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Can the TPMS tell if I CHECK the pressure?

Discussion in 'Model S: Driving Dynamics' started by grichard, Nov 22, 2015.

  1. grichard

    grichard Member De-Luxe

    Joined:
    Oct 2, 2015
    Messages:
    200
    Location:
    St. Louis, MO
    I drove this afternoon in the coldest weather since I've owned my MS.

    A few minutes after setting out, my TPMS put up a warning that the right front pressure was low. I pulled up the status screen, and the right front was an amber "37". The left front was a white "37" and the rears were white "38".

    I figured that maybe the right front had dipped down to 36 for a minute, set off the alarm, and the alarm hadn't self-cancelled yet.

    By the time I got home, all of the pressures were up to 39, but the right front still showed amber. I re-booted the center screen to try to clear the alarm. Nope. I turned off the car, got out, and came back. Nope.

    Finally I cursed for a couple of minutes, got my compressor, and put a couple of psi in all the tires. I checked again, and the alarm was gone.

    So: Was the TMPS waiting for me to actually manually check the tire pressure, even after the pressure had got back into spec from driving friction? Or just a coincidence?
     
  2. Tdriver

    Tdriver Member

    Joined:
    Jan 20, 2015
    Messages:
    238
    Location:
    Palm Desert, CA
    The sensor electronics got a little stupid. A pressure bump woke it up. I had the same exact experience.
     
  3. Soolim

    Soolim Member

    Joined:
    Jun 11, 2015
    Messages:
    851
    Location:
    Vancouver, BC, Canada
    Maybe the alarm needs more than 2 psi increase to clear.
     

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