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Old 04-28-2014, 03:11 PM
apb apb is offline
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Join Date: Mar 2001
Location: Houston, Texas
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722.9 conductor plate and encoding

My indy is suggesting i need new transmission conductor plate and encoding. He cannot do the work and is suggesting dealer. I called a local transmission shop that says they can handle. Is it realistic that a transmission shop that specializes in imports can do this, or is there a magical dealer only equipment involved??

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2010 GLK350
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Old 04-28-2014, 03:24 PM
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Location: Soperton, Ga. USA
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It is a good diy'er job with the exception of the setting it up with the computer. If I were going to hire out the whole job I think I'd take it to the dealer.
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Old 04-28-2014, 04:39 PM
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Join Date: Feb 2004
Location: Austin, TX
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What are the symptoms, and what codes is it throwing?

It is my understanding that with the 722.9, the valve body often needs replacement, as opposed to just the conductor plate, which is a common repair on the 5-speed. For a while MB was having to repair so many of these that the valve body was only available at the dealer, and even then there was sometimes a wait. However, at the end of this post, the OP suggests there is some sort of "kit" now available at MB for the repair:

At any rate, I agree with engatwork, I'd probably just take it to the dealer...
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Old 04-28-2014, 06:22 PM
apb apb is offline
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Many thanks!
2008 S550
2010 GLK350
1997 E420 (retired)
2005 CLK500 (retired)
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Old 04-29-2014, 12:10 PM
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Join Date: Sep 2002
Posts: 2,898
It's real simple. If the transmission shop has an SDS they can do the job. If they don't they can't. 722.9 conductor plate replacement is only the fix for a few issues and is determined by the specific fault codes. I've had indy shops replace the CP's and tow it to me to program only to find out the CP wasn't gonna fix it. I've got no beef with the indy shops but I think you're better off having the diagnosis done at the dealer.
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Old 04-06-2018, 12:54 AM
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Join Date: Aug 2002
Posts: 56
Vendors can fix your 722.9 conductor plate for < $250

Bumping this old thread with the 20/20 hindsight that comes from the passage of five years since the post and having just fixed this problem and done a YouTube video on the repair.

Yes, the 722.9's had a set of consistent problems, and resulted as usual in a class action suit when MB denied knowledge of any failure pattern (Mercedes named in class action lawsuit over defect in the 722.9 7G-Tronic automatic transmission | Got a Class Action?) but the problem of the transmissions shutting down the controller (with no Check Engine Light) was well established, and the cause was failed conductor plates, just like their 722.6 predecessor. It would have been an easy fix if MB hadn't *coded* the replacement plate (has to be coded in with a STAR machine), and refused to sell the parts over the counter or to independents, citing it as a "theft part" to get around Right to Repair laws, guaranteeing your only option was... pay the dealer the $2,500 to $3,500.

The market has adapted, and the situation has improved, and I am now living proof that...

1. There are many suppliers who will fix your actual bad conductor plate for $200 to $250 so no recoding is necessary
2. It takes just a messy half day to pull and replace the valve body and remove the plate (although the car is down while waiting for repair at the vendor)
3. You can clear the code with an Autel scanner

...because I did it and have the YouTube video to prove it...

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