Hello Shey....OBDII is EMC/PCM controlled...you may have a possible computer issue. I've encountered some real strange intermittent issues with the LaCrosse. It is often difficult... if not impossible to trouble shoot on-board computer control devices without bench test equipment and even then they can test out okay but not perform properly. First off, as the battery is at the heart of the electrical system check that your battery has good voltage (check battery with a volt meter or better yet load test the battery) Check the starter wiring for good connections. Check the starter relay and neutral safety switch/ make sure there is oil in the crankcase and then check to make sure the engine manually turns over ( (spark plugs removed hand crank the engine over by placing a socket and wrench on the crank pulley nut to rotate engine. If all checks out you may be forced to do the dreaded replace parts solution which often results in spending more money and time than Dealer service.
SOURCE: I cant find the fuel filter on my 05 buick lacrosse
The problem more than likely is not a fuel filter problem,Its sounds more like an ignition problem.
SOURCE: My remote won't start my 2005 Buick LaCross. I
Both my remotes no longer work. I will be ordering new ones off Ebay and having my dealer program them. New ones from Buick are very pricey.
SOURCE: Buick Lacrosse DVD System unlock code
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!!!
SOURCE: 05 lacrosse when starting it will dies
I found the fix with help from dealer with no charge I forget what the part is called but follow air intake line to top of engine disconnect it- their is a butter fly here that sticks when dirty all you have to do is is get some cleaner from parts store and clean build up out mine runs great now
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