Flash: Transmission Shift Enhancements

Bulletin number

21-049-15

Component

Power train

Summary

Flash: Transmission Shift Enhancements This bulletin involves selectively erasing and reprogramming the Transmission Control Module (TCM) with new software. The following Transmission Control Module (TCM) calibration improvements are available for vehicles equipped with WA580 Automatic Transmission (Sales Code DGJ) and are broken down per engine application. 3.6L Engine (LD/LX) ? Erratic shifting or poor performance complaints while driving up steep hills, towing, driving aggressively, or at high altitude during hot ambient temperatures. ? Poor performance when driving aggressively. ? Hanging in gear during HOT ambient temperature conditions and high engine loads. ? Excessive pedal needed to downshift in high altitudes (i.e. passing). ? Poor shift quality, or high transmission temperatures during track or sport driving. 3.6L Engine (LD Police) ? Erratic shifting or poor performance complaints while driving up steep hills, or at high altitude during hot ambient temperatures. ? Poor performance when driving aggressively. 5.7L Engine (LD/LX) ? Erratic shifting or poor performance complaints while driving up steep hills, towing, driving aggressively, or at high altitude during hot ambient temperatures. ? Poor shift quality (bump or torque disturbance) when coasting to a stop. ? Poor city fuel economy (AWD Only). ? Hanging in gear at high engine speeds during aggressive driving. ? Gear shift point enhancements during high load or race track driving. ? Excessive pedal needed to downshift in high altitudes (i.e. passing). ? Poor shift quality or high transmission temperatures during track or sport driving. ? Improved acceleration response from speeds greater than 36 Mph (58 Kph) (Japan Market Only). ? Bump sensation felt during deceleration or braking. 5.7L Engine (LD Daytona) ? Erratic shifting or poor performance complaints while driving up steep hills, towing, driving aggressively, or at high altitude during hot ambient temperatures.

Owners of these vehicles have filed 106 complaints in the transmission category.