Tire pressure light constantly on

Hi and thanks for using 2CarPros. Com.

The tire pressure monitor sensors use a small battery to function. These batteries begin to fail after about five years. Therefore, if a battery is bad, it will not reset no matter what you do.

To check the TPMS in each wheel requires a specific tool that can determine if there is a signal being sent by the sensor. Once you confirm that all sensors are good, here are the directions specific to your vehicle for relearning the system. It will require a scanner.

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1. Ignition ON, engine OFF, apply the parking brake.
2. Using a scan tool, initiate the TPM Learn Mode.
3. Perform the procedure by following the menu selections. A double horn chirp will sound and the IPC tire pressure monitor indicator warning lamp icon will flash indicating Learn Mode is enabled.
4. Starting with the left front tire, active the sensors by one of the following methods:

* Hold the antenna of the J-46079 aimed upward against the tire sidewall close to the wheel rim at the valve stem location. Press and release the activate button and wait for a horn chirp. Once the horn chirp has sounded, the sensor information is learned.

Warning

Over inflating tires may cause personal injury or damage to the tires and wheels. When increasing tire pressure do not exceed the maximum inflation pressure as noted on the tire sidewall.

* Increase/decrease the tire pressure for 8-10 seconds then wait for a horn chirp. The horn chirp may occur before or up to 30 seconds after the 8-10 second pressure increase/decrease time period has been reached. Once the horn chirp has sounded, the sensor information has been learned.

5. After the horn chirp has sounded, repeat step 4 for the remaining 3 sensors in the following order:

1. Right front
2. Right rear
3. Left rear

6. After the left rear sensor is learned, a double horn chirp will sound indicating all sensor IDs have been learned and the tire pressure module will exit the Learn mode turning OFF the IPC tire pressure monitor warning indicator lamp icon.
7. Ignition OFF, adjust all tires to the recommended pressures. Refer to the tire placard label.

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If you do not have access to a scanner (and most do not) if you have a key fob, try this. Press and hold the lock and unlock button for up to ten seconds to see if the horn chirps. If it does, follow the directions above as far as releasing/inflating tires one at a time until the horn beeps.

I hope this helps. Let me know if you have other questions.

Take care,
Joe

Happy to help. Let me know how things turn out for you. Please keep in mind the battery issue I mentioned in my first post. Also, based on where you live can affect the operation of the system. If you live in an area where temps can drop significantly over night, that can cause the TPMS light to turn on. What happens is oxygen contracts when it gets cold. The result is the tire pressure will drop because of the temperature change. If that is the type of climate you live in and you experience this, the only thing I can suggest is to have the tires filled with nitrogen rather than air. Nitrogen is not as susceptible to temperature change which eliminates the change in pressure and the light turning on. Just wanted to mention that. I live in PA, and I cannot tell you how many people come to me with the light on for that very reason. LOL The air contracts, the light comes on, and people are afraid to drive the car.

Hope you have nice holiday weekend.

Take care,
Joe