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X3 E83 (2004 - 2010)
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Old 07-27-2015, 01:45 PM
dawg502 dawg502 is offline
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Join Date: Jul 2015
Posts: 1
Mein Auto:
2008 X3 - Tailgate opens when slowing down

Help!!! About 3 months ago, I was slowing down at a stop light & my tailgate unlatched (like I pushed the button on my keyfob). I at 1st thought I accidentally hit the button on my keyfob but later found out that wasn't it. The reason I know that is b/c it did it a few days later (also when slowing down at a light). Over the past 3 months, my tailgate has unlatched (opened - but not gone up), about a dozen times (all when slowing down - using my brake).

I then thought the battery was low in my keyfob & or the actual keyfob was going bad. So for a couple of weeks, I used the spare (which is like new) & it still happens on occassion. So that tells me it's not in the keyfob.

Any ideas?

The only other thing I have done over the past several months was to get the dealer to put in a new actuator/ transfer case & to put in a new brake light (one was out in the tailgate).

Surely one of those didn't cause this?? This is annoying b/c all the interior lights come on. I have to pull over & close the tailgate. Frustrating!!!

Any help would be greatly appreciated!
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Old 07-29-2015, 01:13 PM
bmwbob89 bmwbob89 is offline
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Location: Newburyport Ma.
Join Date: Oct 2012
Posts: 47
Mein Auto: 2004 X-3 740i 325xi 88M5
Check and see if the wiring loom going into the lid is shorting out. The wires can crack and short together. Then power goes from the brake light to the latch. That can happen on the other cars so check that. The wires break from opening and closing the lid over time.
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Old 07-29-2015, 02:37 PM
joylove joylove is offline
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Location: USA
Join Date: Mar 2013
Posts: 1,568
Mein Auto: 08 e83 LCI
Could also be water ingress somewhere in the boot.
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Old 07-30-2015, 07:38 PM
sidecartommy sidecartommy is offline
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Join Date: Jun 2015
Posts: 1
Mein Auto:
2008 X3 - Tailgate opens when slowing down

I have had similar problems, I haven't noticed that it happens during braking, but I will try and notice if it's correlated...
My thought was the same as yours, that I must've (continually) hit the trunk open button on my key fob...even had my car broken into because the gate was unlatched in the middle of the night!(that part I don't understand)
So has anyone else dealt with this problem before??
My problem led to draining the battery which cost me way too much money to fix, yes I could've done it myself, but time ran out...

Last edited by sidecartommy; 07-30-2015 at 07:42 PM.
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