Why Are the ABS and ESC Lights On in My Hyundai or Kia?

By The ECU Clinic · 15 Oct 2026

Short answer: in a Hyundai or Kia, the ABS and ESC (Electronic Stability Control) systems share one unit in the engine bay, so a single fault usually turns on both lights. The cause can be a wheel speed sensor, wiring, a switch or sensor the system relies on, or the ESC unit itself. Reading the fault code tells you which.

What is the ESC unit?

ESC is the stability control system. It uses the same hydraulic block, pump motor and electronic control module as the anti-lock brakes (ABS). That is why the ABS light, the ESC light and sometimes the brake warning light come on together: the systems run through the same unit.

Is it safe to drive with the ABS and ESC lights on?

In most cases your normal brakes still work, but anti-lock braking and stability control may be switched off until the fault is fixed. The wheels can then lock under hard braking, and the car will not correct a skid on a wet road. Leave more distance and avoid hard stops. If the red brake warning light is also on, or the brake pedal feels different, stop driving and get the car checked first.

What are the common causes?

• Wheel speed sensor. Each wheel has one. A dirty, damaged or failed sensor is a common cause.
• Wiring and connectors. Sensor wiring runs close to the wheels and can be damaged or corroded.
• Other inputs the ESC relies on. Stability control also uses signals such as steering angle and brake pedal position, so a fault there can turn on the ESC light.
• Low brake fluid or a blown fuse. Simple causes worth ruling out first.
• The ESC unit itself. The control module or the pump motor in the unit can develop internal faults.

How do we find which part is at fault?

1. Read the fault codes. The ESC module stores codes that point to the circuit at fault.
2. Rule out the simple causes. Sensors, wiring, fluid level and fuses.
3. Check the unit. If the codes and tests point to the module or pump, the ESC unit is the problem.
4. Tell you the options. You decide before any work starts.

Repair, recon, used or new?

If the fault is in the ESC unit, we can repair your own unit, or supply a reconditioned, used or new one. The photo above is a Hyundai / Kia ESC unit on our bench. Our repairs come with a 6-month warranty. See ABS pump and module repair for how the options compare.

What should I send?

WhatsApp us your car model, year, chassis number and the fault codes. A photo of the dashboard or the scan tool screen also helps. You can bring the car, or just the unit, to Premier @ Kaki Bukit, or use our pick-up and delivery service.

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