TPMS-it's not just for low tire pressure

Theo426

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So I learned something interesting at Wake The Dragon-TPMS warning will activate with pressure INCREASES too.

My drives on Tail and other roads were the hardest most aggressive I've had to date in my Type R and twice I got "Low tire pressure" warnings and both times all 4 tires were fine BUT warm tire pressure was 40 psi all around (cold tire pressure for my Goodyear Eagle All Seasons is 35 psi).

Anyone else have this experience?
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So I learned something interesting at Wake The Dragon-TPMS warning will activate with pressure INCREASES too.

My drives on Tail and other roads were the hardest most aggressive I've had to date in my Type R and twice I got "Low tire pressure" warnings and both times all 4 tires were fine BUT warm tire pressure was 40 psi all around (cold tire pressure for my Goodyear Eagle All Seasons is 35 psi).

Anyone else have this experience?
I had this happen in my EXT coupe. Last fall I went on a road trip and my light came on due to over pressure. I assumed low pressure and added more before I got to a air pump with a gauge and found it over pressure. Lessoned learned, now I keep a pressure gauge in the car since TPMS can go either way.
 

CivicChina

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my friend's new CRV was delivered with extremely high tire pressure and the light came on after some driving.
 
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Theo426

Theo426

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I had this happen in my EXT coupe. Last fall I went on a road trip and my light came on due to over pressure. I assumed low pressure and added more before I got to a air pump with a gauge and found it over pressure. Lessoned learned, now I keep a pressure gauge in the car since TPMS can go either way.
Yup-I just got a gauge to keep in it...
 

dmitri

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Makes perfect sense, as TPMS works by determining the differences in relative wheel rotation. So technically that "Low tire pressure" warming message should really read "Different tire pressure"... :)
 


Dragon Systems

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Well... this thread answers a question I did not want to waste anyone's time to ask, thank you :)
 

BirchyBoy

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Funny, I just posted about having this issue in both of my ‘17 Civics. I assumed it was a loss of pressure since both cars had a single tire a couple pounds lower than the others. It never occurred to me that a sensor would trip if over pressure.

When checking during a drive, I use the Michelin standard of 4-5 lbs above normal.
https://www.michelin.co.uk/tyres/learn-share/care-guide/guide-for-tyre-pressure
 

SSJBart2003

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I just noticed this today in my 18 EX Hatch. The tpms light was steady on. My recommended cold psi is 32. I check and all four of my stock factory tires were at 42 psi. I brought them all down to 32 and will do a touchscreen recalibrate shortly. I only have 2500 miles on the car and tires and have had no tire work since purchase.
 
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SSJBart2003

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Well the “Tire Pressures Low” warning came back on after the on screen calibration. I will give it one more chance to reset and see what happens. If it comes on again then I will have to get it into the dealer. Its only 2 months old.
 

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Well the “Tire Pressures Low” warning came back on after the on screen calibration. I will give it one more chance to reset and see what happens. If it comes on again then I will have to get it into the dealer. Its only 2 months old.
Hi, were you able to find a fix?
Something similar has happened to me too. Yday i got the warning and my "hot" pressure measurement was 37psi. I let the car cool down overnight and measured today at 6am. The pressure was 34psi on all 4 tires. I bled them down to 32psi and ran calibration. I drove for like 10-15mins on the highway, took a break to get coffee, drove again for 10 mins or so and boom the "Tire pressures low" warning came back again :( Not sure what is going on.
Plus since the sign is not blinking, I don't think it is the TPMS that is busted (manual says if it blinks for a minute, it is possibly a TPMS failure)
 


Orun

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I had this happen as well but caught it at around 500mi. Checked the pressure and they were all around 38PSI. Called the dealer to check if this is intended as I certainly didnt fill them 5-6 PSI higher then recommended and they said to just drop it and recalibrate. Apparently they will sometimes overfill in the winter and not adjust when it warms up. Seems like an silly thing to not check before letting someone drive off with the car but at least now I know better!
 

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This happened to me just a few days ago where I had to quickly accelerate to move from the left lane over 3 lanes to the right to make a turn at the next light.

Surprisingly this never happened to me in the two AutoXs I put the car through featuring similar conditions, so it seems to be hit or miss.
 

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I had this happen as well but caught it at around 500mi. Checked the pressure and they were all around 38PSI. Called the dealer to check if this is intended as I certainly didnt fill them 5-6 PSI higher then recommended and they said to just drop it and recalibrate. Apparently they will sometimes overfill in the winter and not adjust when it warms up. Seems like an silly thing to not check before letting someone drive off with the car but at least now I know better!
I was told the Factory sets the pressures high, so when they are strapped down for transportation, they are harder, and there is less chance of movement.

Then, I think it is a pretty common practice for dealers to reduce the pressure down to a low minimum (below manufacturers recommended pressure), so that the "Test Ride" appears to be nice and smooth !!

Bottom line is, you can really never know what they are unless they are checked, and you can never be 100% sure unless you check them yourself !!
As we all know, the pressure of a tire will change with temperature, (Both seasonal, and well as with driving on them), so when you test the pressure it is important to consider temperature.

Since you should be testing the pressure reasonably often, especially between Winter & Summer (and hopefully more than twice a year), it is important to remember that when you measure a pressure, that is a function of temperature.

If your tires are inflated with Nitrogen ( the major advantage of Nitrogen being, it is drys, unlike compressed air that contains water, which causes a bigger variation of pressure with temperature ) then here, in the USA I was happily surprised to find that COSCO will top up your tires with Nitrogen, (to what ever pressure you request) for FREE !! (dealers and Tire Shops typically want to charge you)
(and you don't get many GOOD things for FREE these days !!)

And while talking about Tires, wheel nut Torques can be all over the place, both from Factory, as well as from Dealer - and once again, the only way to be 100% sure is to check them yourself. Remember, It's YOUR life that is at risk with incorrectly torqued Wheel Nuts, and incorrect type pressure .
 
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So I learned something interesting at Wake The Dragon-TPMS warning will activate with pressure INCREASES too.

My drives on Tail and other roads were the hardest most aggressive I've had to date in my Type R and twice I got "Low tire pressure" warnings and both times all 4 tires were fine BUT warm tire pressure was 40 psi all around (cold tire pressure for my Goodyear Eagle All Seasons is 35 psi).

Anyone else have this experience?
This might be a little irrelevant to the Cars that do not directly measure pressure (and Temperature), but instead rely on some calculation or wheel RPM for a given GPS (?) distance covered, but :-

Two things appear to me to be important.
(1) What is your current tire pressure at the moment, and at their current temperature. ?
(2) Are the tires leaking air over time. ?

#2 is the difficult one, because since the temperature is all over the place, so is the pressure, so how can you, the human driver, "easily" tell if the pressure has changed for a given temperature - ie that you have a leak. ? (without some lookup table, or a good ability to do mental numeric calculations)

Well, a computer can do this very easily with a few simple calculation, based on current pressure & temperature, calculate what the Pressure would be for a standard temperature - say 25 deg C.
That should not change by very much over the operating temperature of the tire, so a much tighter Min & Max could be set on that, and if they were exceeded, then it would be a good indication there was a leakage issue.
Then the Convention, wider tolerance Min & Max could be set for the actual real time temperature.

Same tire sensor hardware, just a little extra processing of the data, so WHY has no TPMS manufacture (or APP developer) done this -- or have I missed some that have ?
 

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I wish i found this earlier. My car had been at the dealership the day before for the "product update" for oil dilution. yesterday it came on for what seemed to be no reason. Tire pressure was a bit high but definitely not low and went away with "calibration". I checked again today and it was at 38.5 recommended 32. I dropped them down to 35 until i can check that my digital gauge is 100% accurate (it's 8 degrees and too annoying to fuss with at the moment). Has me thinking that the dealer over-pressured the tires and it caused it.
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