. 93,000 MILES.
Apr 1, 2026Engine
I am submitting this complaint to report what I believe to be a serious and systemic safety defect involving GM 6.2L engines equipped with fuel efficiency systems such as Active Fuel Management (AFM) or Dynamic Fuel Management (DFM). I have experienced catastrophic engine failure in two separate GMC Yukon Denali vehicles with nearly identical symptoms, which strongly suggests a broader design defect rather than isolated mechanical issues. My first vehicle, a 2015 GMC Yukon Denali XL, developed significant engine performance problems consistent with known lifter and camshaft failures widely reported in GM vehicles using these fuel efficiency systems. Due to ongoing reliability concerns and…
Feb 28, 2026Engine
AFM system failed resulting in engine replacement.
Nov 10, 2025
Owner complaints are submitted to NHTSA by the public and are not verified. Shown as filed (NHTSA removes personal details); long reports are shortened.