Left Front Wheel Speed Sensor Input Signal Malfunction
The system detects a problem with the left front wheel speed sensor signal.
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 computer is trying to read how fast the left front wheel is spinning but it's not getting the right signal, leading to issues with stability control and ABS.
What the computer is actually seeing
It expects a varying voltage signal between 0.5V to 3.5V while the wheel spins, indicating speed changes, but it receives either no signal, a constant voltage, or a signal that doesn’t change as expected.
What a healthy reading looks like
Left front wheel speed sensor should produce a signal that varies between 0.5V and 3.5V based on wheel speed. Speed should match the vehicle speed indicated by the other wheel sensors within 5%.
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 connector between the left front wheel speed sensor and the module. Look for corrosion, breaks, or poor connections.
- 22. Measure the voltage signal coming from the left front wheel speed sensor while spinning the wheel. You should see a varying signal between 0.5V - 3.5V.
- 33. If no signal or a constant signal is present, replace the left front wheel speed sensor and retest.
- 44. If the sensor tests good, check the wiring integrity and continuity to the ABS module. Use a multimeter for this test. Look for values less than 5 ohms for continuity.
- 55. If wiring is good, check the ABS module operation and connections.
Common causes
- Corroded or damaged wheel speed sensor connector
- Broken or frayed wiring to the wheel speed sensor
- Faulty wheel speed sensor
- Absence of wheel speed signal due to a faulty ABS module
Typical repair cost
$$
Related codes
Frequently asked questions
Can I drive the vehicle with this code active?
It's drivable but fix it soon; it impacts safety systems like ABS and traction control.
Will this code come back after clearing?
If the underlying issue isn't fixed, it'll likely return after a short drive.
Why does this code often pair with others?
Multiple wheel speed sensor issues can indicate a broader issue in the ABS system or wiring faults.
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 →