# 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

- [11028844](https://open.wenmarpro.com/bulletins/11028844), 2026-02-17: 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.
- [11015681](https://open.wenmarpro.com/bulletins/11015681), 2025-03-18: 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
- [10210475](https://open.wenmarpro.com/bulletins/10210475), 2022-04-26: 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.
- [10203653](https://open.wenmarpro.com/bulletins/10203653), 2021-12-01: 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.