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Originally Posted by Linus Gump
That is for tire rotations. It tells the TPM where each sensor is. For whatever reason, it nees to know this for proper monitoring.
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yes but i had this problem and this is what i did and I never got the warning again? Except when i got a flat tire. Im no hummerguro but i dont think this truck keeps track of the spare tire pressure. Im going on the fact that i was driving around when i got the truck and there was no air in the spare. It never went off. Also whoever said inflate the spare to 50psi is wrong your tire pressure doesnt go down when there is a load. If anything it might go up a little. Its like if you sqeeze a blood pressure cuff while its full it wouldnt go down it goes up cause air pressure goes up.