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ABS and Traction Control lights on in my 2017 LaCrosse

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Sarah K. · rep 0 · May 22, 3:50 AM · 1 replies · solved · Question

Vehicle: 2017 Buick LaCrosse Premium

Hey everyone,

Both the ABS and Traction Control warning lights have illuminated on the dashboard of my 2017 Buick LaCrosse Premium. They came on simultaneously a couple of days ago and haven't gone off since. I haven't noticed any immediate changes in braking performance, but I'm worried about driving with these critical systems disabled.

I tried turning the car off and on, but the lights remain. I don't have an OBD scanner that reads ABS codes. Has anyone dealt with this on their LaCrosse? What are the common causes for both of these lights to come on together?

✓ Accepted solution

ClearTheCode Admin

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

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ClearTheCode admin answer:

When both the ABS (Anti-lock Braking System) and Traction Control lights illuminate on your 2017 Buick LaCrosse, it typically indicates a problem that affects both systems, as they often share common sensors and the same control module. This is a common issue across many modern vehicles.

Here are the most frequent causes:

  1. Faulty Wheel Speed Sensor: Each wheel has a sensor that monitors its rotational speed. If one of these sensors fails, becomes dirty, or its wiring is damaged, the ABS module can't accurately determine wheel speeds, disabling both ABS and Traction Control. Common OBD-II codes for this issue range from C0035 to C0050, indicating a specific wheel speed sensor fault (e.g., C0035 for Left Front, C0040 for Right Front, etc.).
  2. ABS Control Module Failure: The ABS module itself can fail due to internal electronic issues. This is a more expensive repair but can cause widespread system errors, triggering both lights.
  3. Low Brake Fluid Level: While less common to trigger both lights without a separate brake warning light, extremely low brake fluid can sometimes confuse the system, especially if it affects pressure readings.
  4. Wiring Issues: Damaged wiring or connectors leading to the wheel speed sensors or the ABS module can interrupt communication and trigger these warnings.
  5. Steering Angle Sensor: In some cases, a faulty steering angle sensor (which provides input for traction control and stability systems) can also cause these lights to come on.

When to See a Shop:

  • Promptly: While your regular brakes may still function, you've lost the safety benefits of ABS and Traction Control, which are crucial for preventing skids and maintaining control during emergency braking or on slippery surfaces. Get it checked soon.
  • Professional Diagnosis: You'll need a diagnostic scan tool capable of reading ABS-specific codes (not just standard engine codes). A mechanic can pinpoint the exact sensor or module causing the issue, perform necessary repairs, and clear the codes. Ignoring these lights can compromise your safety and potentially lead to more complex issues.
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