I had to have mine recalibrated or "reflashed" yesterday. I went to the sand dunes last weekend and let the air down to 12 lbs and then pumped them back up aftwards and the low tire message was on. I work at a GMC dealership and used the new Kent Moore J-tool to reset the system several times and it would not reset. Finally I took it to my Hummer dealer and they fixed it in about half an hour while I waited and so far it has not come back on.
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