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2021 Silverado just tinted and door lock remote don't work


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I only had that issue on a 2019 Escalade using ATR film. Funny thing is I had no issues with the 2018 which is essentially the same vehicle. Swapped the film out to CTX. Proximity sensor worked.

I've probably done a dozen 2021 Chevy Silverados with high performance film with no issues.

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I have had a few issues with the new GMs.  CHARGE THE BATTERY! Service guy says that these are the absolute worst on needing a battery to be fully charged for everything to function properly.  This is most likely your issue.  

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