Yesterday on the way home from work, the tire pressure warning light came on as I exited the freeway. 2008 Rubicon unlimited , stock tires and wheels. I found a place to stop and checked the tires. All visibly ok,couldn't hear a leak. So I drove home the two miles to my house. This morning came out to check tires. With a gauge, all at manufacturers suggested pressure. Drove the Jeep, sensor lite out.
My question - does the sensor read high pressure as well as low? Trip home from work is about 22 miles at freeway speed (pre rush hour so 60 -65mph).I know the tires will gain pressure from the heat. I'm just curious if sensors work on high as well low pressure.
Or was it just a glitch that went away when Jeep was shut off?

 

Not in my experience, I took my TPMS out, so can't try it. I would second guess the pressure gauge (they are notoriously off) and double check the pressure you are saying is "normal" is what is on the driver's door jamb...and NOT whats on the side of the tire.

 

Several times I have seen my TPMS warning come on for no reason. Tires all checked good each time.

There is no mention in the service manual about any kind of warning for high tire pressure.

If your tire pressure is listed on the door frame sticker as 37 psi,
the warning light comes on when the pressure drops to 29 psi, and goes out when it is raised to at least 34 psi.

 

Don't mean to hijack the thread, but what happens when you take out your TPMS? Does the truck start displaying error codes, or beeping, or what? I'd quite like to remove the sensors on my 2010 Rubicon. My dealer (who I don't think knows a heck of a lot and can't be bothered finding out) says the computer's TPMS function can't be turned off.

 

Yes you get a light..UNLESS you run one of the two? (hypertech or superchips - what i have) tuners to turn the light off. Make sure to reenable the TPMS light and remove the 'tune' before returning it to the dealership..or they will know you've messed with it.

 

I had a slow leak in one of my front tires & the TPMS lamp would flash and the chime would ding quickly for 10 seconds or so & then the lamp would either stay fully lit or go out. This was even though the leaking tire was at like 35PSI, so it was either warning me that the pressure was slowly dropping, or that it was lower than all the other tires that were at 40PSI.

Didn't notice anything in my owner's manual about this. When I air down for affroad the TPMS alert doesn't kick in 'till about 28PSI.

 

air pressure fluctuates with ambient temperature so if you are right on the limit with your current air pressure sometimes that will make the light come on and go off. no it does not read high air pressure.