NHTSA Complaint #10910936 — 2016 GMC CANYON

I BOUGHT A BRAND NEW 2016 CANYON, TEST DRIVE WENT WELL, ALTHOUGH I ADMIT IT PROBABLY WASN'T LONG ENOUGH. PURCHASED ON SUNDAY, AND DURING THE NEXT WEEK DRIVING I BEGAN NOTICING THE TRANSMISSION WAS NOT SHIFTING AT THE PROPER TIMES. LIKE MOST PEOPLE ON HERE, THE TRANSMISSION APPEARS TO BE VERY CONFUSED , ESPECIALLY WHEN DECELERATING INTO THE 20-35 MPG RANGE AND ATTEMPTING TO RE-ACCELERATE BACK UP. IT WILL MISFIRE OR BE VERY UNRESPONSIVE, AND THEN CLUNK AND JERK YOU FORWARD ONCE IT DECIDES TO CHANGE GEARS. IT ALSO DOES SOMETHING THAT I THINK IS EVEN MORE DANGEROUS WHEN YOU ARE GOING AROUND 30-40 MPG AND THEN SIMPLY LET OFF THE ACCELERATOR. IN THIS INSTANCE, I FEEL LIKE IT DOWN SHIFTS INSTANTLY AND IT FEELS LIKE THE TRUCK IS BEING PULLED BACK (INSTEAD OF SIMPLY COASTING LIKE I WOULD WANT), AND THEN AT SOME POINT IT "RELEASES" FROM THIS AND THE TRUCK ACTUALLY STOPS DECELERATING AND SPEEDS UP A BIT, EVEN THOUGH THE GAS HAD BEEN RELEASED MANY SECONDS AGO. THIS IS PARTICULARLY DANGEROUS IN STOP AND GO CITY TRAFFIC. I THINK THE OVERARCHING PROBLEM HERE IS THE SHIFT POINTS THAT THE ECM HAS DETERMINED (OR BEEN PROGRAMMED WITH). YOU CAN TELL THIS WHEN ACCELERATING FROM A STOP, MY TRUCK GETS TO THIRD GEAR BY 15 MILES PER HOUR AND NEVER GOES ABOVE 2K RPM'S??? I ADMIT I AM A BIT LIGHT-FOOTED ON DRIVING, WHICH COMPOUNDS THE PROBLEM BECAUSE I EVENTUALLY AM GIVING A SMALL AMOUNT OF ACCELERATION TO A TRUCK IN 4TH GEAR ONLY GOING 20 MPH, WHICH SUCK. I HAVE ALSO READ THIS WAS A COMMON PROBLEM ON 15 CANYON (OBVIOUSLY READ AFTER PURCHASE), AND GMC EVENTUALLY CAME OUT WITH A FEW FIXES, INCLUDING ECM PATCH UPDATES OR LOWER VALVE REPLACEMENT. I IMAGINE THAT MANY OF THE 2016'S WERE ALREADY OFF THE LINE BY THE TIME THESE '15 FIXES CAME OUT (IN APRIL 15 I BELIEVE), BUT THE DEALERSHIPS HAVE NOT RECEIVED ANY OF THESE FOR THE 2016.