Wheel Speed Sensor - Front Left
Front left wheel speed sensor fault detected.
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What it means (plain English)
The computer is having trouble reading the speed of the front left wheel, which can affect traction control and ABS operation.
What the computer is actually seeing
The ABS or traction control module expects to see a consistent voltage or signal change from the speed sensor, usually around 0-5V depending on speed and conditions.
What a healthy reading looks like
At rest, the sensor should output a steady voltage; when the wheel rotates, voltage will fluctuate proportionally with speed (e.g., 0-5V depending on the design).
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 front left wheel speed sensor wiring for damage or corrosion. Is the wiring intact? If no, repair or replace the wiring.
- 22. Check the connector at the wheel speed sensor for corrosion or looseness. Is the connector secure and free of corrosion? If no, clean or replace the connector.
- 33. Measure the voltage at the sensor connector with the key on (engine off). Is the voltage between 0-5V? If yes, the sensor is likely fine; proceed further. If no, you may have a wiring issue.
- 44. With the vehicle raised, manually rotate the front left wheel. Using a scan tool, monitor the wheel speed signal. Is the wheel speed increasing when the wheel rotates? If yes, the sensor is working; check other systems. If no, replace the wheel speed sensor.
Common causes
- Damaged wheel speed sensor wiring
- Faulty wheel speed sensor
- Corroded connectors
- Wheel bearing issues
- Sensor misalignment
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I drive with this code?
Yes, but you may lose ABS and stability control functions, so fix it soon.
Is this a common issue?
Yes, especially in vehicles with a lot of road grime or salt exposure.
Will this code come back after clearing?
If the underlying issue isn't fixed, yes.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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