Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with the part of the car that tells how fast the left front wheel is spinning.
The vehicle's computer has detected a mechanical issue with the left front wheel speed sensor, which may affect the car's ability to measure wheel speed accurately.
The C0518 code indicates a mechanical fault with the left front wheel speed sensor. This sensor is responsible for monitoring the rotational speed of the wheel and sending this data to the vehicle's ABS control module. A mechanical issue could involve physical damage, misalignment, or obstruction affecting the sensor's operation.
• ABS warning light on
• Traction control light on
• Inconsistent speedometer readings
• Damaged wheel speed sensor
• Debris obstructing the sensor
• Faulty wiring or connections
ABS: Anti-lock Braking System
Sensor: A device that detects or measures a physical property and records, indicates, or otherwise responds to it.
• Inspect the left front wheel speed sensor for physical damage.
• Check for debris or obstructions around the sensor.
• Test the sensor's electrical connections and wiring.
• Replace the damaged wheel speed sensor.
• Remove any debris obstructing the sensor.
• Repair or replace faulty wiring or connections.
• OBD-II scanner
• Multimeter
• Socket set
$100 - $300
Moderate
• Chevrolet Silverado
• GMC Sierra
• Cadillac Escalade
• Regularly inspect wheel sensors for damage.
• Keep the wheel area clean from debris.
• Check sensor connections during routine maintenance.
Sensor Issue
• Avoid driving at high speeds until the issue is resolved.
• Have the vehicle inspected by a professional mechanic.
Check with the vehicle manufacturer for warranty coverage on wheel speed sensors.
Wheel speed sensor issues have been common in vehicles with ABS systems, especially as they age or in harsh driving conditions.
Moderate – While the vehicle may still be drivable, the ABS and traction control systems may not function properly.
Driving with a malfunctioning ABS sensor can increase stopping distances and reduce vehicle control in emergency situations.
• Vehicle on a lift or jack stands
• Wheels removed for sensor inspection
The left front wheel speed sensor is located near the brake rotor of the left front wheel.
Q: What does a wheel speed sensor do?
A: A wheel speed sensor measures the speed of a wheel and sends this information to the car's computer systems.
Q: Can I drive with a C0518 code?
A: It's possible to drive, but it's not recommended as the ABS and traction control systems may not work properly.
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.
View on Amazon
Universal · Torque wrench
Useful when reassembly torque matters for wheel, suspension, and under-hood fasteners.
Useful when wheel, hub, or suspension hardware needs correct reassembly torque.
View on Amazon
Universal · Drive-on ramps
Helpful for safer access underneath the vehicle during exhaust, EVAP, and underbody inspection work.
Helpful for safer access during underbody inspection work.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.