Wheel Speed Sensor Signal Fault
There’s a problem with one of the wheel speed sensors or its 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 measures how fast each wheel is spinning. If the sensor or its wiring has an issue, the system can't accurately tell how fast the wheels are turning.
What the computer is actually seeing
The control module expects a specific voltage or frequency signal from the wheel speed sensors (typically around 0-5 volts or a frequency indicating wheel rotation).
What a healthy reading looks like
Sensors typically output 0.5V at rest, increasing up to 5V as wheel speed increases; frequency can range from 0-60 Hz depending on speed and conditions.
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 the wheel speed sensor for damage or corrosion. Decision: If damaged, repair the wiring. If fine, move to step 2.
- 22. Test the resistance of the wheel speed sensor. Expected value is between 1,000 to 2,000 ohms. Decision: If out of spec, replace the sensor. If within spec, move to step 3.
- 33. Use a multimeter to check the voltage at the sensor connector while the wheel is spun. Expected signal is 0.5-5V. Decision: If voltage is not within range, replace the sensor. If it is, check the vehicle’s control module.
Common causes
- Faulty wheel speed sensor
- Broken or damaged wiring
- Corroded connector terminals
- Sensor misalignment or mounting issues
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It’s best to avoid driving until this is fixed. It can affect anti-lock brake system function.
Will this code come back after clearing?
It may come back if the underlying issue (like a faulty sensor) isn't fixed.
Why does this code sometimes pair with C1210?
C1210 indicates a signal issue specifically, which often relates to the same issues causing C1220.
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