TPS light on in cold temp - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Eski · 01-03-2015, 05:37 PM

So lately here in Northern California it has been below freezing when i have woken up to get ready for work and each day (3 days in a row now) when i start my 2015 brz the tps light is on but all tire pressures are within spec and then once it warms up (outside air temp) the tps light goes away.. Thoughts?

Rota · 01-03-2015, 05:48 PM

When gas is cold, its pressure drops. The air pressure in your tires is directly related to the temperature of the tire. The outside air makes the tire cold and the pressure goes down which turns on the TPS light, but once you start driving they heat up and the pressure rises again to an acceptable level. If the outside temp has been staying pretty low, you probably should add some air into your tires.

Dadhawk · 01-03-2015, 05:56 PM

Quote:

Originally Posted by Rota

When gas is cold, its pressure drops. The air pressure in your tires is directly related to the temperature of the tire. The outside air makes the tire cold and the pressure goes down which turns on the TPS light, but once you start driving they heat up and the pressure rises again to an acceptable level. If the outside temp has been staying pretty low, you probably should add some air into your tires.

Yep, that pretty much defines it. Also, the TPS sensors are not set to the exact air pressure required for your tires, but something well below it. Chances are as @Rota says, you probably need air regardless. The cold weather was just enough to make it drop below the sensor level.

Of the five cars in my family, 4 have sensors and envariably on the first cold day of Fall, at least half of them need air. The FR-S has needed air every Fall.

Eski · 01-03-2015, 05:57 PM

this is what i thought as well. air>gas ratios. it threw me for a loop last night tho when it was cold after dark and dropped down into the 40s and the light never came back on. i have nitrogen in my tires as well so im not sure if i want to add more being that the cold season only lasts about two weeks here in nor cal.

V_86 · 01-03-2015, 07:47 PM

It's the temperature drop. When I used to live in the Midwest, I always had to add more air in the tires, and do it more often, in winter.

ntron1 · 01-03-2015, 09:19 PM

lol @ nitrogen. I'll bet the stealership charged you extra right?

White64Goat · 01-03-2015, 09:37 PM

Rule of thumb is for every 10 degrees in air temp, tires change by 1 lb. Not sure if this holds true for Nitrogen........

Rota · 01-03-2015, 10:43 PM

Quote:

Originally Posted by White64Goat

Rule of thumb is for every 10 degrees in air temp, tires change by 1 lb. Not sure if this holds true for Nitrogen........

The outside is almost 80% Nitrogen so it's close enough.

funwheeldrive · 01-03-2015, 11:32 PM

Quote:

Originally Posted by Eski

So lately here in Northern California it has been below freezing when i have woken up to get ready for work and each day (3 days in a row now) when i start my 2015 brz the tps light is on but all tire pressures are within spec and then once it warms up (outside air temp) the tps light goes away.. Thoughts?

I feel your pain. I've had to fill up my tires twice now this winter. I guess that's the price we pay for never getting snow.

smotonaga · 01-04-2015, 03:30 AM

I had the same thing happen on my Series.Blue ever morning, just fill it up a pound or two and itll go away.

01-03-2015, 05:37 PM	#1
Eski Senior Member Join Date: Dec 2014 Drives: '15 Brz Series Blue Location: Livermore, CA Posts: 541 Thanks: 270 Thanked 344 Times in 186 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	TPS light on in cold temp So lately here in Northern California it has been below freezing when i have woken up to get ready for work and each day (3 days in a row now) when i start my 2015 brz the tps light is on but all tire pressures are within spec and then once it warms up (outside air temp) the tps light goes away.. Thoughts?

01-03-2015, 09:19 PM	#6
ntron1 Sarcastic Bastard Join Date: Apr 2013 Drives: '13 DGM BRZ, '13 Mini, 1999 Blazer Location: Amish Land, PA Posts: 586 Thanks: 341 Thanked 336 Times in 182 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	lol @ nitrogen. I'll bet the stealership charged you extra right? __________________

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01-03-2015, 05:48 PM	#2
Rota Senior Member Join Date: Dec 2013 Drives: 2015 Series.Blue BRZ Location: Chandler, AZ Posts: 100 Thanks: 97 Thanked 63 Times in 37 Posts Mentioned: 10 Post(s) Tagged: 0 Thread(s)	When gas is cold, its pressure drops. The air pressure in your tires is directly related to the temperature of the tire. The outside air makes the tire cold and the pressure goes down which turns on the TPS light, but once you start driving they heat up and the pressure rises again to an acceptable level. If the outside temp has been staying pretty low, you probably should add some air into your tires.

01-03-2015, 05:57 PM	#4
Eski Senior Member Join Date: Dec 2014 Drives: '15 Brz Series Blue Location: Livermore, CA Posts: 541 Thanks: 270 Thanked 344 Times in 186 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	this is what i thought as well. air>gas ratios. it threw me for a loop last night tho when it was cold after dark and dropped down into the 40s and the light never came back on. i have nitrogen in my tires as well so im not sure if i want to add more being that the cold season only lasts about two weeks here in nor cal.

01-03-2015, 07:47 PM	#5
V_86 Senior Member Join Date: Dec 2014 Drives: 2015 Asphalt FR-S Location: SoCal Posts: 304 Thanks: 71 Thanked 83 Times in 52 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	It's the temperature drop. When I used to live in the Midwest, I always had to add more air in the tires, and do it more often, in winter.

01-03-2015, 09:37 PM	#7
White64Goat Senior Member Join Date: Jun 2012 Drives: 13 BRZ CBS LTD MT, 02 WRX Location: Fred. Co. Md. Posts: 2,346 Thanks: 65 Thanked 1,111 Times in 627 Posts Mentioned: 19 Post(s) Tagged: 1 Thread(s)	Rule of thumb is for every 10 degrees in air temp, tires change by 1 lb. Not sure if this holds true for Nitrogen........

01-04-2015, 03:30 AM	#10
smotonaga Member Join Date: Aug 2014 Drives: Subaru BRZ Series.Blue Location: San Jose, CA Posts: 37 Thanks: 5 Thanked 17 Times in 11 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I had the same thing happen on my Series.Blue ever morning, just fill it up a pound or two and itll go away.

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