NHTSA Complaint #11716907 — 2026 GMC YUKON XL

I am submitting this complaint to report a safety defect involving a 2026 GMC Yukon XL AT4 equipped with the GM Brembo brake upgrade. The vehicle is sold as equipped with a full-size spare tire; however, the spare tire/wheel supplied cannot be mounted due to interference from the brake calipers. This incompatibility was discovered only after a flat tire event on [XXX], during which the vehicle could not be safely returned to service. The Brembo brake upgrade is a GM-designed option that is installed by the dealer in all cases. Despite this, the vehicle was delivered with emergency equipment that is unusable in the event of a flat tire. GM has acknowledged the incompatibility and relies on a warning label placed beneath the vehicle, rather than providing a compatible spare or disclosure at the point of sale. This defect resulted in a prolonged roadside emergency involving an elderly passenger and a failure of manufacturer-provided roadside assistance. I believe this condition affects all vehicles equipped with the Brembo brake upgrade and represents a systemic safety issue involving emergency preparedness and disclosure. Supporting documentation and a detailed incident narrative are available upon request. [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)