Wheel Speed Sensor Malfunction
The system detects an issue with one of the wheel speed sensors.
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 there's a problem with the sensor or its connection, the system can't read the speed accurately, which can affect traction control and ABS.
What the computer is actually seeing
The vehicle’s computer continuously checks the signals from the wheel speed sensors. An unusually low or erratic signal indicates a malfunction or a connection issue, triggering the C1440 code.
What a healthy reading looks like
Wheel speed sensors typically output a signal voltage between 0.5 and 2.5 volts depending on the wheel speed. When the vehicle is stationary, the output should be close to 0 volts, and during movement, it should fluctuate according to speed.
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. Visually inspect the wheel speed sensor and connector for damage or corrosion.
- 22. Check wiring continuity from the sensor to the ABS module. Expected resistance should be less than 5 ohms.
- 33. Use a multimeter to test the voltage output of the sensor while spinning the wheel. Expected output is between 0.5 and 2.5 volts while vehicle is in motion.
- 44. If the sensor output is within range, check the ABS module for faults or replacement if necessary.
Common causes
- Damaged wheel speed sensor
- Corroded connector pins
- Broken wiring harness
- Dirty sensor
- Faulty ABS module
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity and can impact traction control and ABS, so drive with caution until repaired.
Will the code come back after clearing it?
If the issue is unresolved, the code will likely return after a short drive.
Why does this code pair with others?
Wheel speed sensor problems often affect multiple sensors, triggering related codes as the system attempts to compensate.
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