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Try pushing the trunk release and turning the key in the lock at the same time.
It sounds like the electric lock has not released for what ever reason.
You should hear the trunk release relay when you push the remote.
Fixed!!! I had several problems with my wife's remote start/lock/unlock/trunk/ panic. First it stopped working, i replaced the battery to find out that the battery holder inside the remote had broken solder at two points. Went to Harbor Freight bought a solder gun for $5 and solder wire for about $2. Once home i soldered the points back together (first time i've ever soldered anything). Put the new battery in and it didn't work. I pulled the whole thing apart and took the circuit board and touched the contacts where the button would have pushed at with a piece of metal. They locked and unlocked the car. So i knew at that point that the rubber thing was jacked. i got some tin foil and 5minute epoxy. Then i clued little tiny squares on the little black Nipples where they would contact the circuit board. Waited 6 minutes and put back together. Found out that if you start the car twice with out puting the key in the ignition you can't use the remote start. After putting the key in the ignition and starting it you reset the system and can remote start again. Dealer wanted 114 for the key remote and 54 to reprogram the remote to the car. I fixed my factory remote for under $20. Hope this helps someone
Put a voltmeter on the battery whilst cranking. Sometimes a marginal battery will have a big voltage drop that will cause the engine to crank but not start with the remote starter but it will start with the key. One attempt with the remote puts unburnt fuel in the engine that throws off the next attempt to start with the key.