General Motors has issued a Technical Service Bulletin for the 2020 Corvette due to a minor software glitch with the transmission control module (TCM).
According to the TSB, certain 2020 model-year Chevy Corvette vehicles “may have a condition where diagnostic trouble codes (DTCs) P1967 and/or P1968 may falsely set in the transmission control module due to a software misalignment.”
To remedy this issue, the TSB instructs dealer service departments to update the software in the TCM to a newer version. Owners who have accepted the terms and conditions to perform over-the-air (OTA) updates can also download this software update themselves at home, negating the need to bring the vehicle into the dealership.
Additionally, all 2020 Corvette and Corvette Convertible models currently sitting on Chevy dealer lots will be updated with the new software to avoid further problems down the line. Dealers will also automatically update the TCM software when a 2020 Corvette or Corvette Convertible is brought into the dealership during the warranty period for any reason.
Because this is a software update only, no parts are required for the repairs to be performed. All 2020 Corvette and Corvette Convertible models are affected by this issue. It’s worth noting that while GM has issued a TSB for this problem, it does not pose a safety risk to occupants of the vehicle, so there has not been an official federally mandated recall.
The 2020 Corvette is only available with an eight-speed dual-clutch automatic transmission, which is built by Tremec in Wixom, Michigan. GM recently reached an agreement with Canadian labor union Unifor to in-source some of the work for the eight-speed DCT at its St. Catharines Powertrain plant in southern Ontario, though it’s not exactly clear what this work may entail.