Since September 2007 all cars in the U.S. have been required to have a Tire Pressure Monitoring System or TPMS. This TPMS monitors the pressure in each of the vehicle’s tires and shows as a tire symbol on the dashboard that glows in yellow to warn you of a tire on the vehicle with pressure that is lower than recommended.         Unfortunately, many have discovered that these TPMS indicators are less that absolutely reliable.


For example, when temperatures fall (like many of the winter nights and mornings we have experienced here in the Houston area) the air in our tires becomes more dense while it was parked overnight.  This denser air makes the TPMS think that the tire has become “flatter” and the warning light comes on.  Nearly always some driving will warm up the tire and its air sufficiently to turn off that TPMS warning light on your dash.  If not, a quick check of pressure with an actual gauge will confirm the actual tire pressure and corrections can be made if necessary.  Generally, maintaining tire pressures above the minimum recommended levels will avoid such TPMS misreadings.  In fact, regardless of the TPMS intentions, it is good practice to manually check your tire pressure regularly to maintain efficient and safe tire performance.


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1 Comment

  1. Lauretta says:

    Excellent reminder regarding a safety measure many of us often forget. Thanks for reliable information, Norton! You guys rock!