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 right back wheel is spinning.
The wheel speed sensor measures the speed of the wheel and sends this information to the car's computer. If the sensor is not working properly, the car might not know how fast the wheel is spinning.
The C003A code indicates a malfunction with the right rear wheel speed sensor circuit. The wheel speed sensor is a critical component in the Anti-lock Braking System (ABS) and traction control system. It provides the vehicle's ECU with data about the rotational speed of the wheels, which is used to prevent wheel lockup during braking.
• ABS warning light on
• Traction control light on
• Inoperative ABS or traction control
• Faulty right rear wheel speed sensor
• Damaged wiring or connector
• Malfunctioning ABS module
ABS: Anti-lock Braking System
ECU: Engine Control Unit
• Check for any other related codes
• Inspect the right rear wheel speed sensor and wiring
• Test the sensor with a multimeter
• Replace the faulty wheel speed sensor
• Repair or replace damaged wiring
• Replace the ABS module if necessary
• OBD-II scanner
• Multimeter
• Socket set
$100 - $300
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly inspect wheel speed sensors
• Avoid driving through deep water
• Perform routine maintenance checks
Sensor Issue
• Do not ignore the ABS warning light
• Have the vehicle inspected by a professional
Check with the vehicle manufacturer for warranty coverage on ABS components.
This code has been commonly reported in vehicles with high mileage or those frequently driven in harsh conditions.
Moderate – This issue affects braking performance and should be addressed promptly.
Driving with a malfunctioning ABS system can increase the risk of accidents.
• Dry pavement
• Vehicle stationary
The right rear wheel speed sensor is located near the wheel hub of the right rear wheel.
Q: Can I drive with a C003A code?
A: It's not recommended to drive with this code as it affects the ABS system, which is crucial for safe braking.
Q: How do I reset the ABS light?
A: Fix the underlying issue first, then use an OBD-II scanner to clear the code.
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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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.
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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.