Tire Pressure Sensors...

[cpaul]

So...... I went with 37's on 20's. Looks good....but the air pressure light is on due to the big *** tires only needing 40PSI and the sensors are set at 60. Any body got any knowledge on how to reset that?

[Eagle 33]

a tire shop or your local dealer should be able to reset the parameters of the TPMS

[cpaul]

What ya think thats going to cost me?

[smotrs]

Actually, the TPMS isn't adjustable and the tire shop's won't be able to change it. This is assuming your setup uses the bands that go inside the tire as introduced in 2008 model SD. Supposedly, some of the newer trucks have it on the valve stem and it works differently.

[Eagle 33]

if it isn't adjustable how have we changed it on our ambulances at work?

[smotrs]

You haven't described how you "changed it", so I don't know. The way the bands work is by simply relaying the current pressure to the computer and the computer determines whether the PSI is within range. If they are you don't have a problem but if they are out of range then the light is tripped. On some trucks the range is larger then on other trucks, not sure if it's a percentage or actual values. Some people have gone to a different PSI tire and haven't had a problem, others going with the same tire do. The only ones typically not having a problem are those that get new tires that have the same PSI rating as the pillar sticker calls for. Everyone else has to either inflate/deflate their tires to compensate or deal with the light.