E-Class Coupe (C207) & Cabrio (A207) 2010-: E250CDI Coupe, E350 Coupe, E350CDI Coupe, E500 Coupe, E550 Coupe [Coupes & Cabriolets]

Trunk popping open and alarm going off randomly

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Old 01-29-2015, 01:08 PM
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2014 E550 Coupe and 2010 E350 Sedan
Trunk popping open and alarm going off randomly

The car is possessed. I did a search that said things about resyncing my key...which is really weird.

Anyone experience this? The car is a 2014.
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Old 01-29-2015, 10:50 PM
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2014 E550 Coupe and 2010 E350 Sedan
I hope not to jinx it, but after disconnecting the battery last night so it wouldn't keep going off, it seems to have stopped. I really hope it was just some weird fluke.
Old 01-30-2015, 03:08 PM
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Went to get in my car for work this morning, and the trunk was popped open again. No alarm this time though...
Old 01-30-2015, 03:15 PM
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2014 E63S; AMS 100 octane ecu tune; edok tcu tune; BB intakes; dyno tuned
Could someone have replicated your radio signal??

Does it happen anywhere other than your garage at home?
Old 01-30-2015, 03:17 PM
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I suppose it should be noted, I'm missing one of my key fobs which was really low on battery power last time I had it. It must be in the house, since the issues only happen at home so far.
Old 01-30-2015, 03:19 PM
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Then check between sofa cushions ... Someone is sitting down and pressing the keyfob
Old 01-30-2015, 03:32 PM
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I doubt that when I'm the only one up when this is happening. I'll check my office chair though, haha.
Old 01-30-2015, 04:37 PM
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It may be in the car... The lost keyfob

Trunk pops if it detects key in trunk
Old 01-30-2015, 04:42 PM
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I thought that too, but didn't see anything. I tried starting the car, and it said key not detected. If it were in the trunk, it wouldn't stay closed all day at work, and just pop open late at night.

I was thinking it was in my wife's purse or something, but I can't find it in there. It's bugging me!
Old 02-03-2015, 09:06 AM
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This has happened to me a few times on my E550 Cab. Once in me garage and all the other times at my office with the key fob outside of my pocket.
Old 02-03-2015, 11:45 AM
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Mine was happening just at home, so I figured it had to be the lost key fob somewhere, but I just can't find it. The issue has since stopped happening...for now. dun dun duuuuunnnnn
Old 02-03-2015, 11:54 AM
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That is bizarre....I haven't had the pleasure on mine yet.
Old 02-03-2015, 04:36 PM
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A while ago there was a post about the trunk popping open and it turned out that there was a short in the wiring to the trunk. If I remember, the wiring runs close to the body and vibrations or something caused the insulation to split.
Old 02-04-2015, 12:24 PM
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Mystery solved! I mentioned I had a missing key fob right? Well, I double-checked all my pants and jackets again. I found it in a pair of pants that had been cleaned about a week ago! Key gets wet, air dries with the pants...and that has to be why weirdness was happening. Key is now dead, and I haven't had an issue.

Now, to replace the key or just live with the one. Anyone know how much it is to get a replacement and reprogrammed key?
Old 02-04-2015, 02:18 PM
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Originally Posted by SnakeDoctor
Mystery solved! I mentioned I had a missing key fob right? Well, I double-checked all my pants and jackets again. I found it in a pair of pants that had been cleaned about a week ago! Key gets wet, air dries with the pants...and that has to be why weirdness was happening. Key is now dead, and I haven't had an issue.

Now, to replace the key or just live with the one. Anyone know how much it is to get a replacement and reprogrammed key?
Want a new key? Get ready to take out a new mortgage!!!!!
Old 02-04-2015, 06:05 PM
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Old 02-04-2015, 08:09 PM
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You should always have a second key
Old 02-07-2015, 02:56 PM
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Did the trip through the wash actually ruin the key? I once dropped the key fob for a C250 into a wash bucket, and was able to use the key after drying it and changing the battery. Sometimes the car wouldn't recognize that the key was in my pocket, but other than that it was fine.
Old 02-07-2015, 07:25 PM
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Originally Posted by CPatrick
Did the trip through the wash actually ruin the key? I once dropped the key fob for a C250 into a wash bucket, and was able to use the key after drying it and changing the battery. Sometimes the car wouldn't recognize that the key was in my pocket, but other than that it was fine.
I'll have to try replacing the battery and see if it's shot or not. I guess I just assumed...yeah, we know what happens when you assume.
Old 02-09-2015, 11:45 AM
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The other day i went out and saw the trunk popped open in the garage and I thought of you. Then I realized I must have done it when I bent over to tie my shoes with my key in my pocket. Whew...
Old 02-09-2015, 11:55 AM
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Originally Posted by Kirkster
The other day i went out and saw the trunk popped open in the garage and I thought of you. Then I realized I must have done it when I bent over to tie my shoes with my key in my pocket. Whew...
Haha! I'm just glad when it's owner/operator error.
Old 02-10-2015, 10:03 AM
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Originally Posted by Kirkster
The other day i went out and saw the trunk popped open in the garage and I thought of you. Then I realized I must have done it when I bent over to tie my shoes with my key in my pocket. Whew...

Happens to me all the time.
Old 02-19-2015, 11:36 PM
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if you have a dog, then he probably has it hidden somewhere like his own personal chewy toy! lol! let me see... how 'bout i bite this panic button... ok, someone's trying to steal the car. let me try this other button... nothin' there... but, your trunk is popped open in the morning...
Old 03-30-2015, 03:27 PM
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Originally Posted by CPatrick
Did the trip through the wash actually ruin the key? I once dropped the key fob for a C250 into a wash bucket, and was able to use the key after drying it and changing the battery. Sometimes the car wouldn't recognize that the key was in my pocket, but other than that it was fine.
So I finally got replacement batteries for my keys since my single working one was getting low. I went ahead and threw a new battery in the washed key...it works still!!!

Good call CPatrick.
Old 03-31-2015, 07:25 AM
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Good news, Snake!

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