I have a 2010 Buick LaCrosse with push button start. My installer tried 3 different models of remote starters and none will work. Any advice out there for me?

Question edited for clarity.
Question moved to model clarity.

https://www.google.com/search?q=2010+Buick+LaCrosse+3.0.+cylinder+head+bolt+Torque

Some versions of the Lacrosse did not have a remote release fitted. Try pushing the edge of the fuel door nearest the front of the car in towards the filler hole. The flap should swing out the same way the doors do on that side.
Another type uses a 'click' latch. Push the Rear edge of the fuel door in towards the filler hole until you hear a slight click noise. Release the pressure and the fuel door will spring open a small amount. To close the click type you simply push the flap closed until you hear the click noise again.

You might try this:

http://blog.carandtruckremotes.com/2014/09/11/how-to-program-buick-lucerne-keyless-entry-remote-fob/

But if it does not work you will need to see if there is a local locksmith that can assist you.

Is your remote in your pocket? I keep mine in with my other keys, and my brothers car starts because some thing in his and my pocket keep pushing the buttons to open it. make sure that the release in the glove compartment doesn`t have any thing up against it like paper between the door and the button.

You need the engine light issue looked into, it is likely why the system has diabled the remote start system

Have you had it checked to see if DTC'S - diagnostic trouble codes stored in the BCM - body control module ? That's the first thing you should have done . Dealer or other independent reair shop that has a factory or professional type scan tool . Auto part stores can't pull these codes .
The keyless entry system has the following main components:
• The transmitters
• The body control module (BCM)
• The remote control door lock receiver (RCDLR)--When you press a button on the transmitter, the transmitter sends a signal to the RCDLR. The RCDLR receives the signal and sends a serial data message requesting the appropriate function from the BCM.
• Keyless Entry Antenna which is a coaxial cable that runs from the RCDLR to the back glass. It attaches with a 9 volt battery style connection to a grid on the back glass, this style antenna is used to increase range and performance for Keyless Entry and Remote Vehicle Start systems .

to replace the starter:
1. disconnect the neg. battery cable
2. jack up the car and support with stands (safety first!!)
3. starter is located one the front of the engine
4.mark wiring with a lil paint, (anything) so you know how to put them back on
5. 2 bolts, and it's out!
reverse procedure to install

note: if the car has a remote start, when reconnect the battery cable, starter may engage. have key fob (remote) in hand, to disable the system.

1: Go into AM/FM mode
2: Hit "setup" on the remote control
3: Enter 543210 on the remote, listening for the beep for each number entered
4: A new menu will appear. Touch the button that has the hammer/screwdriver on it in the upper left-hand part of the screen.
5: Select Brake bypass to "ON" and hit the "X" near the bottom of the screen
6. I am not responsible for whatever you do with this code!!!

the problem with this remote is that it is used for a bunch of different models you have to look under the dash and get your unit model number and then check the crime stopper manuals for that units number you do this at www.crimestopper.com under support tab click on manuals and manuals again and then choose the model number you found under your dash

have to be reset by dealer usually 20 to 35 dollars to do so