Rick's Free Auto Repair Advice

Tire Pressure and Outside Temperature

Tire Pressure sensor, TPMS light on, and the relationship to Outside Temperature

Tire pressure monitoring systems are required on all 2007 and newer cars. The new law mandates that the driver be notified when tire pressure is 25% below the manufacturer’s recommendations. You may already have TPMS on your vehicle. But did you know that outside temperature can mess with these systems? That’s right. A 10° change in tire temperature results in a 1 psi difference in air pressure. So if your tire was already low on air and temps dipped during the night, you could start the morning with a glowing TPMS light. If it warmed up during the day and you started the car, the light may be out. The moral of the story is this—if the TPMS light is on, especially on a cold morning, check the air pressure in your tires. You’re just kidding yourself if you think that because it went out later in the day that a problem doesn’t exist. You’re wearing out your tires prematurely and wasting gas by riding on low tires.


© 2012 Rick Muscoplat

Posted on by Rick Muscoplat

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