Land Rover Defender 2020–2021 — technical service bulletin
Bulletin BIG5JAN21_42 · NHTSA communication 10186744 · issued Jan 13, 2021
Technical service bulletin
communication type
Electrical System
component
2020–2021
model years
2
vehicle entries
Official summary
Multi-ECU SOTA Update (OS 2.0.7) CHCM, GWM, SODL, SODR no-start condition after completing the update due to an issue with the Gateway Module (GWM).
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.