same here... i repair one of my tires yesterday with a tire repair kit and just found out that other tire was leaking too... all 5 tires are at 35 psi and light still on.. did a 2 or 3 miles run and didnt turn off

 

Well then I'm not crazy, when zeppo said that it doesn't read the spare I had a hard time buying it because it had to be reading my wifes spare. If the sensor is putting out a signal it should read it, unless of course the spare has a plain black rubber valve stem which means it has no sensor in it to read.
I would think the TPMS in the Libby and the JK are the same system.
Zeppo, what's the source for your info that it doesn't read the spare?
To the OP, check your spare just for the hell of it if you haven't already.

 

I think it takes a little longer than that to reset. Have you driven it any more to try to get it to turn off?

 

I just had this issue today. My spare was low & the sensor came on. Put air in all my tires & the light is still on after driving abot 15 miles. Hoping it goes off rather than have there be a problem with the system...

 

My source is the 2010 owners manual. If the owners manual happens to be incorrect my apologies for the bunk information. I just assumed that was the next best source for info on the operation of the system since I don't have access to a manufacturer technical spec sheet. By all means give the spare a shot but that shouldn't be the problem.

 

I had the same problem.

Here was my solution:

I bought a digital tire pressure gauge to get an EXACT reading on all 5 tires. Aired them all to 37 and voila! TPMS light went off within 30 miles of me driving. It ended up being my spare tire throwing it off. Hope this helps you like it helped me.

 

Well for all I know it could have been a coincidence that the light went off after filling the spare up to the correct PSI. These Jeeps and their computer systems like playing mind games I think.

 

Yup. The 2008 to 2011 Owners Manual says "A low spare tire will not cause the "Tire Pressure Monitoring Telltale Light" to illuminate or the chime to sound."

Yet it does. This is why I think it triggers the system:

There are accelerometers embedded in the sensor that detect motion and "power up" the TPMS. I suspect what is happening is a series of bumps is enough to turn them on, and since this is a "dumb" system (doesn't detect WHICH wheel, just that one is low), the sensor fires off a "I'm low on pressure" signal. Once a sensor has reported low pressure, I believe THAT sensor has to report good pressure. That's why it took 30 miles to finally turn off the alert once the spare was inflated - the Jeep had to be driven under the right conditions to trigger the spare sensor.

The interesting thing is the system is expecting 4 sensors to contribute, so if the spare is removed the system does not go off, assuming the 4 mounted ones are at the right pressure and the spare didn't already trigger the alert. That's probably what the owner's manual is trying to say.

That is how it works on my JK. I've tried several scenarios and it is consistent with the explanation above (OK. I was bored and needed something to do).

 

Well I found it funny that my wife can drive 80+ miles one way with it on and 80+ miles back with it on and as soon as I fill the spare to the proper PSI it goes off after driving it a little way.
She was correct about all four on the ground being up to the correct PSI,.....well when she checked them they were up to 36 PSI after driving but when they're cold they're at 33, so it couldn't have been her 4 tires on the road setting it off.
Coincidence, who knows? I think as a little experiment I'll lower the pressure in the spare and drive it to see if it sets it off again.

 

Thanks all, I have not had any tire work done and did check the spare, It is colder this week so i will bump them up a little more and see what happens