Usually, if the service tire monitor system light comes on, it means that you need some adjustments in tire pressures. However, there are other problems that can cause the service lights to come on, which we will show you in the next TPMS diagnostic article.
The tire monitor service light is a warning light, which is connected to the tire pressure monitoring system or TPMS, which tells the driver about high or low air pressure in the tires.
These sensors became popular on various vehicles in the 1990s and onwards and have been in use since the first generation of Silverado 1500. This sensor works well to prevent damage that could be caused by overinflated or underinflated tires, the sensor can eventually wear out or be damaged, resulting in the light not going out.
Common causes for the light not to turn off include incorrect tire pressure and damaged TPMS sensors. However, in some cases, it may only be necessary to reset the tire pressure system.
Steps to reset the service tire monitor system
Step 1 – Tires may need some air
Tires are in continuous use in our vehicles, air can leak out over time and could cause deflation. If the tire is below 25PSI, the tire monitor service light will come on immediately.
- Take an air pressure gauge and measure the PSI of all tires.
- Use an air compressor to fill the tires to the recommended PSI.
After following the steps above and filling the tires to the recommended air pressure you need to reset the TPMS sensors.
Step 2 – Reset the TPMS sensors
Resetting the tire pressure system is always done when you finish filling up with air, deflating (in case of high PSI) or replacing a tire on your vehicle.
In some cases it is possible that the sensors are not fully synchronized with each other, in these cases a procedure for resetting the service light is necessary. The procedure is unorthodox, however, it is mandatory to do this procedure to reset the service light.
- Put your truck in parking.
- Turn the ignition to the RUN position, while the engine is off.
- Turn the headlight switch from ON to OFF four times within three to four seconds, this will put the truck in restart mode and alert you with two horn clicks, then the tire pressure monitor service light will begin flashing.
- Now remove the air from the front tire on the driver’s side.
- Reduce the air in the tire for 10 seconds, this will cause the truck’s horn to sound, just wait. If the horn does not sound, it means the system has been reset, so you will have to perform the procedure again. Each sound means that the tire sensor matches the monitoring system.
- Continue the procedure for each of the tires.
- On the last tire, the horn will sound twice, this means that the process has been completed.
- Now turn off the truck.
- Fill each tire with the air compressor to the recommended pressure values.
- Turn the truck on and check the TPMS light.
Step 3 – Replace the TPMS sensors
It is possible that the TPMS sensors on a wheel may be damaged, although this is unlikely, as it is usually due to the process of mounting the tire.
If the sensor is indeed damaged then the tire must be removed as this is the only safe way to remove the sensor. Once the tire is removed, use the following instructions to replace the sensor.
- Mount a key on either side of the TPMS sensor and remove the old sensor.
- Mount the new sensor on the wheel.