Owners/service Manual Problems of Mercedes Benz GL550

I was driving freeway 5n (12/20/12) about 200 miles n of la with my distronic plus set for 79 mph when the distronic quit causing the car to suddenly decelerate and without any warning. A car that was following (too) closely had to brake to avoid hitting me. I received 3 error messages saying distronic plus inoperative, active lane keeping assist inoperative and active blind spot assist inoperative. My manual has error messages than can occur but did not show the error messages I received on the dash read-out. On 1/9/13 the distronic failed again in the same way with the same messages. I took the car to mercedes on 1/17/13 for inspection. The dealer found "no related fault codes present". I have asked mercedes repeatedly if this is supposed to happen and they will not answer my question. And they have not answered why my error messages are not shown anywhere in their manuals. On a test drive with a service tech on 3/21/13 the distronic failed to brake the vehicle when the vehicle came upon a parked car and also a car in the driving lane. This happened 5 times. The service tech supervisor drove the car and had the exact experience. On April 4, 2013 I had an appointment to have my car driven by a factory rep. The mercedes factory technical specialist and the penske shop supervisor drove and tested my car several times. The vehicle did not stop or sound a tone when coming up on stopped vehicles or cars in the driving lane when the distronic plus was activated which is not how it is designed to work. Not knowing the cause the mb fst noted on my work order of April 4, 2013: 5442 mb fts to review. I have not heard back from mercedes on these issues other than a buy back offer that states that my claims are "doubtful" which is simply not true. Their response is irresponsible and insulting. I want my car fixed so it is safe to drive.

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