GMC Yukon XL check engine light comes on

Filed Nov 7, 2026 · Transmission · NY

My vehicle 2023 gmc yukon xl with 5.3 , I have about 145000 miles on my suv. This vehicle have known defect in valve body and transmission, its same as 2021-2022 models ( GM Special Coverage N242454441 ) gm has acknowledged and doing special coverage for those years , last night I was on highway speed and got harsh shifts and I recieved errors on my screen something saying limp mode , and check engine light , I had to immediately pull over and I scan the code ( I had obd scanner in car ) I got 2 coded p0700 and p0747 , both for transmission and upon checking this is known issue for valve body and transmission, gm dealer has refused a special coverage on my vehicle and said this isn't covered repair , all of the sudden going in limp mode on highway put me and others life in danger I could have been rear ended while moving to pull over.

Filed Nov 4, 2026 · Engine, Fuel system · MI

INCIDENT 4: Fuel Injector Internal Short (Cylinder #6) Component / System Failed: Fuel Injection System / Cylinder #6 Fuel Injector & Wiring Harness Failure Description: Cylinder 6 fuel injector failed due to an internal electrical short circuit, causing immediate engine misfires and severe power reduction. Repair required replacing the Bank 2 fuel rail, four fuel injectors, and the injector wiring harness. Safety Risk: Immediate engine shuddering and abrupt drop in drive power while operating in active traffic creates a serious loss-of-acceleration hazard and heightened risk of a rear-end collision. Dealer / Repair Shop Confirmation: Official diagnosis confirmed by Service Center Technician via electronic diagnostics verifying the internal electrical short circuit. Warning Symptoms: Check Engine Light illuminated simultaneously with engine shaking and sudden power loss; no prior symptoms existed before the failure. Inspection Availability: Confirmed via technician diagnostics; Check Engine light illuminated along with four other warning lights- car had to be towed to dealership to be fixed

Filed Nov 4, 2026 · Engine · TX

While driving the car, I was stopping at a stop light and the engine turned off and stopped moving. The check engine light came on and said low oil pressure, turn car off. Code P0016 was sent to my email stating to get car fixed immediately. I could no longer turn my car on or move it. Car was towed to dealer and they confirmed that engine is locked and will be replaced.

Filed Oct 30, 2026 · Transmission · TX

Check engine light came on and car was shuttering, and locks would lock and unlock. Took it in to dealership, they then said I needed a transmission flush. I did that and paid for it. I experienced the same issue, check engine light again, car turned off while heading out of town, pressed the push start and it turned right back on. Took it to the dealership again and they said wiring harness needed to be replaced did that and paid for it. Issues continued, now the doors are locking and unlocking, I could now not back up, almost as if the back was locked up, gears would not shift. Took it to the dealership again and they now said the transmission needed to be replaced. We did that and paid for it, the issue has resolved, after several trips to the dealership and expenses later. Wanted to have this documented, for any other who may having this issue. Could have been worse had the car not turned back on right away while driving out of town. *CVT Transmission Service: vehicle has a shudder when driving, recommend a transmission flush *Transmission Valve Body: Found fault code P0776 (Transmission Control Solenoid Valve 2 Stuck Off) I do see there is a transmission recall although when I put my VIN it does not indicate the recall for my vehicle

Filed Oct 21, 2026 · Engine, Fuel system · OH

I was driving and the Engine light started blinking. the car started to lose power. i had to pull off the road. the blinking stopped and then i was able to get home. I had it towed to the dealership, where they told me this was a known issue with the AFM valve train system. this is a known issue and I was not made aware of it and continued to drive my car with my children inside of it. had i known, i could have had it assessed for the potential issue. But now, IT IS TOO LATE! I am now being told i need to pay $17,000 to replace my engine. something that could have been avoided if i had known to watch for any issue. but i was never warned. and now i have no car, still have car payment and no help from GM, GMC or anyone else. I know you cannot help me get this fixed, but maybe you can prevent this from happening to someone else.

Filed Oct 21, 2026 · Engine, Steering · KS

2024 GMC Yukon XL Denali with approximately 30,000 miles. The vehicle previously completed the L87 recall remedy (the federal safety agency 25V274000). The dealer inspected the engine, it passed, and the higher-viscosity oil change, filter, oil-fill cap, and owner’s manual insert were performed. Despite that remedy, the vehicle later experienced a sudden loss of propulsion on the highway while traveling with family. The vehicle began shaking and the engine shut down. There were no check-engine lights, warning messages, or other notifications prior to or during the failure. The vehicle was towed to a GM dealer. Diagnostic testing at the dealer confirmed that the engine requires replacement under Special Coverage N252494003. The dealer indicated the replacement engine will be remanufactured. The service department also confirmed that the vehicle had been maintained in excellent condition and that all recommended services were completed as required, so the repair is being covered by GM at no cost to the owner. The prior recall remedy did not prevent a subsequent sudden highway failure with no advance warning. Once the current repair is completed, the vehicle will carry a permanent engine-related entry on its history report at low mileage, which will affect residual value. This complaint is being submitted to document the post-remedy failure involving sudden loss of propulsion on the highway with no warning.

Filed Oct 20, 2026 · Engine, Transmission · AZ

Truck has shuttered, rough idle since May 2026 after purchased new March 2026. We have been to two different GMC dealers who cannot duplicate the problem. Last week the truck started to shutter regularly after highway travel. When coming to a stop in traffic, the truck shutters to kill, loses power, RPMs drop below 500 and then recovers to a rough idle. Last evening Oct 20,2026 while driving the engine light came on, vehicle computer stated “ Issue with Engine / Transmission System Schedule service now.” This is the third time the vehicle will be at the GM dealer for diagnosis. Two times previous, dealer stated “unable to duplicate customer’s complaint.” We have owned this 2026 GMC truck for 8 months, purchased new and have nothing but issues which no GM dealer seems to be aware of nor can duplicate. This vehicle is unreliable and now has sat out of service awaiting a diagnosis for over 15 days at two different dealers. We have opened our second case with GMC Customer Care’s with zero assistance. It is the duty of a manufacturer to provide consumers with a safe and reliable vehicle. My 2026 GMC Yukon Denali is not safe and puts me and my family at risk of engine failure and a potential accident. We have documented every event and have videos of described defective vehicle operation.

Filed Oct 14, 2026 · Engine · NC

High oil consumption, will have oil changed and days later need oil, catalyst converter failed causing what was said for the check engine light to come on, truck now has a shutter around 50 mph, my radio is in and out, and sometimes it sounds like a computer shutting down. It has been one thing after the next.

Filed Oct 14, 2026 · Engine, Transmission · LA

On 9/11/26 the Yukon XL flashed a check engine light and message stated to service within 7 business days. 30 seconds later the power shut off and barely coasted to the side of the highway. Engine would turn over but not start. Could not shift into neutral b/c wouldn’t start. Error message: ECM - Engine and Transmission SystemP102AThe Engine and Transmission System is not performing as expected. An issue has been detected in the Fuel Management System used to maintain, control and monitor fuel consumption. If the check engine light is flashing, a misfire condition has been detected. A misfire increases vehicle emissions and could damage the emission control system on the vehicle. Please reduce vehicle speed, avoid hard accelerations, avoid steep uphill grades, and reduce any cargo loads such as a trailer.Service within 7 days Had vehicle towed to dealership. Was repaired and picked up on 9/25/26. Paid for new battery over $400.00 On 9/29/2026 Yukon XL would not shift into reverse. The error message on the car stated. TCM - Engine and Transmission SystemP2718. Odometer: 76117 Miles

Filed Oct 12, 2026 · Engine · MI

While driving there was a noise that started in the engine area. The vehicle was going 55-60 mph at the time it started. It became more and more frequent. The check engine light came on just before the engine completely seized up and lost all power. Dealership is saying there is definitely internal engine noise and engine failure.