NHTSA complaint #11765459

Owner complaint summary

2025 Lincoln Navigator L Black Label. Vehicle has experienced an intermittent recurring condition involving unintended braking/deceleration and inability to accelerate normally. During an occurrence, the vehicle can begin slowing/braking without the driver commanding it and then may not accelerate normally or travel much above approximately 30 mph despite accelerator input. There has also been abnormal cruise-control behavior associated with an occurrence. The condition has been experienced by three different drivers. During the most recent occurrence, the unexpected deceleration created a risk of being struck from behind. The vehicle was previously presented to an authorized Lincoln dealership for a documented braking concern beginning in December 2025. The dealership subsequently replaced and programmed the electronic brake booster. The braking/deceleration condition has since recurred. The vehicle is currently at an authorized Lincoln dealership. The dealership reports that no current diagnostic trouble codes are present and that it has been unable to duplicate the condition during limited testing. The dealership and Lincoln have recommended that I participate in a test drive to attempt to reproduce the condition. Because the reported malfunction involves unexpected braking/deceleration and loss of normal acceleration, I do not feel safe being inside the vehicle while it is driven for the purpose of intentionally attempting to reproduce the event. The vehicle remains with the dealership while the condition is being investigated.