Transmission Shift Enhancements: This bulletin involves selectively erasing and reprogramming the...

Bulletin number

21-014-14

Component

Electrical system

Summary

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).3.6L Grand Cherokee/Durango Transmission shifting does not meet customers expectation while towing a loaded trailer in high ambients (>32°C/90°F). Poor performance and/or poor powertrain response when trying to accelerate from speeds >58 kph (36 mph) - All Markets. Poor performance and/or poor powertrain response when trying to accelerate from speeds >48 kph (30 mph) - Japan/Taiwan/China vehicles only. Transmission shifts inconsistently (gear hunting) when driving up/down steep hills or when towing a trailer.6.4L Grand Cherokee. Poor acceleration or performance above 113 kph (70 mph).Transmission shifting while accelerating from a stop does not meet customers expectation. Harsh shifting during acceleration with moderate accelerator pedal and then lifting off the accelerator pedal. Cannot accelerate up a steep incline or with a loaded trailer in reverse.3.6L Wrangler Transmission shifting does not meet customers expectation while towing a loaded trailer in high ambients (>32°C/90°F). Poor performance and/or poor powertrain response when trying to accelerate from speeds >48 kph (30 mph) - Japan/Taiwan/China vehicles only. Rubicon Only.2.8L Wrangler Transmission shifts inconsistently (gear hunting) when driving up/down steep hills or when towing a trailer. Delayed Drive to Reverse shift engagement when the transfer case is in Low Range (4LO) Transmission shifting while accelerating from a stop does not meet customers expectation. Poor vehicle performance in Drive Poor vehicle performance in Auto Stick Mode. Rubicon Only.3.6L Challenger Transmission shifting does not meet customers expectation while towing a loaded trailer in high ambients (>32°C/90°F).

Owners of these vehicles have filed 874 complaints in the electrical category.