Buick Repair Questions? Ask a Mechanic for Answers ASAP
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Are you able to scan the computer system and see if there are any fault codes setting? That would be the next step.
If you can get that done and post back with any fault codes I we can work from there.
Well if the scanner will not communicate I am not sure how to advise you. With out knowing what fault codes there are its leaves me with no place to go. If you would like, I can open the post back up and maybe someone else has some thing new to add.