Paulinelinker Posted July 12 Share Posted July 12 I am experiencing a problem with the MCT gearbox on my 2010 E63. Currently, there are no error messages shown on either the gearbox or the engine control unit (ECU). The gearbox exhibits abrupt movements when shifting between gears 2 and 1, or 1 and 2, as well as while accelerating forcefully. However, during regular driving, the gearbox operates smoothly up to the 7th gear. Additionally, there is a tendency for the vehicle to go forward when it is stopped and in drive, even with the foot on the brake. Do you have any insights about the issue? Quote Link to comment Share on other sites More sharing options...
Darrellll Posted July 12 Share Posted July 12 How long have you owned the car? Has this behaviour occurred just recently? It might be beneficial to consider doing a gearbox oil filter replacement. Alternatively, you might seek the expertise of an automotive professional. Does it exhibit improper behaviour in all gearbox configurations or just in D mode? The gear changing in sport mode is much more aggressive compared to D mode. Is it possible for clutches to be worn on the clutch pack itself? while the sport gear box option is engaged, shifting from 2nd to 1st gear may seem less smooth compared to while in D mode, since the gear box only descends to 2nd gear. In my own opinion, I believe the "d mode" to be the most seamless configuration, particularly when used in a more relaxed environment. Quote Link to comment Share on other sites More sharing options...
Matt865 Posted July 12 Share Posted July 12 Have any trouble codes been detected by the STAR diagnostic system? Have the gearbox and engine mounts been replaced throughout the span of 14 years? Under what circumstances would they not be subject to being shot as well? Quote Link to comment Share on other sites More sharing options...
Paulinelinker Posted July 12 Author Share Posted July 12 There are no fault codes present, and the gearbox has been maintained. The issue occurs more often when the vehicle is in S or S+ mode, namely when the accelerator is fully pressed. However, if the vehicle is driven normally, the issue does not occur. The jerking motion might be forceful. Quote Link to comment Share on other sites More sharing options...
Darrellll Posted July 12 Share Posted July 12 Was the issue present prior to the service? At what mileage was the service performed? The amount should be around 37,000 initially, followed by subsequent amounts of 30,000 each. Requires the expertise of a professional for examination. It remains speculative until you can limit the possibilities. Has the TCU (Transmission Control Unit) received an update? There might be a multitude of possibilities. Consult with a Mercedes-Benz expert or specialist to examine the issue for you. As mentioned before, the changes might seem more abrupt when driving aggressively compared to driving in a more controlled manner. When I experienced a vibration originating from the gear box, I discovered that the issue was with the gearbox mounts. Replacing the mounts resolved the problem. In my own opinion, I believe the MCT to be really satisfactory and reactive, albeit it lacks the seamless operation of a TC automatic gearbox. However, both varieties have advantages and disadvantages. The M mode is appropriate if you choose to engage in a recreational activity. The D setting is optimal for regular driving. Success S+ I often have confusion and struggle to adjust to my preferences in either an upward or downward direction. The outcome is entirely contingent upon the conditions of the road and the flow of traffic. Quote Link to comment Share on other sites More sharing options...
Paulinelinker Posted July 12 Author Share Posted July 12 The software on the TCU has been upgraded. However, local independent mechanics lack knowledge and are speculating on the issue, with one suggesting it is related to the gearbox and another suggesting it is related to the MCT. Both are just guessing, and I am reluctant to spend money on such uncertain diagnoses. Quote Link to comment Share on other sites More sharing options...
Paulinelinker Posted July 12 Author Share Posted July 12 The gearbox I placed in my vehicle has no known history, save that it has been driven for 54,000 miles and has been well-maintained. I also performed a gearbox service when I installed it. Quote Link to comment Share on other sites More sharing options...
Paulinelinker Posted July 12 Author Share Posted July 12 I suspect that the issue lies with the MCT, but I want absolute certainty. It is worth noting that a defective MCT will not generate a failure code. Quote Link to comment Share on other sites More sharing options...
Paulinelinker Posted July 12 Author Share Posted July 12 My next course of action would be to take it to an automotive gearbox expert. Quote Link to comment Share on other sites More sharing options...
Darrellll Posted July 12 Share Posted July 12 What became to the original gear box? Quote Link to comment Share on other sites More sharing options...
Paulinelinker Posted July 12 Author Share Posted July 12 I have successfully fitted an E63 MCT gearbox into my W202 C43. Quote Link to comment Share on other sites More sharing options...
Paulinelinker Posted July 12 Author Share Posted July 12 Prior to this, I had a total of 722,636 units from the W211 E55. Quote Link to comment Share on other sites More sharing options...
Paulinelinker Posted July 12 Author Share Posted July 12 Can somebody provide the accurate component number for the 2009/2010 MCT? The part number I possess is A221 250 03 01. Quote Link to comment Share on other sites More sharing options...
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