Left Front Wheel Speed Sensor Circuit Range/Performance Problem
The left front wheel speed sensor is reporting an incorrect signal to the vehicle's computer.
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 expects the left front wheel speed sensor to report a certain voltage or frequency that's in line with the vehicle’s speed, but it’s either too low or too high, indicating a problem with the sensor or its connections.
What the computer is actually seeing
The left front wheel speed sensor should provide a consistent frequency signal that corresponds to wheel speed. If this signal fluctuates outside of expected ranges while the vehicle is in motion, a fault code is triggered.
What a healthy reading looks like
At 30 mph, the expected frequency from the wheel speed sensor is typically around 1-2 Hz. Voltage should be near 5V on the signal wire when inactive and drop accordingly when the wheel is turning.
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 left front wheel speed sensor wiring and connector for damage or corrosion. Repair as necessary. If wiring is good, move to step 2.
- 22. Using a multimeter, check the sensor signal voltage at the connector. You should see around 5 volts when the vehicle is stationary. If not, replace the sensor. If voltage is correct, go to step 3.
- 33. Spin the left front wheel with the vehicle raised and monitor the frequency signal with a scan tool. It should respond proportionately. If it does not, replace the sensor. If it does respond, check the ABS module for faults.
Common causes
- Faulty wheel speed sensor
- Damaged wiring or connector at the sensor
- Corrosion at the connector leads
- Problem with the ABS module
- Incorrect tire size affecting speed calculations
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but you should fix it soon as it could impact braking performance or ABS functionality.
Will this code come back after resetting?
If the underlying issue isn’t fixed, yes, it will likely return.
Why does this code pair with other codes?
Wheel speed sensors can affect several systems, and a failure in one can lead to codes being triggered in related systems, like traction control or stability control.
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