2018 Mercedes-Benz E-Class Speed Control & Cruise Problems

THE VEHICLE WAS IN MOTION TRAVELING AT 35 MPH AND CONTROLLED BY ADAPTIVE CRUISE CONTROL SET AT 35 MPH. THE TIME WAS 12:40 PM ET ON 29 MARCH 2019. SEEMINGLY THE CAR WENT INTO CRASH PREVENTION MODE BY TIGHTENING THE SEAT BELT AND EXECUTING A MAXIMUM FORCE BRAKING STOP. THE TIRES SQUEALED. MY CHEST WAS SORE WHERE THE SEAT BELT RETRACTED WITH FORCE. APPROXIMATE LOCATION: SOUTHBOUND ON LANDMARK DR. NEAR ASHCROFT CT. CLEARWATER, FL 33761. LANDMARK DR. IS A RESIDENTIAL TWO LANE ROAD RUNNING NORTH-SOUTH WITH DUAL YELLOW PAINTED CENTER MARKING. ROAD IS STRAIGHT AND FLAT FOR APPROXIMATELY .2 MILE IN EACH DIRECTION. THERE WERE NO OTHER VEHICLES, PEDESTRIANS OR ANIMALS WITHIN SIGHT IN EITHER DIRECTION. WEATHER WAS SUNNY AND DRY WITH THE TEMPERATURE NEAR 82F.

RECENTLY PURCHASED A 2018 MERCEDES-BENZ E400 4MATIC WAGON WITH PREMIUM PACKAGE 3 THAT INCLUDES ALL OF THE AVAILABLE DRIVER ASSISTANCE PROGRAMS (SEMI AUTONOMOUS STEERING, ADAPTIVE CRUISE CONTROL, LANE KEEP ASSISTANCE, BLINDSPOT DETECTION, AUTOMATIC PARKING ASSIST, CROSS TRAFFIC ALERT). ACCORDING TO MERCEDES, THE PROGRAM TITLED DRIVE PILOT WITH STEER ASSIST, IS ABLE TO KEEP THE VEHICLE IN THE LANE WHEN THERE ARE LANE MARKINGS OR EVEN FOLLOW A CAR AHEAD IF THERE ARE NO LANE MARKINGS. WELL, THIS SYSTEM IS TERRIBLE. IT CAN'T STAY CENTERED IN THE LANE, INSTEAD IT FEELS LIKE YOU'RE PLAYING A GAME OF PONG GOING BACK AND FORTH BETWEEN THE LANE MARKERS. THAT IS, WHEN IT WORKS. WHEN IT DOESN'T WORK (MOST OF THE TIME), YOU WILL BE GOING DOWN THE ROAD AND IT SUDDENLY STARTS DRIFTING OUT OF THE LANE TO FOLLOW THE CURVE OF AN OFF RAMP OR IT SUDDENLY DISABLES ITSELF BECAUSE IT CAN'T FIGURE OUT WHERE THE LANE MARKINGS ARE. THERE'S NO AUDIBLE WARNING OR BIG VISUAL CUE THE STEER ASSIST HAS ENDED, JUST A TINY LITTLE STEERING WHEEL ICON IN THE HEAD UP DISPLAY TURNS FROM GREEN TO GRAY. MERCEDES ADVERTISED THIS SYSTEM TO BE BETTER THAN OR AT LEAST ON PAR WITH TESLA'S AUTOPILOT, YET IT CAN'T READ STOP LIGHTS, CAN'T EVEN STAY IN WELL MARKED LANES AND COMBINED WITH THE ADAPTIVE CRUISE CONTROL THAT HAS NO WAY OF CHANGING HOW QUICKLY IT ACCELERATES, FEELS LIKE THE CAR IS OUT OF CONTROL. WHAT I FIND EVEN MORE DISAPPOINTING IS THAT THE MERCEDES APPARENTLY WILL NOT BE GIVEN SOFTWARE UPDATES TO IMPROVE THE SYSTEM UNLIKE TESLA WHO IS CONSTANTLY PROVIDING THEIR VEHICLES WITH OVER THE AIR UPDATES. IF MERCEDES CAN'T DO OTA UPDATES FINE, BUT THEY MUST UPDATE THESE CARS ARE THE DEALERS. I FEEL LIKE THIS SYSTEM DESPERATELY NEEDS A SOFTWARE UPDATE TO BE EVEN MARGINALLY FUNCTIONAL. DEALER HAS NO CLUE ABOUT THESE ISSUES BECAUSE OUR CAR WAS ONE OF THE ONLY ONES ORDERED WITH ALL OF THE ASSISTANCE PROGRAMS.