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ABS/StabiliTrak Light On in 2019 Regal Sportback

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Chris P. · rep 0 · May 25, 2:46 AM · 1 replies · solved · Question

Vehicle: 2019 Buick Regal Sportback Essence

Hi all, I'm driving a 2019 Buick Regal Sportback Essence, and recently my ABS and StabiliTrak warning lights have come on simultaneously. Sometimes, the brake pedal feels a bit stiffer than usual, and I'm concerned about the safety aspects.

I haven't noticed any major changes in braking performance, but the lights are definitely persistent. Has anyone experienced this combo of warning lights on their Regal Sportback or another Buick model? What was the underlying cause, and is it safe to drive like this?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:46 AM

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ClearTheCode admin answer:

When both the ABS (Anti-lock Braking System) and StabiliTrak warning lights illuminate on your 2019 Buick Regal Sportback Essence, it indicates a fault within the vehicle's braking or stability control system. These systems are interconnected, so an issue with one often affects the other.

Here's what you should know:

  1. Common Causes:

    • Wheel Speed Sensor Failure: This is the most frequent culprit. Each wheel has a sensor that monitors its rotational speed. If one fails, the ABS and StabiliTrak systems lose crucial data, triggering the lights. Common OBD-II codes related to this are C0035, C0040, C0045, C0050 (for left front, right front, left rear, right rear wheel speed sensor circuits respectively).
    • Damaged Wiring or Connector: The wiring harness leading to a wheel speed sensor can become damaged, corroded, or disconnected.
    • ABS Module Failure: Less common, but the ABS control module itself can fail. This is a more expensive repair.
    • Brake Fluid Level: While less likely to trigger both, low brake fluid can affect braking performance.
    • Steering Angle Sensor: A fault here can impact StabiliTrak.

  2. Safety Concerns:

    • When these lights are on, your ABS and StabiliTrak systems are typically disabled. This means that in an emergency braking situation, your wheels could lock up, and your vehicle might skid more easily in slippery conditions. The stiffer brake pedal might indicate a loss of power assist related to the ABS system.
    • It's generally not recommended to drive for extended periods with these warnings, especially if you experience changes in braking feel.

  3. Next Steps:

    • Get the Codes Read: The first and most important step is to have the vehicle scanned for diagnostic trouble codes (DTCs) using an OBD-II scanner. This will pinpoint the exact sensor or module causing the issue.
    • Visual Inspection: If a wheel speed sensor code is present, visually inspect the wiring and sensor at that wheel for obvious damage or debris.

  4. When to See a Shop:

    • Immediately, if you notice significant changes in braking performance or feel unsafe driving.
    • If you cannot read the codes yourself or are uncomfortable performing inspections.
    • A professional technician can accurately diagnose the specific fault, whether it's a sensor, wiring, or the ABS module, and perform the necessary repairs to restore full safety features.
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