Wheel Speed Sensor 1 Malfunction
There’s a problem with the wheel speed sensor on one of the wheels.
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 turning. If it malfunctions, the car's computer can't get accurate speed information, which can affect systems like ABS and traction control.
What the computer is actually seeing
The ABS control module monitors the voltage signal from the wheel speed sensor. If the signal voltage is outside the expected range (usually 0.5V to 5V under normal conditions) or if there's no signal at all, it triggers the C1122 code.
What a healthy reading looks like
Voltage should be steady between 0.5V to 5V. A stable signal is expected when the wheel is in motion.
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. Look for frayed wires or corrosion. If damaged, repair or replace the wiring/connector.
- 22. Check the sensor with a multimeter. Measure the voltage while spinning the wheel. If the voltage is inconsistent or out of range, replace the sensor.
- 33. Clean any debris or dirt around the sensor that might affect its operation. Test drive to see if the code returns.
- 44. If the sensor and wiring are good, test the ABS control module for faults using a scan tool. If malfunctioning, replace the module.
Common causes
- Damaged or corroded wheel speed sensor
- Wiring issues or connector faults
- Debris blocking the sensor
- Failed ABS control module
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It's drivable, but be cautious as ABS and traction control may be disabled.
Will this code come back after clearing?
If the issue isn't fixed, it likely will return after a short drive.
Why does this code sometimes pair with others?
Multiple codes can occur due to shared wiring or issues affecting several components.
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