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2017 GMC Acadia - Lights won't shut off

Lights will not turn off and battery goes dead over night.

It is possible that you are still in the 3 year 36000 mile warranty . If that is correct then see your dealer or any GMC dealer.

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What lights ?

If headlights, I’m thinking maybe a stuck relay - but could be off base.

Of course if it’s under warranty, let a dealership figure it out.

Bad BCM?

https://moduleexperts.com/5-common-symptoms-failing-body-control-module-bcm/

Tester

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If it’s the interior lights, could be a faulty door switch. Try pressing/jiggling the driver’s door switch, see if that has any effect. It’s usually the driver’s switch that fails first.