024 GMC Sierra 2500 Denali Ultimate, which has suffered: -??Five catastrophic engine failures at highway speeds. -??Total brake failure, leaving the truck unable to stop. -??Severe electrical malfunctions, including flickering headlights at night. -??Retaliatory actions from General Motors after I refused to waive my legal rights. I have documented proof, including GM-??s own service records, emails, and a 7-minute recorded statement from GM-??s highest-level technician, confirming that GM installed the wrong computer module (1500 series instead of the required 2500 series) in my truck. Additionally, I have evidence that GM executives instructed technicians to conduct diagnostics, take apart the engine, and reassemble it-?"but NOT repair the defect-?"after I refused to sign an affidavit waiving my rights. Due to these failures, I suffered a dislocated shoulder in one of the incidents, and my [XXX] daughter remains traumatized to this day. Given the immediate danger this defect poses to other GMC Sierra 2500 owners, I respectfully request that NHTSA open an investigation and consider issuing a recall before a tragedy occurs. 1. Engine Failures Since 3,000 Miles -?" GM-??s Own Work Orders Confirm Issue Since purchasing my 2024 GMC Sierra 2500 Denali Ultimate, I have experienced five catastrophic engine failures, all occurring while traveling at highway speeds (70 mph): -??The truck suddenly lost power, dropping from 70 mph to 5-10 mph within seconds. -??This created an immediate risk of being rear-ended or losing control on the highway. -??GM-??s own service records confirm that my engine issues began at just 3,000 miles. -??GM dealerships misdiagnosed the issue FOUR TIMES, returning my truck to me in an unsafe condition. -??The real cause was only identified after the FIFTH failure, when a GM-certified head technician finally determined that GM had installed the wrong computer module (1500 series instead of 2500 series). This means that for months, GM knew my vehicle w INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA

- Richmond, TX, USA

Vehicle surges and stays at 1700 rpm in low range four wheel drive when accelerator pedal is touched Dangerous situation if someone or something is in its path. Dealer is aware of the problem but is unable to repair, says it is inherent on those vehicles for the last couple of model years. (i can't safely hook up a trailer in low range 4X4)

- Topton, NC, USA

The contact owns a 2024 GMC Sierra 2500. The contact stated that while driving 30 MPH, the check engine malfunction and Electronic Stability Control system malfunction warning lights illuminated. The contact was inadvertently locked out of the vehicle and was unable to open the tailgate. The contact disconnected the battery to cancel the warning lights; however, the tailgate still failed to open. The vehicle had not been taken to the dealer to be diagnosed or repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 1,000.

- Cypress, TX, USA