Buick Enclave 2018 — technical service bulletin
Bulletin 18NA091 · NHTSA communication 10198840 · issued May 24, 2021
Technical service bulletin
communication type
Power Train
component
2018
model years
2
vehicle entries
Official summary
This technical bulletin provides a procedure for software update and transmission flush to correct a slight shutter felt during gear shift.
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.