Chevrolet Corvette 2020–2023 — technical service bulletin
Bulletin 23-NA-156 · NHTSA communication 10243718 · issued Sep 8, 2023
Technical service bulletin
communication type
Power Train
component
2020–2023
model years
4
vehicle entries
Official summary
This service bulletin informs the technician on the running changes to the M1L automatic transmission.
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.