Low tire pressure Symbol

Yup. Just check the tire pressures yourself like we did for over a hundred years. Unlike other safety systems, the tire pressure monitoring system is only required by the politicians to be on every vehicle, whether we want to pay for it or not. After that, it is not legally required to work.

But the feature does save a lot of lives by preventing blowouts caused by low air pressure because people never checked the air before the light.

Hi Doc

Happy Monday to you.

I wish the industry would have standardized the systems so we did not have to learn or memorize a golly-zillion different ways of addressing a simple tire rotation.

I can agree with that.

Hello,

Has the issue that cause the light been fixed? If not then need to fix problem before light will go out.

It sounds like one of the tire pressure sensors is out have you had new tires installed recently this usually is what takes them out. Here is how the system works in the descriptions below.

OPERATION

The battery operated tire pressure sensor is both a transmitter and a receiver. The TPM sensor can be forced to transmit by using a special tool such as a TPM-RKE Analyzer. Using a TPM-RKE Analyzer can take up to a minute to force a transmission from a sensor.

NOTE: The TPM-RKE Analyzer will not define the mode.

The TPM sensor can be in one of the following operating modes:

- OFF MODE - A new TPM sensor will be in this mode. In this mode the sensor does not transmit periodically on its own. By forcing a transmission from the sensor with the TPM-RKE Analyzer, it will change to the STATIONARY MODE. The sensor will also automatically change from OFF mode to the STATIONARY MODE once it experiences a great increase in pressure (i.E. Installation into a wheel/tire assembly and then inflated).
- WAL MODE - This is the operating mode the sensor assumes when the vehicle is driven over 15mph (24km/h), but only after the vehicle was previously parked for a duration of 18 minutes or greater. In WAL MODE the sensors transmit every 33 seconds and these transmissions contain left/right information that allows the TPM Module to determine sensor location on the vehicle. WAL MODE lasts for the first 10 minutes of consecutive driving, then NORMAL DRIVE mode ensues.
- FACTORY MODE- This is a special case of WAL MODE. If a TPM sensor has just been taken out of OFF MODE, then for the first 3 minutes of the WAL period (10 minutes) the sensors transmit at an accelerated rate of every 10 seconds. After the first 20 drives, then the sensors never again transmit out of FACTORY MODE.
- NORMAL MODE - This is the operating mode the sensor assumes after the first 10 minutes of a drive. In NORMAL MODE the sensors transmit every 66 seconds and cease transmitting left/right information.
- SERVICE MODE- Once a vehicle stops, the sensors go into SERVICE MODE. After 18 minutes of no driving then the sensors go into the STATIONARY MODE. If the vehicle was stopped for less than 18 minutes and driving resumes, then the sensors go back to the NORMAL MODE.
- STATIONARY MODE - When a vehicle has been stopped for more then 18 minutes, then the sensor is forced into STATIONARY MODE. In STATIONARY MODE the sensor never transmits any pressure information. The sensor leaves STATIONARY MODE and enters WAL MODE when the vehicle is driven above 15mph (24km/h).

Each sensor's (transmitter) broadcast is uniquely coded so that the TPM module can monitor the state of each of the sensors on the four rotating road wheels. The TPM module can automatically learn and store the sensor's ID while driving "within 20 minutes continuously above 15 mph (24 km/h)" after a sensor has been replaced. The vehicle must be stationary for more then 20 minutes in order to initiate the learning sequence. The TPM module can also learn the sensor's ID using the TPM-RKE Analyzer, Special Tool 9936, with the Scan Tool following the procedure listed in the appropriate diagnostic information.

Please let us know if you need anything else to get the problem fixed.