2012 W204 C63 MCT Gearbox Issue
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Junior Member
Joined: Oct 2008
Posts: 33
Likes: 1
From: Cyprus
clk209
2012 W204 C63 MCT Gearbox Issue
Guys been having this issue with my transmission now for about 6 months. At slow speeds on normal driving i am expierancing gear slipage like the clutches are worn. anything under 4,000 rpm the needle bounces and then catches a gear. At high speed driving, at full throttle the car performs brilliantly with no slipage. After 5+ visits at Mercedes center they cannot find any faults, errors with the car.
Had it three times into the same dealer with no faulty codes and no errors. Updated and reseted adaptations and nothing changed. Now on Monday i took it to another Mercedes dealer, another franchise which they wanted to perform the gearbox service, filter, which i authrosied as my transsmisson service was last down 35k ago, and had the also replace the differential oil which i requested.
Had the car updated and adaptations reset and re taught the gears and the issue i am having is still there.
I have been informed now they can either remove the gearbox, inpsect and relpace any parts they might think are worn or order a brand new gearbox at a cost of 13,000 euro + fitting.
Can i get some advice from some one, as i never had this issue with my pre facilft C63. Has anyone expieranced this type of issue before and what was the problem as i searched high and low and not getting a clear answer by anyone. I am thinking maybe there is a solinoid fault ??? I am tired of no one able to fix me car.
Much appreciated
Had it three times into the same dealer with no faulty codes and no errors. Updated and reseted adaptations and nothing changed. Now on Monday i took it to another Mercedes dealer, another franchise which they wanted to perform the gearbox service, filter, which i authrosied as my transsmisson service was last down 35k ago, and had the also replace the differential oil which i requested.
Had the car updated and adaptations reset and re taught the gears and the issue i am having is still there.
I have been informed now they can either remove the gearbox, inpsect and relpace any parts they might think are worn or order a brand new gearbox at a cost of 13,000 euro + fitting.
Can i get some advice from some one, as i never had this issue with my pre facilft C63. Has anyone expieranced this type of issue before and what was the problem as i searched high and low and not getting a clear answer by anyone. I am thinking maybe there is a solinoid fault ??? I am tired of no one able to fix me car.
Much appreciated
Senior Member
Joined: Jan 2018
Posts: 415
Likes: 109
From: Whitehouse Station, NJ
2012 C63 P31 Sedan
Is your car tuned? The symptoms you are describing are reasonably common on tuned cars with MCT transmissions (slipping during normal driving, but perfect at WOT). Mine was like this as well, until I had it custom tuned by @hachiroku (eightysixtuned), which completely eliminated the slipping in my case.
My understanding is some of the "off the shelf" tunes manipulate the torque management, which can lead to slippage an low or part throttle. One way to quickly diagnose your issue is to flash it back to stock (assuming you have the ability to do so). This issue should disappear quickly if it was tune related.
Of course, if the car was tuned by a previous owner, you may not be able to do this.
My understanding is some of the "off the shelf" tunes manipulate the torque management, which can lead to slippage an low or part throttle. One way to quickly diagnose your issue is to flash it back to stock (assuming you have the ability to do so). This issue should disappear quickly if it was tune related.
Of course, if the car was tuned by a previous owner, you may not be able to do this.
Former Vendor of MBWorld
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Joined: Oct 2016
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From: Georgia
2013 Mercedes C63 AMG
Sounds very similar to what I’m experiencing right now at low RPMs. Not as bad but the symptoms are somewhat similar. Mine has hard time settling down when coming to a stop and can be very shaky getting on it from a dead stop. Almost as if I’m 7 years old all over again trying to learn how to drive a manual in a mk1 golf. That’s how the car acts under 1k rpm any time I get on it. We adjusted the tune and while it helped a bit, the problem is still there.
I replaced the sparks, injectors, tranny mount, engine mount, tranny service, filters, intake boxes with no help. Next up is the PCV, IM gaskets, and TB plate.
I’ll let you know if I discover anything.
I replaced the sparks, injectors, tranny mount, engine mount, tranny service, filters, intake boxes with no help. Next up is the PCV, IM gaskets, and TB plate.
I’ll let you know if I discover anything.
Member
Joined: Jun 2019
Posts: 149
Likes: 16
From: NY
2012 C63 AMG P31 Coupe
Sounds very similar to what I’m experiencing right now at low RPMs. Not as bad but the symptoms are somewhat similar. Mine has hard time settling down when coming to a stop and can be very shaky getting on it from a dead stop. Almost as if I’m 7 years old all over again trying to learn how to drive a manual in a mk1 golf. That’s how the car acts under 1k rpm any time I get on it. We adjusted the tune and while it helped a bit, the problem is still there.
I replaced the sparks, injectors, tranny mount, engine mount, tranny service, filters, intake boxes with no help. Next up is the PCV, IM gaskets, and TB plate.
I’ll let you know if I discover anything.
I replaced the sparks, injectors, tranny mount, engine mount, tranny service, filters, intake boxes with no help. Next up is the PCV, IM gaskets, and TB plate.
I’ll let you know if I discover anything.
Former Vendor of MBWorld
iTrader: (1)
Joined: Oct 2016
Posts: 658
Likes: 233
From: Georgia
2013 Mercedes C63 AMG
My car has been doing this for almost a year. When the car is cold the issue is not very noticeable, but once I’ve been driving for a while the problem is very noticeable, especially in comfort mode. While driving in manual mode the car does buck a little bit at very low rpm’s when taking off from a stop. It’s been very frustrating trying to diagnose the problem since there are no issues at full throttle. My car is tuned, but the issue was present pre tune. The odometer just hit 59k miles.
Last edited by Slow_c63; Sep 2, 2021 at 08:08 PM.
Member
Joined: Jun 2019
Posts: 149
Likes: 16
From: NY
2012 C63 AMG P31 Coupe
You pretty much just described my car to a point. My car is also tuned, FBO, larger injectors, etc… I’m at 54k miles right now. I didn't have this problem prior to doing LTH and putting in ROWs and tuning the car. It feels like a vacuum leak, or PCV related, so I’m hoping that changing out the PCV eliminates this finally. Or else I’m not sure what to do…
Former Vendor of MBWorld
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Joined: Oct 2016
Posts: 658
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From: Georgia
2013 Mercedes C63 AMG
PCV is no easy task and I no longer trust any mechanics to work on my car. So I’m waiting for better weather in GA as I’m no fan of working on cars in 90-100 weather with like 80-99% humidity.
When I’m in the right state of mind and weather finally cools down I’ll be ripping the IM out and replacing the above.
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Member
Joined: Jun 2019
Posts: 149
Likes: 16
From: NY
2012 C63 AMG P31 Coupe
Might be your PCV then. I think our cars are leaning out and I believe the PCV is to blame for our issue. I’ve done plenty of reading and these symptoms went away after individuals replaced their PCV.
PCV is no easy task and I no longer trust any mechanics to work on my car. So I’m waiting for better weather in GA as I’m no fan of working on cars in 90-100 weather with like 80-99% humidity.
When I’m in the right state of mind and weather finally cools down I’ll be ripping the IM out and replacing the above.
PCV is no easy task and I no longer trust any mechanics to work on my car. So I’m waiting for better weather in GA as I’m no fan of working on cars in 90-100 weather with like 80-99% humidity.
When I’m in the right state of mind and weather finally cools down I’ll be ripping the IM out and replacing the above.
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From: Worldwide
2007 Mercedes E63 AMG
honestly sounds like an issue with a shelf tune. specific branded shelf tunes are awesome at full throttle, but anywhere else the transmission feels like its slipping as well as shifting at the wrong times. exactly as described in the original post.
but lets see what the original poster reports back to us.
but lets see what the original poster reports back to us.
Member
Joined: Jun 2019
Posts: 149
Likes: 16
From: NY
2012 C63 AMG P31 Coupe
honestly sounds like an issue with a shelf tune. specific branded shelf tunes are awesome at full throttle, but anywhere else the transmission feels like its slipping as well as shifting at the wrong times. exactly as described in the original post.
but lets see what the original poster reports back to us.
but lets see what the original poster reports back to us.
Former Vendor of MBWorld
iTrader: (1)
Joined: Oct 2016
Posts: 658
Likes: 233
From: Georgia
2013 Mercedes C63 AMG
I changed everything, from pcv, im gaskets, tb plate, injectors, sparkplugs, transmission service, same problem.
Now I need to educate myself in the procedure of replacing the valve body, and what all is required for the repair.
