Buick Lacross will not start in park,but start in neutral mode.
Also when door will not unlock the vehicle stuck in park mode.
Its a common issue of faulty shift linkage.Causing Gear Shift Issues.
Looks like your shift linkage is out of adjustment or the shift position switch is faulty and its not sending out the correct signals of the gear shift position to correctly control the door locks nor allow starting in park.
See the image shown below for shift linkage possible faults:----
These details Will help.Thanks.
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