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Service bulletins for the 2020 Chevrolet Corvette

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

924 on file from NHTSA, as of 2026-10-19.

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By component

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Only bulletins with component: Transmission control module are shown. Show all

Bulletins, newest first
PIP5781A2024-02-12. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE:SOFTWARE; COMMUNICATION; UNKNOWN OR OTHER. This Preliminary information communicates that characterizing certain parts is no longer required, the service instruction was changed but technicians are still trying to perform the function causing further confusion.
N2123369622023-03-08. Service bulletin. POWER TRAIN; UNKNOWN OR OTHER; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE:SOFTWARE; ELECTRICAL SYSTEM. Emission Recall. General Motors has decided to conduct a Voluntary Emission Recall involving certain vehicles. The Transmission Control Module (TCM), after detecting a loss of communications fault with other control modules, may incorrectly clear the loss of communications Diagnostic Trouble Codes (DTCs) when the vehicle is keyed off and, if the loss of communications fault persists, may not detect it again when the vehicle is keyed back on. If this were to happen, the transmission could operate in a default mode with no DTC set and the MIL not illuminated. Dealers are to reprogram the Transmission Control Module (TCM) with updated software.
PIP5621C2022-10-17. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM); POWER TRAIN. This Preliminary information communicates to the dealer technician that TAC recommends the utilization of the GDS2 software to aid in diagnosing automatic transmission concerns. TAC is requesting the GDS2 session logs be sent in before the dealer contacts TAC.
21NA0332022-05-31. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM); POWER TRAIN. This service bulletin provides a procedure to perform a transmission solenoid clean procedure 3 times depending on what DTC has set.
PIP5797C2022-03-14. Service bulletin. POWER TRAIN; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). This Preliminary information communicates the need to replace the transmission assembly for faults related to non-serviceable internal parts..

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.