Why doesn't the tire pressure monitoring display on the 2021 Corolla?
2 Answers
It should be an indirect tire pressure monitoring system, which only lights up the tire pressure warning light when there is an abnormality. The indirect tire pressure monitoring system does not display the tire pressure values. It monitors tire pressure by comparing the rotational speed differences between tires, and only displays a tire pressure warning light on the dashboard when the tire pressure is abnormal (either too high or too low). Tire pressure monitoring is generally divided into the following two types: 1. Direct tire pressure monitoring: Direct tire pressure monitoring devices use pressure sensors installed in each tire to directly measure the tire pressure. The pressure information is transmitted wirelessly from inside the tire to a central receiver module, which then displays the tire pressure data for each tire. The system automatically alerts when the tire pressure is too low or there is a leak. 2. Indirect tire pressure monitoring: The working principle of indirect tire pressure monitoring is that when the pressure in a tire decreases, the vehicle's weight will cause the rolling radius of that wheel to become smaller, resulting in a faster rotational speed compared to the other wheels. By comparing the rotational speed differences between tires, the system monitors tire pressure. Indirect tire pressure warning systems actually rely on calculating the rolling radius of the tires to monitor pressure. If the key is turned on and the car is started but no numbers are displayed, it is an indirect tire pressure monitoring system, which only alerts when the tire pressure is below or above the standard value.
My 2021 Corolla also encountered the issue of the tire pressure monitoring system not displaying, which took quite some effort to resolve. The most common cause is the sensor battery running out of power—these are designed to last about five to six years, but some batches might fail earlier. I recall that signals are more prone to dropping in cold winter temperatures. I tried manually rebooting the system: driving the car for a distance, then parking, turning off the engine, waiting a few minutes, and restarting—sometimes this would restore functionality. I also checked the settings menu on the central control screen to ensure the tire pressure display was activated. If these steps don’t work, the sensor itself might be faulty or there could be loose wiring. I recommend first using a tire pressure gauge to check the actual pressure in all four tires to ensure driving safety. It’s also wise to visit a 4S shop promptly to scan for error codes and prevent the risk of a tire blowout.
