Tire Pressure Warning Light Question... Cold Weather?

hdpt00 · 11-06-2008, 12:14 AM

Live in Arizona where it's hot to say the least. Tonight was the first real cold night, about 58 degrees compared to the usual 85+ ambient in the garage.

Girlfriend took it out tonight around 6:30pm, got back to the car around 8:30pm and the pressure warning went off. I went to the gas station and all of them had the same pressure, about 25psi... I filled them up to the recommended 32 and the light went off.

Is this most likely caused by the first time it's been in such a cold temperature and it might have been filled to 32 during a hot ass day?

Just being a bit paranoid, car is a week old, don't want to be shelling out $300/tire just yet. Didn't see any nails on first inspection...

wuufer001 · 11-06-2008, 06:24 PM

got the opposite as you,
was drove to CA and on the way back passed AZ and the warning light came on, parked at the side and check and everything seems normal. called the BMW tech and they said the high temp caused the warning light to go off because of the heat.
so i guess with cold weather it's also possible.

TT3 iN NyC · 11-06-2008, 06:41 PM

Quote:

Originally Posted by hdpt00

Live in Arizona where it's hot to say the least. Tonight was the first real cold night, about 58 degrees compared to the usual 85+ ambient in the garage.

Girlfriend took it out tonight around 6:30pm, got back to the car around 8:30pm and the pressure warning went off. I went to the gas station and all of them had the same pressure, about 25psi... I filled them up to the recommended 32 and the light went off.

Is this most likely caused by the first time it's been in such a cold temperature and it might have been filled to 32 during a hot ass day?

Just being a bit paranoid, car is a week old, don't want to be shelling out $300/tire just yet. Didn't see any nails on first inspection...

This actually happened to me last week when I took the car out to get some dinner. It was around 45 degrees out and as soon as I got in the car the TPMS light came on and the pressure read 25 psi when I went to the gas station. I think its normal to loose some air when the weather gets cold. I did some research when I got home and found out that its best to put air in the tire when its cold out. You get the more accurate of a reading. Oh yea and inflate it to about 34 in front and 35 in the back since the tires will loose pressure due to the lower temperature. Hope this helps.

hdpt00 · 11-06-2008, 07:39 PM

Thanks.

It sat overnight and no warning today. Think it was just the weather.

Blue Streak · 11-07-2008, 03:37 PM

It's definitely the weather, or temperature specifically. These tires really fluctuate in air pressure based on driving conditions and the outside temperature. You just don't want your tire pressure going up over 40 psi (rear) or under 32. It will jump that much psi in a day or over night easily. You need to simply get yourself a decent pump and an accurate guage to check them periodially. I keep my psi at 32-34 (front) and 36-38 (rear).

White e90 · 11-07-2008, 03:41 PM

same thing happened to me here on our first cold day...just reset the tpms...keep an eye to be safe..but no worries..its all good

Orient330iNYC · 11-07-2008, 04:00 PM

Quote:

Originally Posted by White e92

same thing happened to me here on our first cold day...just reset the tpms...keep an eye to be safe..but no worries..its all good

you shouldnt reset without checking the air pressure. resetting just sets the current pressure to the new baseline, ie: if your tires were at zero, the system will reset, but your tires will still be dangerously underinflated.

Firefly6 · 11-07-2008, 04:08 PM

Quote:

Originally Posted by White e92

same thing happened to me here on our first cold day...just reset the tpms...keep an eye to be safe..but no worries..its all good

Same here - on the first cold morning of autumn. All tires were equally a little underinflated. Just added some air that's all.

11-06-2008, 12:14 AM	#1
hdpt00 Private 12 Rep 99 Posts Drives: Mo-Ped Join Date: Oct 2008 Location: Earth iTrader: (0)	Tire Pressure Warning Light Question... Cold Weather? Live in Arizona where it's hot to say the least. Tonight was the first real cold night, about 58 degrees compared to the usual 85+ ambient in the garage. Girlfriend took it out tonight around 6:30pm, got back to the car around 8:30pm and the pressure warning went off. I went to the gas station and all of them had the same pressure, about 25psi... I filled them up to the recommended 32 and the light went off. Is this most likely caused by the first time it's been in such a cold temperature and it might have been filled to 32 during a hot ass day? Just being a bit paranoid, car is a week old, don't want to be shelling out $300/tire just yet. Didn't see any nails on first inspection...
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11-06-2008, 06:24 PM	#2
wuufer001 Colonel 403 Rep 2,348 Posts Drives: 2006 E90 M/T Join Date: Mar 2006 Location: DFW, TX//Taiwan//South Africa iTrader: (5) Garage List 2006 325i [9.34]	got the opposite as you, was drove to CA and on the way back passed AZ and the warning light came on, parked at the side and check and everything seems normal. called the BMW tech and they said the high temp caused the warning light to go off because of the heat. so i guess with cold weather it's also possible. __________________
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11-06-2008, 07:39 PM	#4
hdpt00 Private 12 Rep 99 Posts Drives: Mo-Ped Join Date: Oct 2008 Location: Earth iTrader: (0)	Thanks. It sat overnight and no warning today. Think it was just the weather.
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11-07-2008, 03:37 PM	#5
Blue Streak Gunny 31 Rep 623 Posts Drives: '07 E90 335i 6MT, 2016 F10 535 Join Date: Sep 2007 Location: San Diego, CA iTrader: (0) Garage List 2007 E90 335i [9.00]	It's definitely the weather, or temperature specifically. These tires really fluctuate in air pressure based on driving conditions and the outside temperature. You just don't want your tire pressure going up over 40 psi (rear) or under 32. It will jump that much psi in a day or over night easily. You need to simply get yourself a decent pump and an accurate guage to check them periodially. I keep my psi at 32-34 (front) and 36-38 (rear). __________________ 2007 E90 335i 6MT, ZSP, Nav, PDC, CA, Montego Blue, Terra Dakota leather, CDV, clutch-stop, E46 M Shift Knob, Logic HVI, JB4 PnP, MS 3" downpipes, Koni Yellow adjustable sport shocks, RE 12mm(f)/BMS 15mm(r) spacers, Blacklines, LUX 5.0 LED halo ring lights, DAEOS (Vista) harness, GP Thunder 7500k fogs, 35% sides-20% rear tint, matt black kidney grill, matt black 335i trunk badge
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11-07-2008, 03:41 PM	#6
White e90 Lieutenant 17 Rep 487 Posts Drives: AW E90 M3 Join Date: May 2008 Location: NY iTrader: (3)	same thing happened to me here on our first cold day...just reset the tpms...keep an eye to be safe..but no worries..its all good
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