Tire pressure warning light

[rcarolla]

Tire pressure warning light appears on my 2005 tc.

It appears to be random.
I check tire pressure all around.AOK.
Reset the light.Same thing happens about 2-3 weeks later.
Repeat above. etc.

Any ideas?

Thanks

Ron

[StreetBrawler89]

New rims or tires?

Also where do you live, are you using an aftermarket radio unit, are you broad casting radio out of yor car at all, and did you use tire chains this past winter?

[SquallLHeart]

you need to re-initialize the light... not just clear the light..

check pressures.. and HOLD the reset button down until the light blinks 3 times..
you didn't do that before did ya?

just held until light went away?

[rcarolla]

Thanks.I will try that next month when I get back to the car.We live on an Island,and the car is on the mainland.

Again.Thanks for the speedy reply.
If that is in the user's manual,I guess I did not see it.

Ron

[SquallLHeart]

yea.. it's in the manual somewhere..

[Jay666]

you need to re-initialize the light... not just clear the light..

check pressures.. and HOLD the reset button down until the light blinks 3 times..
you didn't do that before did ya?

just held until light went away?

He's right, you have to actually hold the button in a few seconds to reset the memory to accept the current air pressure as an "acceptable" or "desired" pressure to the computer.

There is a very simple and quick explanation in the manual like he said. I had to do this about a month ago when I took my car out of winter storage.

[ericers]

Mine tends to come on in the morning when it's cold. It normally goes back off after the tires have warmed up.

[CadenceScion]

The only time I get that light is when I change from my OEM wheels to my aftermarket ones. Once in awhile it cuz my tire pressure is low. Just open your glove box and find the black button. Turn the key to the access position and hold for 5-10 seconds, the light will go off. I have found out that some people have gotten that light if they have a wheel that is out of balance as well. The sensors are kinda picky, but nothing to worry about.

[Jay666]

Could be a problem with your rim.

I had this problem with the light coming of for the longest time. The tire pressure would go down, but not all the way. Was clearly slowly leaking somewhere slowly, just could not figure out where or why. Bought new tires, same issue.

Turned out there was a slight bend in my rim due to the awesome moon landscape like Chicago potholes. Could not see it with the naked eye, but once I happened to get the car up on a lift, filled the tires all the way, put the car back down on the ground and for some reason this forced the air out to a more noticeable point more so than just filling the tire with air when it was already on the ground. This allowed me to pinpoint exactly where it was leaking, and when I rubbed my finger on the rim, I could feel an ever so slight bend in the rim. Not noticeable, but was allowing air to very, very slowly leak out, and only to a certain point, not going completely flat, but the light would come on and the tire would stay at around 25-30 psi.

I had to replace that rim, even though it looked brand new still. Found a cheap replacement slightly used TRD one at a junkyard in CA. In fact, that had a ton of them in stock in various conditions.

[supaman86]

it could be where you live remember that density can change do to volume an increase in temp volume increase, ie tire pressure in the summer, but in the winter the opposite is true decrease in temp decreases volume thus a constant variation in temp can cause the tire sensor to misbehave

[navylife59]

Very true. This is one of the main reasons to utilize Dry Nitrogen over atmospheric air. It's volume/pressure ratio is less sensitive to temperature changes. It also has the benefit of zero moisture (corrosion) and less sublimation through microscopic holes in the tire sidewalls (pressure bleed down).