If your vehicle is showing tire pressure (tpms) light stays on after filling tires, here are the most likely causes and the parts you'll need to fix each one.
Many vehicles require driving above 15-20 mph for several miles to register the new tire pressures. Others require you to press a manual TPMS reset button located in the glovebox, under the steering wheel, or in the infotainment menu.
TPMS sensors have internal, non-replaceable batteries that typically last 7 to 10 years. When a battery dies, the sensor stops transmitting, causing the system to trigger a fault light (often flashing for 60 seconds on startup before staying solid).
The delicate sensor inside the wheel can easily be broken by a tire machine during a recent tire replacement or flat repair. Corrosion from road salt or missing valve caps can also destroy the sensor stem.
Many SUVs and trucks have a full-size spare tire equipped with its own TPMS sensor. If the spare tire loses air over time, the light will stay on even if your four main tires are perfectly inflated.
Some vehicles do not have sensors inside the tires; instead, they use the ABS wheel speed sensors to calculate tire pressure based on rotational speed. A failing sensor will trigger the TPMS light, usually accompanied by an ABS or Traction Control light.
The central computer module or wireless receiver responsible for picking up the signals from the tire sensors has failed, lost its programming, or has a wiring issue.