Tyre pressure warning

Discussion in 'Gen 5 Prius Main Forum' started by chris johnson 2, Feb 3, 2025.

  1. chris johnson 2

    chris johnson 2 New Member

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    Several times in the past several weeks I have the tire pressure warning light come on. I even bought a tire pump from Makita and discover it works well on several occasions now.

    Is this normal with a Toyota I ask myself? The dealer says they get hundreds of calls when the weather gets colder. It is always the same tire - driver side front. Every few days I have to add around 6 psi. The car is driving quite normally and were it not for the warning light I would not have noticed.

    The temperature has been hovering around freezing the past several weeks and the dealer says this is the reason. Hang on I say, the Prius sells in Canada and Northern Europe where it gets a lot colder. So I booked an appointment the day after next for them to take a proper look.

    So my question to you guys is whether anybody can share an experience? I don't trust it. Always the same tire? Always pumping in another 6 psi?

    Or am I worrying about nothing? HELP!
     
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  2. BiomedO1

    BiomedO1 Senior Member

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    You've probably got a nail in it, if it's always just that one tire....... Take it to a tire place, for inspection.
     
  3. bisco

    bisco cookie crumbler

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    There is a vast difference between cold weather pressure reduction (see bill belicheck explain it) and adding 6 pounds regularly
     
  4. priusdriver223

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    Hey there, you probably have a small leak somewhere, losing 6 psi every few days is a bit excessive, maybe a month or two, losing 6 psi is reasonable. If you’re looking to do it yourself, unmount your wheel and spray some soapy water as you roll it, you should be able to detect the leak easily. Buy a plugging kit with multiple strips so you can have some for the future. I have plugged my tires at least 5 times in the past year. Good luck and cheers!
     
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  5. bisco

    bisco cookie crumbler

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    I don’t lose that much in a year
     
  6. Trollbait

    Trollbait It's a D&D thing

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    A rule of thumb I heard was that tire pressure changes 1psi for every 10 degrees (F) in temperature change. That could mean the pressure drops enough to set off the TPMS alarm, but it won't keep dropping once the pressure was corrected for the cold.
     
  7. rjparker

    rjparker Tu Humilde Sirviente

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    I recently had an 18 year old who had a license for a month complain his Honda's hydraulic power steering had failed. The tires had 17 psi in them after a cold snap and were probably 25 psi before. Tpms light was on. Aired them up and the "power steering" was then ok.

    One tire losing air? Elementary my dear Watson. A leak.
     
  8. BiomedO1

    BiomedO1 Senior Member

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    Hey!! I add 6 pounds every winter:cry:... I should probably go on a diet!!!:p:D:LOL::ROFLMAO::whistle:
     
  9. chris johnson 2

    chris johnson 2 New Member

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    Ha Ha! I wonder if I am to blame, it being "my" tyre and me being comfortably weighted.
     
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  10. chris johnson 2

    chris johnson 2 New Member

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    It was indeed a very small leak - not reparable they said and it has cost be a new tire. Ouch!
     
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  11. Gokhan

    Gokhan Senior Member

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    There is a possibility that there is excess moisture in the tire air, which is suddenly condensing when it gets too cold. On a dry, nonhumid day, I would jack up the car, deflate the tires completely and fill them with new dry air. Some air compressors also have water coming from the nozzle; so, be careful.
     
  12. Hammersmith

    Hammersmith Senior Member

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    Did you hit a curb with that wheel before this all started? Assuming you didn't run over something and get a puncture, you might have a leak around the bead. The easiest thing to do is just take it to a dealership or a tyre shop and let them figure it out.

    But if you want to start the troubleshooting yourself, take a spray bottle with some soapy water and spray the tyre. Look for bubbles forming. If it's right where the tyre meets the wheel, then all you need is to have the tyre remounted. If it's coming from somewhere on the sidewall, you'll need a new tyre. If it's coming from the middle of the tread, a tyre shop might be able to plug the leak and save the tyre.

    Also theoretically possible to have a leak around the valve stem, or a leaky TPMS valve, but those are far less likely than a puncture or compromised bead.


    edit: Oops, I didn't see your last update. Sorry they couldn't fix it.
     
  13. Mendel Leisk

    Mendel Leisk Senior Member

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    Did they show you the location? I’ve plug repaired a “not repairable” tire (small finishing nail about 3/4” from edge of tread, had it on the car about 8 more years, no problems till it aged out. Used a blackjack, outside-only plug repair kit, allows closer to edge of tread plug repair than the inside/outside plugs that tire places and dealerships are obliged to use.

    twice, second one pretty much same scenario, except small bolt.
     
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  14. Gokhan

    Gokhan Senior Member

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    You could does not mean you should. No reputable tire shop will repair a puncture not in the tread area, as it could cause a catastrophic failure and an accident. Tire manufactures prohibit it, too. I am surprised because you do everything else strictly by the book to say the least. LOL
     
  15. daisy555

    daisy555 Senior Member

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    Mendal, I have to agree with Gokhan on this one! : )
     
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  16. rjparker

    rjparker Tu Humilde Sirviente

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    When it comes to tires, Mendel refuses to fix his tpms or buy a new one.

    Now if they sold a Michelin with an integrated egr cooler he would pounce on the tire's slightest deviation from fully clean and inflated. Brake dust could blow a tpms gasket.
     
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  17. Mendel Leisk

    Mendel Leisk Senior Member

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    Maybe I should have rephrased: I’m not advocating a plug repair beyond the tread zone. I’m talking about a puncture IN the tread zone, but debatably close to the edge of the tread.

    An inside/outside plug is what the shops are obligated to do. When it's within an inch of the tread edge, it's large interior disc will be encroaching on the sidewall, deforming. An outside-only plug repair is just a loop of string going through, can get closer to tread edge. If OP would disclose distance to tread edge it’d help.

    C'mon, man.
     
    #17 Mendel Leisk, Feb 8, 2025
    Last edited: Feb 8, 2025
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  18. daisy555

    daisy555 Senior Member

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  19. Gokhan

    Gokhan Senior Member

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    I just got a tire-pressure warning and then discovered a second nail (well, the first one was a screw) in the right rear tire in six months.

    @Mendel Leisk, do you think this is repairable?

    [​IMG]
     
  20. Mendel Leisk

    Mendel Leisk Senior Member

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    I’d try, DIY with an old-style, outside-only plug, basically a tarry string loop. You should be ok if the initial reamer tool goes through without a lot of fuss. If the resistance doesn’t go down, that’s a bad sign, you’re into sidewall.

    assuming it goes well, spritz with soapy water after to check, and keep an eye on it for the next few weeks.

    Both the plug repairs I did on ours were in that iffy zone, both held up for years, till the tires aged-out.

    when checking our tire treads, when swapping between all-seasons and snows, there’s always a lot more on the rears, and the right-rear is closer to curb and debris.
     
    #20 Mendel Leisk, Feb 10, 2025
    Last edited: Feb 10, 2025
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