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I am curious, at what pressure will the TPMS fire up a warning signal that you have a "flat" ?

Mine triggered today at 27 psi, but I found no nails or any other puncture in any tires. I will be bringing my MO to the local GoodYear dealer for them to check the tires out tomorrow.

Just want to get a feel for what you guys have experienced.
 

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Doesn't signal a "flat". Signal is for underinflated tire. 27psi sounds about right.
 

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My aftermarket TPMS is designed to signal when pressure falls 5 psi below the set pressure. I am assuming the OEM is the same way. So if tires have to be at 33, then 27 or 28 is when the alarm will sound.
 

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Mine signalled at 27 and it said it was flat. I reinflated to 34 and the message went away. Must have been that winter air I had installed in March!
 

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Yup, 27. I remember it being so cold this past winter that it thought all my tires were flat when I got going in the morning :)
 
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