GMC Yukon knocking problems

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 23, 2026 · Engine · MS

crank/rod failure on 6.2 engine. yes it is available same as other people with blown 6.2s yes, GMC dealer diagnosed crank failure no no. engine still runs but is knocking and squealing but dies after a few mins and won't restart till it cools off

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 Oct 20, 2026 · Engine, Transmission · PA

VEHICLE: 2021 GMC Yukon, 5.3L V8 (L84). VIN: [XXX]. Mileage at failure: approximately 88,000. Component: Engine. INCIDENT DATE: XXX While I was driving on a highway, the engine began to misfire and I heard a ticking noise. The check engine light then began flashing, indicating a severe misfire. I pulled off the highway immediately to a rest area. The vehicle was towed to a GMC dealer. The dealer's diagnosis suspected failed valve lifters, and the repair orders call for a misfire diagnosis with the Bank 1 cylinder head removed, and replacement of the camshaft, lifters, and related parts. This failure caused sudden loss of engine performance at highway speed. The engine began smoking. My family and I were in the vehicle, and we were fortunate there was a safe place to stop. I believe this is a known defect. GM Service Bulletin PIP5776, "Misfire Due to Collapsed Lifter," covers 2021 GMC Yukons with the 5.3L L84 engine. It describes a misfire with a bent pushrod leading to a collapsed lifter or a lifter that comes apart, and it attributes the cause to an internal lifter concern. Many other owners of GM V8 trucks and SUVs have reported the same failure, and a class action over the AFM/DFM lifters has been pending against GM in federal court in [XXX] since 2021. I bought this vehicle new and have maintained it. This is the second time this vehicle has left my family stranded on a highway. In 2024, a separate known issue left us, including three children under [XXX], on the side of a major highway about 7 hours from home. GM repaired that issue. For the current failure, GM has not agreed to cover the repair. It has offered $5,951.39 toward an engine replacement, which would leave me responsible for $13,886.59 plus teardown labor. I am filing this complaint so the federal safety agency is aware of this failure, which can cause sudden loss of power on the highway. GM case number: XXX. Dealer: Fred Beans Buick GMC, [XXX]. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Oct 13, 2026 · Engine · NY

In late February / early March 2026, at approximately 139,000 miles, my 2021 GMC Yukon Denali with the 6.2L V8 (L87) engine developed a loud knocking/rattling noise that sounded like a loose part inside the engine. The vehicle kept running, but the noise persisted. I took the vehicle to a GMC dealer. The dealer checked the VIN and told me there was no recall covering my vehicle. The engine was found to have internal damage consistent with connecting rod / bearing failure. A replacement engine was quoted at approximately $8,000. Because I could not afford that, an independent mechanic in Connecticut rebuilt the engine for approximately $5,500 in total (about $4,500 in parts plus $1,000 in labor), paid out of my own pocket. I have all the invoices for the repair. This failure appears to be the same connecting rod and crankshaft bearing defect covered by Recall 25V‑274 for other 2021–2024 vehicles with the 6.2L L87 engine, but my VIN is excluded from that recall according to the dealer and the federal safety agency/GM VIN lookups. No crash and no injuries occurred. I am reporting this failure so it is documented in the federal safety agency's investigation of L87 engines outside the recall population, and I respectfully request a review of why this VIN was excluded and whether reimbursement for the repair is possible if coverage is expanded.

Filed Oct 13, 2026 · Engine · PA

2024 GMC Yukon, L87 6.2L V8 VIN: [XXX] This complaint concerns the L87 6.2L engine and the federal safety agency Engineering Analysis EA26005 regarding engine failure following the remedy for Recall 25V‑274. My vehicle underwent the GM recall inspection, including the Pico test, and passed the inspection. The engine was therefore not replaced. Since completion of that inspection, I have continued to obtain abnormal used-oil-analysis results showing excessive and increasing engine wear metals. At the most recent oil change, I cut open the engine oil filter and found visible metallic swarf/debris embedded in the filter media. I have retained the oil filter media and have photographs documenting the metallic debris. I also have the previous oil-analysis reports documenting the wear-metal trend. The engine has now developed a loud knocking noise. Because of the knocking noise, documented abnormal wear metals, and visible metallic debris in the oil filter, I no longer consider the vehicle safe to operate due to the possibility of sudden engine failure and loss of propulsion. The significant concern is that this vehicle passed GM's Recall 25V‑274 screening procedure but appears to be developing the same type of internal engine deterioration that the recall was intended to identify and prevent. I am requesting that the federal safety agency associate this complaint with Engineering Analysis EA26005 and review this case as a possible post-remedy failure of the Recall 25V‑274 inspection procedure. Supporting evidence available includes: • Used-oil-analysis reports showing excessive and increasing wear metals • Photographs of metallic debris/swarf in the oil filter media • Retained oil filter and filter media • Dealer repair and recall records • Mileage and oil-change records • Current loud engine knocking noise The vehicle is presently not being driven because of the potential for engine seizure or sudden loss of propulsion. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Sep 29, 2026 · Engine · PA

Engine failure at 20,959 miles (GM 6.2L V8). Sudden knocking noise. I heard noise at idle, accelerating, and decelerating. Sounds increased in volume / frequency within a 24hr period and driving it only a few miles. GM dealer verified engine failure and is ordering a replacement under warranty.

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 Sep 17, 2026 · Engine · NC

Heard a ticking sound whenever I was driving down the street then all of the sudden it got louder & SUV suddenly put itself into neutral. I was barely able to pull onto side of road to try and switch gears when hazard lights went on by themselves. Car wouldn’t turn on or start and whenever I tried again the check engine light appeared. Got the SUV towed to local, nearest GMC dealership who just called and said it was the engine failure and needed to be replaced.

Filed Sep 10, 2026 · Engine · 50,000 miles · CO

The contact owns a 2022 GMC Yukon. The contact stated that while driving 65 MPH, the vehicle lost automotive power, with several unknown warning lights illuminated. The vehicle was restarted after several attempts; however, the vehicle failed to accelerate as needed and was towed to the dealer. The vehicle was repaired under the federal safety agency Campaign Number: 25V274000 (ENGINE AND ENGINE COOLING); however, at start-up there was an abnormal ticking sound coming from the engine and the vehicle was taken back to the dealer to be diagnosed. The contact was informed that there were metal shavings inside the oil filter and the engine needed to be replaced. The vehicle was repaired. The manufacturer was notified of the failure. The failure mileage was 50,000.