5-speed 722.6 Transmission Problems
Senior Member
Joined: Aug 2013
Posts: 283
Likes: 2
From: Toronto, ON
2012 C300 Sport 4MATIC (current) 2006 C280 Elegance 4MATIC (sold)
In some cases it shifts better in tiptronic mode but one time I managed to get it to clunk when downshifting using tiptronic the odd time that I do use it. Funny thing is I notice the transmission shifts better after a second warm start. If I leave the house first thing in the morning and drive it in heavy urban traffic the tranny would act up especially when getting back on the gas or letting off of it. If I went somewhere to shop for example, turned the car off, start it up back 15 mins later or so then the transmission would shift a lot smoother in all situations.
So you installed the kit on the original valve body and had the tranny reprogrammed everything with the original valve body and kit installed? When you say adaptations do you mean just the transmission learning the driving habits of the driver or a factory type of reset. I mean there's the type of adaptation reset where you press down the pedal for 10 seconds whiles having the key in the 2nd position then shutting off the ignition and releasing the pedal which supposedly resets the learning the transmission does when you drive.
I'll talk to a shop about having this done and I'll order the kit if they're going to do this. I know of 2 really good Euro shops that specialize in MB products among others. Transmission work I'd never attempt. All I've done to this car myself is doing my oil/filter change, air filter change, spark plug change and change the front brake rotors and pads. The rest will be left to a shop.
So you installed the kit on the original valve body and had the tranny reprogrammed everything with the original valve body and kit installed? When you say adaptations do you mean just the transmission learning the driving habits of the driver or a factory type of reset. I mean there's the type of adaptation reset where you press down the pedal for 10 seconds whiles having the key in the 2nd position then shutting off the ignition and releasing the pedal which supposedly resets the learning the transmission does when you drive.
I'll talk to a shop about having this done and I'll order the kit if they're going to do this. I know of 2 really good Euro shops that specialize in MB products among others. Transmission work I'd never attempt. All I've done to this car myself is doing my oil/filter change, air filter change, spark plug change and change the front brake rotors and pads. The rest will be left to a shop.
Thread Starter
Junior Member
Joined: Apr 2015
Posts: 63
Likes: 3
From: Minnesota
2004 C320 4matic sedan
The step on the gas pedal, turn the key, etc technique did nothing for mine.
What worked was to connect a Star computer tool to the vehicle computer and reset the transmission adaptations to factory defaults.
The Sonnax kits are cheap, but the labor to install them will not be! I'll guess that someone who knows what they are doing could do it in about 3 hours. No guarantee that this will resolve your particular problem though.
If your shop has the proper computer tool it would only take a few minutes to reset the transmission adaptations first - to see if that does anything. If that does not work then they could try the Sonnax kits or conductor plate or solenoid(s)...
What worked was to connect a Star computer tool to the vehicle computer and reset the transmission adaptations to factory defaults.
The Sonnax kits are cheap, but the labor to install them will not be! I'll guess that someone who knows what they are doing could do it in about 3 hours. No guarantee that this will resolve your particular problem though.
If your shop has the proper computer tool it would only take a few minutes to reset the transmission adaptations first - to see if that does anything. If that does not work then they could try the Sonnax kits or conductor plate or solenoid(s)...
Thread Starter
Junior Member
Joined: Apr 2015
Posts: 63
Likes: 3
From: Minnesota
2004 C320 4matic sedan
As a follow-up... the transmission continues to work perfectly!
However I have not been driving the car much because of the engine "lifter-like" ticking noise. Until I can diagnose that I don't want to make things worse!
However I have not been driving the car much because of the engine "lifter-like" ticking noise. Until I can diagnose that I don't want to make things worse!
Super Moderator
Joined: Mar 2007
Posts: 5,295
Likes: 22
From: VA
THE C350
Can you get a sound clip of the noise it makes?
As for you transmission issues I had a similar experience with a fellow members car. The dealer said he needed a new transmission and 15 minutes with my star machine resetting the adaptations he has been good for I believe almost two years now.
As for you transmission issues I had a similar experience with a fellow members car. The dealer said he needed a new transmission and 15 minutes with my star machine resetting the adaptations he has been good for I believe almost two years now.
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