InVA

I have had my new 2011 C300 for just over a month and I am wondering if anybody else has noticed this problem. When I turn the engine on and move from P to D and accelerate, the transmission shifts speed but the shift is very abrupt. The shift happens almost instantly after the car starts moving. My previous 2007 C230 did not have this problem and I am not sure if there is something wrong or if I just have to get use to it.
I have the car set in the Economical mode instead of the Sport mode and I don't have any more problems afterwards with the speed shifting, the abrupt shift is only the first shift. Thank you for your comments.

AMGTTV8

yeah well put it in sport since it's shifting down to first...since you must be putting a fair amount of throttle down when accelerating, the car deems that first gear is more appropriate than second for that type of wanted acceleration.

rmfnla

"Christian, American, Republican, Pro-Gun, Conservative, H&K freak."

Ah, an Obama fan!

InVA

In politics I am more aligned with WWMIndy.

Thank for the suggestion.

rmfnla

Welcome to the forum!

InVA

Going back to my original question. The reason I asked this question is that the abrupt speed shift happens at a very low rate of speed and it happens almost immediately as the car starts moving. The abrupt speed shift happens without hitting the accelarator very hard, I started to notice it because I have to drive slow getting out of the garage.

rmfnla

Sounds to me like your transmission is having an issue.

Have you shown it to the dealer?

InVA

At this point I am not even sure if this is a problem and I have not taken it to the dealer, I was hoping that someone else that has a 2011 C300 could comment on it.

saucemang

must be the 2011 only, my c300 also does what you are describing. (reverse to drive and park to drive)

SoCal208

Your car is new, why worry ?. Anything is NOT normal, take it to your dealer, describe the problems, have the dealer sort it out, That's warranty for. Good luck.

kjb55

If memory serves right, there was a TSB issued that acknowledged this 1st shift anomaly when the car is cold. It's normal after that 1st shift, correct?

I believe what you're describing is exactly what my 2010 does, but it's only the first cold shift. I'll research again and advise.

InVA

Yes, the abrupt shifting only happens when the car is cold. I am glad to hear that I am not the only one with this issue. Thanks.

kjb55

I think this is what you're describing.... (1st attachment)

The problem that I recalled was in the 2 to 3 shift (slip) when cold, and only once. That's in the second attachment.

sinister55

IDK if the regular C's have a C/S/M mode, but if it starts up in second gear and you floor it, it downshifts to first, the problem is the first gear ratio is higher and your torque converter has to converter your torque into horsepower, and adjusts to the down shifrted gear WHILE accelerating

kjb55

W204s have 722.9 trans (7 speed). The optional package 315 Dynamic handling offers C/S/M functionality, but in C the car starts in 1st. Unlike our C55s with 722.6 trans that starts in 2nd.

sinister55

I forgot about the 7 speed thing

I thought they also started in 2nd when in comfy mode lol

Man i got to keep up with technology

VAMBFAN

I've got a 2011 4Matic and the transmission (when S mode is selected) actually does the opposite - rather than shifting abruptly, it gives the feeling of slipping the clutch as if it was a manual transmission. The RPMs rev up then it changes the gear.

sinister55

Thats not normal