# Service bulletin TSB 21\-2405

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10203653
- Published by NHTSA: 2021\-12\-01
- Manufacturer's number: TSB 21\-2405
- Manufacturer's date: 2021\-11\-17
- NHTSA component: ENGINE AND ENGINE COOLING; ELECTRICAL SYSTEM; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\)

## NHTSA's summary

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.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10203653-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10203653-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Electrical system, Engine, Transmission and driveline, Automatic transmission, Transmission control module

## Trouble codes named

U0100, U0103, U0121, U0140, U0155

## Vehicles listed

- 2021 FORD MUSTANG MACH E

## Recalls for the same vehicles and component

- [22V333000](/recalls/nhtsa/22V333000.md), 2022-05-13: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE:SOFTWARE; VEHICLE SPEED CONTROL

## Other bulletins for the same vehicles and component

- [TSB 23\-2399](/bulletins/10248358.md), 2024-01-05, Service bulletin: ELECTRICAL SYSTEM; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\). Some 2021\-2023 Mustang Mach\-E vehicles may exhibit a condition where the high voltage battery stops charging when connected to level 1 or level 2 chargers with an illuminated malfunction indicator lamp \(MIL\) and diagnostic trouble code \(DTC\) P2C94 stored in the secondary on\-board diagnostic control module A \(SOBDM\). This may be due to the software in the SOBDM. To correct this condition, follow the Service Procedure to reprogram the powertrain control module \(PCM\).
- [TSB 23\-2168](/bulletins/10237140.md), 2023-06-01, Service bulletin: ELECTRICAL SYSTEM; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE:SOFTWARE; UNKNOWN OR OTHER; ELECTRICAL SYSTEM:SOFTWARE. Some 2021\-2022 Mustang Mach\-E vehicles equipped with all\-wheel drive \(AWD\) may exhibit a whine noise from the front drive unit when driving steady speed between 30\-40 mph \(48\-64 km/h\) without diagnostic trouble codes \(DTCs\) present. This may be due to software parameters. To correct the condition, follow the Service Procedure to reprogram the powertrain control module \(PCM\)

JSON: [/v1/bulletins/10203653](/v1/bulletins/10203653)

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