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Re: PSI sensor light on.
Yes air pressure lowers as temps go down and raises as temps go up, always make sure the tires are warm when air pressure is checked, this is very important, also the spare is monitored so check it to, since it can't be brought up to operating temp adjust the pressure lower a few pounds, around 2-4 PSI I wanted to add that 40 PSI is high unless u have a load in the truck, I recommend around 34-36 PSI for everyday conditions and most light loads.
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40 psi sounds high. For actual recs check sticker on drivers door. These factory recs are a compromise between comfort and safe handling. For winter driving some people "up" the inflation for better traction in snow, etc.. Check the side of the tire for MAX psi (it's stamped from Tire mfg) You can use the tire mfg.'s 'max" rating safely. Over inflation will cause tires to run on just center treads.
With the ignition on, but before you start the car, press and hold the the "Set" button located in front of the gearshift.
You should hear a tone after holding it for a few seconds. Once you hear the town you can release the button and the light should be reset.
An addition to my previous post (after talking to my husband more). Three of our wheels were snow packed. Not the wheel wells, but the inside of the wheels. He thinks that this is what caused the problem. The ABS sensors are located there. Having them encased in snow was likely what caused this condition. Solution = clean all the snow off your tires -- and the problem should go away. Sounds like the problem is moisture gets into the ABS sensor or something shorts out with the communications to those sensors.
Could be a dirty or snow packed ABS sensor made brake light come on, not 100% sure on yur vehicle. Tire pressures will lower when colder, perhaps all related to snow & cold . If in garage, let it warm up & melt some snow & maybe yur troubles will disappear. I would check tire pressures regardless, they may have been borderline low, and cold caused it to go low enough to trip monitor.