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Tire Fill Alert


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I have a 2020 GMC 2500HD equipped with the tire fill alert system. My tire pressure was 5 to 10 lbs low in all of my tires according to the tpms info screen. I have not received any low tire pressure alerts. I started the truck and began filling the tires. No lights came on and the horn did not beep at me when I reached the correct tire pressure. Of course the dealership is clueless. Does anyone know if you have to first receive a low tire pressure alert before the tire fill alert system is engaged? If not, anyone have information on how to engage the tire fill alert system? The manual does not give any guidance, it just describes what it is supposed to do when you are adding air to the tires.

As always, I appreciate everyone on this forum!! Thanks!

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