Wheel Speed Sensor - Input Signal Fault
Indicates a problem 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 wheel speed sensor is not sending a correct signal to the brake or stability control systems, which can affect ABS function and vehicle stability.
What the computer is actually seeing
The ABS module monitors the voltage signal from the wheel speed sensor. A consistent or no signal may trigger this code.
What a healthy reading looks like
Typical voltage from a working wheel speed sensor is around 0-12V fluctuating as the wheel turns.
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 wheel speed sensor harness and connectors for damage, corrosion, or loose connections. Repair if necessary. Decision: Is it damaged? If yes, repair or replace harness/connector. If no, proceed to step 2.
- 22. Measure the voltage at the wheel speed sensor with a multimeter when the vehicle is moving. Expect a fluctuating signal around 0-12V. Decision: Is voltage present at the sensor? If yes, proceed to step 3. If no, replace the wheel speed sensor.
- 33. Check the ABS control module for any additional fault codes. If there are related codes, diagnose them according to their descriptions. Decision: Does the ABS module report other codes? If yes, handle those codes first. If no, proceed to step 4.
- 44. Test drive the vehicle and monitor the ABS and stability control systems while observing for faults. Decision: Do the systems function correctly? If yes, the issue may be resolved. If no, consider replacing the ABS control module.
Common causes
- Faulty wheel speed sensor
- Damaged wiring or connectors
- Corrosion or water intrusion in the sensor or connector
- Faulty ABS module
Typical repair cost
$$-$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive for extended periods as it affects the ABS which is crucial for safety during braking.
Will this code come back after clearing?
If the issue is not fixed, the code will likely return after a short drive.
Why does this code often pair with other C15xx codes?
These codes relate to the ABS and traction control systems, which share common components and circuits.
Working a real vehicle right now?
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