MY 2001 C320 FOR SOME REASON IS SHIFTING WEIRED. FOR EXAMPLE: I WILL BE GOING DOWN THE RAOD AND IT WILL SHIFT FINE AND WHEN I GET TO A STOP LIGHT AND GO AGAIN IT STAYS IN 4TH OR 5TH GEAR AND TAKES OFF REALLY SLOW. NOW WHEN I PULL OVER AND SHUT OFF THE CAR AND START IT AGAIN, IT WORKS FINE FOR A WEEK OR SO. AND ALSO FOR SOME REASON IT WANTS TO DOWN SHIFT ON ME TO.. SAY IM IN 5TH GEAR AND FOR SOME REASON IT SHIFTS DOWN TO 3RD AND WON'T GO OUT OF THE GEAR. I SHUT IT OFF AND START AGAIN AND ITS FINE. IT WON'T DO THIS IF IM SHIFTING IT MANUALLY, ONLY WHEN IM IN DRIVE DOES IT DO THIS EVERY ONCE IN A WHILE. WHAT IS YOUR OPINION? COULD IT BE A SENSOR GOING BAD OR A TRANSMISSION PROBLEM. ME PERSONALLY, I DON'T THINK ITS A TRANSMISSION PROBLEM BECAUSE IT ONLY HAS 69000 MILES ON IT. THANKS, TRAVIS

 

better get the dealer check it with computer. there must be a fault code stored in memory.

 

WENT TO MY MECHANIC AND THEY RAN IT THROUGH THE COMPUTER AND I HAVE A DEFECTIVE SPEED PLATE SENSOR IN MY TRANS, THANK GOD THATS ALL IT WAS AND THEIR IS NOTHING WRONG WITH THE TRANS.

 

I just bought a new 2006 C230 a couple weeks ago and I was experiencing the same problem... I took it in and they said it was related to the transmission and replaced the valve body/control unit. Bear in mind... I have less than 500 miles on my car and I am having transmission problems so I don't think the mileage matters much. It has been working fine ever since I picked it back up just last Tuesday.

But in any case you might want to check to see if the valve body/control unit is the problem. Now...this morning I had a puddle of transmission fluid under my car..so I am not sure if this is related to what they fixed or if this is a new problem....

Good luck,
Aimee