If your vehicle has this feature, it is designed to alert you when the system detects a large change in the pressure of one tire. The system cannot alert you before you drive that a tire is low or flat. You must begin driving before the system will work properly. The system works with the brake control system and is designed to detect differences in the tire rotation speeds that are caused by changes in tire pressure. The tire pressure monitoring system does not replace normal tire maintenance, see Tires , Tire Inspection and Rotation and When It Is Time for New Tires .

This light, on the instrument panel cluster, comes on when the tire pressure monitoring system detects a low-tire condition.

This light will also come on for a few seconds and then go off when you turn the ignition to ON. This indicates that the tire pressure monitoring system is functioning properly. If the low-tire pressure warning light comes on while driving your vehicle, the system may have detected a low-tire condition. You need to stop as soon as possible and check your tires for damage. If a tire is flat, see If a Tire Goes Flat and Changing a Flat Tire . Also check the tire pressure in all four tires, and set them to the specified level shown on the tire and loading label. See Inflation - Tire Pressure for additional information.

Note: The tire pressure monitoring system on your vehicle will warn you when one of your tires is significantly under-inflated and when some combinations of your tires are significantly under-inflated. However, there are other combinations of significantly under-inflated tires for which your tire pressure monitoring system may not warn you. These other combinations are relatively common, accounting for approximately half the instances in which vehicles have significantly under-inflated tires. For example, your system may not warn you when both tires on the same side or on the same axle of your vehicle are significantly under-inflated. It is particularly important, therefore, for you to check the tire pressure in all of your tires regularly and maintain proper pressure.

In order for the tire pressure monitoring system to work properly you will need to reset (initialize) the tire pressure monitoring system. Any time you check and/or adjust a tire's pressure, repair or replace a tire or wheel or rotate the tires the tire pressure monitor system needs to be reset.

Do not reset (initialize) the system without first correcting the cause of the low-tire condition. If the system is reset when the tire pressures are incorrect, the system will not function properly and may not alert you when a tire is low.

To reset (initialize) the system:

1. Park the vehicle at a safe place and apply the parking brake. Turn the engine off.
2. Turn the ignition to ON with the engine off.



3. If the low-tire pressure warning light is on, push the SET (reset) button for a few seconds. The low-tire warning light should go off. The reset button is on the instrument panel to the left of the steering wheel.
4. Press and hold the SET (reset) button until the low-tire warning light comes on and flashes on/off three times. The tire pressure warning reset button starts the reset (initialization) process.

If the low-tire pressure warning light does not flash when you hold the reset button the system may be malfunctioning and needs service. See your GM dealer for service.

The system completes the reset (initialization) process after driving at vehicle speeds of at least 19 mph (30 km/h) to 62 mph (100 km/h) for more than one hour. Do not push the SET (reset) button while driving, if you do the initialization process will not be performed. The initialization process can take up to approximately one hour of driving under the following conditions:

The low-tire pressure warning light may not come on even if the tire inflation pressure is low, or it may come on when the tire inflation pressure is set correctly under the following circumstances: