ABS Light On, causes, How to fix

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If severe braking causes an accident, the Anti-Lock Braking System(ABS) is responsible to keep you safe and remaining in control of the vehicle. the abs warning light in the instrument cluster on your dashboard will illuminate first if there is an issue with your ABS system. In this situation, you can use an Obd2 Scanner with Abs and Srs then must find trouble codes. Here, you’d learn the common symptoms and how to actually fix them.

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Common Causes of ABS Light On

the abs warning light can be triggered by different causes from malfunctioning speed sensors to faulty stator rings. You can grab a scanner like Foxwell NT624 Elite & NT650 Elite and see whether you notice these symptoms below when your ABS warning light comes on.

Malfunctioning Speed Sensor

A malfunctioning wheel speed sensor is one of the many possible causes of the abs warning light coming on. It’s possible that speed sensors for the wheel are housed inside of the transmission itself or perhaps inside the hub itself. The wheel speed sensor feeds data into the Anti-lock Braking System. The pace at which your vehicle’s wheels move is determined by these particular sensors.

As soon as the ABS receives the data from one or more wheels, it identifies that a wheel(s) is moving more slowly than the others, allowing the ABS to release brake fluid pressure.In this way, the wheels can once again move. The ABS will not be able to control the wheel movements if the corresponding speed sensor is covered in filth from ordinary driving or damaged in some other way.

Due to the proximity of the wheel speed sensor to this braking system, it is susceptible to damage from the intense heat generated by the brakes. the abs warning light may illuminate if the wheel speed sensor is damaged.

Faulty ABS Hydraulic Pump

When it gets a reading from the wheel speed sensors, the ABS opens a hydraulic valve to boost the pressure in the brake fluid, preventing the wheels from losing traction. The wear and tear make the pump or the valve more vulnerable. Dirty brake fluid may be a contributing factor to the wear of the internal components. There is a chance that the abs warning light will turn on.

Fuse Blowing Up

The anti-lock brake system has its own fuse, just like the rest of the car’s electrical components and systems. Make sure the ABS fuse isn’t blown or burned before spending time or money replacing pricey parts. You can avoid a lot of hassle by performing a simple check at the fuse box.

Malfunctioning ABS Module

If the ABS module itself is malfunctioning, the light will come on. Corrosion on the cables may increase their resistance, resulting in communication between the Anti-Lock Braking System and the wheel speed sensor being delayed or failing entirely. Corrosion of even the tiniest amount can render the system inoperable. The module’s computer may need to be replaced in the worst-case situation.

Insufficient Hydraulic Brake Fluid

The Anti-lock Braking System also uses hydraulic fluid to regulate the amount of pressure just like the conventional ones. the abs warning light may stay on if the fluid level in the reservoir is too low, preventing the system from doing its job. Another possibility is that the system has excessive air levels. 

Faulty Stator Ring

The wheel speed sensors work collaboratively together to keep track of the wheel’s overall rotational speed. A faulty wheel ring has a ripple effect throughout the entire system. The system is activated if the ring is damaged or dislocated whenever the teeth are missing. If the wheel is moving slower than the rest of them, the mechanism is engaged. Make sure to physically inspect the stator rings if you notice the corresponding symptoms. 

How To Solve ABS Light Illuminating

When the abs warning light illuminates, you know there’s an issue. The kind of ABS issue you’re dealing with has a lot to do with how you can actually fix the problems. Slowing down at a corner can cause the car to behave in a peculiar way. That downhill bend is also blown out of its track, and the vehicle continues to skid straight ahead of it.

If you turn the ignition on and insert the key, the ABS always does a self-test. During a self-test, if the gathered data is incomplete or if the hydraulic pump or the valve fails, the abs warning light will be on. ABS relies on the generic braking system to work properly. Even without the use of the anti-lock braking system (ABS), you’d still be able to engage normal braking.

Replacing the ABS Fuel

If the fuse for the ABS has blown, you need to replace it. Find the fuse panel for the ABS that is located beneath the dashboard, and then replace it. It’s cheap and can’t be repaired, so replacement is the obvious, straightforward solution.

Fixing Leaks of ABS Pump or Valve

If you find that the module of the ABS pump is leaking, you should replace it. Drivers will find the pump on their right.   Unbolt the driver-side fender after tracing the black wiring from the abs module. Clean the bolt and lug with a wire brush. To keep the parts looking new and sparkling, be sure to clear off all of the dirt and grime. Apply quality grease on both sides of the lug and the bolt hole as well as the wire housing. Make certain that you thoroughly grease the metal surfaces. 

Replacing The Wheel Speed Sensor

Use an OBD2 Scanner like Autel Maxisys Elite to check the ABS wheel sensor to retrieve the error or trouble codes. Your car’s error codes tell you whether your sensors are properly connected or whether a short circuit necessitates their repair. These codes include but are not limited to:

  • C0050
  • C0046
  • C0045
  • C0041
  • C0040
  • C0035

Use your toolbox’s basic items to replace the sensor, such as a work lamp, screwdrivers, and pliers.

Getting An ABS Computer Module Replacement

The ABS controller, which keeps tabs on the speed at which the wheels rotate, can fail on occasion. There are several bolts holding the computer module to the motor of the pump. If your brakes make a buzzing sound or the abs warning light stays illuminating even though you’ve turned off the ignition, you need to have the control coils of the valve replaced right away.

Inspecting The Stator Ring(s)

As previously mentioned, the ABS system can malfunction if it has damaged the stator ring. the abs warning light will come on if the stator ring is damaged or displaced, resulting in missing teeth. Intermittent signals are sent to the front wheel speed sensor by a broken stator ring tooth. It appears like a teethed reluctor ring, but the error code is different.  Each tooth of the wheel passes over a magnetic speed sensor as it turns which gives an MPH reading. 

As a result, the controller sends pulses to the wheel’s brake calipers, believing the wheel to be stationary. Whenever you get an irregular signal, the ABS warning light comes on and your brakes may begin to pulsate at low speeds. Check the stator ring and ensure they have complete teeth.

Turning Off Your ABS Warning Light

Once the problem has been fixed, your ABS light should go out automatically. If it doesn’t, you should be able to clear the DTCs and turn off the ABS warning light using Bidirectional Scan Tools after fixing the problems. It’s possible that the abs warning light will come on again if the problem isn’t fixed. 


ABS warning light comes on for some reason and shows different symptoms. If you’ve examined all the possibilities but the abs warning light still flashes, it’s time to replace the controller. The controller’s hydraulics and electronics aren’t user-serviceable and they’re pricey. However, replacement would return the ABS performance. Grab a scanner like Innova 5510 and the chart to see what’s actually wrong and needs replacements.

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