Good morning. I hope you are all doing great. I am having issues with my 2005 clk 320 cabrio. Just got the car about 2 moths ago with 105K miles. Had it inspected by a specialist before buying and was in overall good condition except for a LOT of CAN codes, mainly those that go like: info not available on the CAN bus. However, nothing was wrong with the car and all the codes were "false". Meaning that whatever the code said was failing, was working perfectly.

I had no issues with the car until sunday when after getting of a freeway and make a complete stop, i felt the car was weak, like when one tries to start moving a car from 3rd gear or so (a manual one). I was able to move anyways and pull over on a quiet street. I out the car in P, turned it off and back on. Then i put it on D and it went right into gear. It moved but didnt upshift, then i noted a check engine light and also realized that my C and D letter were missing on my dashboard. The lever is NOT stuck, i can put the car in R N D and P put that wont be displayed on the dashboard.

As i dont have the diagnostic tools for a mercedes, i took it to a near shop where they an inspectio and autologic scan. The inspection showed leaking from the transmission pan and the autologic scan showed all the previous CAN codes that i had a couple new ones:
EGS52 (SERIAL) 722.6
P2310
P2311
P2312
P2313 (Was already there)
P2314 (Was already there)
P2315
P2316

The garage told me they think this is related to the CAN bus problem and that they will need to remove the carpet to test all connections there and want charge me 800 usd for it. I read a lot of 722.6 trans have issues with the adapter plug and the conductor plate and that these are a MUST check if you are in limp mode and have a leak. However, they said this is not related without even checking these.

Do you agree that the best way to proceed is checking connections instead of checking the adapter plug and conductor plate? or this garage just trying to squeeze my money? Should i bring the car back home and try to address the leak first before taking carpets off?

Thanks so much, any help is welcomed!

 

I decided to bring th car home and check it myself. There indeed a leak under there, i am not 100% sure it is comming from the transmission but it is all under the trans pan so i guess it is. I inspected the adapter plug and although it was not soaked in fluid i did find some fluid there, i wouldnt say it was enough to cause problems. I cleaned it with electric parts spray and put it back.

I then looked for the TCM under the passenger's carpet. To be honest it was bone dry and all the pins and connectors were rust and corrosion free. Of course i couldt open the TCM itself but base on the findings i dont think the problem is there.

Is there any way of testing the TCM ?

If not, or if the testing is normal i guess i will proceed with getting a new conductor plate.

Once again, any help is welcomed! I am just posting my progress in case it helps someone else.

 

I'm having the same issue, did you figure it out? what was the cause of the problem, Thanks in advance