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Resetting the tire pressure monitoring system on a 2008 Dodge Ram 2500 is typically a straightforward process that can usually be done without tools. However, if the standard method doesn't work, you may need a TPMS relearn tool. To start, park the vehicle and let it cool down. It's best to use the recommended cold tire pressure. Inflate all tires to the proper pressure listed on the door jamb placard. Then, leave the vehicle off for at least 20 minutes before driving for a minimum of 10 minutes at speeds over 15 mph (though it may take up to 35 minutes in some cases). Once the system registers the new pressure from each sensor ID, the TPMS light will turn off. If this doesn't resolve the issue, the relearn tool can be used, beginning with the left front tire and moving clockwise around the rest of the tires.
Here's the paraphrased and rephrased version: Push and hold the TPMS button until the light blinks three times. Start the engine and let it idle for 20 minutes. After that, drive at a speed of 50 miles per hour or faster for approximately 10 minutes.
Wow, reaching 50 miles per gallon seems impossible to achieve. I don't think I can reset it.