I have a 2007 H3, 18 inch rims with 265's. I have about 50K miles on it. About 2 months ago, my TPMS light stareted coming on. I checked the tire pressure in all the tires and made sure that it was the same (34psi cold) in all the tires. Even tried different psi's (30psi, 36psi and 40psi). The light continually comes on. Took it to the dealer, but they don't drive it long enough to recreate the light coming on. Has anyone else had this issue?

 

You can do a search on TPMS threads, but the short version seems to be - run your tires at 38 psi & all should be well.