Tire pressure sensor in 2008's

[HUMTECH]

Depending on how much the temp is changing where you live pressures can vary up to 5-10 psi on that size of tire once the tires are warmed up. Try setting them at 42 cold, increased pressure wont turn the light on as they are looking for low tire pressure as long as they all increase even. If it is telling you one tire is way more inflated but they all read the same on a gauge, the sensor that is reading high is fubar and needs to be replaced. Hopefully these systems get better with time cause all vehicles will have them soon.