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 understanding the speed of the right front wheel when you start driving.
The vehicle's ABS (Anti-lock Braking System) monitors the speed of each wheel. This code is triggered when the system cannot properly read the speed of the right front wheel as the vehicle starts moving.
The C120D code indicates a malfunction in the drive-off recognition process for the right front wheel speed sensor. This sensor is crucial for the ABS to monitor wheel speed and ensure proper braking performance. The issue could be due to a faulty sensor, wiring problems, or a malfunction in the ABS module.
• ABS warning light on the dashboard
• Inconsistent or erratic ABS operation
• Loss of traction control functionality
• Faulty right front wheel speed sensor
• Damaged or corroded wiring/connectors
• Malfunctioning ABS control module
ABS: Anti-lock Braking System
OBD-II: On-Board Diagnostics, Second Generation
• Use an OBD-II scanner to confirm the code.
• Inspect the right front wheel speed sensor and its wiring for damage.
• Test the sensor's electrical output with a multimeter.
• Replace the faulty wheel speed sensor.
• Repair or replace damaged wiring/connectors.
• Reset the ABS system and clear the code.
• OBD-II scanner
• Multimeter
• Basic hand tools
$100 - $300
Moderate
• Toyota Camry
• Honda Accord
• Ford Fusion
• Regularly inspect wheel speed sensors and wiring.
• Keep the vehicle's undercarriage clean to prevent corrosion.
• Perform regular ABS system checks.
Sensor Issue
• Drive cautiously if the ABS light is on.
• Get the issue diagnosed and repaired promptly to ensure safe braking.
• Avoid harsh braking until the problem is resolved.
Check with the vehicle manufacturer for warranty coverage on ABS components.
This code has been commonly associated with sensor failures due to environmental exposure and wear over time.
Moderate – While the vehicle can still be driven, the ABS system may not function correctly, affecting braking performance.
Driving with a malfunctioning ABS system can increase the risk of accidents due to reduced braking efficiency.
• Vehicle must be in motion.
• ABS system must be active.
The right front wheel speed sensor is located near the wheel hub assembly on the passenger side of the vehicle.
Q: Can I drive with the C120D code?
A: You can drive, but be aware that your ABS system may not function properly, which can affect braking safety.
Q: How do I clear the C120D code?
A: After repairs, use an OBD-II scanner to clear the code from the vehicle's computer.
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.
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