Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Tire Pressure Monitor (TPM) System
The Tire Pressure Monitor (TPM) system is used for continuous monitoring of tire pressure in all 4 road wheels while the vehicle is moving. It assists the driver in checking tire pressures, and provides warning messages on the instrument cluster display in case of loss of tire pressure.
The system continuously receives radio signals from wheel electronics (tire pressure sensor/valve) located inside each tire. As soon as the wheel sensor senses a significant loss of air pressure in one or more tires, the sensor(s) sends signals (values) to the tire pressure monitoring antenna which then transfers the values to the tire pressure control module. The control module transfers the values to the driver information system in the instrument cluster which displays a flat tire symbol and text message which reads "PLEASE CHECK TYRE PRESSURE". After a few seconds, the message is replaced by the regular display (press the TPMS Set button to show message again). Tire pressures must be checked. If tire pressure is significantly different in one or more tires, check the tire for damage or foreign objects. Replace tire if necessary.
The low pressure warning light in the instrument cluster illuminates when:
- Tire pressure is 7 psi (48 kPa) lower than it should be.
- One or more wheels are installed without a tire pressure sensor.
- Winter tires are installed.
- Incorrect pressure sensors are installed.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.