Tire Pressure warning at 35psi?

[KelEddy]

We had our first couple days of cold weather in Dallas which caused my TPMS Warning to come on showing 29psi in each tire. I inflated all to ~35psi and I'm still getting the warning 24 hrs and 50 miles later. Is there a reset on this?

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[Ducati1098]

Do you have sasquatch? Because if so they're supposed to be set at 39, so 34/35 could potentially register a low tire still. I can't remember where the warning is set from the factory.

 

[CarlSpackler]

I would run my badlands 33"s down to 33 psi with no warnings and the door tag on those is 39psi recommended, unless its the wrong door tag. Which after looking at the speedo might be the case.

 

[KelEddy]

Do you have sasquatch? Because if so they're supposed to be set at 39, so 34/35 could potentially register a low tire still. I can't remember where the warning is set from the factory.

2021 Bandlands non-sas. I've always run around 33-35psi. It's weird if you look at the picture that 1 tire at 35psi doesn't have a warning, but the other 2 at 35 do.

I think I'll give it another day to see if it goes off.

 

[Ducati1098]

2021 Bandlands non-sas. I've always run around 33-35psi. It's weird if you look at the picture that 1 tire at 35psi doesn't have a warning, but the other 2 at 35 do.

I think I'll give it another day to see if it goes off.

Yeah mine does something similar sometimes, it's weird.
If it doesn't reset on its own after another day, any dealership should be able to reset them with a special tool.

 

[Lucky Nut]

Had the same thing happen earlier this winter. I was wondering if there was a reset and just forgot to look it up. Then one day the warnings magically disappeared. Currently my tires are running 31-32 psi and no warnings at all

 

[TheKim]

When I'm off-roading and messing with inflation, the light doesn't usually turn on until I'm under around 30 psi, and doesn't turn off until I fill up to 36. I recommend bumping them up 36, and I bet it turns off.

 

[userdude]

This is what happens with mine: I like to run around 35psi. I don't get warnings precisely at 32psi; I don't even get them at 31psi (with the cold weather this week, had three at 31psi but only one in warning). They will all get back to 35psi, but the one in warning will not go away right away. So I think what's happening is the psi shown is an approximate/rounded number, but the computer is looking for a combination of say 31.5psi for a period of time, plus 35.5psi for a period of time, before turning on/off the warning per tire. Or something thereabouts. This has happened several times and is annoying, of course.

 

[Ducati1098]

I would run my badlands 33"s down to 33 psi with no warnings and the door tag on those is 39psi recommended, unless its the wrong door tag. Which after looking at the speedo might be the case.

I thought non sasquatch used to be 35, but maybe they changed something.

 

[Brian_B]

Try airing up to about 40. Start the car and drive down your driveway and back. Then when the light clears you can drop back down to 35. The computer just needs some margin over what it considers normal to clear.

You can try pulling the battery cables to reboot everything, or clearing the DTSC code - both would force clear it and since you aren’t 15% low anymore it shouldn’t come back in… but I think overfilling it just a bit to clear and coming back down may be an easier path.

I don’t think a dealer would do anything different.

Or you can change the warning value in Forscan.

 

[AK SNO RIDER]

When I'm off-roading and messing with inflation, the light doesn't usually turn on until I'm under around 30 psi, and doesn't turn off until I fill up to 36. I recommend bumping them up 36, and I bet it turns off.

This is what I came in to say. They trigger at a lower psi than they clear, so if you run on the lower end of the "acceptable" range, you'll need to air above the clear sp then down to your preferred value.

 

[Brian_B]

The computer is supposedly set to equal the pressure on the door tag. That isn’t the warning pressure though, it’s “Recommended” cold inflation pressure. The warning is supposed to come in 15% below that value, and clear when you get back above. It also rounds … so if you are at 34.8 and the setting is 35 — it will show 35 on the dash but it isn’t high enough to clear in the computer yet.

Also keep in mind most tires will gain 2-3 psi once they warm up from driving around.

 

[KelEddy]

Thanks everyone. I'll give it a shot

 

[dgorsett]

My F250 won't reset until I drive over 50 mph for a bit.

 

[DefNotBuddyLee]

When I'm off-roading and messing with inflation, the light doesn't usually turn on until I'm under around 30 psi, and doesn't turn off until I fill up to 36. I recommend bumping them up 36, and I bet it turns off.

This right here. When I air down no alert until in the 20s. However, alert generally doesn't clear until right at 36. Then I can air down a bit to 33-35 if I choose with no new alert. I would normally assume a target pressure would trigger the warning, but someone decided to use many lines of programming when a couple would have worked.

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