2021 Lincoln Navigator Engine Problems

I am reporting a serious intermittent transmission and loss-of-propulsion problem with my 2021 Lincoln Navigator, VIN 5LMJJ3LT6MEL05416. While driving, including at highway speeds, the transmission will unpredictably behave as though it has shifted into Neutral even though the vehicle remains in Drive. When I press the accelerator, the engine responds, but the vehicle temporarily has little or no propulsion. The transmission may then suddenly re-engage and slam or bang forcefully back into gear. This can also happen under very light throttle. I may gently press the accelerator expecting normal acceleration, but instead the vehicle acts as though it is in Neutral before suddenly engaging again. The condition is intermittent and cannot be reliably reproduced on demand, which makes it especially dangerous and unpredictable. I am concerned about losing propulsion while merging, passing, entering traffic, or attempting to accelerate away from another vehicle at highway speeds. The vehicle has previously had transmission adaptive learning/reset procedures performed, but the problem continues. I am aware that Ford/Lincoln has issued technical service information addressing momentary neutral-out, delayed engagement, harsh engagement, and other 10R80 transmission concerns on this generation of Navigator. I am also aware of Ford recall 26S48 / NHTSA recall 26V402 involving certain 2018–2021 Lincoln Navigators. I am not claiming that the recall is definitively the cause of my specific condition, but I believe this intermittent loss of propulsion presents a serious safety concern that should be investigated. I am requesting that NHTSA document and investigate this loss-of-propulsion / neutral-out condition because the vehicle can unexpectedly fail to accelerate and then violently re-engage the transmission while in motion.

NHTSA ID

11760540

Incident

Aug 27, 2026

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 drum would resolve all issues and provided two estimates: $5,600 for a partial internal repair/$8,700 for full transmission replacement. The 10R80 transmission has a documented history of failures, including harsh shifting, slipping, unexpected gear disengagement, and internal component defects. These issues are addressed in multiple Ford Technical Service Bulletins involving P0734, harsh/failed shifts, and failures related to the CDF clutch cylinder/drum. Many vehicles of the same make and model are covered under related recalls or service actions for similar problems; however, my VIN is not included, and Lincoln declined to honor the existing recall. This defect presents a serious safety risk due to: Sudden loss of power while driving, including at highway speeds, Unpredictable re-engagement and violent surging, Loss of propulsion without warning, leading to near-stall conditions. This powertrain malfunction is a known, unsafe, repeat issue among these vehicles equipped w/this transmission.

NHTSA ID

11716941

Incident

Feb 2, 2026

[XXX] Wednesday we were traveling from Charlotte NC headed westbound on [XXX], a 6 or 8 lane highway, speed limit 70+ mph, when our 2021 Lincoln Navigator suddenly lurched and the engine completely failed. There weren't any warnings by the vehicle prior to the incident. There were two of us in the vehicle at the time, and we suddenly found ourselves in a situation of extreme risk. It was 4 - 5 pm during rush hour traffic. The driver was able to maintain composure and our tires continued rotating long enough to coast and cross over 3 fast moving lanes to get us slightly off the side of the highway. It was a very frightening and unsafe situation, not only during but after the engine failure, as we were on a very busy, noisy highway not knowing where we were or what to do. We live in Ohio and our plans were scheduled only for 8/25/24 (leave Ohio)-8/29/24 (return to Ohio). Our Lincoln was towed the night of the engine failure to Classic Ford Lincoln in Shelby NC, and it's been there for 7 days. The tow driver could not start the engine. He had difficulty (20 minutes trying) getting it into neutral so he could put it on the flatbed. The total engine failure problem isn't yet diagnosed. Classic is the only one to examine it. We had to extend our NC hotel stay for two days waiting for the vehicle to be repaired. On 8/31 we couldn't wait any longer and had to rent a vehicle from Enterprise to return home; leaving our Navigator in NC. Lincoln Roadside Assistance has been very difficult and inattentive to our dire circumstances. We're now faced with a situation of not having our vehicle, not having a diagnosis, and concerns about whether the vehicle will be dependable when/if it's returned to us. We have to travel often and fear Lincoln could leave us in bad circumstances again even if they can find the current problem and repair it. It seems to be something extraordinary or uncommon or a diagnosis would have happened by now. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA),

NHTSA ID

11613736

Incident

Aug 28, 2024

The contact owns a 2021 Lincoln Navigator. The contact received notification of NHTSA Campaign Number: 22V346000 (Engine) however, the part to do the recall repair was unavailable. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The contact had not experienced a failure. Parts distribution disconnect.

NHTSA ID

11490782

Incident

May 17, 2022

The contact owns a 2021 Lincoln Navigator. The contact received notification for NHTSA Campaign Number: 22V346000 (Engine) however, the part to do the recall repair was unavailable. The dealer was contacted after receiving the recall notification and the contact was informed that parts were not available because the cause of the defect was not yet determined. The contact was then notified that the recall had been divided into two separate recalls requiring two different repairs to fix the vehicle. The contact scheduled an appointment with the dealer for a routine maintenance check; while at the dealer, she was informed that there was still no resolution to the recall. Once the contact picked up her vehicle, she was informed that the recall was serviced. The contact was informed that the ground wires connected to the battery and cooling systems were shrink wrapped which she would prevent the under-hood fire failure. The contact expressed concerns with the dealer, noting that the plastic shrink wrapping would melt under a hot engine and would not resolve the recall. The contact made multiple attempts to reach the manufacturer but had no success. The contact had not experienced a failure. Parts distribution disconnect.

NHTSA ID

11480120

Incident

May 1, 2022

The contact owns a 2021 Lincoln Navigator. The contact received notification of NHTSA Campaign Number: 22V346000 (Engine) and 22V250000 (Visibility) however, the part to do the recall repairs was unavailable. The local dealer was contacted and it was confirmed that parts were not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The contact had not experienced a failure. VIN tool confirms parts not available.

NHTSA ID

11468944

Incident

Jun 1, 2022

The contact owns a 2021 Lincoln Navigator. The contact received notification of NHTSA campaign numbers: 22V250000 (Visibility) and 22V346000 (Engine) however, the parts to do the recall repairs were unavailable. The local dealer was contacted and it was confirmed that parts were not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repairs. The manufacturer was not made aware of the issue. The contact stated that the driver’s side windshield wiper experienced the failure listed in 22V250000 (Visibility). The failure mileage was unknown. VIN tool confirms parts not available.

NHTSA ID

11468033

Incident

Mar 25, 2022

The contact owns a 2021 Lincoln Navigator. The contact received notification of NHTSA Campaign Number: 22V346000 (Engine) however, the part to do the recall repair was not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The contact had not experienced a failure. VIN tool confirms parts not available.

NHTSA ID

11467217

Incident

May 28, 2022