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TPWS warning light turned on this morning

Discussion in 'Prius c Technical Discussion' started by Oldwolf, Sep 20, 2012.

  1. Oldwolf

    Oldwolf Prius Enthusiast

    Joined:
    Feb 15, 2011
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    Location:
    NC
    Vehicle:
    2016 Prius v wagon
    Model:
    Four
    So naturally I thought a nail had punctured a tire leading to a slow leak. When I got home I found no nail and the tire pressure on all four tires even but down to about 36psi.

    I refilled to my normal of 40/38 and reset the TPWS system with the button below the steering wheel. The light stayed on for a minute or two of driving then turned off and stayed off for my commute to work.

    What I think probably happened is that I reduced from 42/40 to 40/38 recently without a TPWS reset. Then this morning the temperature outside was 55F and about 65F in my garage. When I left the garage at 5:20AM the TPWS light was off. I drive about 2 mile to the gym each morning and park my C for about an hour. This morning, when I got back in the car the tires had cooled to 55F and I guess that was enough to reduce the pressure far enough to trip my warning light.

    Iirc the manual says a 4-6 psi pressure change will trip the warning light.

    Anyone else had false alarms like this now that the weather is getting cooler?
     
  2. SILVERPC3

    SILVERPC3 New Member

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    Sep 11, 2012
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    Location:
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    2012 Prius c
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    Three
    I had the same thing happen to me, although not on the C but on a Mitsubisgi Outlander.
    As soon as temp fell the TPMS was trigered.
     
  3. Oldwolf

    Oldwolf Prius Enthusiast

    Joined:
    Feb 15, 2011
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    Location:
    NC
    Vehicle:
    2016 Prius v wagon
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    Four