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)).
