Recently, my 722.9 7-speed tranny started to malfunction. The symptoms were that it would not downshift from higher gears when trying to accelerate and then not moving at all if I came to a stop. Turning the car off and on fixed the problem for a while, but it started to happen more and more and I considered it a safety issue. The code was 2205: Component Y3/8n1 (Turbine speed sensor (VGS)) is defective.
I decided to remove the conductor plate and send it off to Circuit Board Medics for repair. (I had bought the speed sensors previously, but decided I didn't want to tackle the soldering job or take any other chances.) In the process of removing the valve body assembly, the conductor board connector broke off. It is plastic and after 14 years, had become stuck to the tranny housing. Had I reviewed the Mercedes instructions first, I would have known to push the connector down from the top instead of trying to pull it out.
I was really distraught because I knew this job had just gotten more expensive. I had gotten quotes from the dealer ($2000+) for a complete valve body assembly and another transmission shop (Factory Direct Transmissions) for about $1100 for a new and programmed conductor plate. (BTW, Factory Direct Transmissions will sell you a certified transmission including the torque converter shipped both ways for $2995.)
But Circuit Board Medics were able to rig up a pigtail to the broken connector ribbon cable and clone the conductor board to a replacement board they had in stock. They spent a couple of days trying to download the coding from the original TCU and were finally able to. I installed it (carefully) back in the car and now it runs great--no codes or other issues. While it ended up costing $499, it was far cheaper than the other options. I can recommend Circuit Board Medics without hesitation--they were awesome.
NOTE: I have a first generation transmission valve body assembly. I think there are about four generations. 1st gens are NOT compatible with the later generations. I believe the solenoids are different or something. Be aware of this if you try to replace any parts.
I decided to remove the conductor plate and send it off to Circuit Board Medics for repair. (I had bought the speed sensors previously, but decided I didn't want to tackle the soldering job or take any other chances.) In the process of removing the valve body assembly, the conductor board connector broke off. It is plastic and after 14 years, had become stuck to the tranny housing. Had I reviewed the Mercedes instructions first, I would have known to push the connector down from the top instead of trying to pull it out.
I was really distraught because I knew this job had just gotten more expensive. I had gotten quotes from the dealer ($2000+) for a complete valve body assembly and another transmission shop (Factory Direct Transmissions) for about $1100 for a new and programmed conductor plate. (BTW, Factory Direct Transmissions will sell you a certified transmission including the torque converter shipped both ways for $2995.)
But Circuit Board Medics were able to rig up a pigtail to the broken connector ribbon cable and clone the conductor board to a replacement board they had in stock. They spent a couple of days trying to download the coding from the original TCU and were finally able to. I installed it (carefully) back in the car and now it runs great--no codes or other issues. While it ended up costing $499, it was far cheaper than the other options. I can recommend Circuit Board Medics without hesitation--they were awesome.
NOTE: I have a first generation transmission valve body assembly. I think there are about four generations. 1st gens are NOT compatible with the later generations. I believe the solenoids are different or something. Be aware of this if you try to replace any parts.
