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 right back wheel's sensor that helps the car know how fast the wheel is spinning.
The right rear tone wheel is part of the wheel speed sensor system, which helps the car's computer monitor wheel speed for functions like ABS.
The C0039 code indicates an issue with the right rear tone wheel, which is responsible for providing data to the wheel speed sensor. This data is used by the vehicle's ABS and traction control systems to ensure proper functioning.
• ABS warning light on
• Traction control warning light on
• Inconsistent braking performance
• Damaged or dirty tone wheel
• Faulty wheel speed sensor
• Wiring issues or poor connection
Tone Wheel: A component that works with the wheel speed sensor to measure wheel speed.
ABS: Anti-lock Braking System, which helps prevent wheel lock-up during braking.
• Inspect the right rear tone wheel for damage or debris.
• Check the wheel speed sensor for proper operation.
• Inspect and test the wiring and connectors for continuity and damage.
• Clean or replace the tone wheel if necessary.
• Replace the wheel speed sensor if faulty.
• Repair or replace damaged wiring or connectors.
• OBD-II scanner
• Multimeter
• Socket set
$100 - $300
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly inspect wheel speed sensors and tone wheels.
• Avoid driving in harsh conditions that may damage components.
• Keep the undercarriage clean to prevent buildup of debris.
Sensor Issue
• Do not ignore the ABS or traction control warning lights.
• Have the vehicle inspected by a professional if unfamiliar with repairs.
Check with your vehicle manufacturer as wheel speed sensors may be covered under powertrain or emissions warranty.
The C0039 code has been commonly reported in vehicles with high mileage or those frequently driven in off-road conditions.
Moderate – While not immediately dangerous, it can affect braking performance.
Driving with a malfunctioning ABS system can increase stopping distances and affect vehicle control.
• Dry and clean surface
• Vehicle parked on a level surface
The right rear tone wheel is located on the rear axle, near the wheel hub.
Q: Can I drive with a C0039 code?
A: It's possible, but not recommended as it can affect your vehicle's braking performance.
Q: How do I clear the C0039 code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue persists, further diagnosis is needed.
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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