Wheel Speed Sensor 4 Circuit Failure
Indicates a failure in the wheel speed sensor circuit for wheel 4.
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What it means (plain English)
The computer monitors the speed of each wheel using sensors. If it detects that the signal from the sensor at wheel 4 isn't working or is too weak, it throws this code.
What the computer is actually seeing
The controller expects a consistent voltage signal from the wheel speed sensor, typically between 0.5V to 4.5V depending on the wheel speed. A fault occurs when the signal is absent or not within this range.
What a healthy reading looks like
Wheel speed sensor should deliver 0.5V (stationary) to 4.5V (up to 30-50 mph).
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 for wheel 4. Look for frays or corrosion. If found, repair or replace.
- 22. Measure the voltage at the wheel speed sensor plug. You should see between 0.5V and 4.5V when the wheel is turning. If not, the sensor or wiring is bad.
- 33. Check the sensor resistance: Disconnect the wheel speed sensor and measure its resistance. Typical values range from 1000-2000 ohms. If out of range, replace the sensor.
- 44. If the wiring and sensor are good, check the ABS control module for functioning. Make sure it’s properly connected and power is being supplied.
Common causes
- Wiring issues (frayed, shorted, corroded) in the sensor circuit
- Faulty wheel speed sensor
- Poor connector connection or corrosion
- ABS module malfunction
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It’s advisable to fix this soon since the ABS may not function properly, affecting braking performance.
Will this code come back after clearing it?
If the underlying issue isn't fixed, it will likely return upon driving.
Why is this code paired with others?
Related codes indicate issues with other wheel speed sensors or ABS system circuits.
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