Some 2021-2024 F-150 non-Raptor vehicles equipped with 4WD and ESOF transfer case (minor feature code...

Bulletin number

TSB 24-2189

Component

Power train

Summary

Some 2021-2024 F-150 non-Raptor vehicles equipped with 4WD and ESOF transfer case (minor feature code FMLAS) may exhibit an intermittent grinding/hum/rumble noise from the front wheel area while in 2WD that goes away when the vehicle is put into 4WD. These vehicles will also have no diagnostic trouble codes (DTCs) stored in the transfer case control module (TCCM). To confirm a vehicle is built with a certain minor feature code, review the build information by double-clicking the vehicle identification number (VIN) in the upper left corner in the Professional Technician System (PTS). This may be due to incomplete disengagement of the integrated wheel end (IWE) actuator assemblies. To correct this condition, follow the Service Procedure to replace IWE actuator assemblies

Owners of these vehicles have filed 705 complaints in the transmission category.