A TPMS warning light that illuminates solid and remains solid usually means that one or more of the tires has low air pressure and needs to be inflated to the correct placard pressure.
However, a light that flashes for 60-90 seconds and then illuminates solid is signaling that there is a problem with the TPMS system. It is very likely that one or more of the sensors are not communicating with the vehicle. This can be caused by a variety of issues. The flashing light can mean the sensor is damaged, missing, or has a dead battery and needs to be replaced. It can also mean that an incorrect sensor is installed in the tire.
To make sure you service the TPMS systems properly, you need to troubleshoot these potential issues until you find the culprit.
Here are some additional tips to keep in mind when your customer comes in for service:
Check the Telltale/MIL every time a customer’s vehicle enters your service bay and document the presence of any illuminated or blinking light before performing any work.
Don’t forget to inspect the spare if it is equipped with a TPMS sensor.
While servicing TPMS, visually inspect stems, hex nut, seal, and cap. The recommended best practice is to replace with new service kit.
Always inform the customer of the benefits of TPMS, regardless of whether it presents a sales opportunity or not.