RDFTS

iTrader: (1)

Weather has dipped into the teens (F) and was driving down the highway this morning when all of a sudden the TPMS warning came on. I pulled over in about 5 minutes to take a visual look, tires look fine. Is it common for the TPMS warning to come on during cold weather? I do plan on stopping and checking with guage and air soon.

justjimmy

I would imagine that the cold weather would have an effect.

I live in Florida so I don't get the cold temps like others but this past weekend we went ATV riding and the temps went down to the low 40s. The gas cans all but collapsed.

So... yes, I'm sure that's what happened.

johnwill

Maybe a leak in a tire???

Lacrosseman812

Do u have nitrogen in the tires or normal air with normal air I had same problem in my Yukon during winter but they were fine

bj973

Yes. Pressure is proportional to temperature. As the temperature decreases, the pressure goes down.... for the same reason there are temperature warnings on aerosol cans.

A general rule of thumb.... 1PSI for every 10 degrees.

jgmac98

Temperature does affect pressure, but tires don't go from full to flat because of it (in Calgary temperatures can go from +30 to -40 degrees C). I've never had a problem with TPMS before, but this is my first winter with my Ford. If you have Nitrogen in your tires (green cap on the stem) then temperature has next to no affect on pressure.

HomeBrew

I've had this happen now every year for about the past 4 years when we get that first really cold night. I don't think it changes drastically, maybe a pound, but if you are already on the limit the sensor will trip.

CorvetteDreamin

Yep, normal. Wouldn't worry about it. If the thing is driving alright, you should be good to go. You'll know when you have a problem. And pretty quickly too.

Lacrosseman812

I can't Remember the exact pressure the tires on Yukon ran but during winter the pressure dropped about 10psi

RDFTS

iTrader: (1)

Okay, worked a 14 hour day so finally got to a gas station with an air pump. All four tires were at around 25psi!! I filled them up to 35 and the light went off. Wow, 10lbs low all of sudden, huh? It was in the upper teens/low 20's this morning but warmed up to the 40's and was 41 when I put air in tonight.

When does the TPMS light come on, after 10psi low? My previous Dodge was nit-picky at 2psi variance but 10 with Ford, that can't be right?

Time to RTFM?