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Have a new body 2007 Sierra 1500. The other day my TPMS service system came on while driving. When I checked I had 1 tire low. Aired it up and the service system warning wouldn't go off. Tried the remote lock/unlock routine and only got the initial 2 horn beeps. No tire would cause horn beep on deflation. Went to a tire dealer today and their tool couldn't get any tire to recognize. They said all 4 must be dead. I find it odd that all 4 went out at once. Is there a fuse or relay that controls the system?

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