21-027-25 REV. A

Flash: Transmission Control Module (TCM) Updates *Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle may 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.**
• P1DCD-00 - TCM Monitoring Processor Performance Multiple Clutches Locked Up. Customers may also experience one or more of the following:
• **Vehicle stuck in default gear, and possibly stranded for many minutes.
• Rough/bumpy 2-3 power on upshifts and/or 3-2 coast down shifts.**
• Vehicle enters into limp home mode. **Other software improvements:
• Decreased sensitivity to faults P1D8A and P1D8B.* This bulletin involves inspecting the TCM software level and possibly reprogramming the TCM with the latest available software