Flash: Drone or Vibration Present During MDS Operation This bulletin involves selectively erasing and...

Bulletin number

18-050-14 REV. A

Component

Power train: automatic transmission: control module (TCM/PCM/tecm)

Summary

Flash: Drone or Vibration Present During MDS Operation This bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software. New PCM software is being released to address a customer's concern of a drone or vibration type condition while driving at highway speeds during MDS (Multiple Displacement System) operation.In addition, the following powertrain system improvements/enhancements are also included in this software release: Improved Electronic Voltage Regulator control to more precisely maintain system voltage. Enhanced Automatic Oil Change Indicator(EAOCI) system improvements to switch to a severe duty cycle algorithm anytime the PCM is replaced to ensure the customer receives a timely oil change required message. (Only applies to vehicles using a block heater in ambient temperatures greater than -20°F(-29°C)).

Owners of these vehicles have filed 583 complaints in the transmission category.