Wheel Speed Sensor Signal Failure (Left Front)
The left front wheel speed sensor has detected an issue.
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What it means (plain English)
The computer is not getting a reliable signal from the left front wheel speed sensor, which is crucial for functions like ABS and traction control.
What the computer is actually seeing
The wheel speed sensor should send a signal indicating the wheel's rotational speed, typically a square wave voltage between 0.5V to 5V as the wheel turns.
What a healthy reading looks like
The voltage signal from the sensor should fluctuate between 0.5V and 5V depending on the wheel speed.
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.
- 1Check the wiring and connector to the left front wheel speed sensor for damage or corrosion. Repair if necessary. Decision: If wiring is damaged, fix it and retest; if okay, move to the next step.
- 2Measure the voltage at the wheel speed sensor connector with the ignition on. You should see a voltage of 0.5V to 5V when the wheel is turning. Decision: If voltage is present when turning the wheel, the sensor is likely good; if not, replace the sensor.
- 3Inspect the wheel bearing to ensure the sensor is in the correct position and not misaligned. Decision: If the bearing is bad, replace it; if okay, proceed to check the ABS control module.
Common causes
- Damaged left front wheel speed sensor
- Faulty wiring or connector to the sensor
- Failed ABS control module
- Non-functional wheel bearing affecting sensor position
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It's moderately safe but could impact ABS and traction control functions. It's best to address it soon.
Will this code come back after I clear it?
If the underlying issue isn't fixed, the code will likely return.
Why does this code appear with other codes?
Multiple codes may indicate that other sensors or the ABS system are also having issues.
Working a real vehicle right now?
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