* Faulty Wheel Speed Sensor: This is one of the most frequent causes. The TCS relies on accurate wheel speed data to detect wheel slippage. A bad sensor provides inaccurate or no data, triggering the light.
* Problem with the ABS System: Traction control often shares components with the Anti-lock Braking System (ABS). A malfunction in the ABS, such as a faulty ABS sensor, module, or pump, can also illuminate the traction control light.
* Low Tire Pressure: Significantly low tire pressure in one or more tires can cause wheel slippage and trigger the traction control light.
* Faulty Traction Control Module (TCM): The TCM is the "brain" of the system. A malfunctioning TCM can cause the light to stay on.
* Wiring Issues: Damaged, loose, or corroded wiring in the TCS system can disrupt its function and illuminate the light.
* Faulty Brake Switch: A malfunctioning brake switch can send incorrect signals to the TCS, causing the light to remain on.
* Other Electrical Problems: Issues with the vehicle's overall electrical system, such as a failing battery or alternator, can sometimes affect the TCS.
* Stuck or Malfunctioning Caliper: A brake caliper that's stuck or malfunctioning can affect wheel speed and trigger the light.
It's crucial to have the vehicle diagnosed by a mechanic to pinpoint the exact cause. Ignoring a consistently illuminated traction control light can lead to reduced vehicle control, especially in slippery conditions, increasing the risk of an accident.
