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U2100 on the 2024 Ford F-150

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

This code is specific to a manufacturer and is not described here. Its meaning is in the manufacturer's service information.

Bulletins for this model year that name U2100
SSM 549402026-06-22. Service bulletin. Some 2021-2026 F-150 vehicles may exhibit a U2100:00 diagnostic trouble code (DTC) for initial configuration incomplete stored in the trailer control module (TRM). This may be due to the vehicle having a Ford accessory trailer brake kit installed without being programmed following the included instructions. If the vehicle was built with minor feature code FDDAA and a trailer brake gain switch is present in the stock location in the instrument panel, a Ford Accessory trailer brake kit has been installed on the vehicle. If a Ford Accessory trailer brake kit is present, download and run the "TRM - Towbar Configuration" application using the latest software level of the Ford Diagnosis and Repair System (FDRS) scan tool. 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).
SSM 535692025-04-09. Service bulletin. Some 2021-2025 Ford and Lincoln vehicles may exhibit diagnostic trouble code (DTCs) U2100 and/or U3002 stored in the cruise control module (CCM), side obstacle detection control module LH (SODL), side obstacle detection control module RH (SODR), side obstacle detection control module C (SODCMC) and/or side obstacle detection control module D (SODCMD) after a module replacement.
SSM 530182024-10-08. Service bulletin. Some 2021-2024 Ford and Lincoln vehicles may exhibit diagnostic trouble codes (DTCs) U2100 and/or U3002 stored in the cruise control module (CCM), side obstacle detection control module LH (SODL), side obstacle detection control module RH (SODR), side obstacle detection control module C (SODCMC) and/or side obstacle detection control module D (SODCMD) after a module replacement.

3 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.