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Q:

the auto door locks work sporadically. Sometimes they work and other times no, on 2008 Buick LaCrosse

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the trunk always open so we know it isn't the remote.
(2) Answers
Have you checked the motors for the door locks? They are a weak link because they are used frequently. You may want to go to your local auto parts store to pick up a motor manual for your car. It will show you step by step instructions for removing your door panels and anything else you may need to do. Hope this helps. Goodluck
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