2001 c240:
Trunk will not open with keyless entry key-fob, I can only access the trunk manually with the valet key. It's not the key-fob, bc's unlock and lock options work for the locks. Anyone know what I should check, or know the part if any I need to change to repair this problem.
Thank you.

 

I have an '03 C240 with the exact same problem. Key fob works fine for locking and unlocking. Did you find out any answers?

 

If you have a 2nd key-fob, you could double check and make sure it's not the 1st one. Does it make any noises?

Just a guess; but I would think that it has something to do with the wiring or components that are used for the auto release, and not the key-fob.