Toyota RAV4 Prime 2021 — technical service bulletin
Bulletin T-SB-0111-20 · NHTSA communication 10184541 · issued Nov 6, 2020
Technical service bulletin
communication type
Equipment
component
2021
model years
3
vehicle entries
Official summary
TSB: When certain vehicle ECUs are replaced, the ECU security key must be written in order for that ECU to communicate on the vehicle network. The Techstream Software Health Check Results screen has been enhanced to help identify if a replacement ECU requires an ECU security key. Follow the procedures in this bulletin to write the ECU security key to the replacement ECU.
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.