Wheel Speed Sensor Fault
Indicates a malfunction in the wheel speed sensor circuit.
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 wheel speed sensor gauge tells how fast each wheel is spinning. If it's broken or has bad wiring, the system won't get the right speed readings.
What the computer is actually seeing
The Engine Control Module (ECM) sees inconsistent or missing signals from the wheel speed sensors. In a healthy system, you should see a voltage signal that varies with wheel speed, typically around 0.5 to 3 volts when at rest, and up to 12 volts when spinning.
What a healthy reading looks like
0.5 to 3 volts at rest, varying towards 12 volts during motion. Frequency should be 0-15Hz at idle, increasing with 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 wheel speed sensor for damage or corrosion. If found, repair or replace as necessary. Decision: Did you find any issues? If yes, fix it and retest. If no, continue.
- 22. Measure the voltage at the wheel speed sensor connector with the engine running. Expected range is 0.5 to 3 volts while at rest. Decision: Is the voltage in this range? If yes, replace the wheel speed sensor. If no, continue.
- 33. Check the resistance of the wheel speed sensor. It should typically be between 1,000 to 2,500 ohms. Decision: Is the resistance within range? If yes, further diagnose the ABS module. If no, replace the wheel speed sensor.
Common causes
- Faulty wheel speed sensor
- Damaged wiring or connectors
- Corrosion in connector terminals
- ABS module issues
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It may affect ABS and traction control functions, so it's best to repair it soon.
Will this code come back after clearing?
If the issue is not resolved, it will likely return.
Why does it pair with C0501?
They both relate to wheel speed sensor faults but could indicate different specific issues.
Working a real vehicle right now?
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