TPMS PSI isn't accurate

[rydfree]

Crazy how there's so much variance.

After filling to cold 30 on all tires, driving around for 20+ min, my TPMS now show: 33,33,33,32
So it looks like they're all working the same (there's probably less air in the 32 tire legitimately), but all are 3 over what it should be.

If you drove around for 20 minutes then the tires are warm and will read higher . The 32psi is probably just under a half psi off . I think it rounds to the next number .

Mine read 30-30-30-30 until i ride awhile then they show 32-33 also .

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[atari]

Mine are off by a couple PSI too, I think, I can't say for sure because have no idea which is correct, the TPMS, my own gauge, or the one at the gas station?

Reminds me of a saying my grandfather had: "a man with two wristwatches never really knows what time it is..."

Ohh for sure. I figure if two of my guages are the same, that has to be accurate... at least that's what I'm going with

 

[atari]

If you drove around for 20 minutes then the tires are warm and will read higher . The 32psi is probably just under a half psi off . I think it rounds to the next number .

Mine read 30-30-30-30 until i ride awhile then they show 32-33 also .

Sorry. I filled to 30 (guage). Truck showed 35, 32, 34,33

Drove for 20 minutes.

Now after sleeping (so fully cold again) they're all 33,33,33,32

 

[MXGOLF]

My Ford App is usually a few pounds off. You are supposed to measure when the tire are cold. The pressure will always rise when in use a bit or hot weather probably would do it too.

 

[BillinPCB]

My TPMS has always read 5-6 psi higher than measured with a tire gage.

 

[WingShot]

Mine reads 2-3 PSI higher then what I read with a guage. I just monitor the TPMS for changes, it’s relative. Same with MPG readings.

 

[Refiner]

I know that cold pressure and after driving around for a while can be up to 5psi different. In the summer it tends to get the tires warmer when driving and in turn has a higher pressure in the tires.

 

[Hounddog409]

Crazy how there's so much variance.

After filling to cold 30 on all tires, driving around for 20+ min, my TPMS now show: 33,33,33,32
So it looks like they're all working the same (there's probably less air in the 32 tire legitimately), but all are 3 over what it should be.

Um, you do know that cold pressure and "warm" are not the same? 33 sounds right after driving 20 mins

Tire when in use warm up....pressure goes up.

This is why recommend pressures are always listed as "cold".

 

[atari]

Um, you do know that cold pressure and "warm" are not the same? 33 sounds right after driving 20 mins

Tire when in use warm up....pressure goes up.

This is why recommend pressures are always listed as "cold".

Yes. There was 12 hours between the driving and giving those Numbers.

 

[grizzly]

I have a good tire pressure gauge and mine is spot on.

Always check my tires when they are cold (haven't been driven for a couple of hours) and all tires are in the shade or sun.

 

[awd.nv]

I noticed the cold PSI in the sensors seems to be about 1-2psi higher than actual but eh, close enough to do the job it is there for. I checked two gauges and these gauges also match what my '16 Honda Pilot reports.

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