Tpms
Team Owner
Joined: Sep 2000
Posts: 24,953
Likes: 2,668
From: Far NW 'burbs of Chicago
St. Jude Donor '13
My TPMS have been within 1 psi of my digital gauges, on those occasions when I've checked. But that doesn't mean they are all that good. Many people report they become less accurate at higher elevations, which might apply to you.
Race Director
Joined: Jan 2005
Posts: 10,924
Likes: 851
From: Daytona Beach FL
I looked in your profile to see where you live - but "Arizona" didn't nail it down very close!!
The sensors are very accurate, however the TPMS only reports to the nearest 1.0 psi, or at least that's all the closer the DIC is able to display.
I have a high end TPMS tool and it displays to the nearest 0.2 psi, and it gets the signal transmitted by the sensor to the TPMS, and is virtually identical to my accurate hand held pressure gauge:
HOWEVER.....I live at sea level!!!
The DIC display (and the pressure the TPMS sends to OnStar) will be approximately 1 psi less than your hand held gauge for every 1,000 feet of elevation above sea level.
I bet you live up in Prescott where the elevation is about like Denver - a little over 5,000 feet. That would easily account for 3 or 4 psi less on the DIC than your hand held gauge.
Even Tucson is about 2,600 feet and owners there should see about 2 psi less on the DIC than their hand held gauge.
Bob
The sensors are very accurate, however the TPMS only reports to the nearest 1.0 psi, or at least that's all the closer the DIC is able to display.
I have a high end TPMS tool and it displays to the nearest 0.2 psi, and it gets the signal transmitted by the sensor to the TPMS, and is virtually identical to my accurate hand held pressure gauge:
HOWEVER.....I live at sea level!!!
The DIC display (and the pressure the TPMS sends to OnStar) will be approximately 1 psi less than your hand held gauge for every 1,000 feet of elevation above sea level.
I bet you live up in Prescott where the elevation is about like Denver - a little over 5,000 feet. That would easily account for 3 or 4 psi less on the DIC than your hand held gauge.
Even Tucson is about 2,600 feet and owners there should see about 2 psi less on the DIC than their hand held gauge.
Bob
Last edited by BEZ06; Nov 6, 2012 at 06:39 PM.
