Land Rover Defender 2021 — technical service bulletin
Bulletin N578v4 · NHTSA communication 10219321 · issued Aug 24, 2022
Technical service bulletin
communication type
Electrical System
component
2021
model years
5
vehicle entries
Official summary
NON-START ISSUE
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.