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Old 07-15-2008, 10:01 AM   #1 (permalink)
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Vehicle: * 2003 C240 w/61k * 1994 C280 w/226k! Totaled 06/16/08 *
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2003 C240 Door Lock Problem

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?
* 2003 C240 Wht/Tan
* 1994 C280 w/226k! Blk/Blk Totaled 06/16/08
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Old 07-15-2008, 11:18 AM   #2 (permalink)
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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.
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Old 07-15-2008, 04:34 PM   #3 (permalink)
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Vehicle: 2002 C230 Kompressor Coupe
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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.
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Old 07-15-2008, 06:25 PM   #4 (permalink)
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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.
2003 Mercedes-Benz C240 5AT - 72k miles
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Old 07-16-2008, 07:34 AM   #5 (permalink)
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I had both driver and front passenger door locks do this. Both were repaired/replaced under warranty fortunately.
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Old 10-02-2008, 01:13 PM   #6 (permalink)
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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.

2004 Mercedes-Benz C230 Kompressor 65k miles
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Old 06-29-2011, 04:10 AM   #7 (permalink)
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Did you get this fixed? Was it the lock actuator?
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Old 07-03-2011, 05:48 AM   #8 (permalink)
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Vehicle: 2005 C240 silver, 2008 R320CDI Cubanite
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it is the door lock mechanism. No choice but to replace it. Not fixable I tried.
The repair is dooable but not easy. If you are concerned about plastic door panel clips then I suggest you dont do it. You ahve to remove the side airbag by drilling out the rivets, even remove the door handle, dismantle the window guides etc even then it is hard to get the part in and out. There are a few threads here. or get a hays manual for 25$ to see the step by step.
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2008 R320CDI Cubanite Silver
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