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Hey all, I've been experiencing transmission issues with my 2012 C63 (with 105,000 miles).
To be blunt, it's slipping in higher gears (4th - 7th only). I recently took a 1500 mile round trip to CO and the behavior got worse. What happens is when throttle is increased (moderately to aggressively) the engine speed will jump a few hundred rpm, before going back down to where it "should" be. This also happens when downshifting for a pass, i.e. shift from 5th to 4th and mat the throttle. Engine speed will stay a little elevated, then settle down to where it should be (with a direct relation to vehicle speed). In other words it briefly acts like a CVT.
The car is throwing no codes, there are no smells, there are no leaks. Vehicle mpg is same as always (which is to say better than EPA ratings at high speed cruising). As to transmission service history, approximately 2 years ago I had it flushed and the shop screwed up and underfilled it. Naturally I didn't know at the time, but the transmission wasn't shifting "quite right" so I took it to another shop within the month (and less than 500 miles driven) where it was confirmed (via another service) that the transmission had been around 2 quarts low. 2nd shop (Benz specialist) assured me that no damage had occurred from the underfill. STILL, given the current situation it makes me wonder.
I've never abused the car, though I have tracked 3 weekends (none in last 3 years). However I am the 8th owner of this car (crazy) so who knows the driving behavior of previous owners. I just made an appointment to have the car looked at. Unfortunately shop is busy so that won't happen until September 3rd. Not a huge deal as it's not my daily driver. But it is a bit of a bummer since the car is only driven 6 months a year (long winters). The shop that will be looking at it is a German specialist, however they prefaced the appointment by stating that if something internal is amiss they won't touch it and will refer me to a dealership. The nearest Benz dealership is 140 miles away so that's another issue...for another day. If I get to that bridge I'll cross it.
You guys have any advice or insight? Thanks in advance.
In my experience with manual transmissions, not apples to apples of course, when the clutch slips under high load (high gear, lower rpm, throttle application), that's usually a sign of worn clutches or pressure plates. I'm not intimately familiar with the design of the MCT, but I do know it's a multiple disc wet clutch like a motorcycle, so the comparison has some validity.
With that amount of miles, and an unknown history before you owned it, hard to say what the story is.
Hopefully it's something simple and not a rebuild of the transmission.
Finally got car into shop yesterday. Should get some answers today. I will update this post with what is discovered, to increase everyone's base of knowledge.
Sorry to revive an old thread, but I feel your issue remains open with no update.
A month ago, I had my transmission fluid change done at an Indi shop ( 2013 C63 P31 ), and as soon as I drove the car home, I had the transmission mis-behaving at low gears. Immediately pulled over and towed it back to shop.
They get back to me after scanning and tell me they need a new Repair Kit ( Part A 000 270 26 00 ). Okay.. not available but I personally managed to source one from an Authorized dealer in Dubai ( A 000 270 26 00 80 )
He tells me that's not the correct part for the C63 AMG and that he needs the same part ( from 2012 with the letter "S" on it... which I cannot find because it's old and out of production and probably not made anymore). This lead to me to believe that not only did he mess up the fluid change, he hasn't got the latest software to code the new part to my transmission. Along with the possibility that he doesn't know what he's talking about.
And now I have decided to take the car to the MB dealer and explain to them exactly what happened and hope they cooperate and genuinely diagnose and find out what is wrong. I am hoping best case scenario.. nothing wrong with part, just a proper fluid change and programming. Or medium case scenario, the part I supplied is correct and they can replace it for me ( because they don't have it in stock ).
Worse case scenario, they tell me it's much worse than that.
For your issue and what to do, honestly I don't know. But, your thoughts on going to the dealership seem like the best available option.
As to my issues, the shop found nothing wrong mechanically. (Which is good!). Did a full transmission service and no metallic bits were found in the filter or in the pan. The mechanic suspects its a software issue and I tend to agree. The most repeatable issue I suffer is a rough downshift from 4th to 3rd (way off on rev matching). However that only happens in manual mode. In Sport and Sport + it performs that action flawlessly. I haven't done anything about looking into a software/tuning fix at this point. The car was parked from November to April (for winter).
Had a meeting with the exclusive MB authorized dealer and they were very understanding.
They said as long as the car wasn't driven, the chances of any mechanical damage is unlikely, and that most probably the fluid change wasn't done properly and is probably low/high on fluid.
The chances that the conductor plate/part in question is fine, it's just that the Indi shop does not have the latest software to code the new updated part to the VIN.
The car is at the dealer now, so fingers crossed I hear some good news. Because the car is in such an immaculate condition with only 20k miles on the clock. And until today, it has a perfect service record there.
Stupid mistake by me and I hope I don't live to regret it.
From: Land of mountains, cheese, chocolate and watches
12' W204 C63 AMG coupe "T-Rex", 12' W451 Smart Fortwo Pulse (99' W202 C43 AMG + Ultima Can-Am sold)
Originally Posted by Ahmed
Had a meeting with the exclusive MB authorized dealer and they were very understanding.
They said as long as the car wasn't driven, the chances of any mechanical damage is unlikely, and that most probably the fluid change wasn't done properly and is probably low/high on fluid.
The chances that the conductor plate/part in question is fine, it's just that the Indi shop does not have the latest software to code the new updated part to the VIN.
The car is at the dealer now, so fingers crossed I hear some good news. Because the car is in such an immaculate condition with only 20k miles on the clock. And until today, it has a perfect service record there.
Stupid mistake by me and I hope I don't live to regret it.
Fingers crossed, but I'm sure everything will be good again
The MB dealer performed a fluid change, no luck. They recommend changing the transmission at a cost of 17k.
What I am proposing is that I give them the conductor plate and have them install it and check one more time. If that doesn't work, I may need to find an alternative solution ( used transmission or repair if possible )
The dealer did send me this video before doing another oil change.
I wasn't optimistic at first, but was hoping the indi shop did not clean the pan... but if they did and this happened in a matter of a few miles... I should be worried.
Looking at that, and assuming the indi shop had not cleaned out the pan, would this be normal?
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MCT 7sp transmission issues
