Generally no. Normally they are replaced with a new unit.

 

What's wrong with it?

 

Absolutely not. The plastic gets brittle and once installed and removed, generally not usable. The 722.6 is a trash can item when it is replaced.

The 722.9 is another story. There are plenty of people repairing those but I believe that they need to be replaced as well. Shortcuts are often short lived.

 

Yes, you are all correct. I thought of asking, but I agree any repair will prove short lived.

 

When I had the dealership/repair shop, we did a few of these. The job is not hard but it does require programming that is only done by the dealer. The car will drive in limp mode without programming, but I'd recommend a tow to the dealership for a proper repair.

Please feel free to add to this discussion everyone.

 

Agreed on the 722.6 conductor plate. With it not containing the ECU and needing no coding, there's no reason to attempt a repair. Besides that, you can buy an entire kit with a new conductor plate, filter, gasket, and electrical connector pilot bushing (everything needed except the fluid) for $250.

For repairing the 722.9 conductor plate, I'd recommend sending it off to a specialty shop that will basically transplant your ECU from the bad one into a new one. No coding needed. An alternative is if you have SDS w/developer mode, and you can get your hands on a new conductor plate, you can transfer the SCN code from yours to the new ECU. Either way, no trip to the dealer needed.

 

Dear rudeney,
In which heaven are you living in!! The parts you describe purchased locally (in Cyprus) from the dealership and costed Euro 483 (Abt $484)

 

Good point rudeney - I never did use the copy/paste part of the scan tool but I suppose that would work as well.

 

722.9 box you can only program a brand new component (Security part). New conductor plate £1000+++ and only available from dealer.

If you have know how you can program a used conductor plate, but not easy and you will need vediamo or monoco to do it.

main failure in 722.9 conductor plate is contamination in valves, or failed speed sensors (turbine) so no problem in getting these refurbished with new valves and turbines, and financially makes a lot of sense.

 

Yes, I understand. There are aftermarket conductor plates here as well, but I thought better to install an oem part. Transmissions are so delicate to experiment with aftermarket parts, oils etc. Maybe I have the wrong impression.

 

The aftermarket conductor plates are just fine. They are basically a cassette to hold the circuits for the solenoids. I have used the aftermarket conductor plates with absolutely no issues. Don't forget, the OEM failed over time, too.

 

You are absolutely right! I learned this the hard way. Now I know.

 

While my '07 CLK350 is in the shop getting a whole new (rebuilt) transmission I found this article which provides a brief but interesting history of Mercedes transmissions. Like everything else these days this process is taking longer than normal, but as the dealer is paying for it and gave me a free loaner I can be patient.

Automatic transmissions of Mercedes-Benz - Hõbenool

The Mercedes-Benz holding company Daimler is one of the few car manufacturers who designs and manufactures their own transmissions. For a long time, Daimler has been using numbering 722, which means automatic transmission of the car. The subsequent number in turn shows the generation. Find out more!

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