Tire Pressure Monitoring System (TPMS) Warning Light Always On
The tire pressure monitoring system (TPMS) warning light is constantly illuminated, indicating one or more tires are significantly under-inflated, or there is a fault in the TPMS system. This can lead to reduced fuel efficiency, uneven tire wear, and potential tire failure if not addressed.
Diagnosis Details
Possible Causes
One or more tires have low air pressure (below the recommended threshold, typically 25% below the placard pressure).
A TPMS sensor battery has died or the sensor is malfunctioning (common after 5-10 years).
The TPMS system needs to be reset after tire rotation, replacement, or seasonal temperature changes.
A TPMS sensor has been damaged or is missing (e.g., after tire repair or replacement).
Related OBD-II Codes
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What You Should Do
Check and adjust tire pressures to the recommended level (found on the driver's door jamb sticker).
If the light remains on after driving a few miles, inspect for punctures or leaks.
If pressures are correct, the system may need a reset (refer to owner's manual) or a sensor may need replacement.
A professional diagnostic scan can identify which sensor is faulty.
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Disclaimer: This AI-generated diagnosis is for informational reference only. Always consult a qualified mechanic for an in-person inspection. AutOwner is not responsible for decisions made based on this information.