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What 46 owners told NHTSA about the 2025 GMC Yukon Denali Xl 1500

These are the actual owner complaints behind this car’s reliability verdict, filed with the federal government, unedited. They’re unverified reports, not confirmed defects: read them as leads for your pre-purchase inspection, not a diagnosis.

All (46)Crash / fire / injury (1)Engine (30)Electrical system (6)Driver assistance (5)Transmission & drivetrain (5)Brakes (2)Fuel system (2)Lane Departure (2)Airbags (1)Backup camera & sensors (1)Speed control (1)

2 of 46 complaints match · Lane Departure · clear filters

Feb 3, 2026Driver assistanceLane Departure

While driving on a highway, the vehicle intermittently experienced a sudden loss of engine power during acceleration, accompanied by a flashing check engine warning light. The most serious event occurred while merging into traffic, when the vehicle failed to accelerate normally and briefly lost power, creating a risk of being struck by faster-moving vehicles. After pulling over and restarting the vehicle, normal acceleration temporarily returned, but the problem has recurred multiple times. The malfunction appears to be related to an engine misfire or powertrain fault because the check engine light flashes during the events and an OBD scan has shown misfire-related diagnostic codes (random/multiple misfire and a cylinder-specific misfire). The condition is intermittent and typically occurs after the vehicle has been driven for approximately 10–45 minutes. The vehicle remains available for inspection. The vehicle has been presented to authorized service departments multiple times for diagnosis. The dealerships have reported that they were unable to duplicate the issue during road testing and no lasting repair has been completed. The manufacturer has been contacted and the vehicle has been inspected/diagnosed through authorized service channels, but the underlying cause has not been identified. The failure continues to occur intermittently and is a safety hazard because it affects acceleration in traffic. Incident list 10/25/2025 (~12:25 PM; ~3,108 miles) — While accelerating to merge onto a highway, the vehicle lost power and the check engine light flashed. The driver pulled over, shut the vehicle off, restarted, and the condition temporarily resolved, allowing the trip to continue. 10/27/2025–11/04/2025 — The same loss-of-power/misfire behavior recurred intermittently, typically lasting a few minutes before clearing. 11/05/2025 (~8:01 AM; ~3,641 miles) — The check engine light flashed again and symptoms consistent with misfire/loss of power were present. The

NHTSA ODI 11715402

Jan 21, 2026SteeringLane Departure

This has happened twice. Once in November 2025 and then in January 2026. With super cruise engaged while going around a curve super cruse disengages and the steering wheel turns to driving straight. You have about one or two seconds to take control or crash. This happened while driving about 70 mph on interstate I 70 and next on Ohio 122 going about 45 mph. On I 70 it was a gentle curve and on 122 it was a much sharper curve. Super cruse must give a warning that it about to disengage that is much longer than one or two seconds.

NHTSA ODI 11712431

Working with the data? Download all 46 complaints as CSV · fetched from NHTSA July 25, 2026

How to use these: a complaint is one owner’s report, filed voluntarily and published unverified. Patterns matter more than any single story. If several owners describe the same failure at similar mileage, put that system at the top of your pre-purchase inspection list. Back to the full 2025 GMC Yukon Denali Xl 1500 verdict →