Ford Mustang 2021 — technical service bulletin
Bulletin SSM 49511 · NHTSA communication 10186652 · issued Jan 29, 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 a condition of the high voltage battery coolant expansion tank reading over the max fill line. The max fill line may be disregarded, only the min line is relevant. Do not attempt to remove coolant from the high voltage battery coolant expansion tank if the coolant level is above the max fill line.
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.