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  1. #1
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    Tire pressure low indication

    I keep getting a tire pressure low indication on my 2010 Charger R/T AWD, but all the tires are fine. Equal pressure on all 4. Any ideas? Bad TPMS?

    Thanks for any help you can offer.

    KrustyTC63



  2. #2
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    Maybe check your spare? Not sure if it's got a sensor, but it's worth a shot.

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  3. #3
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    Quote Originally Posted by KrustyTC63 View Post
    I keep getting a tire pressure low indication on my 2010 Charger R/T AWD, but all the tires are fine. Equal pressure on all 4. Any ideas? Bad TPMS?

    Thanks for any help you can offer.

    KrustyTC63
    Mine comes on occasionally when it's colder weather. With warmer weather I figure it's because the connection is disrupted. After driving a bit the indicator turns off.

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    2006 MRT, Blaze Red Crystal Pearl (PRH), Upgraded Rear Police Brakes, Mopar Police Wheels with Continental ContiPureContact, Stock Rims with Bridgestone Blizzak WS-80, Danko Predator Grille, BT Catch Can, LMI AirHammer, EGR disabled, 91 tune, H8 battery (AC Delco 49AGM).

  4. #4
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    If, say, today is 90F and your tires are at 30psi, then tonight it freakishly drops to 50F, your tires will now be at about 26psi. Pressures will change about 1psi per 10 degrees in temperature.

    Warmer temps cause the air to expand, giving you more pressure. As you drive and the tires heat up you may see a 4-6psi increase. That's why you always check the tires cold (overnight sit for example). Overnight when the temps drop, that air contacts causing the pressure to drop.

    I don't know about the older cars, but my 17 was programmed from the factory to turn on the TPMS light at 25psi. So if you only had 26 in there, an overnight sit may very well have dropped the temps low enough to turn it on.

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  5. #5
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    Quote Originally Posted by KrustyTC63 View Post
    2010
    10 year old sensors? Maybe time for new ones.




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  6. #6
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    I guess I need to give a little more info. Checked my tire pressure this morning, 67 degrees out, 35lbs each tire. Start the car, get the low pressure indicator, drive away, light goes off and stays off. Left work today, 87 degrees out, low pressure indicator comes on as soon as I start the car and stays on all the way home. I'll call my mechanic and see if he has a way to test the sensors. Thanks for all the input!

    later,
    KrustyTC

  7. #7
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    Quote Originally Posted by Slidd View Post
    10 year old sensors? Maybe time for new on
    Yep, or get appcar and shut off the TPMS.

  8. #8
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    Air doesn't expand and contract. Pressure is thee molecules striking the sensor. when hot they move faster and hit more often thus higher pressure and cold is just the other way. Baroom science lesson.

  9. #9
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    NASA...
    As the molecules heat and move faster, they are moving apart. So air, like most other substances, expands when heated and contracts when cooled. Because there is more space between the molecules, the air is less dense than the surrounding matter and the hot air floats upward.


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  10. #10
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    Quote Originally Posted by Slidd View Post
    10 year old sensors? Maybe time for new ones.
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    You'd be surprised, I have a 2006 and am still on the originals.

    OP, does your car have EVIC? If so, you should still be able to see the tire pressures. Are they accurate at all 4 corners?

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  11. #11
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    I think only the SRT8 EVIC displays the 4-corner pressures.

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