TMPS reading wrong

[Klinger]

Over the last week I've notice my TPMS sensors for my rear wheels reading wrong.  The right rear has been losing a PSI or two each day, but when I check it with a gauge it's holding steady.  The tires typically read between 35-38 temp depending, but now the right rear is reading 29 on the DIC, but 39 with the gauge.  Left rear is also off by ~5 PSI.  Is there a way to recalibrate the sensors?  Or do I need to relearn the sensors?

[Jay P]

25 minutes ago, Klinger said:

Over the last week I've notice my TPMS sensors for my rear wheels reading wrong.  The right rear has been losing a PSI or two each day, but when I check it with a gauge it's holding steady.  The tires typically read between 35-38 temp depending, but now the right rear is reading 29 on the DIC, but 39 with the gauge.  Left rear is also off by ~5 PSI.  Is there a way to recalibrate the sensors?  Or do I need to relearn the sensors?

How old is the truck or how old are the sensors. They have batteries and don't last forever. The sensors read absolute pressure so elevation will affect the readings (unless you have a high end vehicle). They were never intended to be as good as a good tire pressure gauge, they are there to let you know you have an issue/flat tire.

[Klinger]

My bad, it's a 2021 Silverado LTZ 3.0L.  I have a set on my motorcycle, but when they started failing they just stopped being seen by the head unit.  What I find weird with these is that it's still showing pressure, just significantly lower than whats actually in the tire.

[Jus Cruisin]

Dealers and tire shops have a tool to calibrate the sensors. So, try that first and if still off, then it's time to replace them. 

[GETGONE]

You have to do a relearn if tires are rotated. Someone else had posted the same thing. The pressure was showing off vs a tire pressure gauge and the dash. A tire shop had rotated them and never re-paired them. I swap mine and do the relearn myself but when checking pressure, I always go by the same tire gauge and don't rely on the dash. They aren't 100% accurate and sometimes lag from when you fill them to when they show the updated pressure on the dash. It's supposed to have a "filled" option that will honk the horn when you fill a low tire and it reaches the proper pressure.

[Klinger]

12 hours ago, Jus Cruisin said:

Dealers and tire shops have a tool to calibrate the sensors. So, try that first and if still off, then it's time to replace them. 

That might be what I have to do.  I don't have the tool to calibrate them.

 

6 hours ago, GETGONE said:

You have to do a relearn if tires are rotated. Someone else had posted the same thing. The pressure was showing off vs a tire pressure gauge and the dash. A tire shop had rotated them and never re-paired them. I swap mine and do the relearn myself but when checking pressure, I always go by the same tire gauge and don't rely on the dash. They aren't 100% accurate and sometimes lag from when you fill them to when they show the updated pressure on the dash. It's supposed to have a "filled" option that will honk the horn when you fill a low tire and it reaches the proper pressure.

I get that they may read different, but its the fact that started show progressively lower and lower without a change in actual pressure at the tire.

[GETGONE]

If the tire pressures all show correct with a tire gauge, I wouldn't worry about the sensor unless it's not reading at all and starts throwing a warning light.

[Klinger]

 

On 3/27/2024 at 9:07 PM, GETGONE said:

If the tire pressures all show correct with a tire gauge, I wouldn't worry about the sensor unless it's not reading at all and starts throwing a warning light.

It is starting to show a light sometimes.  I'm not sure if it's because of the delta between that tire and the rest is too great, or if there's a threshold that it dropped below.