Land Rover Defender 2021–2022 — technical service bulletin
Bulletin N811 Letter 23MAY25 · NHTSA communication 11019321 · issued May 23, 2025
Technical service bulletin
communication type
Electrical System
component
2021–2022
model years
5
vehicle entries
Official summary
Door Zone Module - Quiescent Drain
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.