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 sensor that tells the car how fast the back wheels are spinning.
The rear wheel speed sensor measures the rotational speed of the rear wheels and sends this information to the vehicle's computer.
The C003D code is set when the vehicle's computer detects a malfunction in the rear wheel speed sensor circuit. This sensor is crucial for systems like ABS (Anti-lock Braking System) and traction control, as it provides data on wheel speed to help maintain vehicle stability and control.
• ABS warning light on
• Traction control light on
• Inoperative speedometer
• Faulty rear wheel speed sensor
• Damaged wiring or connectors
• Malfunctioning ABS module
ABS: Anti-lock Braking System
OBD-II: On-Board Diagnostics II
• Check for any additional codes and address them first.
• Inspect the rear wheel speed sensor and its wiring for damage.
• Test the sensor with a multimeter to ensure it's functioning properly.
• Replace the faulty rear wheel speed sensor.
• Repair or replace damaged wiring or connectors.
• Replace or reprogram the ABS module if necessary.
• OBD-II scanner
• Multimeter
• Socket set
$100 - $300
Moderate
• Ford Focus
• Chevrolet Malibu
• Toyota Camry
• Regularly inspect wheel speed sensors and wiring.
• Ensure proper maintenance of the ABS system.
• Avoid driving through deep water which can damage sensors.
Sensor Issue
• Do not ignore the ABS warning light.
• Have the vehicle inspected by a professional if unsure.
• Avoid harsh driving conditions until repaired.
Check with your vehicle manufacturer for specific warranty coverage on ABS components.
Wheel speed sensor issues have been a common diagnostic trouble code due to their critical role in safety systems.
Moderate – While the vehicle may still be drivable, safety systems like ABS and traction control may not function properly.
Operating a vehicle with malfunctioning ABS or traction control can be dangerous and may not comply with safety regulations.
• Vehicle on a lift or jack stands
• Ignition in the 'on' position
The rear wheel speed sensor is typically located near the wheel hub or axle of the rear wheels.
Q: Can I drive with a C003D code?
A: While the car may still be drivable, it's not safe to ignore this code as it affects the ABS and traction control systems.
Q: How do I reset the ABS light?
A: After repairing the issue, use an OBD-II scanner to clear the code and reset the ABS light.
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.