Buick Envision 2016–2021 — technical service bulletin
Bulletin 21NA107 · NHTSA communication 10200126 · issued Jun 11, 2021
Technical service bulletin
communication type
Engine
component
2016–2021
model years
13
vehicle entries
Official summary
This technical bulletin provides repair information to correct a customer concern of the Service Engine Soon Lamp Illuminated and/or Service Brake Assist Message Displayed, with DTC P0557 Stored.
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.