Originally published by Modern Tire Dealer on November 3, 2025
Learn how to interpret TPMS lights, locate antennas, and use wiring diagrams to solve sensor and communication issues efficiently.
When a TPMS light comes on, it’s easy to assume one or more tires just need air, but that’s not always the case. Understanding how to read, test, and diagnose the system behind that light is key to effective repairs. These TPMS troubleshooting tips cover the fundamentals every technician should know when facing a stubborn system fault.
First, recognize that not all systems are the same. Some are direct, using sensors mounted in each wheel, while others are indirect, relying on wheel speed data. A few even combine both. That means before reaching for a scan tool, it’s smart to review the wiring diagram. It shows how antennas, modules, and sensors communicate, helping you narrow down the cause of an intermittent or flashing warning light.
A solid TPMS light typically means low pressure in one or more tires. A flashing light, however, signals a deeper issue – often a failed sensor, broken wire, or communication error. Knowing where the antennas are located (in the rear glass, fender liner, or ignition switch) can save diagnostic time and frustration.
And don’t overlook run-flat tires. They can travel up to 50 miles at 50 mph after losing air, which makes TPMS essential for alerting the driver before the tire becomes unsafe.
These TPMS troubleshooting tips help technicians approach every diagnostic with the right process, tools, and mindset, keeping vehicles safe, customers informed, and service bays running efficiently.
