Honda Accord 2018–2021 — technical service bulletin
Bulletin A21-049 · NHTSA communication 10194464 · issued May 18, 2021
Technical service bulletin
communication type
Electrical System
component
2018–2021
model years
4
vehicle entries
Official summary
Service Bulletin - The MIL comes on with DTC P0236 (Turbocharger Boost Sensor Circuit Range/Performance Problem) stored.
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.