9.1% of complaints about the 2017 GMC Sierra came in the first year, which is unremarkable for a 2017 vehicle — around the middle of the 203 model-years on record. The median complaint arrives at 2.8 yr in service. The most-reported system is power train (23 complaints), typically at 2.0 yr or about 10,000 miles.
VIBRATION 65+ MPH, FELT IN STEERING WHEEL AND SEAT. STEERING WHEELS QUIVERS AT 65+ MPH. TRUCK FEELS VERY UNSTABLE AT HIGHWAY SPEEDS. DEALER STATES IT'S NORMAL.
TRANSMISSION HARSH 1-2 SHIFT WHEN IT IS UNDER LIGHT THROTTLE AND SOMETIME DOES NOT SHIFT OR MAKE NOSE. GMC DEALER ARE AWARE ABOUT THIS ISSUES ON ALL GM TRUCK MODEL OF 2015 TO 2017 WITH 8SPED TRANSMISSION SINCE APRIL 2017. I HAVE ATTACHED DOCUMENTS GIVEN BY DEALER.
THE "CHEVY SAKE". AT SPEEDS OVER 70MPH EXCESSIVE VIBRATION INSIDE THE VEHICLE. THIS IS WELL DOCUMENTED ON-LINE, PARTICULARLY VARIOUS GM FORUMS AND YOU TUBE VIDEOS. IT IS MY UNDERSTANDING THAT GM DENIES IT IS A PROBLEM, BUT THEY HAVE BEEN DOING SOME BUY BACKS AND IF YOU READ SOME OF THE DEALER BLOGS IT IS EVIDENT THAT GM KNOWS IT IS A PROBLEM.
I ALMOST KILLED A KID TODAY PARKING FOR A BASEBALL GAME. I WAS TRAVELING SLOWLY AND PARKING WHEN MY BRAKES BECAME HARD TO PUSH AND FAILED. TRUCK WENT OVER CURB AND TOWARD KID PUTTING ON HIS CLEATS AND NOT FACING ME. I WAS ABLE TO PUSH AS HARD AS I COULD AND IT STOPPED. I BACKED UP AND BRAKES WORKED AGAIN. I HAVE 46,000 MILES ON THE TRUCK. I AM NOW AFRAID TO DRIVE IT, BUT IT SEEMS THEY ARE WORKING AGAIN. IF THIS IS COMMON, GMC NEEDS TO TAKE CARE OF THIS. SOMEONE WILL SOON BE HURT SERIOUSLY!