21-015-25 REV.A

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):
• P1B14 - Park By Wire Unintended Park Position.
• P1DF3 - ECU Not Initialized.** The customer must describe one or more of the following:
• **Secure Idle feature not working with Powerpanel on.
• When the driver tries to shift from Drive to Reverse and vice versa, transmission detects a mismatch in Neutral as the gear shifter goes from Drive to Reverse through Neutral (D-N-R or R-N-D) and flashes the Neutral indication blinking on the shifter.
• The transmission continues to stay in Park sometimes when the driver shifts to Drive or Reverse via gear shifter. Warning message on the Instrument Panel Cluster (IPC) and Check Engine Lamp ON.
• The gear shifter takes too long to get ready when the driver starts the car, and the transmission system couldn't recognize which gear was selected. Warning message on the IPC and Check Engine Lamp ON.
• Driver is able to move the shifter with engine off and key on while the transmission is in Park and a warning message is displayed in the IPC "Shift to Park to Start"
• Auto Parking is not working when the transmission goes to neutral.
• Engine over revs in manual mode.**
• 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 2414 Km (1500 miles).
• Driveability concerns and not holding correct gear during downgrade, snow mode and accelerator tip-out maneuvers. This bulletin involves reprogramming the TCM with the latest available software.