2005 Nissan Altima trunks opens by itself

have you inspected rear support struts? they are readily available on line and parts store.

2008 Altima2.5S Trunk wont open GRRRRRR - Nissan Forums : Nissan Forum

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Dec 26, 2009 - 6 posts - ‎6 authors My trunk wont open from any of the buttons...the remote wont open it , the dash switch wont open it nor will the. ... Is there a fuse blown? ... 2007 Nissan Altima 3.5 SE CVT: 14.540 @ 96.530 MPH <----click here! ... When the cancel switch locatedinside the glove box is OFF, the trunk lid cannot be opened ... Trunk doesn't open
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First, have someone check the fuse; replace it if blown. Have someone check the button for electrical continuity; the button could be bad. Once trunk is open lube the cable and adjust it if necessary.

check your remote trunk switch

would suggest reprogramming

electrical trunk lid latch more likely broken if keep open release trunk.

If it doesn't even click, then maybe. My Nissan trunk latch needs lubricating or it doesn't open... Had to crawl into the trunk through the back seat hatch to open the emergency pull-cord. Twice.

check in your glove box on left hand side.valet switch may have accidentally set.let me know how you make out!

My wife is in San Francisco on business right now. She is driving this vehicle as a rental and found out that the trunk can be opened after you have locked the car the hard way. Her luggage and computer was taken from the trunk because of an outer trunk release button that you can access. Nicely done Nissan. Thanks. (sarcasm)

look for a what is called a valet switch under the dash.(it is a pushbutton switch or a toggle switch.) Have somebody help you and turn the key all the way to where it wants to crank the engine and press the button switch or flip the toggle switch at the same time . within 5 seconds at least.your antitheft light will come on and your alarm will sound once. That should bypass the anti theft locking and reset the ECU .Then try to start the car. I don't know if it will work , but give it a try.