i know we've circled the wagons around the Tire pressure (TPMS) issue a couple of times but the "low tire" message has reared it's ugly head again. In fact, now it's every ignition cycle and on the 4th repair they even replaced the sensors from another stock adventure series H3. So, it's been a few months and I wanted to know if there was any new advice out there or any new fixes I can tell my service advisor? It's a Advn. 07 H3 w/ 4K miles and it's been a pressure issue for 4months now... gone repeated times to the dealership and can't seem to keep the TPMS consistent and quiet... is there a "Best" practice out there for air pressure 32? 35psi? Mainly used for freeway driving during the week with occasional dirt road use on the weekends.

 

i thought it needed to be 40psi to keep that away

 

I went up to 36 on mine. It seems like whenever it dropped below 34psiit started going off. The label on the door says 35psi cold and 50psi cold on the spare.

But with temperatures dropping now this time of year, so are the pressures of your tires.
Here is your science lesson of the day....
Air pressure and Air temperature are directly proportional thanks to the gas law.
p1/t1 = p2/t2 (using degrees kelvin and pressure in atmospheres)

So if youfilled your tires at 70 degrees to 35psi and your sensor goes off at 34psi,if the air temperature drops below55 degrees, your TPMS will start going off. If your numbers are different, roughly for every 15 degree drop in temp, you lose 1 psi.

I'd say let your truck sit outside overnight and if you dont have a compressor of your own, drive slowly to the closest fill station. Fill it to 35 or if you drove more than 5 miles, fill em up to 37.

 

Yep, mine started going off when it started getting down into the 40s at night. Just added more air and haven't had a problem.

 

I found that 37 PSI was my magic number. I also get a little better gas milage around town. I tried 40 for a while, but that was too rough of a ride. I've been airing down to 20 PSI for off-roading that requires traction on rock faces and it seems to work pretty good. Don't forget to keep the spare at 50 PSI or the light will come on. If you do your own tire rotations, be sure to follow the instructions in the owner's manual so the computer can keep track of the tires.

 

i have to rotate mine this weekend,i am hoping it all goes smoothly

 

It's pretty straightforward. The rotation pattern is on page 382 of the owner's manual and then follow the TPMS sensor ID code matching procedure on page 379. This way, the sensors are matched to the new tire position.

 

i didn't realize the spare influenced the TPMS? I'll have to check it.

 

Yeah, who knew? I guess it makes sense. No use in dragging around an extra tire and wheel if it's flat. I wonder why the spare takes 50 PSI instead of 35? Maybe it's so the TPMS knows which tire is the spare.

 

i think the weight of the truck adds some kind of pressure in side the tire.maybe it just fools the system that way