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ABS and ESC Lights On - 2016 Sonata SE

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Mike T. · rep 0 · May 25, 2:01 AM · 1 replies · solved · Question

Vehicle: 2016 Hyundai Sonata SE

Hello everyone,

I'm having an issue with my 2016 Hyundai Sonata SE. Both the ABS warning light and the Electronic Stability Control (ESC) light came on yesterday and have stayed on. 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 a few times, but the lights remain illuminated. I also checked my brake fluid level, and it seems to be fine. I haven't had any recent work done on the car that would explain this.

What could be causing both of these lights to come on simultaneously? Is there a common sensor or issue that affects both ABS and ESC? I'm hoping it's not a major repair. Any advice or common diagnostic trouble codes (DTCs) I should be aware of?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:01 AM

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ClearTheCode admin answer:

When both the ABS and ESC (or Traction Control) lights illuminate simultaneously on your 2016 Hyundai Sonata, it almost always indicates an issue with a shared component or system. These systems rely heavily on the same sensors and control modules. Here are the most common causes:

  1. Wheel Speed Sensor (WSS) Failure: This is by far 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 and ESC modules lose crucial data, causing them to fault and illuminate the warning lights. Common OBD-II codes associated with this are typically in the C003x-C005x range, like C0031 (Left Front Wheel Speed Sensor), C0034 (Right Front WSS), etc.
  2. ABS Module/Pump Failure: Less common, but a fault within the ABS control module or the hydraulic pump can trigger these lights. This is usually a more expensive repair. Diagnostic tools can often pinpoint if the module itself is faulty.
  3. Brake Light Switch: A faulty brake light switch (the switch that tells the car when you're pressing the brake pedal) can sometimes cause ESC and ABS issues, as these systems need to know when the brakes are applied. This is often accompanied by non-functioning brake lights.
  4. Low Brake Fluid Level: While you checked this, it's worth re-emphasizing. Extremely low fluid can affect ABS performance and trigger warnings, though typically the brake warning light would also be on.
  5. Wiring/Connector Issues: Damaged wiring or corroded connectors to any of the ABS/ESC components can interrupt signals and cause system faults.

When to See a Shop:

  • Immediate Diagnostic Scan: The most crucial step is to get your vehicle scanned with an OBD-II scanner that can read ABS/ESC-specific codes (not all basic scanners can). This will provide a specific diagnostic trouble code (DTC) that points directly to the failing component.
  • Safety Risk: While your regular brakes may still function, the ABS (anti-lock braking system) and ESC (electronic stability control) are disabled. This means you could experience wheel lock-up during hard braking and lose traction more easily in slippery conditions. It's recommended to drive cautiously and have it repaired as soon as possible.
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