TSB Document:

Affected Component: ELECTRICAL SYSTEM

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)).

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Date Published
DEC 09, 2014
NHTSA TSB #
10221054
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