ABS Warning Light Always On – Ford F-150 2020
The ABS warning light is constantly illuminated, indicating a fault in the anti-lock braking system. This means ABS functionality is disabled, but normal braking should still work. The issue could be a faulty wheel speed sensor, damaged wiring, a bad ABS module, or a blown fuse.
Diagnosis Details
Possible Causes
Faulty wheel speed sensor (most common on F-150s due to exposure to dirt, water, and road salt)
Damaged or corroded wiring/connector at one of the wheel speed sensors
Failed ABS control module or internal fault
Blown ABS fuse or relay
Related OBD-II Codes
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What You Should Do
Have the ABS system scanned with a professional diagnostic tool to retrieve trouble codes.
Inspect all four wheel speed sensors and their wiring for damage or debris.
Check the ABS fuse in the under-hood fuse box.
If no obvious issues, the ABS module may need testing or replacement.
Related Repairs
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Disclaimer: This AI-generated diagnosis is for informational reference only. Always consult a qualified mechanic for an in-person inspection. AutOwner is not responsible for decisions made based on this information.