2021 LINCOLN NAVIGATOR Power Train Problems

While driving, the vehicle repeatedly hesitated during gear changes, lost power, and then abruptly jerked back into gear. This occurred intermittently for over a month without any warning messages, creating unpredictable and unsafe driving conditions. As the issue worsened, the vehicle began losing power more frequently. The most serious event occurred at highway speed, where the vehicle suddenly lost propulsion in the middle of active traffic, nearly causing a stall. This created an immediate safety hazard for myself and surrounding drivers. After several seconds, the vehicle violently re-engaged into gear and surged forward. Only at this point did the vehicle display a warning: “Powertrain Malfunction / Reduced Power.” I scanned the vehicle and retrieved DTC P0734 – Gear 4 Incorrect Ratio, a code associated with internal transmission faults. A dealership inspected the vehicle and reported that the CDF drum had failed. They stated they could not guarantee that replacing the...

Navigator transmission goes into neutral when accelerating at speeds of 50+. Trans completely overhauled. Still does it. Almost had 2 accidents when changing lanes on the freeway, trying to accelerate and instead slowing down with cars behind fast approaching . When trying to pass on a 2-lane hwy, this would be deadly.

Car stalls often. Was not able to go through intersection. Held up traffic. Another incident was I was almost rear ended when car lost power. This is dangerous and not just an inconvenience.

Within one week of delivery of this new vehicle, the transmission began slipping out of gear and the car loses power for 30-40 seconds in the middle of driving. Shift System Fault, Transmission failure, and PowerTrain Malfunction are the errors coming up on the screen- even after the vehicle was in Service for 2 weeks and they replaced the transmission valve system. Very dangerous to completely lose power on the highway.