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Old 08-08-2012, 05:39 PM   #1
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Join Date: Jul 2012
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TPMS questions

I bought new wheels and tires from DT about two weeks ago. For a 2012 JK BTW, and yes, I did pay DT for the TPMS sensors.

They were delivered at 35psi cold, I installed them and drove around for about 3 days at 35 psi, it felt a bit bouncy at 35psi so I aired down to 32 psi, about three days later the TPMS light came on. I checked and they were still at 32psi. Yesterday I aired them back to 35psi to see if the TPMS lamp would go out - it hasn't. I just checked, they're all still at 35psi with the TPMS still on.

I assume DT will take care of this but I still have a few questions out of curiosity.

Does the tire have to be removed from the rim to replace the sensors?

Is there any way for me to tell which sensor is faulty?

How do they work? Wired, bluetooth, RFID, magic?

How often does the signal send? I mean if I get a legit TPMS light and refill to normal pressure does the TPMS light shut off right away?

Is there any way to "reset" the system? Like maybe disconnect the battery for a few minutes or something?

Thanks for any help

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Old 08-08-2012, 06:06 PM   #2
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Centrifugal force turns them on. Around 32 psi or so seems to be the trigger point, at least on a 2012. The '08 and '09 have the same frequency, the '10-'12 share another. They are not interchangeable.

Since air gauges aren't perfect, you can air them up to 40 and the light should go out fairly quickly. While the manual says something like 15 minutes of driving, my experience has been that the light should go off with a few blocks.

The system on the Jeep is automatic, you don't need to go to the dealer for reprogramming. There is (supposedly) a tool that will wake one up and read it, the dealer supposedly has one. A rookie tire jockey can ruin a TPMS sensor.

We did about 5000 miles in the last two weeks and one of the jeeps in our group had a slow leak. The light came on about every 500 miles, or ~31 psi. FixAFlat didn't help, so we just used our compressor and filled it as we went (up to around 40). That vehicle was a rental, so theyt can sort it out.

Yes, you need to pull the tire, break the bead, then you can replace the sensor.

If you like the ride at 30 (below the Jeep threshold), you can buy a $150 procal that will change that threshold to 25 psi or disable it all together.

Hope this helps.

Get DT to fix it, perhaps they ordered and installed the wrong sensors.



















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Old 08-08-2012, 07:49 PM   #3
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If you want the TPMS to go out you have to set the PSI to whatever is on the sticker on the edge of your door,
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