* System Malfunction: The most common reason is a problem within the ETS system itself. This could be a faulty sensor (speed, wheel speed, etc.), a problem with the wiring, a malfunctioning module, or even a low battery voltage.
* Manual Deactivation: Some Cavaliers allowed the driver to manually turn off the traction control. Check your owner's manual to see if this is a feature on your specific model and if there's a button or switch to reactivate it.
* Wheel Speed Sensor Issue: A faulty wheel speed sensor is a frequent culprit. These sensors tell the system how fast each wheel is rotating, and an inaccurate reading can trigger the light.
* ABS Issues (Interrelated Systems): The ETS and Anti-lock Braking System (ABS) are often closely related. A problem with the ABS system can sometimes also trigger the ETS OFF light.
* Low Brake Fluid: In some cases, low brake fluid can cause the light to illuminate.
What to do:
1. Consult your owner's manual: This is the first step. It might explain how to reset the system or identify the cause.
2. Check for manual deactivation: See if there's a button or switch to turn the ETS back on.
3. Have the system diagnosed: The best course of action is to take your Cavalier to a mechanic or an auto parts store that can perform diagnostics using an OBD-II scanner. The scanner can read the trouble codes stored by the car's computer, which will pinpoint the exact problem.
Driving with the ETS OFF light illuminated means your traction control is not functioning. While you can still drive the car, you should be extra cautious, especially in slippery conditions, as you'll have less control. Get it checked as soon as possible.
