2007 Mercedes-Benz C-Class Speed Control & Cruise Problems

VEHICLE LOST SPEED ON HIGHWAY. ENGINE RACING BUT NO SPEED. PULLED OVER TO CALL FOR HELP. NO REVERSE. HAD CAR TOWED TO DEALERSHIP. REQUIRED REPLACEMENT OF TRANSMISSION ELECTRONIC CONTROL UNIT. COST WAS $1,352.83. DEALER TOLD ME IT IS A COMMON PROBLEM. THIS SOUNDS LIKE A SYSTEMIC PROBLEM WITH THIS PART AND CAN CAUSE INJURY OR DEATH IN CERTAIN DRIVING CONDITIONS. ...UPDATED 09/28/15 *BF UPDATED 3/29/2016*JS

WHILE DRIVING MY CAR ON SUNDAY (8 JUNE 2014), MY 2007 MERCEDES BENZ C230 LOST ACCELERATION AND THE CAR WOULDN'T GET OUT OF FIRST GEAR AND THE RPM'S WERE RUNNING HIGH. I HAD TO PULL OVER AND TURN THE CAR OFF HOPING TO RESET THE CAR TO THAT I COULD GET BACK HOME. ONCE I TURNED OFF THE CAR AND SET FOR A FEW MINUTES IT THEN WORKED WITH NO PROBLEM. THIS ISN'T THE FIRST TIME THIG HAS HAPPEN TO THE CAR. *JS

I WAS DRIVING MY CAR AROUND 30MPH COMING TO A SLOW DOWN TO MAKE A RIGHT HAND TURN. MADE TURN AND PROCEEDED UP A STEEP HILL AND MY CAR SIMPLY STOP PULLING/ACCELERATING. THIS HAS HAPPENED SEVERAL TIMES. I WENT OUT OF TOWN TO TX FOR CHRISTMAS AND HAD THE SAME THING HAPPEN. I CAN'T UNDERSTAND WHY SO MANY COMPLAINTS AND NO ONE HAS YET TO EVEN INVESTIGATE THE PROBLEM. THE MAINTENANCE ON THESE VEHICLES IS EXPENSIVE. ON TOP OF THE MB IS FAMILIAR WITH THIS ISSUE AND SHOULD NOT BE PUTTING THIS EXPENSE OFF ON THE OWNERS DUE TO FAULTY DEFAULT PRODUCT THAT CAN NOT EVEN BE REBUILT BUT REQUIRES REPLACING THE FAULTY PART WITH ANOTHER FAULTY PART. SOMETHING NEEDS TO BE DONE ABOUT THIS. *TR

I BOUGHT THE CAR JUNE 2011 AND SINCE THEN, I HAVE PERIODICALLY HAD THIS PROBLEM. FROM A STOP, THE CAR WILL NOT ACCELERATE. IT FEELS LIKE IT IS STUCK IN A HIGHER GEAR. OR, THE OPPOSITE HAPPENS. I WILL ACCELERATE, AND THE CAR WILL NOT CHANGE FROM SECOND TO THIRD GEAR. I HAVE TO PULL OVER AND RESTART THE ENGINE, AND THEN IT WORKS. I HAVE SEEN NUMEROUS COMPLAINTS ONLINE FROM OTHER OWNERS THAT THEY HAVE THE SAME PROBLEM. *TR

I PURCHASED MY 2007 MERCEDES C230 IN APPROXIMATELY FEBRUARY 2011 FROM CARMAX IN ROSEVILLE, CA. WITHIN SIX WEEKS, I WAS DRIVING ON A LOCAL FREEWAY WHEN I EXPERIENCED A LOSS OF ACCELERATION POWER YET THE ENGINE WAS RUNNING A OVER 4000 RPM. I RETURNED TO THE CARMAX DEALERSHIP TO REPORT THE ENGINE PROBLEM, BUT THE DEALERSHIP COULD NOT RECREATE THE PROBLEM, WHICH REPEATED ITSELF INTERMITTENTLY IN THE FOLLOWING MONTHS. IN DECEMBER 2011, I TOOK THE CAR TO A LOCAL MERCEDES SPECIALIST FOR A SERVICE B; UPON EXAMINATION, THE SPECIALIST ADVISED ME THAT THE CAR HAD NOT RECEIVED A 60,000 MILE SERVICE B, INCLUDING A TRANSMISSION SERVICE, AND ASKED IF THE CAR HAD EXHIBITED THE POWER LOSS AND HIGH RPM. THE SPECIALIST INFORMED ME THAT A MERCEDES SERVICE BULLETIN ADVISED OF AN INCOMPATIBILITY BETWEEN THE METAL MATERIAL OF THE TRANSMISSION AND THE ORIGINAL FACTORY FLUID, WHICH CAUSES A SHEARING PROBLEM AND BUILD UP ON THE TRANSMISSION SHIFTING SENSORS. THE SPECIALIST RECOMMENDED AND PERFORMED A SERVICE OF FLUSHING & REPLACEMENT OF THE TRANSMISSION FLUID WITH A NEWLY FORMULATED, MERCEDES RECOMMENDED FLUID. IMMEDIATELY FOLLOWING THE SERVICE AND FLUID REPLACEMENT, THERE WERE FEWER INCIDENTS OF POWER LOSS. IN RECENT WEEKS, SIX MONTHS AFTER THE TRANSMISSION SERVICE, THE ISSUE OF POWER LOSS HAS RE-OCCURRED FREQUENTLY, MULTIPLE TIMES PER WEEK, MULTIPLE TIMES PER DAY, MANY TIMES ON THE FREEWAY AT SPEEDS OF 55-65 MPH, REQUIRING ME TO PULL TO THE SHOULDER OF THE FREEWAY TO TURN OFF THE CAR AN ALLOW TO RESET BEFORE RE-ENTERING THE FLOW OF TRAFFIC. THIS LOSS OF POWER AND TRANSMISSION CONTROL WHILE DRIVING AT FREEWAY SPEED IS A GREAT SAFETY CONCERN TO ME. *TR

UNINTENDED ACCELERATION,THREE INSTANCES. *TR

UNINTENDED ACCELERATION WHILE BRAKE WAS ENGAGED. *TR