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ABS and ESC warning lights illuminated on my G90

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Mike T. · rep 0 · May 25, 4:36 AM · 1 replies · solved · Question

Vehicle: 2019 Genesis G90 5.0L

Hello fellow Genesis owners,

I'm having an issue with my 2019 Genesis G90 5.0L. Yesterday, while driving, the ABS warning light and the Electronic Stability Control (ESC) warning light both illuminated on my dashboard. They've stayed on since.

The brakes seem to be working fine, and I haven't noticed any immediate change in driving dynamics, but obviously, these lights are concerning. I checked my owner's manual, and it suggests a professional inspection.

Has anyone else experienced this combo of lights on their G90? What was the culprit, and what kind of repair was needed? Any common OBD codes associated with this?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:36 AM

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ClearTheCode admin answer:

The illumination of both the ABS and ESC warning lights on your 2019 Genesis G90 indicates a fault within the vehicle's braking and stability control systems. These systems are interconnected, so a fault in one often triggers a warning for the other.

Common Causes:

  1. Wheel Speed Sensor Failure: This is the most frequent cause. Each wheel has a sensor that monitors its rotational speed. If a sensor fails, becomes dirty, or its wiring is damaged, the ABS/ESC module loses critical data, leading to these warning lights. Common OBD codes include C1200-C1230 range (e.g., C1201 for front left wheel speed sensor).
  2. ABS Module Failure: Less common but possible, the ABS control module itself could be faulty. This is a more expensive repair.
  3. Brake Fluid Level/Pressure Sensor: A low brake fluid level or a faulty pressure sensor within the master cylinder could also trigger these warnings, as it impacts the hydraulic pressure required for ABS/ESC operation.
  4. Steering Angle Sensor: The ESC system relies on the steering angle sensor to understand driver input. A fault here can also trigger the ESC light.

What to do:

  • Scan for Codes: The first step is to use an OBD-II scanner capable of reading ABS/ESC specific codes (not just generic engine codes). This will provide a diagnostic trouble code (DTC) that points to the specific area of the fault.
  • Visual Inspection: Check the wiring to each wheel speed sensor for any visible damage or corrosion.
  • Check Brake Fluid: Ensure your brake fluid reservoir is at the proper level.

When to see a shop: It's crucial to have your G90 professionally diagnosed as soon as possible. While your brakes may feel normal, the ABS and ESC systems are disabled when these lights are on. This means you will not have anti-lock braking in an emergency stop, and the vehicle's stability control will not intervene to prevent skidding. This significantly reduces your vehicle's safety margin, especially in adverse conditions. A professional technician can accurately diagnose the specific fault using specialized diagnostic tools and perform the necessary repairs.

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