08 and newer systems are mostly automated now. Meaning that if the tire pressures of all the tires (spare included) are set to the factory specs listed on the sticker in the driver door it should go out on its own. At times however being that the sensors are wireless we have found it necessary to drive a short distance (parking lot, etc) for the computer to notice the change and equalization of pressures.
Keep in mind though that some of the vehicle still have the "set" button on the bottom of the dash on the driver side. Which allows the user to reset the parameters where the system sets off the light. So since fact specs could be 29psi in the front and 32psi in the rear but you are more comfortable with say 38psi front and rear that button will help the comp know where your preference is.
And finally the system is designed (not perfectly) to be able to detect a 2-3psi difference between tires from left to right on the same axle, and a 4-5psi difference between tires on different axles. All said and told to help you stay with inflated tires. unfortunately it usually means we see a lot of customers simply needing their tire lights taken care of.
So double check your pressures, start the truck and press and hold the tpms button until the light begins to blink and then test drive. Other than that and you will most likely be dealing with an issue with an individual sensor, though that usually shows itself by making the light blink every start up.
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