Symptoms
- ABS icon lit on the dash
- Normal braking feels the same
- No brake pedal changes in most cases
Likely causes
- CommonFaulty wheel speed sensorSensors get dirty, damaged, or fail, especially near a wheel that's been serviced.
- CommonLow brake fluid levelSome ABS systems trigger a warning when fluid drops below a threshold.
- PossibleBlown ABS fuseAn easy and cheap thing to check before assuming a bigger failure.
- PossibleFailing ABS module or pumpMore expensive to fix and usually confirmed by a scan tool.
- Less commonCorroded wiring or connector at a wheel sensorCommon in areas with road salt.
What to do
- Check the brake fluid reservoir level and top it off if low.
- Check the fuse box for a blown ABS fuse using the owner's manual diagram.
- Drive normally but be extra cautious on wet, icy, or gravel surfaces since ABS won't assist.
- Get the code read at a parts store or shop to identify which wheel sensor or component is at fault.
- Inspect the flagged wheel speed sensor and its wiring for visible damage or corrosion.
- Clean or replace the sensor as needed, then clear the code and test drive.
- Have a mechanic address the ABS module if the issue isn't a sensor or fuse.
Tools and parts
Wheel speed sensorSearch: “ABS wheel speed sensor for your car make and model”
When to call a pro
See a mechanic to scan and repair the ABS system, especially before winter or wet-weather driving.
Safety
Use caution
Regular brakes still work, but avoid hard braking on wet or icy roads since the anti-lock system won't engage to prevent skidding.