Gm Global Technolgoy Operations, Inc.

David H Moiseev

Todd R Berger

David Chris Webert

Roberto Diaz

Dustin A Nygaard

Joseph V Pittiglio

A method for controlling internal electronic range selection for an automatic transmission includes: confirming if a range change command has been ordered from a current transmission operating state; verifying expected performance from at least first and second mode valves and a park servo are present in the current transmission operating state prior to allowing a range change event; during the range change event: generating proactive commands including ordering a reduction in a hydraulic system pressure; and identifying if an unexpected event is detected; and following completion of the range change event confirming expected performance is obtained from at least the first and second mode valves and the park servo to achieve a driver intended state.

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Huntington Woods, MI, United States of America

David H Moiseev