NHTSA Complaint #10966217 — 2015 GMC YUKON

VEHICLE DRIVE TRAIN OPERATES ERRATICALLY IN VARIOUS OPERATING SITUATIONS AND HAS EXTENSIVE VIBRATIONS BETWEEN 25-40MPH; VIBRATIONS ARE WORSE IN CERTAIN GEARS. SIGNIFICANT LUNGEING AND JERKING ON SHIFTING GEARS ON ACCELERATION PARTICULARLY WHEN NOT ACCELERATING INTENSELY. MOST CONCERNING: WHEN DECELERATING AFTER RUNNING AT HIGHWAY SPEEDS AND DOWNSHIFTING (I.E. EXIT RAMPS, HIGHWAY SERVICE/REST AREAS), VEHICLE ACCELERATES (AFTER DOWNSHIFTING) AND REQUIRES EXTENSIVE BRAKE PRESSURE TO SLOW AND CONTROL. TAKEN IN FOR SERVICE 3X AT 3 DIFFERENT GMC DEALERS. TRANSMISSION HAS BEEN REPROGRAMMED 2X. 3RD DEALER PROVIDED GMC TECHNICAL SERVICE BULLETIN "#99-04-20-002I: INFORMATION ON DRIVE TRAIN CLUNK NOISE - (NOV 18, 2014)" AND TOLD IT'S 'NORMAL OPERATION' AND IS DUE TO DRIVETRAIN 'LASH' (AKA GEAR SLOP OR PLAY). PAID $150 TO BE TOLD "CUSTOMER CONCERN NOT DUPLICATED AT THIS TIME". SIMPLY FIND THIS HARD TO BELIEVE AS THE OPERATIONS AS DESCRIBED ARE READILY APPARENT. IN ALL SERIOUSNESS: (1) THE SUDDEN JERKING/SLAMMING OF GEARS ON ACCELERATION HAS BEEN NOTICE BY SEVERAL PASSENGERS NOT JUST MYSELF, (2) THE ACCELERATION ON DOWNSHIFTING IS A HUGE LIABILITY AS THE INCREASED POSSIBILITY OF REAR END COLLISION IS SIGNIFICANT AND (3) NO WAY IS IT 'NORMAL' OPERATION.