Some units of the 2023 Corvette Z06 DCT were installed with the wrong main control valve body, affecting the mid-engine sports car’s eight-speed dual-clutch transmission.
To address the issue, GM has released a new Customer Satisfaction Program.

The Customer Satisfaction Program is tagged with reference number N232418320 & was released in January 2024.

The program only affects units of the Corvette Z06 produced for the 2023 model year.
GM did not specify the number of units potentially affected by this issue.
The main control valve body is a major component of the transmission, with this new Customer Satisfaction Program affecting the C8 Z06’s dual-clutch eight-speed automatic transmission (RPO code M1M) co-developed with Tremec.
To address this issue, dealers are instructed to replace the incorrect main control valve body with the correct unit. It’s estimated that the procedure will take 4.6 hours of labor time to complete.

The M1M dual-clutch eight-speed automatic transmission is exclusive to the 2023 Corvette Z06.

Although the transmission is similar to the M1L unit equipping the C8 Corvette Stingray, the M1M in the C8 Corvette Z06 includes a shorter 5.56 final drive ratio.