former50

Ok, so I checked my dash indicator for tire pressure and they read 37LF, 38RF, 36LR and 38RR. A check of the door jamb indicate that they should all be at 30 LBS. So I take out my trusty digital air gauge and they read, 24.5 - 27 lbs....WTF? I air them up to 30 lbs by my gauge, start the car and they still show the above pressures? Now what? Anybody deal with this?

Yellow C-6

Sounds like you need to have your Sensors reset, you should be able to run by a tire shop and get them to set them for you.

EVRose

It is not as accurate as a tire air gauge but it it shouldnt be that far off. Mine are within one pound of a gauge. You will need to drive a bit before tpms registers a difference after putting air in.

dpigguy

You need to drive the car for a while then check DIC readout. If still high, have dealer or tire shop reset for you. My dash reads about 2 lbs less than actual.

BEZ06

When the car sits still for more than 15 minutes the tire pressure sensors go into a sleep mode and only transmit once every 60 minutes to save their battery life.

When you start driving faster than 20 mph the sensors wake up and transmit once every 60 seconds.

So....after increasing the pressure you should drive the car at faster than 20 mph for a few minutes to let the sensors wake up and transmit the current pressure to the TPMS computer in the car.

Bob

Rich Mickol

Mine on all three C6's have always been within a pound or two of my tire gauge.

ProfessorDeath

Mine are just about spot on. You shouldn't be that far off. As the others have said, it's a pretty quick and easy fix to reset them.

former50

That clears things up. I was playing with them in my garage, didnt drive after. Will do so tomorrow, thanks.

corvetteflier

Both my '06 and the '13 read 3# low consistently. I understand it is the altitude here, 7000', which causes it. I have two digital gauges to check and the 3# low has never varied, hot or cold weather. My '12 CRV doesn't break it out by tire on its TPMS, but I had a low light come on once, which would have been about 26# on the Honda, checked the tires with the gauge and it read 29 on one, slightly lower than the 31 called for but not enough to set the warning light. Confirms altitude does come into play when it is this high. At highway speeds, the Vettes both read 31-32 which is consistent with 34-35 for hot tires on the highway.

dvilin

dennis50nj

with everything that's been said, but your trusty air gauge could be off

HOXXOH

I have 5 gauges and only 3 read exactly the same. One is 3# lower at 30psi, but I know that and compensate.

Boomer111

My disc in my 08 shows what three different manual air gauges read. Within 1/2 lb psi anyway.

Mine tpms seems to like a high side reading of any particular number when filling.

CyberGrayGS

This is really good info to know. Thanks for posting it.

diitto

Mine too..

I've checked mine against two manual tire gauges and they are very, very close. As others have said, it sounds like your sensors need to be reset...

TerryL

Mine seem to be spot on in my 06 vert.

Red08

I have compared the sensor reading to a tire guage, and the two are typically withing 1-2 psi of each other.

Ryan5508

all 4 of mine read only 1 psi higher than a tire gauge

Mad*Max

the TPMS in my car are fairly accurate and like someone posted you need to drive the car a bit to register the new tire pressure

LS WON

30 PSI on Accu Tire guage and 28 on TPS.