2020 Equinox ABS/Traction Control Light On, Speedometer Acting Up

ClearTheCode admin answer:

Your 2020 Equinox's symptoms – ABS light, Traction Control light, and an erratic speedometer – strongly suggest an issue with one or more wheel speed sensors or their associated wiring. These sensors are crucial for both the ABS and Traction Control systems, and they also provide the vehicle speed data to the instrument cluster.

1. Wheel Speed Sensor Failure:

   • Each wheel has a sensor that monitors its rotational speed. If one fails, it can send incorrect or no data to the ABS control module.
   • Common OBD Codes: A diagnostic scan will likely reveal codes such as C0035 (Left Front Wheel Speed Sensor Circuit), C0040 (Right Front Wheel Speed Sensor Circuit), C0045 (Left Rear Wheel Speed Sensor Circuit), or C0050 (Right Rear Wheel Speed Sensor Circuit). These codes will pinpoint which sensor or circuit is at fault.

2. Wiring Harness Issues:

   • The wiring connecting the wheel speed sensors to the ABS module can become damaged, frayed, or corroded, especially near the wheels where they are exposed to road debris and moisture. A damaged wire can cause intermittent signals, leading to your erratic speedometer readings.

3. ABS Module Malfunction (Less Common):

   • While less frequent, a faulty ABS control module itself could be the culprit. However, this is usually indicated by more widespread issues or specific module communication codes.

When to See a Shop: It's highly recommended to have your Equinox scanned by a professional mechanic as soon as possible. Driving with compromised ABS and Traction Control systems can be dangerous, especially in emergency braking or slippery conditions. A shop can accurately diagnose the specific wheel speed sensor or wiring issue and perform the necessary repairs to restore your safety systems and speedometer function.