The largest online repair guide library for every car

About us
Contact support
FAQ
Sign up
Sign in

ABS and Traction Control Lights On - 2020 Envision Avenir

0

Paul Z. · rep 0 · May 22, 3:50 AM · 1 replies · solved · Question

Vehicle: 2020 Buick Envision Avenir

Hello forum,

I'm having an issue with my 2020 Buick Envision Avenir. Recently, both the ABS light and the Traction Control light (the one that looks like a car skidding) have illuminated on my dashboard. They came on simultaneously and have stayed on.

The brakes seem to be working fine, and I haven't noticed any strange noises or changes in braking performance, but I know these lights mean something is wrong with critical safety systems. I tried turning the car off and on, but they're still there. Has anyone experienced this with their Envision? What could be the cause, and is it safe to drive?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:50 AM

0

ClearTheCode admin answer:

When both the ABS (Anti-lock Braking System) and Traction Control System (TCS) lights illuminate simultaneously on your 2020 Buick Envision Avenir, it indicates a fault within one of these interconnected systems. While your brakes may feel normal, the advanced safety features are likely disabled. Here's what's typically involved:

  1. Wheel Speed Sensors: This is the most common culprit. Each wheel has a sensor that monitors its rotational speed. If a sensor is dirty, damaged, or its wiring is faulty, the ABS/TCS module won't receive accurate data, triggering the lights. Common OBD codes include C0035 (Left Front Wheel Speed Sensor), C0040 (Right Front), C0045 (Left Rear), C0050 (Right Rear).
  2. ABS Module Failure: The ABS control module itself can fail. This is less common but can happen. A faulty module might not be able to process sensor data or control the ABS pump correctly.
  3. ABS Pump Motor: The pump motor within the ABS module pressurizes the brake fluid during an ABS event. If it fails, the system won't function, and lights will illuminate.
  4. Brake Fluid Level/Pressure Sensor: While less common for both lights, a very low brake fluid level or a fault with the brake pressure sensor could potentially trigger these warnings.
  5. Steering Angle Sensor: The TCS system uses input from the steering angle sensor to determine steering wheel position. A fault here could confuse the TCS.

When to See a Shop:

  • Immediate Diagnostic Scan: It is highly recommended to have your vehicle scanned with an OBD-II scanner capable of reading ABS/TCS specific codes (not just generic powertrain codes). This will pinpoint the exact sensor or component that is faulty.
  • Safety Concern: While your regular braking might feel normal, the ABS and TCS are critical for preventing wheel lock-up during hard braking and maintaining traction on slippery surfaces. Driving without these systems functioning increases the risk of losing control in emergency situations. It's best to have it repaired promptly.
Menu

Help & account