Service Information repair procedures have been updated for repairs to the Dual Clutch Transmission (DCT) (RPO M1L) on 2020-2024 Corvette models.
After making repairs to the DCT, including Main Control Valve (MCV) and direct clutch replacement (Fig. 7), it is no longer required to characterize the MCV and direct clutch Part Unique Number (PUN) in the Transmission Control Module (TCM).
Fig. 7
Technicians must still characterize Shift Activation (SAV) and transmission assembly replacements. During this procedure, there may be some confusion when comparing the service tool with the Service Information instructions. Service Information is very detailed in specifying that the 22-digit PUN is needed. There is a 21-digit and 22-digit PUN on these parts.
The supplier uses the 21-digit PUN for production parts and the 22-digit PUN (Fig. 8, #10) is used in service. Only the 22-digit PUN should be entered when TCM programming.
Fig. 8
When a production part is shipped it does not contain the 22-digit PUN required for characterization. Performing the Service Fast Learn procedure after SAV and transmission assembly replacements allows the TCM to adequately learn the flow and fill characteristics of the new parts.
TIP: If direct clutch or MCV PUN characterization has been attempted and fails, select Refresh Characterization Data and use the Transmission Unique Number (TUN) from the transmission assembly. (Fig. 9)
Fig. 9
For additional information, refer to #PIP5781A.
– Thanks to Steve Schipansky
