2013 Chevrolet Malibu Electronic Stability Control Esc Service Brakes Engine Problems

WHILE DRIVING MY 2013 CHEVY MALIBU ON THE HIGHWAY & TURNPIKE, I WAS DRIVING APPROX 60-70 MILES AND HOUR AND THEN OUT OF NOWHERE THE VEHICLE DECREASED SPEED DOWN TO 30 MPH AND ALSO HAD ME CAUSE AN ACCIDENT WITH THE DRIVERS BEHIND ME. THE CHECK ENGINE LIGHT THEN CAME ON AND A MESSAGE "ENGINE POWER HAS BEEN REDUCED". I WAS ABLE TO PULL THE CAR OVER; HOWEVER, THIS IS A DANGER AND SHOULD BE RESOLVED AS STILL THIS CONTINUES TO OCCUR SINCE I HAVE CONTACTED GENERAL MOTORS AND ADVISED OF THE SAFETY ISSUE. STILL HAVE NOT SEEN A RECALL ON THIS ISSUE YET WHICH I WAS SHOCKED. I ASKED THE GENTLEMAN IF THERE HAVE BEEN OTHER COMPLAINTS AND HE STATED YES. SO I AM VERY SHOCKED THAT THIS ISSUE HAS NOT BEEN RESOLVED. MY VEHICLE NOW IS OUT OF WARRANTY AND STILL MECHANICS DO NOT KNOW WHAT IS WRONG AND CAN NOT FIX THIS ISSUE. I DO NOT FEEL THAT I HAVE TO PAY FOR PARTS THAT THIS VEHICLE DOES NOT WHILE THEY TRY TO PINPOINT THE PROBLEM. LITERALLY THE MECHANIC AT DAY CHEVROLET DURING THE DIAGNOSTIC JUST SAID TO LETS START SOMEWHERE AND SEE IF THAT RESOLVES THE ISSUE. I DON'T BELIEVE I SHOULD HAVE TO PAY FOR PARTS THAT MAY OR MAY NOT RESOLVE THE ISSUE. SINCE THEN I NOW HAVE MORE LIGHTS POPPING UP REGARDING TRACTION STABILITY, PARKING BREAK (WHICH WAS REPLACED AND DID NOT FIX THE ISSUE) TRACK CONTROL, ETC HAVE COME UP AND SEEMS TO HAVE DISABLED MY ANTI-LOCK BRAKES. COULD SOMEONE PLEAS CONTACT ME IF THERE IS A SOLUTION FOR THIS IF SOMEONE IS AWARE OF WHAT PART OR PARTS WILL FIX THIS DEFECT.