What does it mean when TRC control is turned off?
2 Answers
TRC control being turned off means the vehicle's traction control system is deactivated. The primary function of TRC is to maintain driving stability. Its working principle is: the computer monitors the speed of all four wheels and the steering wheel angle. When excessive speed difference between driven and non-driven wheels is detected during acceleration, the computer sends signals to reduce fuel supply, thereby decreasing driving force and minimizing wheel slip rate. TRC control methods include brake torque control and engine torque control: Brake torque control applies braking force to wheels about to slip, dissipating excess engine torque through the brakes to maintain wheel slip within desired parameters, similar to ABS operation; Engine torque control optimizes driving torque to wheels based on road conditions by adjusting fuel injection quantity, ignition timing, and throttle opening.
That day on the highway, my dashboard suddenly displayed a TRC OFF warning, which scared me into slowing down immediately. TRC is the vehicle's anti-skid system, acting like an electronic nanny to prevent wheel spin. Normally during rain or snow when hitting icy patches, it automatically applies brakes to prevent skidding. The display turning off could mean either I accidentally pressed the physical button near the steering wheel or the system malfunctioned on its own. If it's a button mishap, it's easy to fix—just press it again to restore; but if the system automatically shuts down due to failure, the wheels may spin wildly on slippery surfaces, making the car particularly prone to fishtailing during turns. Once on an icy bridge, I nearly lost control and hit the guardrail. I recommend checking dashboard indicator lights every time you start the car, and getting an undercarriage electrical inspection at the dealership during winter—safety system failures are no joke.
