What is the TC fault?
3 Answers
TC refers to the Traction Control System. If this light comes on, it may be because the owner accidentally turned off the traction control switch next to the gear shift lever or there is a fault in the traction control system. The Traction Control System can improve the driving stability of the car, enhance acceleration, and increase climbing ability. Some cars are prone to wheel slippage at high speeds; if the drive wheels slip, it can even cause the vehicle to lose control. When this system is in use, the ECU adjusts according to the current speed at high speeds, enhancing stability and acceleration performance. During climbing, excessive braking force can make it difficult for the vehicle to move. With this system installed, the ECU increases traction based on the current situation, allowing the vehicle to proceed smoothly.
Oh, don't ignore the TC light! This actually indicates an issue with the Traction Control System. Last month during rainy weather, I experienced it while driving—the tires suddenly slipped when accelerating on a wet road, and the small yellow car icon with an S-shaped arrow on the dashboard started flashing. Later at the repair shop, they found that the right front wheel speed sensor was clogged with mud. The system detected abnormal rotation in one tire and automatically intervened to limit power output. Normally, if the TC light stays on (not flashing), it might mean the system has completely failed. This is especially dangerous during uphill climbs or sharp turns, so you should immediately check the ABS pump, sensor wiring, or control module. Remember, if the light comes on, maintain a steady speed and avoid sudden braking. Find a safe spot to stop, restart the car, and if the light remains on, get it inspected right away.
I've driven several cars equipped with TC systems and found that failure symptoms vary significantly across brands. Once when driving a German car on the highway, the TC light suddenly stayed on constantly, limiting power to under 60 km/h. Later diagnostics revealed it was caused by steering angle sensor drift making the computer misinterpret wheel slip. Another time in a Japanese car, both the TC and ABS lights illuminated simultaneously, with troubleshooting showing worn wheel hub bearings caused distorted wheel speed signals. Nowadays many vehicles share sensors between TC and functions like hill start assist and electronic stability control, so a TC light might indicate other system failures too. I recommend paying special attention to cleaning sensor areas during undercarriage washes, as oxidized wiring connectors can also trigger false alarms.
