Whoa, Nelly... Friendly reminder

If your back tires were down to the 30s, why didn't your TPMS light come on? You might want to reset it after you get your tires pumped back up.

 

I usually stop at either the Discount Tire Co and have them fill my tires or I do it myself at a gas station. I always have them overfilled to 40 all around and adjust them the next morning to factory specifications (found on the label in the drivers door ledge). That way I adjust the tires when they're cold, if you set them to desired pressure when they're warmed up from driving (driving to the tire place to get them filled) then the pressure will drop when the car sits, especially ouside in the cold. Tire pressures are supposed to be measured when cold, therefore you are probably not running quite as high of a pressure as you may think you are. I noticed last year when the first cold of winter hit my low tire pressure light came on and when I checked them they were all exactly 5 psi low each just from the outside drop in temps.

 

It is my understanding the TPMS is designed to alert you when pressures fall 5-8lbs below where it is set. So, if you're going to run your tires higher than recommended (40lbs), then reset the TPMS at that new pressure and it alert you when they fall to 32-35lbs.

Reset is easy. After filling the tires, put the vehicle in ready mode, depress and hold the brake pedal and press and hold the TPMS button at the bottom of the dash until the indicator on the dash blinks then goes steady. Release the button and the brake pedal but keep the vehicle on for a few minutes to allow the TPMS to read and memorize all 4 wheels.