Tire Monitor System - Warning Lamp ON In Cold Temps.

TPMS (Tire Pressure Monitoring System) Tire
Pressure Warning Lamp "On" at Cold Ambient

If a customer comments that the TPMS (Tire Pressure Monitoring System) tire pressure warning lamp is "ON" for the first few miles of driving after a cold start or stays "ON" continuously, particularly in cold ambient, please be sure to inform the customer that the system is operating correctly to warn of a low tire pressure condition, and a system diagnosis may not be required. The customer should be made aware of the following:

This condition may be caused by low tire pressure if the tire pressure falls below the low warning threshold for any reason including low temperature effects.

NOTE:
For vehicles equipped with the TPMS, the threshold pressure limit is 25% below the vehicle's recommended cold tire pressure, shown on the placard located on the driver side B-pillar.

^ Recommend to the customer to inflate tires when they are cold.

NOTE:
The tire pressure will vary with temperature by about 1 psi (6.9 kPa) for every 12°F (6.5°C).

^ Recommend to the customer to check and adjust all wheels' tire pressures, including the spare tire, once a month. (For additional information, request the customer to refer to the vehicle owner's manual).