21-045-25

Flash: Transmission Control Module (TCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs):
• P0827-00 - Up and Down Shift Switch Circuit Low.
• P0826-00 - Up and Down Shift Switch Circuit.
• P085F-00 - Up and Down Shift Switch Circuit Range/Performance. The customer may describe one or more of the following:
• Vehicle stuck in default gear, and possibly stranded for many minutes.
• Rough or bumpy 2-3 power on upshifts and/or 3-2 coast down shifts.
• Vehicle enters into limp home mode. In addition, the following software enhancement is available:
• Decreased sensitivity to DTCs P1D8A and P1D8 This bulletin involves reprogramming the TCM with the latest available software.