Speed Sensor Circuit - Front Left Wheel
Indicates a fault in the front left wheel speed sensor circuit.
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What it means (plain English)
The front left wheel has a sensor that tracks how fast the wheel is turning. If there's an issue, the system can't rely on that speed data, which can affect things like anti-lock brakes and traction control.
What the computer is actually seeing
The vehicle's computer monitors the voltage and frequency signals from the front left wheel speed sensor. If the readings are outside of the expected range, it sets a fault code.
What a healthy reading looks like
Typically, the front wheel speed sensor should send a voltage around 0.5-5 volts depending on the speed, and produce a consistent frequency signal that corresponds to wheel rotations—often measured at several hundred Hz for normal operation.
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. Check the condition of the front left wheel speed sensor wiring for damage or corrosion. If found, repair or replace the wiring.
- 22. Inspect the connector at the wheel speed sensor for corrosion or a loose fit. Correct any issues before proceeding.
- 33. Measure the voltage at the sensor connector while the wheel is turning. You should see a voltage between 0.5 and 5 volts. If there’s no voltage, replace the sensor.
- 44. Use a scan tool to check if the sensor readings match the other wheel speed sensors. All should be similar under the same conditions. If this sensor is significantly different, replace it.
- 55. If replacing the sensor does not resolve the issue, test the ABS control module for faults.
Common causes
- Damaged or corroded wiring to the sensor
- Faulty front left wheel speed sensor
- Connector issues (loose or corroded)
- Corrosion or debris on the sensor
- ABS module malfunction
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It's not recommended to drive as it can affect braking and traction control systems.
Will this code come back after clearing?
If the underlying issue isn't resolved, yes, it will likely return.
Why does this code pair with others?
This code often pairs with others related to wheel speed or ABS problems, which indicates a system-wide issue.
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