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U0100 on the 2021 Ford Mustang Mach-E

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.

Nobody has written a description of this code yet.

Bulletins for this model year that name U0100
SSM 545742026-02-17. Service bulletin. Some 2021-2022 Mustang Mach-E vehicles may exhibit a "Parking Brake Failure, Service Immediately message displayed in the instrument panel cluster (IPC) and diagnostic trouble codes (DTCs) C2007, C2008, C1034, U0293 and/or U0100 stored in the anti-lock brake system (ABS) module. To correct the condition, follow the technical instructions outlined FSA 22P31 (US) or 22B47 (Canada) for an appropriate repair direction.
TSB 25-20712025-03-18. Service bulletin. This article supersedes TSB 21-2405 to update the production fix date. Some of the vehicles listed in the Model statement above may exhibit all of the following conditions: * Illuminated powertrain malfunction indicator (wrench) lamp and/or "Shift System Fault" message * DTC U0103:87 stored in the secondary on board diagnostic module (SOBDMC) Some vehicles may also exhibit DTCs U0100:00, U0121, U0140, and/or U0155 stored in the gear shift module (GSM). This may be due to the software in the GSM. *****Model section: built on or before 30-Sep-2021
TSB 22-21432022-04-26. Service bulletin. Some 2021-2022 Mustang Mach-E vehicles built on or before 15-Mar-2022 may exhibit a Parking Brake Fault Service Now message in the instrument panel cluster (IPC) and DTCs C2007, C2008, C1034, U0293 and/or U0100 in the antilock brake system (ABS) module. This may be due to an open/corroded circuit near the rear caliper. To correct the condition, follow the Service Procedure to replace the electronic parking brake (EPB) connector.
TSB 21-24052021-12-01. Service bulletin. Some 2021 Mustang Mach-E vehicles built on or before 09-Sep-2021 may exhibit an illuminated powertrain malfunction indicator (wrench) lamp and/or display the message Shift System Fault Service required with DTC U0103:87 stored in the secondary on board diagnostic module (SOBDMC). Some vehicles may also exhibit DTCs U0100:00, U0121, U0140, and/or U0155 stored in the gear shift module (GSM). This may be due to the software in the GSM. To correct the condition, follow the Service Procedure to reprogram the GSM.

4 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.