What are the common causes of C0031?

A failed left front wheel speed sensor. An open or short in the left front wheel speed sensor wiring. A loose or corroded left front wheel speed sensor connector. A worn left front wheel bearing or hub. A fault in the ABS control module.

Inspect the left front wheel speed sensor connector for corrosion. Test the left front wheel speed sensor circuit with a multimeter. Monitor the left front wheel speed signal with a scan tool. Check the left front wheel bearing and hub for play. Replace the left front wheel speed sensor if it tests bad. Clear the code and retest.

C0031

Left Front Wheel Speed Sensor

System: Chassis control (C code)
Lamp: ABS Light
Category: Chassis

What it means

C0031 means Left Front Wheel Speed Sensor.

Where it lives

For C0031, the part to look at first is the sensor named here.

Check these first

A failed left front wheel speed sensor
An open or short in the left front wheel speed sensor wiring
A loose or corroded left front wheel speed sensor connector
A worn left front wheel bearing or hub
A fault in the ABS control module

What to do next

Inspect the left front wheel speed sensor connector for corrosion
Test the left front wheel speed sensor circuit with a multimeter
Monitor the left front wheel speed signal with a scan tool
Check the left front wheel bearing and hub for play
Replace the left front wheel speed sensor if it tests bad
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.