ABS Wheel Speed Sensor Failure (Left Front)
Left front ABS wheel speed sensor has malfunctioned.
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What it means (plain English)
The left front wheel speed sensor detects how fast the wheel is spinning. If it fails, the ABS can't tell if the wheel is skidding, which can affect braking performance.
What the computer is actually seeing
The ABS control module expects a consistent voltage signal from the sensor that varies with wheel speed—typically between 0 to 5 volts. An open or short circuit will produce no signal or a fixed voltage that doesn't change with speed.
What a healthy reading looks like
Voltage from sensor varies with wheel speed: 0 to 5 volts, expected no signal at rest, and increases as speed increases.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Inspect the wheel speed sensor wiring and connectors for any damage or corrosion. Condition check: wiring intact?
- 22. Measure the voltage at the wheel speed sensor connector with the key on (engine off). Expect 5V. Condition check: is voltage present?
- 33. If voltage is present, check the sensor itself for physical issues. Removal required?
- 44. Verify sensor operation by spinning the wheel and observing voltage change. Expect a varying signal from 0 to 5V. Condition check: does voltage vary with wheel movement?
- 55. If all checks are good, suspect the ABS control module may be faulty.
Common causes
- Broken sensor
- Damaged wiring or connectors
- Contaminated sensor surface
- Wheel speed sensor misalignment
- Faulty ABS control module
Typical repair cost
$$ - $$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity; drive cautiously. ABS won't function, but brakes are still operational.
Will this problem come back after repairs?
If repairs are done correctly, it should not return unless there's a separate issue.
Why does this code pair with other wheel speed sensor codes?
Because ABS relies on signals from all wheel speed sensors; issues can affect multiple sensors.
Working a real vehicle right now?
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