Seeking other perspectives on the AMG GTS DCT issue.

[blueWING007]

Greetings, everyone.

Sorry for the lengthy article.

My GTS, which I bought second-hand in January from a dealer that is not affiliated with Mercedes-Benz or AMG, has encountered a problem with the gearbox. The local Mercedes-Benz dealer has identified the issue as a problem with the clutch control clamp and is suggesting that it be replaced. This repair involves removing the gearbox, using specialised tools, and the estimated cost, including VAT, exceeds £11,000.

Prior to proceeding, I decided to get a second opinion by inquiring about the symptoms and consulting my knowledge of fault codes.

Relevant fault codes: Motor Electronics MED1775 - CODE u010387 - There is a failure in the communication with the electronic selection lever module. The message is absent.
The Direct Select interface with Code U119887 is experiencing a failure in its communication with the intelligent Servo Module (ism). The message is absent.
The electronic gearbox control system for the double-plate clutch gearbox is identified by the number 061B00. The control unit is experiencing a problem in its torque computation.

Indications:

    The car starts without any abnormalities, and there are no problem notifications shown on the dashboard.
    Engage the car's driving mode, specifically selecting the comfort setting. The first gear has been engaged. Press the gas pedal and the automobile accelerates smoothly without any problems.
    During the first upshift from first to second gear, there are two possibilities. Either the shift will smoothly engage at little below 2,000 revolutions per minute (rpm), or it may be quite abrupt and forceful, leading to one of two distinct outcomes:

    There will be a pronounced vibration, similar to that of a manual gearbox in an excessively high gear with the clutch disengaged, followed by:
        Several trouble notifications are appearing on the dashboard.
            The yellow damper symbol and the phrase "Malfunction - See Owner's manual" are shown.
            The notification "Electronic Rear Axle Differential lock inoperative" is shown in white.
            The red notification states that reversing is not feasible and advises consulting a workshop.
        An audible vibration emanating from the back of the vehicle.
        The gearbox automatically shifting into neutral.
        At times, the "Park" button illuminates while the vehicle is still decelerating.
        Once the red warning appears, the automobile will remain in gears 1, 3, 5, and 7 exclusively, with correspondingly longer gear changes. These shifts typically occur at about 3,000 revolutions per minute (rpm).
    Alternatively, the gearbox will consistently shift to higher speeds, resulting in a rough transition for each even gear. Similarly, downshifting into even gears will also be abrupt. If the even shifts are characterised by a lack of smoothness, I am aware that it will inevitably result in the occurrence of dashboard mistakes, usually occurring a few minutes into a voyage.

Initially, when this issue arose, the act of switching off the automobile, opening and shutting the doors, locking the car, and then leaving it for a duration of 10 minutes often resulted in the rest of the day proceeding without any more complications. I may discern the transmission's contentment by observing its smooth and seamless upshifting in comfort mode, occurring at around 1600rpm. When experiencing dissatisfaction, the upshifts take place little over 2,000 revolutions per minute. At times, when I switch the vehicle to manual mode, it will shift adequately, albeit the gear shifts are rather harsh and consistent. There is no alteration in gearbox NVH (save for the difficult shifts), no presence of whining, and no indication of a problem until it really happens.

The questions I have are:

    If there is a problem with a mechanical component, why does resetting the car's power fix it? Additionally, it is unclear whether electrical or electronic issues are causing the gearbox to malfunction and affecting the clutch control on the even/reverse gearset, or if it is a mechanical issue on the even/reverse gearset that is causing the electronics to malfunction.

Additionally, it is worth noting that the dealer is now anticipating that I will cover the cost of the specialised tools necessary to lift and service the gearbox, which is a significant expense amounting to around £2700 including VAT, as stated in the total estimate. Has anybody seen a situation where a dealer demands that the client bear the cost of the tools required to execute a job? I am aware that I have not. Evidently, the tools would become my own after the repair, for which I express gratitude. However, I would only incur charges if it is not possible for them to borrow the toolset from an other dealer. This dealership is affiliated with a prominent franchise company and has an AMG rating, distinguishing it from smaller local workshops. I fully plan to assertively communicate to them the unacceptability of charging for the tools, and if they refuse, I will request them to direct me to a dealership that already provides them. However, I wanted to inquire here first to see whether this is a widespread practice.

The available choices, as I see them, are:

    Provide the amount of £8.3k (excluding tools) to pay for the repair, use the third-party warranty I own to cover the first £5k, and/or
    Request a generous contribution from MBUK for the restoration of a 6-year-old vehicle with just 37k kilometres, which is considered short mileage for a gearbox mechanical breakdown. However, it is uncertain if the car was mistreated by prior owners.
    Contact the Mercedes-Benz dealership that now has the automobile to inquire about the possibility of them purchasing the car from me in its current condition, resulting in a significant financial loss compared to the amount I originally paid.
    Return to the original dealer and provide a legal case based on the sale of goods, demanding that they cover the cost of the repair or refund the full amount paid, with deductions made for any extra miles incurred while in my ownership.

I anticipate that choosing option 4 would lead to a protracted and possibly costly court procedure. This is because they sold me the automobile as a consignment sale on behalf of one of their customers, who had only had the car for a brief period of 3 to 4 months. This raised concerns for me when the issue arose. However, it is important to note that my sales contract is specifically with the current owner, not the former owner.

My thoughts on this matter are as follows: Should I trust the MB dealer and MB Technical who have diagnosed £11k worth of repairs? Is it possible that the problem will continue even after the repairs are done because the mechanical symptom is not the root cause? If I decide to proceed with the repairs, what is the best option for minimising costs? Should I make a plea to MB for goodwill, upgrade the warranty limit, or seek legal recourse for costs from the supplying dealer?

When the vehicle is functioning properly, it is simply remarkable. However, due to certain factors, my confidence in AMG engineering has been somewhat diminished. Despite this, I would ideally want to retain the car.

Thank you everyone, and I apologise once again for the lengthy article.

[BENZE220AMG]

The gearbox used is the Getrag 7DCL750, which is also used in the Ford GT and other Ferrari models. In my honest view, it would be advisable to see a gearbox expert instead than relying on the services of a Mercedes main dealer.

[BENZE220AMG]

The reason for the resetting during a key cycle is because when the system detects a malfunction, it switches to a limp mode where only one clutch is used. As a result, the issue is likely to be related to the clutch used for even-numbered gears. A key cycle will reset the limp state until the next occurrence of the issue.

[blueWING007]

Thank you. I have extensively searched the internet for comparable occurrences in many car transmissions, and it seems that an expert in Getrag transmissions may possess a more comprehensive understanding than Mercedes-Benz. The difficulty, as I see it, is that if the problem originates from the vehicle's unique control modules or electronics, I may find myself caught in a cycle of blame-shifting, where both parties engage in a futile fight, resulting in significant financial losses.

If anybody is aware of a reputable independent or Getrag gearbox expert in the South East of the UK, I would appreciate any information on their services.

[blueWING007]

Valuable perspective, thank you.

[BENZE220AMG]

It is essential to verify that the software upgrades are current, although I would expect the dealership to have already done so.

[blueWING007]

Reportedly completed...

[BENZE220AMG]

above, does extensive work for me including both Automatics and DCT's. I specifically specialise in opening transmissions with the model numbers 722.6 and 722.9, but I do not have the expertise to open any other kind of transmissions. I am uncertain about his level of involvement in these matters, although it seems likely that he does participate. Engaging in a conversation might potentially be beneficial. Specify You were referred by Gareth at ACE Engineering, Billingshurst. Direct contact with him is not possible, but, the ladies will record your contact information and he will respond to you at a later time. He is actively involved in a bustling establishment. At the very least, his advise will be accurate and precise.

[BENZE220AMG]

http://www.autogearboxes.co.uk/agbmobi/contact.html

[blueWING007]

Thank you for this, I appreciate it.

[diablos_carcv5]

Regarding the issue of sellers attempting to charge clients for tools. A Mercedes-Benz enthusiast I know was requested to purchase a specialised tool in order to do maintenance on his almost brand-new vehicle. I cannot recall the specific item, but its cost was little less than £1,000. This individual consistently purchased two new motherboards year. Unquestionably, he instructed them to proceed and the dealer purchased the item.
I recommend thoroughly examining the consumer laws to see whether you have a valid legal recourse against the garage that provided the goods or services within a timeframe of six months. It may be free of charge, with the only need being your time.

[QuirkyPixel]

OP, I predict that MB will extract the gearbox and outsource it to an expert. Subsequently, they will evaluate the expenses and likely attempt to market a new gearbox to you.

Continue doing independent research at this time.

[blueWING007]

I will proceed with the task. Based on the fact that they now lack the necessary instruments, it is likely that they have not before performed this work, which does not inspire trust in me. It is desirable that they be able to get a copy of the haynes handbook for the 7DCL750.
 

[BENZE220AMG]

Tea is present in abundance. Salutations!

[diablos_carcv5]

Presented below is the requested information.

[diablos_carcv5]

https://www.autorepairmanuals.ws/arm/threads/ferrari-gearbox-7dcl750-repair-manual.144364/

[diablos_carcv5]

https://go4trans.com/transmission/7dcl750/