Ford Bronco Sport 2020–2021 — technical service bulletin
Bulletin 21B19 · NHTSA communication 10191184 · issued Apr 9, 2021
Technical service bulletin
communication type
Electrical System
component
2020–2021
model years
3
vehicle entries
Official summary
In all of the affected vehicles, the AWD module was assembled with an incorrect transistor that controls the transition between AWD and 2WD. When this transistor fails the vehicle will remain in either AWD or 2WD and not transition between the drive states. This can cause the wrench light to illuminate in the instrument cluster.
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.