[Balr14]

The temperature has dropped around here in the last few days, It had been in the 60 - 75 range, now it's low 50s. I am now getting low tire pressure warnings with pressure showing 25 - 27psi per wheel. However, when I check tire pressure with several very accurate gauges and a Milwaukee tire inflator, they all show it is 30.5psi. The last time I got a low tire pressure warning, there actually was a tire that was a little low. However, the tire pressure shown by TPMS matched exactly to what my gauges and Milwaukee tire inflator showed.

So, I'm inclined to believe the TPMS is wrong. I don't know if it is related to the temperature drop, or simply a coincidence and I don't know what to do about it. My car only has 14k miles and the tires have 3k miles.

[StanDiego]

Originally Posted by Balr14

The temperature has dropped around here in the last few days, It had been in the 60 - 75 range, now it's low 50s. I am now getting low tire pressure warnings with pressure showing 25 - 27psi per wheel. However, when I check tire pressure with several very accurate gauges and a Milwaukee tire inflator, they all show it is 30.5psi. The last time I got a low tire pressure warning, there actually was a tire that was a little low. However, the tire pressure shown by TPMS matched exactly to what my gauges and Milwaukee tire inflator showed.

So, I'm inclined to believe the TPMS is wrong. I don't know if it is related to the temperature drop, or simply a coincidence and I don't know what to do about it. My car only has 14k miles and the tires have 3k miles.

The only thing I can think of is the TPMS read the pressures cold and you read them after the tires warmed up?

[BlankProc]

Originally Posted by Balr14

The temperature has dropped around here in the last few days, It had been in the 60 - 75 range, now it's low 50s. I am now getting low tire pressure warnings with pressure showing 25 - 27psi per wheel. However, when I check tire pressure with several very accurate gauges and a Milwaukee tire inflator, they all show it is 30.5psi. The last time I got a low tire pressure warning, there actually was a tire that was a little low. However, the tire pressure shown by TPMS matched exactly to what my gauges and Milwaukee tire inflator showed.

So, I'm inclined to believe the TPMS is wrong. I don't know if it is related to the temperature drop, or simply a coincidence and I don't know what to do about it. My car only has 14k miles and the tires have 3k miles.

Did you do the TPMS reset procedure following refilling the air?

I had to reset my TPMS yesterday following filling my air after a big seasonal drop in my wife's 5 series. You then drive it around for a mile or two and it should reset and show the correct values.

[Balr14]

Originally Posted by StanDiego

The only thing I can think of is the TPMS read the pressures cold and you read them after the tires warmed up?

No, I checked the tires immediately after getting the message and displayed the TPMS reading immediately after checking the tires. The discrepancy was still present.

Originally Posted by BlankProc

Did you do the TPMS reset procedure following refilling the air?

I had to reset my TPMS yesterday following filling my air after a big seasonal drop in my wife's 5 series. You then drive it around for a mile or two and it should reset and show the correct values.

I will give that a try.

[Balr14]

Starting with a cold car, air temp 52... I checked tire pressure with my inflators... all 3 said 31 - 32 psi on every tire. TPMS said 27psi on 3, 25.5 on 1. I did the reset and drove until it completed. TPMS now showed 29 on 3 tires, 28.5 on 1. Inflators still read 32psi. I guess I'll live with it, unless I start getting those messages again.