Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer is having trouble getting information from the sensor on the left front wheel that tells it how fast the wheel is spinning.
The C0031 code is set when the ABS module detects a malfunction with the left front wheel speed sensor or its circuit.
The left front wheel speed sensor is part of the Anti-lock Braking System (ABS) and is responsible for monitoring the rotational speed of the wheel. This information is used to prevent wheel lockup during braking. A malfunction in the sensor or its circuit can cause incorrect speed readings, affecting ABS operation.
• ABS warning light on
• Traction control light on
• Inoperative ABS system
• Faulty left front wheel speed sensor
• Damaged sensor wiring or connectors
• Faulty ABS control module
ABS: Anti-lock Braking System, a safety system that prevents wheels from locking up during braking.
OBD-II: On-Board Diagnostics, a standardized system for self-diagnostics in vehicles.
• Visually inspect the left front wheel speed sensor and wiring for damage.
• Use a multimeter to check the sensor's resistance and signal output.
• Scan the ABS module for additional fault codes.
• Replace the faulty left front wheel speed sensor.
• Repair or replace damaged wiring or connectors.
• Replace the ABS control module if necessary.
• OBD-II scanner
• Multimeter
• Socket set
$100 - $300
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly inspect wheel speed sensors and wiring.
• Avoid driving through deep water that can damage sensors.
• Perform regular ABS system checks.
Sensor Issue
• If the ABS light is on, drive cautiously and avoid hard braking.
• Have the vehicle inspected by a professional as soon as possible.
Wheel speed sensors may be covered under the vehicle's powertrain or emissions warranty.
C0031 is a common code associated with ABS issues, often due to sensor or wiring faults.
Moderate – While the vehicle can still be driven, the ABS system may not function properly, affecting braking performance.
Driving with a malfunctioning ABS system can increase the risk of accidents due to impaired braking performance.
• Drive the vehicle at a low speed to test wheel speed sensor output.
• Perform a visual inspection with the vehicle on a lift.
The left front wheel speed sensor is located near the wheel hub assembly on the driver's side front wheel.
Q: Can I drive with a C0031 code?
A: Yes, but it's not recommended as the ABS system may not work properly, affecting braking safety.
Q: How do I reset the ABS light after fixing the sensor?
A: Use an OBD-II scanner to clear the code after repairs are made.
Pro · Four-system diagnostics
A handheld scanner aimed at engine, transmission, ABS, and airbag diagnostic work.
Chassis and ABS faults usually need a scanner that can read brake-system data directly.
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Useful when reassembly torque matters for wheel, suspension, and under-hood fasteners.
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