TPMS reading high

[tomservo92]

I noticed the other day that my TPMS display was showing 37psi on all tires so I decided to lower the pressure to 35. When I checked them, they were all actually at 33 so I aired them up to 35. However, the display still says 37. I went for a 1 hour drive and the PSI went up to 39 when the tires got hot but is now back to 37. What's going on with my TPMS? The last time I checked the pressure (via the display) was a few weeks ago and it was showing 35. I'll admit I don't much about TPMS but I can't imagine all 4 malfunctioning at the same time. Any thoughts?

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[Skye]

Your vehicle is listed as a 2015. Are those the original, factory sensors? Aftermarket? Thanks.

 

[The Demon]

This happens on my 2019 all the time. I never trust the dash reading. I check them every week with my portable tire inflator which is very accurate.

 

[twbthird]

The TPMS sensor readings do not seem to update in real time. The ones on my car also consistently read 2 PSI higher than my tire gauge.

 

[tomservo92]

The TPMS sensor readings do not seem to update in real time. The ones on my car also consistently read 2 PSI higher than my tire gauge.

Up until now, it's always been pretty close to what I get with a digital gauge.

 

[tomservo92]

Your vehicle is listed as a 2015. Are those the original, factory sensors? Aftermarket? Thanks.

They're original, I can't find my receipt but I'm pretty sure Discount Tire did a TPMS rebuild when I bought tires last year.

 

[Skye]

FWIW, mine are a bit off sometimes, but never more than +/- .5 psi, .035 bar from what my handheld gauge says. These are Ford OEM units, in aftermarket rims. Mine do tend to display higher than actual, not lower.

I was thinking with age, temperature cycles and all that, they could lose some accuracy, but this is just a thought. I have no proof to confirm.

 

[tomservo92]

FWIW, mine are a bit off sometimes, but never more than +/- .5 psi, .035 bar from what my handheld gauge says. These are Ford OEM units, in aftermarket rims. Mine do tend to display higher than actual, not lower.

I was thinking with age, temperature cycles and all that, they could lose some accuracy, but this is just a thought. I have no proof to confirm.

That could be. The damn things are nearly 8 years old after all. Even with a rebuild they might be getting to end of life. I guess I'll just keep an eye on the situation with gauge checks for now.

 

[tomservo92]

I did a little research on the ol' interwebs and the consensus seems to be that the lifespan is 5-12 years so I'm dead-nuts in the middle of that.

 

[Cordero1]

The only thing I've learned about TPMS lately, is that they're a pain in the ass. Thought about buying that bypass box, but haven't decided yet.

 

[Ramairetransam]

19 gt here and mine are off by 2 psi compared to my nice liquid filled gauge. i guess my nice gauge could be off too.

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