Chevrolet Corvette 2020–2023 — technical service bulletin
Bulletin 23-NA-139 · NHTSA communication 10242203 · issued Aug 9, 2023
Technical service bulletin
communication type
Power Train
component
2020–2023
model years
4
vehicle entries
Official summary
This service bulletin advises the tech on what to do if the specific codes P1955 and/or P0867 have been set for the transmission to correct customer concerns of a Service Transmission Message Displayed on Driver Information Center (DIC), Malfunction Indicator Lamp (MIL) Illuminated.
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.