Ford Mustang Mach E 2021 — technical service bulletin
Bulletin TSB 21-2091 · NHTSA communication 10189793 · issued Mar 25, 2021
Technical service bulletin
communication type
Electrical System
component
2021
model years
1
vehicle entries
Official summary
Some 2021 Mustang Mach-E vehicles may exhibit the 12-volt battery becoming discharged while the vehicle is plugged in during the high voltage charging process. This may be due to the parameters in the powertrain control module (PCM). To correct the condition, follow the Service Procedure to reprogram various modules starting with the PCM.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.