Flash: Transmission Shift Enhancements
This bulletin involves reprogramming the Transmission Control Module (TCM) with the
latest available software.
? ECO mode will not retain settings. If ECO mode is turned off, it will turn back on
after the ignition is cycled.
? 3-2, 2-1 Shift bump on deceleration.
? Less than desired shift quality during hard acceleration.
? Excessive shifts during cruise control operation.
? Intermittent delay shift condition.
? Less than desired engine braking during downhill descent.
? Manual gear selection improvements at higher altitudes.
? Less than desired driveability performance in 4 low.
? Hesitation improvements.
? Inconsistent and/or harsh 1-2, 2-3, 3-4, 4-5 upshifts at moderate throttle.
? Inconsistent and/or harsh lift-foot upshifts.
? Inconsistent and/or harsh coasting 3-2, 2-1 downshifts in Hi or Lo range.
? Ratio fault detection during 1-2 upshift or 8-7 downshift.
? Grade hunting (repeated shifting while ascending a grade).
? 8-7-8 shift busyness when approaching max vehicle speed.
? Undesired gear selection at high altitude.
? Undesired gear selection when driving downhill (not enough powertrain braking).
? Time to exit TIP (manual/paddle shift mode) takes too long.
? Unintended downshifts driving at certain speeds.
? 4-3 coasting downshift may cause excessive engine noise during engine braking.
? Shift hanging when vehicle is started cold.
? Undesired shift toggling in Manual/Paddle Shift mode.
? Lo range selec-speed control 1-2 shift busyness.
