2017 GMC Sierra 1500 Power Train

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.

TOWING A 5900# RV TRAILER WITHIN THE SPECIFIED 7600# TOW WEIGHT CAPACITY, CAUSED THE TRANSMISSION TO OVERHEAT AND FREE SPIN WITHIN 10 MILES OF TRAVEL. TRANSMISSION OVERHEATING OCCURRED WHEN TOWING (285+), WHEN NOT TOWING BUT IN TOW MODE (264), & WHEN DRIVING (241). DEALER AND GMC TECH'S DO NOT HAVE A CORRECTION FOR THE TRANSMISSION OPERATING ABOVE RANGE. V6 ENGINE W 6 SPEED AUTOMATIC TRANSMISSION. TRAVELING AT 60MPH. WEATHER TEMPERATURE LOW 80'S. LEAVING THE OWNER IN THE ROAD WITH THEIR RV WAITING FOR 20 MINUTES FOR THE TRANSMISSION TO COOL DOWN SO IT CAN BE MOVED OFF THE ROAD, IS NOT SAFE.

THIS TRUCK IS A 3500 HD. I WAS PULLING A CAMPER ON A 1100 MILE TRIP. WITH 50 MILES LEFT I NOTICED THAT THE TRUCK WAS LEAKING TRANSMISSION FLUID FROM UNDER THE TRANSMISSION COOLER. UPON FURTHER INVESTIGATION I FOUND THAT THE RETURN HOSE FROM THE TRANS COOLER WAS POSITIONED SO THE IT RUBBED ON A FRAME COMPONENT WHICH CAUSED A HOLE TO RUB IN THE ALUMINUM TRANS COOLANT RETURN LINE. I NOTICED THIS WHEN THE TRUCK WAS PARKED RUNNING AT A REST AREA FOR AN HOUR BUT IT WAS OBVIOUSLY AN ONGOING ISSUE. HAD I NOT NOTICED IT WHEN I DID THIS CONDITION COULD HAVE CAUSED CATASTROPHIC FAILURE OF THE TRANSMISSION. THE DEALER SAYS THERE IS NO RECALL AND IT IS NOT UNDER WARRANTY. I CONSIDER THIS TO BE A SERIOUS DESIGN FLAW AND A MAJOR SAFETY ISSUE. I WAS ABLE TO GET TO MY DELIVERY STOP AND GET THE LINE PATCHED. IT IS AT THE DEALER FOR REPAIRS RIGHT NOW.

WHEN DRIVING AT SLOW PARKING LOT SPEEDS OR WHEN COMING TO A COMPLETE STOP THE VEHICLE INTERMITTENTLY LUNGES, SURGES OR JOLTS, CAUSING THE VEHICLE TO MOVE FORWARD OR BACKWARDS UNANTICIPATED. SOMETIMES THE JOLT FEELS LIKE ANOTHER VEHICLE HAS HIT THIS VEHICLE FROM THE REAR, AGAIN CAUSING IT TO LUNGE FORWARD.

UNINTENDED ACCELERATION WHEN SLOWING DOWN TO COME TO A STOP THE VEHICLE WILL OCCASIONALLY ENGAGE A LOWER GEAR VERY SUDDENLY AND LURCH FORWARD. THE RESULTING FORCE IS ENOUGH TO OVERPOWER THE BRAKING EFFORT BEING PROVIDED BY THE DRIVER AND THE VEHICLE WILL MOVE FORWARD SEVERAL FEET BEFORE THE DRIVER CAN REACT AND APPLY MORE BRAKING FORCE TO STOP THE VEHICLE. THE ISSUE OCCURS RANDOMLY AND INFREQUENTLY AT VERY SLOW SPEEDS (5-10MPH). THERE HAVE BEEN SEVERAL OCCASIONS WHERE IVE BEEN BRAKING TO STOP AT A STOP LIGHT AND BEEN FORCED INTO THE MIDDLE OF AN INTERSECTION. IM CONCERNED THE ISSUE COULD CAUSE THE VEHICLE TO STRIKE THE CAR IN FRONT OF IT OR A PEDESTRIAN CROSSING IN FRONT OF THE VEHICLE AS IT STOPS FOR A CROSSWALK. MULTIPLE UNSUCCESSFUL REPAIR ATTEMPTS HAVE BEEN MADE BY THE DEALER. I ATTEMPTED TO FORCE THE MANUFACTURER TO BUY THE VEHICLE BACK FROM ME THROUGH THE MASSACHUSETTS LEMON LAW AND SINCE THAT TIME THEY HAVE DENIED THE EXISTENCE OF A PROBLEM. I HAVE SEEN SEVERAL INSTANCES ONLINE WHERE CONSUMERS WITH THE IDENTICAL VEHICLE (ALL WITH THE 8 SPEED TRANSMISSION) COMPLAINED OF THE SAME PROBLEM.

TL* THE CONTACT OWNS A 2017 GMC SIERRA. WHILE DRIVING APPROXIMATELY 5 MPH, THE VEHICLE FAILED TO SHIFT OUT OF GEAR AND THERE WAS A DELAY OF THREE TO FOUR SECONDS BEFORE SHIFTING INTO SECOND GEAR. THE FAILURE RECURRED EVERY MORNING. THE VEHICLE WAS TAKEN TO THE DEALER (JIM CAUSLEY, LOCATED AT 38111 GRATIOT AVE, CLINTON TOWNSHIP, MI 48036) WHERE IT WAS CONFIRMED THAT GM WAS AWARE OF THE ISSUE. THE VEHICLE WAS NOT DIAGNOSED OR REPAIRED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE AND INFORMED THE CONTACT THAT THERE WAS NO RECALL ON HIS VIN. NO FURTHER ASSISTANCE WAS OFFERED. THE APPROXIMATE FAILURE MILEAGE WAS 4,500. UPDATED 11/13/17 *BF *TR

TL* THE CONTACT OWNS A 2017 GMC SIERRA 1500. WHILE DRIVING 30 MPH, THE TRANSMISSION FAILED AFTER A COMPLETE STOP. WHEN THE ACCELERATOR PEDAL WAS DEPRESSED, THE RPMS INCREASED. WHEN SHIFTING FROM SECOND TO FIRST GEAR, THE TRANSMISSION SHIFTED INTO FIRST GEAR WITH EXTREME FORCE AND CAUSED THE VEHICLE TO ABRUPTLY ACCELERATE. THE CONTACT HAD TO ENGAGE THE BRAKE PEDAL WITH FORCE TO AVOID A CRASH. THE FAILURE WAS EXPERIENCED NUMEROUS TIMES. THE VEHICLE WAS TAKEN TO WALSH CHEVY BUICK GMC (2330 NORTH BLOOMINGTON STREET, STREATOR, IL, 61364 815-673-4333) WHERE THE TRANSMISSION SYSTEM WAS REPROGRAMMED TWICE AND THE ELECTRONIC CONTROL MODULE WAS REPLACED. HOWEVER, THE FAILURE WAS NOT CORRECTED. THE MANUFACTURER WAS NOTIFIED. THE FAILURE MILEAGE WAS 112. UPDATED 08/30/17*LJ *CN