After checking the air pressure, the technician will need to connect a diagnostic scan tool to test the wheel sensors first. In some vehicles, the sensors will not set an OBD-II code directing the technician to the faulty tire pressure sensor, and those must be checked manually. The tires can be inflated and deflated one at a time, and the sensor that does not register the change is faulty. However, if sensors fail to communicate with the control module or the control module is unresponsive, the control module will be diagnosed separately.
RepairPal Recommendations for TPMS system issues
We always recommend contacting the repair center where the tires were last installed. Although the tire pressure sensors are fairly inexpensive, it is best to use the warranty if purchased.
What to look out for when dealing with TPMS lamp issues
It is essential to understanding where to locate the tire pressure information for the vehicle you drive in the event that you need to check, inflate, or deflate the tires. The information is likely posted on the driver door frame, inside the fuel tank lid, or in the owner's manual. Inflating a tire to the maximum allowable limit printed on the sidewall will be incorrectly overinflated every time.
Can I diagnose the TPMS warning lamp myself?
Checking the air pressure in the tires is something anyone can do, and this solves the majority of issues arising with the TPMS warning lamp However, if a tire goes flat without the TPMS warning light being displayed, or the warning lamp does not turn off with correct pressure, diagnosis will need to be performed with a professional scanner.