Wheel Speed Sensor A Failure
There's a problem with the front left wheel speed sensor.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The front left wheel speed sensor is either damaged or not sending the right signals, affecting how the vehicle detects wheel speed for ABS/traction control.
What the computer is actually seeing
The ABS control module is not receiving proper voltage or signal frequency from the front left wheel speed sensor, typically expecting between 0.5V to 1.5V when the wheel is stationary, and varying as the wheel spins.
What a healthy reading looks like
Voltage output from the wheel speed sensor should be around 0.5V at rest, increasing to over 1V at speeds above 20 mph.
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 at the front left wheel speed sensor for damage or corrosion. Repair as needed and retest.
- 2Measure the voltage output at the wheel speed sensor connector with the wheel stationary. It should read about 0.5V. If it's not, the sensor might be faulty.
- 3Spin the wheel manually and observe the voltage output; it should increase. If not, replace the sensor.
- 4If the sensor is functioning, check the ABS module for any faults or communication issues.
Common causes
- Damaged wheel speed sensor wiring
- Faulty wheel speed sensor
- Corrupted ABS module
- Rotor or bearing issues causing sensor interference
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
You can drive, but the ABS and traction control systems might not function properly. It's best to fix it soon.
Will the code come back after clearing it?
If the underlying issue isn't resolved, the code will return.
Why does this code appear alongside others?
Multiple codes can indicate a systemic issue, like a failing ABS module or problems at multiple wheel sensors.
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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