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#1
04-28-2014, 03:11 PM
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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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2008 S550 2010 GLK350 1997 E420 (retired) 2005 CLK500 (retired) 
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#3
04-28-2014, 04:39 PM
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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: http://www.peachparts.com/shopforum/tech-help/341096-2006-e350-stuck-gear.html At any rate, I agree with engatwork, I'd probably just take it to the dealer...
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Christopher '06 Mercedes E350 station wagon (silver/black) '85 Mercedes 300D (black pearl/palomino) '85 Mercedes 300SD (smoke silver/burgundy) '79 Cadillac Sedan DeVille '05 Toyota Camry (because always running is nice) '85 Mercedes 300D sold back to orig. owner 8-1-06 '84 Volvo 264GL Diesel, owned 2000-2013
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#5
04-29-2014, 12:10 PM
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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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#6
04-06-2018, 12:54 AM
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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... https://youtu.be/gpkkEySV6ZE
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