Two problems related to automatic transmission control module have been reported for the 2020 Lincoln Navigator. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2020 Lincoln Navigator based on all problems reported for the 2020 Navigator.
On August 20, 2026, while traveling about 45 mph, I accelerated to merge onto a highway while passing a slow-moving semi, with traffic approaching from behind. The transmission unexpectedly disengaged and the vehicle completely lost propulsion. The gear indicator showed neutral. The engine rapidly increased rpm/redlined but the vehicle would not accelerate. I pressed the drive selector to re-engage the transmission. The vehicle lurched/slammed before drive engaged and propulsion returned. This created a serious collision risk while merging into highway traffic. This is not an isolated incident. For approximately four years the vehicle has intermittently exhibited rough/abnormal shifting or slipping during acceleration, progressively worsening. During a previous loss-of-propulsion incident on a two-lane highway, the failure occurred while passing a semi with oncoming traffic, creating a risk of a head-on collision. We repeatedly discussed the transmission problem with dealership personnel. Because it was intermittent, the dealer said diagnosis required leaving our primary family vehicle for several weeks, without a loaner. The selling dealer, about six hours away, later offered to retrieve the vehicle and provide a loaner, but canceled because no loaner was available. The defect was therefore never successfully diagnosed or repaired. After the August 20 incident, dealer-provided connected-vehicle diagnostics recorded a powertrain system fault and tcm codes p27b5 (transmission gear ratio control performance), p2796 and p07e6. The vehicle is parked and available for inspection because I consider it unsafe to drive. It is also subject to open NHTSA recall 26v402/Ford 26s48 involving the transmission/parking system; no remedy is currently available.
2020 Lincoln Navigator, 10r80 transmission. Following two full transmission replacements, torque converter replacement, valve body replacement, and transmission pump repair, vehicle continues to exhibit hesitation under acceleration, harsh and delayed shifting, loss of power, shaking beginning at approximately 28-30 mph felt through the floorboard, and abnormal fuel consumption. Independent tire shop ruled out tires as cause. Safety recall o1 for pcm reprogramming remains incomplete on this VIN despite multiple service visits. Vehicle has been at dealership since early-March with no confirmed repair date or Ford engineer visit scheduled.
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| Automatic Transmission Control Module problems |