Wheel Speed Sensor Input Signal Fault - Left Front
An issue with the left front wheel speed sensor signal has been detected.
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 is not sending the right signals to the computer, making it hard to tell how fast that wheel is turning.
What the computer is actually seeing
The ABS control module expects to see voltage changes from the left front wheel speed sensor that correspond to the wheel's rotation. Normally, this voltage varies between 0.5 volts when the wheel is stationary to approximately 2.5 volts at higher speeds (like 30 mph).
What a healthy reading looks like
0.5 to 5.0 volts on the sensor signal line; frequency of signal corresponds to 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. Inspect the wiring and connectors of the left front wheel speed sensor for damage or corrosion. Repair or replace as necessary. Decision: If damage is found, fix it and retest; if not, proceed to step 2.
- 22. Check the wheel speed sensor resistance with a multimeter. Expected resistance: typically around 1,000 ohms. Decision: If outside this range, replace the sensor; if normal, proceed to step 3.
- 33. Use a scan tool to check live data of the left front wheel speed sensor. Compare with the right front sensor at the same speed. Decision: If not generating a reading, replace the sensor; if readings match, check ABS module.
Common causes
- Damaged wheel speed sensor
- Faulty wiring or connections
- Corrosion or debris on the sensor
- Failed ABS module
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It's moderate; you can drive but the ABS functionality may be impacted, especially in slippery conditions.
Will the code come back after repairs?
If the repair was done correctly and all connections are solid, it shouldn't reappear.
Why does this code sometimes pair with others?
They often relate to other wheel sensor issues or ABS malfunctions.
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 →