TPMS Sensitivity

[wamba2000]

Drove my '12 3.8 this weekend and the TPMS light came on. DId an eyeball ont eh tires and none looked low, but when I got home I put a gauge on each. The drivers side rear was down about 2.5 pounds less than the others.
I thought TPMS was supposed to tell you if you were 5 lbs. or moire off standard.

Topped the tire off and the light went off. Has anyone else experienced such a sensitivity? I'm not complaining, I wold rather know when a tire is low, but my '08 Santa Fe has never thrown a warning and there were times when tires were getting low.

 

[ctrcbob]

You say the drivers side rear was "2.5 lbs less than the others". That 2.5 less is lower than the lower limit the TPMS sending units are set for. You do not have any problem. Just make sure you keep the tires the listed pressure, or even slightly higher.

My TPMS warning came on once for both my rear tires. When I checked them, both rears were down around 29 lbs. Inflated them, (plus the fronts) up to around 32 or 33 and had no more problems.

In addition, when I need to drive to either of my other two addresses, in the winter, knowing that both places are COLD, I inflate my tires up to around 35 lbs, knowing that when I get to the cold area, the pressure will come down. Don't want the TPMS to light up while I'm at either area.

 

[BacktoHyundaibychoice]

I think by law, the TPMS must come on by a 25% underinflation. But with varying systems by manufacturer, most tip you off earlier.
As I recall, Hyundai uses a 10% threshold. So that if you were set at 33, it would come on if you drop below 30. Not sure if I learned that here or from the dealer.
As for visual clues, there really aren't any which is why the OM's always say to check pressure regularly.

 

[wamba2000]

Thanks for the feedback, it is nice to know how the Genesis is calibrated. I have an 08 Santa Fe with over 40,000 miles on it and have never seen the TPMS light except when starting. I have put 5-6 lbs. in when making transition from desert summer heat to mid 60's on fall-winter, but I guess they are les sensitive. Good to know!