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On my 2020 2500 AT4 with 9,200 miles, I’ve had the batteries die on me once and been sluggish to turn over several times. I just noticed that my truck WiFi is stuck on, even after I’ve let the truck sit for over a day. Is that the battery drain I’ve had? Is it supposed to shut off when the truck is off? 

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You may try pulling the onstar module fuse or disconnecting the battery(s) to get the module to reset.

 

You could also measure the mA draw on the battery with and without the fuse.  Make sure you let the truck sit for 5 minutes or so after close the doors to make sure the other modules have gone asleep.

 

A dealer could hook up a scan tool and watch the various modules shutdown and see which one does not.

 

#iworkforGM 

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