TPMS/actual psi differ?

[navyflyer]

TPMS shows 40, actual shows 32-33….what gives? Any suggestions/input how to fix?

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[GO_RV]

Mine matches exactly
i should add. Here how is I know.
I remove my caps and put a Tireminder TPMS a on my Jeep when I pull it behind my motorhome. They were at 38 PSI on the JEEEP's TPMS and 38 PSI on the Tireminder screen in my motorhome.

 

[falcon241073]

Have you driven it before checking. Mine is sometimes showing the last reading from when I parked the Jeep. It’ll be high as air expands as it heats. Once I drive the Jeep a tiny ways it’ll get a fresh cold reading and be spot on. Usually after it’s sat overnight after a long drive where it’s reading 34-36psi instead of the cold 30psi it really is. Once I start down the street the dash will then show 30psi.


I hope that confusing crap I just typed makes sense.

 

[Carolina Jeeper]

What falcon241073 said is what I've seen too. The TPMS reading only updated while the Jeep is moving.
Makes kind it useless if you have a low tire and must begin driving to discover the low air pressure.

 

[R3TRO]

Yeah I noticed this too... Turn on Jeep and shows previous reading. Then a few minutes later a 'new' reading is updated. But to answer your question mine is usually spot on once the current reading is displayed.

 

[navyflyer]

Thanks all! I didn’t know it operated that way, I’ll go check it out.

 

[jludave]

The TPMS reading only updated while the Jeep is moving.

Not true. When the vehicle is first started, it will show the last value read before the vehicle was shut off. The TPMS values will update as you are filling up each tire or as you are driving. I use the TPMS page nearly every time I add/remove air from my tires.

You can see how they change while airing up here:




You can see the left rear tire pressure change from 17 to 18.

 

[falcon241073]

Not true. When the vehicle is first started, it will show the last value read before the vehicle was shut off. The TPMS values will update as you are filling up each tire or as you are driving. I use the TPMS page nearly every time I add/remove air from my tires.

You can see how they change while airing up here:




You can see the left rear tire pressure change from 17 to 18.

I should have added that. Actively adding or removing air will update the tpms. If I remember I’ll test how long it takes to update with the Jeep on without moving it or adjusting the psi. If it even will. But that will be Thursday evening. Unless someone else wants to test?

 

[Carolina Jeeper]

Not true. When the vehicle is first started, it will show the last value read before the vehicle was shut off. The TPMS values will update as you are filling up each tire or as you are driving. I use the TPMS page nearly every time I add/remove air from my tires.

You can see how they change while airing up here:




You can see the left rear tire pressure change from 17 to 18.

Sorry to disagree but I've done this on mine many times and it never updates until I drive mine. I've aired them up when cold to 35 psi and no change appeared on the screen until I drove it.

 

[Rhinebeck01]

Sorry to disagree but I've done this on mine many times and it never updates until I drive mine. I've aired them up when cold to 35 psi and no change appeared on the screen until I drove it.

Depends on model year of the JL, what one sees behavior wise in regard to this TPMS stuff.

 

[Carolina Jeeper]

Depends on model year of the JL, what one sees behavior wise in regard to this TPMS stuff.

Appears to be the case.

 

[navyflyer]

Not true. When the vehicle is first started, it will show the last value read before the vehicle was shut off. The TPMS values will update as you are filling up each tire or as you are driving. I use the TPMS page nearly every time I add/remove air from my tires.

You can see how they change while airing up here:




You can see the left rear tire pressure change from 17 to 18.

TPMS is working fine, aired them down and watched as it updated tire pressures, turns out I had a bad gauge…whoops! My bad. Appreciate the input.

 

[Vinman]

Sorry to disagree but I've done this on mine many times and it never updates until I drive mine. I've aired them up when cold to 35 psi and no change appeared on the screen until I drove it.

My 2021 Rubicon screen updates as tire pressure increases just like the video.

 

[JJMalone]

If your TPMS disagrees with your gauge, the gauge is most likely wrong. My experience with TPMS is they are accurate (liability issues). Remember the Firestone Roll overs on the ford SUVs a while back. That is why the low pressure alarm is set with any tire <30psi and it takes aftermarket programmers to change. The dealer will not do it.

 

[Carolina Jeeper]

My 2021 Rubicon screen updates as tire pressure increases just like the video.

I wish my did that but they never have in almost 3 years of owning it. Must be an update since the 2019 models.

I recently replaced my tires to a mud terrain tread and had to lower air pressure several times looking for the correct pressure for tire patch contact. The display will stay locked into the pressure from the last time I drove it no matter what i do with the ignition or refreshing the display. Believe me I've tried. I always have to drive my Rubicon about a mile to see any changes and it's not all of them at the same time. They update to the current pressures in a seemingly random way.

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