jerome8283

When braking abruptly just before coming to a complete stop I feel a jolting sensation. It feels like another car hit me from behind. I will conduct more tests tomorrow. Has anyone experienced this?

K-A

Sounds like a classic 7G Tronic (Transmission) problem. My W211 did this very annoyingly, and my W212's have been much better, with the occasional little "hiccup" in "S" Mode.

Is the car brand new? I've found that within the first 1,000 or so miles, they tend to jolt/hiccup a lot while learning your driving style, then smooth out.

jerome8283

Tell me about it, my W211 did the same thing too but with it I could simply apply the brakes gently at any speed and feel the same jolt. Now this happens with my W212 when coming to an abrupt stop at a higher speed.

The car is a 2010 with about 15k miles on it.

K-A

Yeah, take it in. Just hope that it "performs" when the Tech is driving it. With my W211, I had to bring it in numerous times before they finally felt it, and did a Valve Body change (which almost fixed it).

ImInPA

Sounds like it might be the torque converter locking and unlocking. Depending on RPM and many other factors, virtually all lockup torque converters can exhibit this behavior. Sucks, but, they get better gas mileage. IF it is excessive, I would have the dealer check it out. I notice it with my Bluetec too (400 lb/ft ) but it is no worse than other cars I have driven. With mine, it is not everytime, but just occasionally.

E550Shopper

Have the same problem on my W211 and now on my W212 as well. The W211 was a 5G as well, so it's not limited to the 7G's. This "feature" is probably worse on my W212 -- on the W211, I was at least able to modify my driving style to control it. I'll probably have the dealer take a look first time I bring it in for service. Not a big enough deal yet to take it in. Kind of amazing that MB can't figure out how to make a smooth transmission for these cars; even more amazing that they've put out at least FOUR YEARS worth of cars that have these problems.

ghstudio

Coming from a 2011 Infiniti M37, I can assure you that the Mercedes is silky smooth in comparision. If you have the urge to complain about the w212 transmission, drop by and drive an M37.

CynCarvin32

7g bump. A valve body may fix it but the reality is that all the 2010 and 2011 E350s have the latest version of the valve body so changing it assumes its defective. Chances are its not defective.

My car does it, evert 7g I drive does it. Some are a bit worse but thats mass production cars with electronically controlled shift programs.

With that said my latest 350 was an absolute disaster when I picked it up from the vpc center with 5 miles on it. The car slammed every shift like it was about to explode. As I drove it things smoothed out but clearly the factory forgot to adapt the trans correctly. I took it in after 3k miles and had it re-adapted and it got much better.

I personally hate the shift logic on the new cars. Its the Obama EPA tune and it rushes to the highest gear as quickly as possible and refuses to hold a gear even with your foot mashed into the carpet. There should be a button that allows the car to be driving the way you want and not the way the EPA wants for max MPG.

Half the time its lugging along at 2.5k at 3/4 throttle input and that makes zero sense.

ImInPA

LOL. So, Mercedes hired Obama to do their tranny tunes? How does he find the time to fix all the problems caused by the prior administration and tune transmissions for MB. He is far more amazing than anyone gives him credit for being. I wonder if he is also responsible for the dash rattles reported by some owners.

mb4z

Just drove another M37. Honestly most things are subjective and frequently are dependent on what you are currently driving and hence what you are accustomed to.
Also drove a totally loaded M56 sport. Well was I surprised. I thought the sport would have a harsh ride and uncomfortable seats. Wrong on both accounts. Ride was great and had no complaints about seats. The trans on all of them I drove shifted like buttah. Go figure. Now leaning towards an M56S or 550. Lease is up in 4 months on my M so I have some time to think about it.

K-A

I swear, there isn't one article I read these days which states a problem that Obama doesn't get blamed for in the Comments sections (I read them just to find the Obama blames.... A Movie tanked in the Box Office? Obama! A little girl gets kidnapped? Obama! Food poisoning? Obama! Gang activity? Obama! The Pontiac Aztec is so ugly? Obaaaaamaaaa!!!!.

csquared

My 2011 E550 has the same "jolting" issue as described above. Had the dealer check the car and said there's no problem. I already had the multicontour seat's pump replaced. Man, Mercedes is very unrealiable or mines just poorly made. I've driven my 2003 X5 for 7 years and only had to change the front and rear lightbulbs. Everytime I start the engine and drive the car a few meters there's a bit of jolting in the transmission as if the 1st and 2nd gear are disconnected. I'm shocked to say that my 7 year old X5 runs smoother than the Mercedes in the transmission department. It eats more gas but that's because the RPM is always between 2500-3000, the E550 never goes past 2000 RPM unless really pushed in sport mode.

hyperion667

haha, the aztec is hideous, but a closer second runner up is the new Juke from Nissan

ghstudio

Take the M for a drive on an interstate....from about 55-60, put your foot down to pass someone (make the car downshift). Unless they changed the 2012's, you will not like the results. The transmission is smooth driving in normal traffic, it's when you force a downshift that drove me nuts. (sport mode masks the problem...test drive in the normal shift mode).

pappilo

I like the Juke