Good question, the SLk55 doesn't appear to be under models anymore......but you can still build an SLK55.

I have recently started having a very similar issue with my 2006 SLK55 AMG. I have about 50,000mi on it, and it started to throw the Speedtronic Malfunction "Visit Workshop" error. Initially the errors it displayed were: ABS, ESP and Brake Wear. The first few times this happened, it went away after I turned off the car and started it back up. Today it threw the code while I was driving on the freeway, and all of a sudden the Speedometer went to zero, even though I was still traveling at 70mph. I could still continue to drive and brake, but there was some sort of rev limiter in place. I also noticed a sudden loss of the power steering. I can't get the problem to disappear this time. The car is meticulously maintained. I hope they are able to resolve this issue, as it is out of warranty. As a note: my brake pads and wear sensor are still almost brand new. Any insight or updates on people who had similar issues, is greatly appreciated!

UPDATE: The problem ended up being a faulty ESP Control Module. After it was diagnosed and replaced by my great mechanic, everything is back to normal.

Glad to hear you got the issue solved.

A faulty ESP Control Module is a simple fix, but it creates a few errors which make it seem like you have a lot of different problems all at once.

Time to enjoy your little beast again!

Its like that on any car site. Talk bad about a Hyundai, Honda, BMW or Toyota in public and people freak out. The reality is that no matter you buy its going to break or need repairs. Thats life. Anyone who thinks cars dont break has never worked on a car before and has no idea how many parts make up one. I have been a Benz owner since day one and I had a couple issues here and there. Nothing unusal and nothing that couldnt happen on any other car.