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ABS and ESC Warning Lights On My 2019 S90 T8

0

Mike T. · rep 0 · May 25, 3:54 AM · 1 replies · solved · Question

Vehicle: 2019 Volvo S90 T8 Inscription

Hi everyone,

I'm looking for some advice regarding my 2019 Volvo S90 T8 Inscription. Recently, both the ABS (Anti-lock Braking System) and ESC (Electronic Stability Control) warning lights have illuminated on my dashboard. They came on simultaneously while I was driving normally, and they've stayed on since.

I haven't noticed any immediate changes in braking performance or steering, but I know these systems are crucial for safety. I'm worried about driving the car with these lights on. Has anyone else experienced this with their S90 or another Volvo? What's the most common cause for both of these lights to come on together? I'm planning to get it scanned, but I'd like to have some idea of what to expect.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:54 AM

0

ClearTheCode admin answer:

When both the ABS and ESC (sometimes referred to as DSTC or Stability Control on Volvos) warning lights illuminate simultaneously, it almost always indicates a fault within the ABS system, as the ESC system relies heavily on ABS components and sensor data to function correctly. This is a critical safety concern.

  1. Most Common Causes:

    • Wheel Speed Sensor Failure: This is by far the most frequent cause. Each wheel has a sensor that monitors its rotational speed. If a sensor fails (due to dirt, damage, or electrical fault), the ABS/ESC module loses crucial data, triggering the lights. Common OBD-II codes related to this include C0031 (Left Front Wheel Speed Sensor), C0034 (Right Front), C0037 (Left Rear), C0040 (Right Rear), or similar manufacturer-specific codes.
    • ABS Module Failure: The ABS control module itself can fail, either electronically or mechanically (e.g., pump motor). This is a more expensive repair.
    • Wiring Harness Issues: Damaged or corroded wiring to a wheel speed sensor or the ABS module can interrupt signals.
    • Low Brake Fluid: While less common to trigger both lights without a separate brake warning, extremely low fluid can sometimes affect system performance.
    • Steering Angle Sensor: The ESC system also uses a steering angle sensor. A fault here can trigger ESC, and sometimes ABS, lights.

  2. What You Should Do:

    • Scan for Codes: The absolute first step is to get an OBD-II scanner that can read ABS/Chassis codes (not just generic powertrain codes). This will pinpoint the specific fault. Many auto parts stores offer free code scanning.
    • Avoid Hard Braking: While your regular brakes should still function, the ABS and ESC systems are disabled, meaning you won't have anti-lock braking or stability assistance in emergency maneuvers or slippery conditions.

  3. When to See a Shop:

    • Immediately: Driving with disabled ABS and ESC systems compromises your vehicle's safety features. You should have this diagnosed and repaired as soon as possible.
    • A professional technician will:
      • Read and interpret the specific diagnostic trouble codes (DTCs).
      • Inspect the relevant wheel speed sensors and their wiring for damage or debris.
      • Test the ABS module's function if sensors and wiring check out.
      • Perform any necessary repairs or replacements to restore full functionality to your S90's critical safety systems.
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