Thanks for your question. Sorry you're having car problems. If I go off line, just leave a message and I'll be right back. DO NOT leave feedback yet.
Due to the oddity of this problem, brings up this TSB from Buick regarding water intrusion in a connector. I attached the TSB for you to view. Keep me posted please. Thanks, Ron
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Thank you, Ron
Please note: not every answer I give you is something you were hoping to hear, even though it is true, such as; (it's more expensive than you wanted to spend, or you will need to have a professional repair shop do the diagnostics and /or repairs due to complexity reasons).