First off, my OEM sized tires are 265/60x18 and inflated to 35 psi confirmed with several gauges. Digital and pencil.

If it's 90+ degrees out, I get a TPMS light after about 30 min and the tires have increased pressure from the heat to 39psi. Even after sitting overnight, the nag light flashes for a minute in the morning and stays on all day.

On cooler days like today, low 80s, the light goes off.

Does this system respond to higher pressure as well? I can borrow a scanner and check for codes if TPMS sets any.

???

Weekender.

 

From what I have been told, yes. I do believe too much pressure can click the light on.

 

Well, the weather has turned mild for now and with daytime temps in the low high 70s, low 80s and nights in the upper 60s.

The TPMS light has gone off. Tire pressure is still 34psi cold as read with three different gauges. So it's definitely an ambient temperature related thing. I have a short commute, only 15 minutes, so I might go run longer this weekend to see if it comes back after 30 min.

Not a fan of nanny electronics, I'll be taking that TPMS lamp out when I pull the cluster to replace the odometer lamp.

Weekender.