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Old 10-02-2009, 07:56 AM   #1
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Low tire pressure indicator on- brand new 09 jk

Got into my car this morning...first day with frost on the windows and the low tire pressure indicator turned on - tires look fine.

Car has about 400 miles on it now, 23b package.

Any insight on this would be great..

Thanks

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Old 10-02-2009, 08:01 AM   #2
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Uh, put some air in your tires. Changes in temperature can affect psi. They may look ok, but not have enought air. Check the inside of your door for the correct psi.

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Old 10-02-2009, 08:01 AM   #3
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Leave your pressure alone. The light will go off as you drive and warm the tires up.
Tires pressure changes a lot. The idiot gauge cant cover everyting from 115 degree days to 20 below weather.

It really only works great in the middle.

Don't worry about it unless it is happening when its 75 outside.

When you lower your tire pressure to drive on the beach it will be on all the time.
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Old 10-02-2009, 08:17 AM   #4
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^^^ What he said. Cold air in the a.m. will do it every time. Check to make sure they are all within a few lbs. of each other, and all will be fine.
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Old 10-02-2009, 09:10 AM   #5
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Will do - Thanks!
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Old 10-02-2009, 09:28 AM   #6
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also c if ur spare has a montior. i went crazy on my gf liberty tryin to find out why her light was on. check all the tires twices. it turned out tht the spare had a sensor too. if the light stays on after driving for awhile and the others r good it the spare.
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Old 10-02-2009, 09:56 AM   #7
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Yep chilly weather will set it off.
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Old 10-02-2009, 12:09 PM   #8
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Also it's not just a Jeep thing. All the new cars with the manditory indicators do the same thing.
On some vehicles the indicator light can be very bright and distracting or anoying.
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Old 10-06-2009, 10:32 AM   #9
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Thanks for the replies.

I checked my tires and they are the right PSI..the light is still on, however.

Do I have to manually reset it after that cold day set it off?

I've driven about 20 miles since.
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Old 10-06-2009, 10:35 AM   #10
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What psi do you run and be sure they are all the same...
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Old 10-06-2009, 10:50 AM   #11
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says to have it at 35 psi..

2009 wrangler 2 door
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Old 10-06-2009, 10:56 AM   #12
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This should be OK..be sure they are all the same..

Also, get a second reading with another pressure gauge..
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Old 10-06-2009, 11:01 AM   #13
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Did it with 2 gauges..haven't checked the spare, however, and I heard they might be on the sensor.

What should I do if they all measure correctly at 35 PSI?
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Old 10-06-2009, 01:28 PM   #14
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Check the spare, then call the dealer if you must.... May have a bad sensor.
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Old 10-06-2009, 01:51 PM   #15
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ill bet its the spare it wont warm up like the rest when you drive but still loses psi in the cold
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Old 12-29-2010, 06:26 PM   #16
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Fluctuating Tire Temps & Pressure/TPMS Warning

FWIW: I solved the problem by going to a Nitrogen charge on all five (5) tires on my JK. The spare was the culprit until I had it filled with Nitrogen, too.
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Old 12-29-2010, 06:37 PM   #17
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There is no advantage to using nitrogen.
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Old 12-29-2010, 06:39 PM   #18
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We had a real bad cold snap here in Denver last year...mine stayed on for days.
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Old 12-29-2010, 06:42 PM   #19
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The spare will not set off the TPMS alarm.

You should of course keep your spare properly inflated, but the TPMS doesn't monitor any tire that's not rotating.
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Old 12-29-2010, 08:18 PM   #20
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Yeah my sensor went off on the coldest morning this season.
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Old 12-29-2010, 08:35 PM   #21
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The spare will not set off the TPMS alarm.

You should of course keep your spare properly inflated, but the TPMS doesn't monitor any tire that's not rotating.
But, but, but....... When it goes off first thing in the morning when you start the Jeep, none of them are rotating....... They're just sitting there.
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Old 12-29-2010, 09:09 PM   #22
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But, but, but....... When it goes off first thing in the morning when you start the Jeep, none of them are rotating....... They're just sitting there.
Because the sensor sends a signal as soon as you start it, or unlock it with the remote. It sends a signal while driving every 60 or 90 seconds, while it is turned off and sitting, etc etc.
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Old 12-29-2010, 09:16 PM   #23
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Because the sensor sends a signal as soon as you start it, or unlock it with the remote. It sends a signal while driving every 60 or 90 seconds, while it is turned off and sitting, etc etc.
So then how does it discern the 4 on the ground from the one on the gate?
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Old 12-29-2010, 09:18 PM   #24
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Is there any danger of the light being on all the time, other than not knowing if you really do have a low tire. I just installed new tires and rims on the JK, and they don't have the sensor's in them because I didn't swap them. I wonder if the computer will go crazy if the bulb burns out??
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Old 12-29-2010, 09:25 PM   #25
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Of course there is no danger. A visual inspection will show you if it's TOO low. All this crap was brought on by the Ford/Firestone fiasco. Any REASONABLE person is gonna see or feel a tire problem before it is a REAL problem.
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Old 12-29-2010, 09:27 PM   #26
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Quote:
Originally Posted by pato1031

Because the sensor sends a signal as soon as you start it, or unlock it with the remote. It sends a signal while driving every 60 or 90 seconds, while it is turned off and sitting, etc etc.
Interesting. The manual says that the spare will not trigger the TPMS, but provides no explanation as to how this is so. The only explanation I've ever heard is that the sensors detect the rotation, and only the signal from rotating tires is registered.

Thus, as to Inferno's point, my understanding was that the computer had already determined what sensors to register based in the last time the Jeep ran, and it simply reregisters those sensors upon start up. In the event you've rotated in your spare, you'd have to drive for a little while to persuade the computer to stop registering one sensor (the new spare) and start registering the tire you rotated in. For that brief time, the spare could trigger the TPMS. Otherwise, it will not.

Is that not your understanding Pato?
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Old 12-29-2010, 09:30 PM   #27
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Originally Posted by terminator012
Is there any danger of the light being on all the time, other than not knowing if you really do have a low tire. I just installed new tires and rims on the JK, and they don't have the sensor's in them because I didn't swap them. I wonder if the computer will go crazy if the bulb burns out??
Isn't there a steering wheel dance you can so to shut the system off entirely? If not, I bet you can shut it off with a AEV ProCal or something similar.
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Old 12-29-2010, 09:34 PM   #28
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Isn't there a steering wheel dance you can so to shut the system off entirely? If not, I bet you can shut it off with a AEV ProCal or something similar.
It's my understanding that it can't be shut off, but the threshold can be set to zero, effectively shutting it off.
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Old 12-29-2010, 09:49 PM   #29
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Trying to find it so I can post a link for you all to see. Dealerconnect is down so it might take me a little while.

CheckMyTires - Tire Pressure Monitoring Systems
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Old 12-29-2010, 09:58 PM   #30
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I know for a fact, that my last vehicle's TPMS was set off by the spare. I always check the 4 on the ground, but who checks the spare? Every change in season, which isn't much in FL. my alarm would go off. I"d have to lower the spare and climb underneath to set pressure.

Jeep made it easy. Put the spare on the back.

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