Flash: 845RE Transmission Shift Enhancements
This bulletin involves reprogramming the Transmission Control Module (TCM) with the
latest available software.
A small number of customers may experience one or more of the following
Symptom/Condition(s) and/or a Malfunction Indicator Lamp (MIL) due to an erroneous
Diagnostic Trouble Code (DTC):
? P1DCD - TCM monitoring processor performance multiple clutches locked up.
? P1B13 - Park-By-Wire unintended out of park position.
? P0734 - Gear 4 Shift Incorrect Ratio set in the TCM memory.
? Harsh or erratic 8-6 downshift during freeway driving.
? Harsh or erratic 6-4 and/or 6-3 downshift during city driving.
? Harsh or erratic upshifts while in Sport Mode.
? Less than desired downshift timing (longer time to downshift than expected).
? Less than desired downshift feel during coasting decelerations and while passing.
? Less than desired shift feel when shifting from reverse to drive or drive to reverse
while the vehicle is stationary (i.e. garage shift).
? Less than desired upshift feel during normal non-aggressive driving.
? Less than desired powertrain performance at higher altitudes.
? Less than desired paddle shifter operation.
