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Gmc app unlock not working. Sleep mode?

Scott Voorhees
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Scott Voorhees New Member

Scott Voorhees

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Hi all 

2 days ago we arrived from vacation after a 6 day trip. Parked my 2018 sierra at the airport. When we returned I tried to unlock using the app and failed. We had to call roadside service for a lockout. Onstar couldn't get it to unlock on their end either. Said it was in sleep mode. WTF?. I've never had this issue before. Has anyone ever heard of this?

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