Tire Pressure Monitor (TPM) System

The BCM monitors the tire pressure in the 4 road tires with tire pressure sensors. The tire pressure sensors are battery operated and mounted to the valve stems. The IPC illuminates the TPMS warning indicator and the message center displays a message when a fault is present or when the tire pressure falls below the low pressure limit. The programmed tire pressure cannot be changed.

NOTE: A scan tool can be useful in diagnosing TPMS concerns and may be used to verify if the TPMS sensors are transmitting accurate tire pressure data by comparing the PID tire pressure data in the BCM to the actual tire pressure using a digital tire pressure gauge

Each tire pressure sensor transmission is compared against a low-pressure limit (pressure listed on vehicle certification label minus 25 percent, which will be about 6-9 psi). If it is determined that the tire pressure has fallen below this limit, the SJB sends a message to the instrument cluster, which then illuminates the low pressure warning indicator and displays the appropriate message(s) in the message center (if equipped).

Under the following conditions, the TPM system may not function properly:

Low tire pressure.
Tire pressure sensor is missing or damaged.
Spare tire is installed as a road wheel.
Incorrect tire pressure sensor is installed.
Tire pressure sensor installed incorrectly.
Non-OEM wheels installed (aftermarket rims).
Non-OEM equipped run-flat tires installed.
Other non-OEM modifications (roll cages, service barriers, part racks, ladder racks, etc.)