THIS BULLETIN ANNOUNCES AVAILABILITY OF REPROGRAMMING FILES FOR OPTIMIZING THE TRANSMISSION CONTROL MODULE (TCM) ON ALL 2015 AND SOME EARLY-PRODUCTION 2016MY VEHICLES TO CONTROL AN ENGINE IDLE SPEED FLUCTUATION CONDITION WHEN IN PARK OR NEUTRAL. THE CAUSE IS INCORRECT OPERATION OF A BACK-UP PROGRAM THE TCM USES IN THE EVENT OF A TURBINE SPEED SENSOR PROBLEM. AFFECTED VEHICLES MAY SEE A FLUCTUATION OF APPROXIMATELY 200 RPM (BETWEEN 600 – 800 RPM IDLE SPEED).
