Left Front Wheel Speed Sensor Input Circuit
Left front wheel speed sensor signal is out of range or missing.
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 left front wheel speed sensor measures how fast the left front wheel is spinning. If it isn't working, the computer won't know how quickly that wheel is turning, which can affect brake performance and stability control.
What the computer is actually seeing
The vehicle's computer expects a voltage signal that varies as the wheel spins, usually between 0.5 to 3.5 volts that changes with speed. If there's no signal or the voltage stays at a constant level, the code will trigger.
What a healthy reading looks like
Expected voltage from the wheel speed sensor is 0.5 to 3.5 volts AC when the wheel is turning; should fluctuate with 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.
- 11. Check for any visible damage to the left front wheel speed sensor and wiring. Repair any issues found. Decision: Is wiring intact? If NO, fix wiring and retest, if YES, continue to step 2.
- 22. Use a multimeter to check the voltage signal from the left front wheel speed sensor while spinning the wheel. Should see 0.5 to 3.5 volts AC. Decision: Is voltage within range? If NO, replace the sensor, if YES, continue to step 3.
- 33. Inspect the ABS control module for any fault codes or connectivity issues. Decision: Are there additional fault codes? If YES, diagnose those as well, if NO, consider replacing the ABS control module.
Common causes
- Faulty left front wheel speed sensor
- Damaged wiring or connectors in the wheel speed sensor circuit
- Corrosion at connectors
- Faulty ABS control module
- Wheel bearing failure affecting sensor reading
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It’s moderate severity; you can drive, but it’s risky for brakes and stability control.
Will this issue come back?
If the root cause isn't fixed, like wiring or sensor replacement, yes.
Why does this code appear with other codes?
Sensor issues can affect multiple systems, leading to related codes.
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 →