Flash: Transmission Control Module (TCM) Updates The customer must describe one or more of the following:...

Bulletin number

21-015-25

Component

Power train

Summary

"Flash: Transmission Control Module (TCM) Updates The customer must describe one or more of the following: ● Bump or jerk felt during Engine Start/Stop (ESS) operation in normal and snow modes. ● Bump during tip-in downshift while in Normal or Sport modes. ● Transmission shifting concerns when vehicle has less than 1500 miles (2414 Km). ● Driveability concerns and not holding correct gear during downgrade, snow mode and accelerator tip-out maneuvers. This bulletin involves reprogramming the BPCM, MCP A, MCP B and the EVCU with the latest available software and then, if needed, performing a Wheel End Disconnect Position Learn routine"

Owners of these vehicles have filed 52 complaints in the transmission category.