TPMS Question

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Oct 30, 2020 | 11:55 AM

Maxpowers

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Le Mans Master

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From: Toronto

TPMS Question

This just started happening...

When my car has rested for 24 hrs +, the OEM sensors read 28 psi at startup. As soon as I drive for 20 seconds they go to 30 psi. This isnt from heat given the short timeframe. As the sensors get older do they go into some kind of sleep mode?

My second set of wheels have aftermarket sensors and they go into sleep mode after 24 hrs.

Im not concerned... just curious.

Oct 30, 2020 | 09:49 PM

eseibel67

Racer

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From: Goderich, ON

I dont know definitely, but I have a guess. Yes, all sensors go to sleep to save the battery and rotation wakes them up. Temperatures have been colder overnight lately. The car has knows the ambient temp when the car was shut off as well as when the car restarts, so your 28 PSI is a guess until the sensor wakes up and accurately reports 30 PSI.

Last edited by eseibel67; Oct 30, 2020 at 09:50 PM.

Oct 31, 2020 | 01:08 AM

FX VETTE

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From: The Steel City, Colorful Colorado

Winner 2020 C7 of the Year - Modified

As the tires warm up, the TPMS temperature goes up. No biggie

Oct 31, 2020 | 11:40 AM

Maxpowers

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From: Toronto

Quote:

Originally Posted by FX VETTE

As the tires warm up, the TPMS temperature goes up. No biggie

Thx but I thought I was clear in my msg. It occurs after 20 seconds. No chance heat plays a role, especially given we are in the 40's these days.

Oct 31, 2020 | 05:15 PM

eprest1983

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How old are the sensors?

Nov 1, 2020 | 09:04 AM

Maxpowers

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From: Toronto

4 years old

Nov 1, 2020 | 10:30 AM

eprest1983

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I wouldn't think the batteries are bad yet then.

Nov 1, 2020 | 10:38 AM

Mad*Max

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From: Toronto, Canada

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Quote:

Originally Posted by Maxpowers

T. As the sensors get older do they go into some kind of sleep mode?
.

In all my years of driving cars with TPMS, I have not noticed any change in their behaviour as the car ages (save when the battery starts to go then there is erratic behaviour