Wheel Speed Sensor A Circuit Malfunction
There’s a problem with the circuit for 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 wheel speed sensor sends data about how fast the wheel is turning. If it fails, the ABS may not work properly, affecting braking.
What the computer is actually seeing
The computer expects a voltage signal between 0.5V and 5V from the wheel speed sensor that correlates with wheel speed. If it sees a continual low voltage (0V) or high voltage (over 5V), it triggers the code.
What a healthy reading looks like
Sensor voltage should fluctuate between 0.5V and 5V as the vehicle moves. When stationary, expect 0V.
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 wiring and connectors for the front left wheel speed sensor. Look for frays, breaks, or corrosion.
- 22. Check the sensor itself for any physical damage or misalignment.
- 33. Use a multimeter to measure the voltage at the sensor connector while the vehicle is stationary and when moving. Expect 0V when stationary and 0.5V - 5V when moving. Does it fall within this range?
- 44. If the voltage is correct, check for DTCs related to additional wheel speed sensors. If none, suspect a faulty ABS module. If not correct, replace the sensor and retest.
Common causes
- Faulty wheel speed sensor
- Damaged wiring or connector
- Corroded terminals
- Sensor misalignment
- Wheel bearing issues
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It’s moderately safe to drive but you may lose ABS functionality. It's best to fix it soon.
Will the code come back after clear?
Yes, if the underlying issue isn't resolved, it will likely come back.
Why is it affecting my ABS system?
The ABS system relies on accurate wheel speed data. If the sensor fails, it can’t properly control braking.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →