Splan8

Just an FYI for all:
After Hurricane Ivan passed through GA, my TPS tripped and stayed on until my tires warmed up. Adding air this time of year in GA is common.

-Splan8

Soundave

Same thing happened to me this morning. Althoughwe don't get hurricanes here in the bay, the weather went all crazy yesterday. My TPMS light stayed on for about 8 minutes and then it was gone.

Kain

get used to it. it will happen all the time this winter

rx8cited

Stock tire pressure is 32 PSI cold. According to the
Tire Pressure Monitoring System Service Tips document, the TPMS light will come on if any tires' pressure is below 26 PSI or above 49 PSI.

Assuming the TPMS is working as described in the document, ambient temperature would have to drop more than 60 degrees from the last time the tires were set to 32 PSI cold to account for the tire pressure dropping more than 6 PSI to below 26 PSI and making the TPMS light turn on.

So this leaves me to wonder if people don't check their tires frequently enough, correctly, sensors are bad, or what? One possibility is that the tires are not being set to 32 PSI cold. Here's a good article from Tire Rack on Air Pressure.

I've never had my TPMS light turn on either set of TPMS sensors (winter / summer wheels) and I check my tires every 2-3 weeks.

rx8cited

Splan8

Yeah, I'm guessing it was closer to the lower number (26 psi).

Can spirited driving or break-in cause tires to "relax" thus reducing actual tire pressure?

Ophitoxaemia

air leaks out of tires through the rubber.

low temp will decrease the pressure in the tires, so in the morning when they are cold the light may be on. driving on tires heats up the air inside and then it expands, increasing the pressure so the light may go off.

james

Kain

this is EXACTLY what happens. if you live in a cold climate you will see. even though I rarely drove my 8 last winter I still dealt with this all the time- it is just interesting when the light does nto go off and you have been driving on a really low tire while thinking it was just a "cold" tire

arattle

Yep, got the same problem - yesterday morning the light came on, I got a little scared, checked all tires, all seem fine. Got to work, in the afternoon the light was off, I guess the temperature went up about 20 degrees. Same problem this morning, going to check tire pressure at lunch and see which one needs a bit more air. Also, I don't believe that air leaks through rubber, the pores in rubber physically aren't large enough to allow oxygen or nitrogen molecules to pass. Otherwise we'd have no air in the tires at all, other than contaminant molecules. The leaks usually occur through the tire/rim interface or the valve stem and joints.