ABS Wheel Speed Sensor Circuit - Front Left
Error in the front left wheel speed sensor circuit.
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What it means (plain English)
The front left wheel speed sensor isn't sending the right signals to the ABS module, which can affect braking stability and traction control.
What the computer is actually seeing
The ABS module expects a varying voltage signal from the front left sensor that correlates with wheel speed. Usually, it should range from 0 to 5 volts while the wheel spins.
What a healthy reading looks like
0.5 volts (stationary) to about 5 volts (at maximum wheel speed), typically cycles 5-15 times per second depending on 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.
- 11. Check the wiring and connector for the front left wheel speed sensor. Look for any frays, cuts, or corrosion.
- 22. Measure the voltage at the wheel speed sensor connector while the wheel is spinning. Expected values should be between 0.5 volts (look for voltage when stationary) and 5 volts (at speed).
- 33. If no voltage is present, check the sensor itself by replacing it temporarily with a known good one. If the code clears, you've found your culprit.
- 44. If voltage is present at the connector but the code persists, inspect the ABS module for faults or replace the module as necessary.
Common causes
- Faulty front left wheel speed sensor
- Damaged wiring or connectors
- Corrosion at the connector
- Wheel bearing issues affecting sensor position
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive with this code as it affects the ABS and may compromise braking performance.
Will this code come back after clearing it?
If the underlying issue isn't fixed, yes, the code will likely return.
Why does this code appear with other codes?
Codes for other wheel sensors may appear because the ABS system checks all sensors and flags issues when any one sensor fails.
Working a real vehicle right now?
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