This article supersedes TSB 24-2189 to update the service procedure and add 2025 affected vehicles

Bulletin number

TSB 25-2513

Component

Power train

Summary

This article supersedes TSB 24-2189 to update the service procedure and add 2025 affected vehicles. Some 2021-2025 F-150 non-Raptor vehicles equipped with an 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.

Owners of these vehicles have filed 732 complaints in the transmission category.