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What does service tire system soon mean in a 2005 Chrysler pacifica?

In a 2005 Chrysler Pacifica (and most vehicles with a similar warning), "Service Tire System Soon" means the vehicle's tire pressure monitoring system (TPMS) has detected a problem. This isn't necessarily a flat tire, but rather one or more of these:

* Low tire pressure: One or more tires are below the recommended pressure.

* TPMS sensor malfunction: A sensor in one or more wheels might be faulty, dead battery, or not communicating properly with the vehicle's computer.

* Tire pressure is dropping slowly: While not critically low yet, the system detects a slow leak which could lead to problems.

You should immediately check the pressure in all your tires using a reliable tire pressure gauge. If any are low, inflate them to the correct pressure (found on a sticker usually located on the driver's side doorjamb or in your owner's manual). If the warning light stays on *after* inflating to the correct pressure, there is likely a problem with one of the TPMS sensors. You will need to have this checked by a mechanic or tire shop.