Originally Posted by
Martyx
I ordered one shift solenoid last night and I am actually looking on ebay as we speak for a TCU. I'll try the TCU first and work from there. Like you said, I just hope it's a low cost thing.
I think replacing the TCU is a good option. From your post I could not tell if you had replaced the conductor plate. The speed sensor on the plate are a known failure point. Research Mercedes 722.6 conductor plate failures. While you got everything apart I would say replace the solenoid too.