Unexpectedly today after airing each tire down to pop a bead and then airing up (added BBs) … going on a test drive, the TPMS light was lit but it went off within a couple seconds of me reaching 20-30 mph. I never had this happen unless maybe why getting new tires last year it did the same thing, but we attributed that to the tire shop mixing up my plainly marked wheel's positions. Curious, I looked in the book, on page 217 it says:

I'm guessing the light came on because the sensors had registered a zero psi condition, or was it because I rolled them further into my shop away from the truck? I wonder.

Anyway, the are OEM sensors that have just over 70,xxx miles since 2007. Good batteries I guess.

edit 09-27-20:

Riddle solved. Today I found a low tire on a DD car, pulled around to my "shop apron" to air it up and check others and I noticed the gauge on my inflate gun with attached gauge was resting on 10 psi, not zero. I started comparing with other tire gauges, both dial & pencil types, it was off by a bit over 9 psi, just a gnat's hair from 10 psi. After finishing the car, I pulled the '07 around to check it too, all tires were exactly the same and 10 psi below where I knew that I set them after putting the BBs in which was a precise 42 psi indicated (as I intended to go back in a few hours and recheck for any sign of leakage). Oddly enough, the dial gauge on my inflator was soon back on zero and reading correctly before I finished readjusting my tires, but I know NOT to trust it blindly in the future.

I reset all 4 at 40 psi using two other gauges to adjust down after adding air using this same inflator gun (which in spite of it's reading in error, is equipped with a lock on stem end and it moves air fast, for like seating beads). I have run this truck at 40 psi cold since 2009 when I bought it, tires always wear very well, but I will bump it to 45 if hauling a load or anticipating a long day on the road.

I know the door sticker on my truck says 35 psi, I know I have OEM type & size tires too. I don't know what the "threshold" is for setting off a low tire warning via TPMS, but if I left here with 32 psi and a warning but the warning went off in under 1/2 mile, I wonder if that little bit heated the tires enough to do it?

I thought it felt a little fuzzy in some curves yesterday, kinda "rode softly".

edit 09-29-20:

Yesterday (28th), it rode & drove better in curves, but I can feel small roadway irregularities more too. Tires are still smooth though, no balance induced vibrations.

Tripped over 71,000 miles too.