NHTSA Complaint #10936655 — 2014 GMC SIERRA 1500

STEERING WHEEL SPRINGS/SNAPS (HARD) IN THE OPPOSITE DIRECTION THAT THE WHEEL IS BEING TURNED AND STEERING CONTROL IS LOST. WHEN THIS DOES NOT SHUT THE ENGINE OFF, THE ONLY WAY TO REGAIN STEERING CONTROL IS TO RESTART THE VEHICLE. WHEN THIS DOES CAUSE THE ENGINE TO SHUT OFF THE STEERING IS RESTORED WITH THE RESTART. THE STABILI TRAK INDICATOR APPEARS JUST FOR AN INSTANT ON THE DIC WHEN THIS HAPPENS. NOTE: THIS IS NOT THE 'SERVICE STABILI TRAK' INDICATOR BUT MORE LIKE STABILI TRAK HAS BEEN ACTIVATED INDICATOR. THIS HAPPENED FIRST IN REVERSE WHILE BACKING INTO A PARKING SPOT. (THREE TIMES IN REVERSE). THEN IT STARTED HAPPENING IN DRIVE, TWICE WHILE PULLING OUT FROM A STOP SIGN AND ONCE WHILE DOING 15-20 MPH TURNING ONTO A SIDE STREET. THE 15-20 MPH TURNING INSTANCE CAUSED THE ENGINE TO SHUT OFF, STEERING BECAME NON EXISTENT FOR AN INSTANT AND THEN VERY VERY HEAVY. I CROSSED THE OTHER LANE OF TRAFFIC AND ALMOST LANDED IN THE DITCH. THE TRUCK HAS BEEN AT THE DEALERSHIP TWICE FOR A TOTAL OF 14 DAYS, BOTH TIMES 'CANNOT DUPLICATE' WAS THE RESULT. NO CODES ARE BEING GENERATED FROM THESE INSTANCES. CAUSE IS UNKNOWN. LOOSE VOLTAGE OR HIGH RESISTANCE TO GROUNDS MAYBE. THIS HAS HAPPENED IN HOT AND COLD WEATHER, RUNNING AC OR HEATER OR NEITHER. THERE IS NO PATTERN. PLEASE HELP.