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Unread 12-27-2012, 02:32 PM   #1
badrich94
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Question TPMS in cold weather

So we drove our '12 summit in the snow for the first time this past weekend and Xmas. I was curious about how the tires would perform so I kept the tire pressure monitor turned on. I keep my tires at 36psi and was curious how low it would go. TPMS usually has it go up to 38psi once I get going on the road. In any case, the TPMS system never showed below 38psi. It was 19 degrees outside. Does anyone have funky performance with the TPMS in cold weather? I am worried, because what if I started to get a flat tire, I wouldn't get notified...

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Unread 12-27-2012, 03:32 PM   #2
97HMCS
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Sounds normal to me. If you are driving (especially at higher speed) the tire pressure will be normal even in cold weather.
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Unread 12-27-2012, 04:24 PM   #3
lysol
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Funny you posted this. My tires actually dropped from driving in the snow yesterday by about 5 psi each. That was most of the day driving in snow and slush at around 25 degrees outside. I wouldn't worry about it too much. You could always air one down and watch it. then air it back up.
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Unread 12-27-2012, 04:41 PM   #4
badrich94
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Quote:
Originally Posted by lysol View Post
Funny you posted this. My tires actually dropped from driving in the snow yesterday by about 5 psi each. That was most of the day driving in snow and slush at around 25 degrees outside. I wouldn't worry about it too much. You could always air one down and watch it. then air it back up.
I'm just worried that it doesn't work correctly in cold weather. When I checked the tires manually, they were at 33psi. TPMS never went below 38psi. It's like it was stuck or something.
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Unread 12-27-2012, 06:34 PM   #5
ColdCase
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Were you by any chance driving at high altitude?

The only time I've noticed my tire pressure drop is when its been setting for awhile. I never have seen it drop while moving... unless I had a leak... regardless of outside temperature. I suppose if you were moving slow enough and the outside temperature is dropping you may see some tire pressure drop.

The TPMS seems to be accurate at sea level. It will indicate lower pressure than gage pressure at altitude. You may get a sensor bad every now and again, but not all four at the same time. the only place there is anything mechanical that could stick is within the tire sensors themselves. Everything else is circuits and software.

How accurate is that mechanical gauge you are using? Do you know how its accuracy changes with temperature?
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Unread 12-28-2012, 11:57 AM   #6
badrich94
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Quote:
Originally Posted by ColdCase View Post
Were you by any chance driving at high altitude?

The only time I've noticed my tire pressure drop is when its been setting for awhile. I never have seen it drop while moving... unless I had a leak... regardless of outside temperature. I suppose if you were moving slow enough and the outside temperature is dropping you may see some tire pressure drop.

The TPMS seems to be accurate at sea level. It will indicate lower pressure than gage pressure at altitude. You may get a sensor bad every now and again, but not all four at the same time. the only place there is anything mechanical that could stick is within the tire sensors themselves. Everything else is circuits and software.

How accurate is that mechanical gauge you are using? Do you know how its accuracy changes with temperature?
Yes, I was at 6200 Feet in Lake Tahoe CA. I used a digital guage and also an old fashhion guage to measure manually. At sea level I have always seen it either go up or down depending on what is going on. It's working fine now so if I take it in, they won't find anything....
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