Some 2021-2022 F-150 vehicles built on or before 22-Feb-2022 may experience a false alarm activation event with a trailer connected and/or a U0143:87 stored in the trailer module (TRM). Vehicles that exhibit a false alarm activation may also display a Security System Detected A Trailer Disconnect message in the FordPass app. This may be due to various software parameters in the TRM. To correct the condition, follow the Service Procedure to reprogram the TRM, driver door module (DDM) and the passenger door module (PDM).
