C0050
Right Rear Wheel Speed Sensor Circuit
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OBD2 trouble code C0050 indicates a malfunction in the right rear wheel speed sensor circuit, which is a critical component of your vehicle's anti-lock braking system (ABS), traction control, and electronic stability control systems. The wheel speed sensor monitors the rotational speed of the right rear wheel and sends this information to the ABS control module. When the module detects an incorrect signal, no signal, or an out-of-range reading from this sensor, it triggers code C0050 and typically disables the ABS and traction control systems as a safety precaution.
This code matters because without a functioning wheel speed sensor, your ABS system cannot properly modulate brake pressure during emergency stops, potentially increasing stopping distances on slippery surfaces. Your traction control and stability control systems will also be deactivated, which can affect vehicle handling in adverse conditions. While your regular brakes will continue to work normally, you'll be without these important safety features until the issue is resolved. Additionally, in some vehicles, cruise control functionality may be disabled when this code is present.
If you receive code C0050, you should have it diagnosed and repaired within 1-2 weeks. While you can continue driving with normal braking function, avoid aggressive driving and be extra cautious in wet or icy conditions since your safety systems are compromised. The most common fix is replacing the wheel speed sensor itself, which is a relatively straightforward and affordable repair. A skilled DIYer can often complete this repair in under an hour with basic tools. If you're not comfortable working on your vehicle, a professional mechanic can diagnose the exact cause and perform the necessary repairs, which typically involve inspecting the sensor, wiring, and reluctor ring to determine which component has failed.
Severity
Symptoms
- •ABS warning light illuminated on dashboard
- •Traction control system (TCS) disabled or warning light on
- •Electronic stability control (ESC) warning light active
- •Speedometer may read incorrectly or fluctuate
- •ABS system may not function during hard braking
- •Cruise control may not engage or may disengage randomly
Likely Causes
The sensor itself can fail due to age, exposure to road debris, moisture intrusion, or physical damage from impacts with road hazards.
Wiring harness connectors near the wheel hub are exposed to water, salt, and debris, leading to corrosion that disrupts the electrical signal.
The toothed ring on the axle or hub that the sensor reads can become damaged, rusty, or covered in metallic debris, preventing accurate speed readings.
The sensor wire can be damaged by rubbing against suspension components, being pinched, or deteriorating from age and heat exposure.
Though rare, the ABS control module itself may have internal faults that prevent it from properly reading the sensor signal.
Estimated Cost
Professional Repair
Includes parts + labor
Common Fixes
- Replace the right rear wheel speed sensor
- Clean or repair corroded wiring connections and connectors
- Repair or replace damaged wiring harness to the sensor
- Clean or replace damaged reluctor ring (tone wheel)
- Check and adjust sensor air gap if adjustable