2003 C240 Door Lock Problem

[hcr280]

When using key fob to lock car, the driver side door lock knob jumps up and down. Sometimes it locks and sometimes it dosen't. After a few tries it may work, if not I use the flat key. Suggestions?

[Buellwinkle]

It could be that one of the door lock plungers is jambed or disconnected from it's rod. I had this happen on my C230, the plunger was disconnected so it jambed against the side of the door and wouldn't unlock in my case.

[rmcfarlin]

Sounds like the Door Lock Mechanism. I just replaced mine this past weekend. Purchased from allmercedes.com. There are a couple threads here, one was Door Lock Solenoid "Bounce" that I found invaluable if you do it yourself.

[MBC240]

Mine went out, I had a warranty but it would have cost me $450 to replace. And that was at CarMax, not at Mercedes.

Expect to pay $500 at the dealer. The problem was the door lock motor/actuator.

[mystery905]

I had both driver and front passenger door locks do this. Both were repaired/replaced under warranty fortunately.

[victorcaloca]

My driver's side door lock is doing exactly the same.
Is there a do it yourself guide to this motor/actuator or solenoid replacement ? I would hate to break any plastic clips when bringing the door panel off.

thanks
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2004 Mercedes-Benz C230 Kompressor 65k miles