Wheel Speed Sensor Signal Failure
The system has detected a fault with the wheel speed sensor 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 computer is trying to read the speed of the wheel but is getting an error, which can cause issues with anti-lock brakes and traction control.
What the computer is actually seeing
The vehicle's computer expects to see a consistent voltage signal (1-5 volts) from the wheel speed sensor while the wheel is turning. An abnormal signal, such as no signal or erratic readings, triggers this code.
What a healthy reading looks like
Voltage from the wheel speed sensor should be between 1-5 volts when the vehicle is moving. When stationary, it may read close to 0 volts, but should show a clear signal upon movement.
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.
- 1Inspect the wiring and connectors to the wheel speed sensor for damage or corrosion. Repair as necessary.
- 2Test the wheel speed sensor voltage with a multimeter. You should see a voltage change as the wheel turns. If not, replace the sensor.
- 3Check for any ABS module faults by scanning for additional codes. If other codes are present, address them first before focusing on C1425.
- 4If the wheel speed sensor and wiring are good, check the ABS module for proper operation or replacement as needed.
Common causes
- Faulty wheel speed sensor
- Damaged wiring to the sensor
- Loose or corroded connectors
- Faulty ABS control module
- Uneven tire sizes affecting readings
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It may be drivable, but traction control and ABS may not work, which could be dangerous in slippery conditions.
Will this code return after clearing it?
If the underlying issue isn't fixed, yes, expect it to return.
Why does this code appear with other codes?
Other faults may be affecting the ABS system, such as issues with the ABS control module or other wheel sensors.
Working a real vehicle right now?
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