2016-2020 Kia Sorento ABS Light On: Common Causes and Fixes

By Core Brake Parts Tech Team — Circleville, OH warehouse

An ABS light on a 2016-2020 Kia Sorento almost always traces back to one of four things: a wheel speed sensor or its wiring, low system voltage, low brake fluid, or a fault inside the ABS hydraulic unit itself. Your normal brakes still work when only the ABS light is on, but anti-lock and stability control are switched off until the fault is found. The fastest path to the answer is reading the stored ABS code, not guessing at parts.

How the ABS Works on the 2016-2020 Sorento

Kia's owner's manual for this generation explains that the ABS continuously senses the speed of each wheel, and when a wheel is about to lock, it repeatedly modulates the hydraulic brake pressure to that wheel. The electronic stability control (ESC) system relies on wheel speed information too, which is why an ABS fault on a Sorento usually brings the ESC light on with it.

Each wheel has a speed sensor reading a toothed or magnetic ring that turns with the hub. Modern Hall-type sensors, as Bosch describes them, sense the changing magnetic field from that rotating encoder and turn it into a digital pulse signal whose frequency rises with wheel speed, and they can read down to nearly a standstill. The hydraulic electronic control unit (HECU) - the ABS pump, valve block and computer in one assembly - compares the four signals. When one of them drops out, reads implausibly, or does not match the other three, the HECU stores a code and turns the ABS light on.

Normal behavior to know about: the manual says the ABS light stays on for about 3 seconds after the ignition is switched on while the system runs a self-check, then goes out. A click from the engine bay as you first pull away, and a "tik-tik" feel in the pedal during a hard stop on a slippery road, are both described by Kia as the ABS working normally.

What the Warning Lights Are Telling You

Kia's manual also gives a simple first check: if the ABS light comes on while driving, pull over somewhere safe, stop the engine and restart it. If the light goes off, the ABS is normal. If it comes back, the fault is real and there will be a code waiting to be read.

Common Causes, Most Likely First

1. Wheel speed sensor, tone ring or wiring

The sensors live right next to the brakes and hubs, so they see heat, water, road salt and brake dust. Typical failures are a sensor that has gone open or intermittent internally, rust building up under the sensor tip and pushing it away from the ring, a cracked or corroded tone ring, a pinched harness, or a corroded connector. Brake & Front End notes that a sensor not fully inserted during replacement is one of the most common causes of a fresh code, and that rust, debris and moisture all degrade the signal.

Water intrusion at the connectors is a documented Sorento pattern. On the previous-generation 2011-2015 2WD Sorento, Kia ran voluntary service campaign SC148 because seawater could get into the rear wheel speed sensor housing covers, interrupt the rear sensor signal and turn on the ABS and ESC lights; the fix was new housing covers and sealing the connectors. That campaign does not cover the 2016-2020 model, but the lesson carries over: on a vehicle that sees salt or deep water, inspect the connectors and the sensor mounting, not just the sensor.

2. A wheel bearing or hub problem

On many hub assemblies the encoder ring for the speed sensor is part of the bearing or hub. A bearing with play, or a hub replaced with the wrong part, can give an erratic signal that looks like a sensor fault. If the code points to one corner and that wheel also hums or has play, look at the hub before buying a sensor.

3. Low voltage

A weak battery, a poor ground or a recent jump start can make the HECU set a code. Kia specifically calls out jump starting as a cause of the ABS light that does not mean the ABS has failed. Charge and test the battery before chasing other parts.

4. Low brake fluid

Low fluid normally brings on the red brake warning light; when it shows up together with the ABS light, treat it as urgent. Fluid drops naturally as pads wear, so a low reservoir with thin pads may just mean the brakes are due, while a low reservoir with healthy pads means a leak somewhere. Use only the brake fluid type Kia specifies in the owner's manual and never mix different types.

5. The ABS module (HECU) itself

Internal pump motor, valve or circuit faults happen, but they are the least common cause and the most expensive part, so rule out sensors, wiring and voltage first. Replacing a module will not fix a light caused by a bad sensor or a damaged wire.

How to Diagnose It the Right Way

1. Read the ABS codes. A basic engine-code reader often cannot see the ABS module. Use a scan tool that reads ABS/chassis codes; the code will usually name the corner and whether the signal is missing, erratic or out of range.
2. Check the battery and fluid level. Both are free to check and both can set the light.
3. Look at the named corner. Follow the sensor harness from the knuckle to the body connector. Look for chafing, broken clips, green corrosion in the connector and rust scale around the sensor.
4. Watch live data. With the scan tool showing all four wheel speeds, drive slowly in a parking lot. A sensor that reads zero, drops out over bumps, or disagrees with the others is your suspect.
5. Inspect the ring and hub. A cracked, rusted or missing encoder, or a loose bearing, points to the hub rather than the sensor.

The Fix, and What to Replace at the Same Time

Most Sorento ABS lights end with a wheel speed sensor, a harness repair or a hub. When replacing a sensor, clean the mounting bore of rust so the new sensor sits fully seated, route the harness in the original clips, and clear the codes afterward. The light may need a short drive above walking pace before the HECU sees all four signals and stays off.

Because the sensor, hub and brakes share the same corner, it is a good time to check the brakes you are already looking at. If the pads are thin or the rotors are scored, doing them now saves pulling the wheel twice. A complete 2016-2020 Kia Sorento front brake kit covers pads and rotors in one order, our brake parts catalog covers the rest of the system, and brake hardware kits replace the clips and pins. If the reservoir was low because of a leak, a weeping hose is a common culprit; see brake hoses.

Difficulty: reading codes and checking fluid and voltage are driveway jobs. A wheel speed sensor swap is usually a moderate job with basic hand tools, though a rusted-in sensor can take patience. Hub replacement is more involved, and any repair that opens the ABS hydraulic unit needs a bleed procedure that often requires a scan tool to cycle the ABS pump, so that one is best left to a shop.

Is There a Recall for the ABS on a 2016-2020 Sorento?

As of September 2026, NHTSA's recall database lists no ABS or HECU recall for the 2016, 2017, 2018, 2019 or 2020 Kia Sorento. The well-known HECU fire recalls apply to earlier Sorentos: 20V-519 and 21V-331 covered certain 2014-2015 Sorentos for brake fluid leaking inside the HECU, and 23V-652 covered certain 2011-2014 Sorentos. If you own one of those older years, check your VIN at NHTSA. For a 2016-2020, an ABS light is a normal repair item, but it is still worth running your VIN through NHTSA, since recalls can be added at any time.

Frequently Asked Questions

Is it safe to drive a Sorento with the ABS light on?

With only the ABS light on, the normal brakes still work, but the wheels can lock in a hard stop and stability control is off. Drive gently and get it diagnosed. If the red brake light is also on, Kia says the brake system will not work normally, so avoid driving it until it is inspected.

Why are my ABS and ESC lights on at the same time?

Both systems depend on the wheel speed sensors, so a single bad sensor, damaged wire or corroded connector usually turns on both lights.

Will disconnecting the battery reset the ABS light?

It may clear the light briefly, but if the fault is still there the HECU will find it again during its self-check or on the next drive. Read and record the code first so you do not erase the evidence.

Can new brake pads or rotors turn on the ABS light?

Pads and rotors do not feed the ABS, but a brake job can: a sensor harness pulled from its clips, a sensor knocked out of position, or a wire pinched during reassembly can all set a code right afterward. Check the corner you just worked on first.

Do I need to replace the sensor on both sides?

No. Unlike pads and rotors, wheel speed sensors are replaced individually. Replace the one the code and live data point to.

Sources

1. 2018 Kia Sorento Owner's Manual - Anti-lock brake system - how the ABS senses wheel speed and modulates pressure; normal click and pedal feel
2. 2018 Kia Sorento Owner's Manual - ABS warning light - 3-second self-check, restart check, jump start low-voltage warning
3. 2018 Kia Sorento Owner's Manual - Brake fluid - use only the specified fluid, never mix types
4. Kia Service Campaign SC148 (NHTSA) - rear wheel speed sensor housing cover water intrusion on 2011-2015 2WD Sorento, ABS/ESC lights
5. NHTSA recall data - 2014 Kia Sorento - HECU recalls 20V-519, 21V-331 and 23V-652 on earlier Sorentos
6. NHTSA recall data - 2019 Kia Sorento - no ABS or HECU recall listed for this generation
7. Bosch Mobility - Wheel-speed sensor - how Hall-type sensors read the encoder and feed ABS and stability control
8. Brake & Front End - Wheel speed sensors - sensor seating, tone ring damage, rust, debris and wiring as failure points