it's a 2019. The batteries in the TPMS sensors have probably died. Get a TPMS tool or go to a tire shop to verify. They will need to be replaced. The probably should have been replaced during the second set install.

 

I have a 2019 Ascent with 84k on it, have the Subaru Gold Plus coverage good for 8 years or 100k miles. I was having this problem with my TPMS, one tire, right front would not display pressure after a few minutes it would finally display, then a few minutes later full tpms would stop working and orange tire icon would appear on screen with message to check manual. I was due for oil change so I took it in and reported the problem to dealer. They checked it out determined I needed to replace module in right front tire, they covered it under the warranty. Would be nice if the others would fail before the warranty runs out at 100k, will just have to wait and see.

 

I also have a 2019 Ascent. Recently, the TPS light came on even though the four tires were all at normal pressure. It turns out the problem was the spare tire, which was only at 20 psig. Once I fixed the spare, the TPS light did not come back on. This might not be your problem, but I never thought to check the spare until someone mentioned it.

 

It is a great experience to learn from others. I too would never have thought of it. Next time I go into Discount Tire I will have them check the spare tire pressure.

 

The OEM spare does not have TPMS...

 

curious minds want to know dewightrea. Could he have been referring to a non OEM donut spare?