Front Wheel Speed Sensor Performance
There’s a problem with the front wheel speed sensor or its 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 front wheel speed sensor measures how fast the wheel is spinning. If it’s not working right, the computer can’t figure out how fast the vehicle is going, which affects the ABS system and traction control.
What the computer is actually seeing
The vehicle's computer expects a voltage signal from the front wheel speed sensor that varies with wheel speed. If it sees a steady voltage (like 0V or 12V) or a fluctuating signal that’s out of expected range, it triggers this code.
What a healthy reading looks like
The front wheel speed sensor typically outputs a sine wave voltage of 0-5V depending on wheel speed and conditions, with variations based on vehicle speed and sensor design.
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 at the front wheel speed sensor for any visible damage, corrosion, or loose connections. Repair as necessary. Decision: If damaged, fix and retest. If not, proceed to next step.
- 22. Check the voltage output from the front wheel speed sensor while spinning the wheel. You should see a varying voltage signal. Decision: If voltage is present and fluctuates, replace the wheel speed sensor. If no signal, check for continuity in the harness back to the ABS module.
- 33. Test the ABS module for faults or issues affecting the sensor input. If an ABS fault is detected, repair or replace the module as needed. Decision: If ABS module is functioning correctly but no signal from the sensor, replace the sensor.
Common causes
- Wiring damage or corrosion in the sensor circuit
- Faulty front wheel speed sensor
- Bad wheel bearing affecting sensor performance
- Poor connector contacts or damaged connectors
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It may affect traction control and ABS, which can be dangerous in slippery conditions. Fix it soon.
Will this code come back after I clear it?
If the underlying issue isn't fixed, the code will likely return.
Why is this code paired with other codes?
Related codes may indicate issues with the surrounding components or system that interact with the wheel speed sensor.
Working a real vehicle right now?
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