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X3 F25 (2011 - current)
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  #1  
Old 01-06-2013, 09:16 AM
jac_cal jac_cal is offline
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Tire Pressure Monitor malfunctions in cold weather

This has happened three times now, the TPM indicates low tire pressure and has to be reset. It first happened when I left the X3 outside the garage and it was 37 degrees. I called the dealer and the service guy told me they have the same problem with the ones in their lot. Very annoying.


2008 328i Premium/Sport - 2013 X3 Premium/Sport
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  #2  
Old 01-06-2013, 09:19 AM
noka noka is offline
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Quote:
Originally Posted by jac_cal View Post
This has happened three times now, the TPM indicates low tire pressure and has to be reset. It first happened when I left the X3 outside the garage and it was 37 degrees. I called the dealer and the service guy told me they have the same problem with the ones in their lot. Very annoying.


2008 328i Premium/Sport - 2013 X3 Premium/Sport
What were the measured tire pressures?
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  #3  
Old 01-06-2013, 10:57 AM
02420X3 02420X3 is offline
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It's more likely that the TPMS is operating correctly, rather than malfunctioning. Tire pressure will change by about 1PSI for every 10F change in ambient temperature. Add a little bit of leakage over time to that, and your TPMS is probably going off because your tire pressure is in fact low. Simply resetting the TPMS isn't the solution, as that only tells the TPMS that the current pressure is the normal pressure that you want. Instead, check the (cold) tire pressure with a good quality tire pressure gauge, re-inflate the tires to the correct pressure, and then reset the TPMS.
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Old 01-06-2013, 11:01 AM
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raleedy raleedy is offline
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Originally Posted by 02420X3 View Post
It's more likely that the TPMS is operating correctly, rather than malfunctioning. Tire pressure will change by about 1PSI for every 10F change in ambient temperature. Add a little bit of leakage over time to that, and your TPMS is probably going off because your tire pressure is in fact low. Simply resetting the TPMS isn't the solution, as that only tells the TPMS that the current pressure is the normal pressure that you want. Instead, check the (cold) tire pressure with a good quality tire pressure gauge, re-inflate the tires to the correct pressure, and then reset the TPMS.
Do every step but the last one, and you'll find that the TPMS warning goes away by itself (assuming it was properly set in the first place).
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Old 01-09-2013, 12:58 PM
The X Men The X Men is offline
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Originally Posted by noka View Post
What were the measured tire pressures?
Likely low
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Old 01-10-2013, 02:20 PM
SpaceManGray SpaceManGray is offline
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Quote:
Originally Posted by jac_cal View Post
This has happened three times now
This happens with every car brand I've ever owned with TPM... it's not a malfunction. Cold air has a lower pressure than warm air of the same volume.

The easiest way to see this in action is to leave a half full bottle of water outside over night when the temperature drops. If the lid is nice and tight, the bottle will slightly crumple as the temperature drops and the air inside losses pressure. The same thing happens to your tires.

You need to add more air when the temperature drops dramatically and reduce pressure when summer comes around. The proper pressure for your tires is listed on the side of your driver door cavity. Most gas stations with an air compressor have a pressure gauge on it so you know when you hit the right pressure. This has never failed me and I've never had to reset the TPM system due to temperature changes, although I have had to adjust the pressure in my tires. It only takes about 5 mins to properly resolve.
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