How to fix brake code C0050? (Right Rare Wheel Speed Sensor Issue)

Last Updated on July 8, 2025

If you’re planning a long trip, vehicle safety should be your top priority. But what if your journey is suddenly interrupted by an ABS warning light? One of the most common issues in such cases is the C0050 code, which specifically points to a Right Rear Wheel Speed Sensor malfunction. This problem can not only disrupt your peace of mind but also make driving more dangerous—especially if left unaddressed.

Moreover, if you’re not able to fix the issue before or during your trip, you’ll lose confidence in the vehicle’s ability to keep you safe on the road.

What Does the C0050 Code Mean?

The C0050 code refers to a fault with the Right Rear Wheel Speed Sensor. This sensor plays a critical role in your car’s Anti-lock Braking System (ABS) and Traction Control System (TCS).

• Code: C0050
• Meaning: Right Rear Wheel Speed Sensor Malfunction
• System Affected: ABS / Brake Assist

When this sensor fails or provides an irregular signal, your ABS system may become disabled or behave unpredictably. This error is your car’s way of telling you something is wrong, and it needs immediate attention to maintain safe braking and driving performance.

What Is a Wheel Speed Sensor (WSS)?

The wheel speed sensor monitors the rotational speed of each wheel and sends this information to the Electronic Brake Control Module (EBCM). The system then uses this data to manage braking force during slippery conditions or emergency stops.

If the right rear sensor fails:

• The EBCM cannot detect accurate wheel speed.
• ABS, TCS, and stability systems may stop functioning properly.
• You may experience longer braking distances or skidding during sudden stops.

Why This Code Shouldn’t Be Ignored

Ignoring the C0050 code can lead to serious consequences:

• ❌ Reduced braking efficiency
• ❌ ABS warning light stays on
• ❌ Risk of complete sensor failure
• ❌ Poor handling on wet or uneven roads

Even if your vehicle appears to drive normally, your safety systems are compromised.

🧠 Understanding the Speed Sensor Circuit

To fix or understand the C0050 code, you must first know how the speed sensor circuit works. This system is not just a simple plug-and-play device; it’s an essential part of your vehicle’s electronic brain.

🔍 What Is a Speed Sensor?

A wheel speed sensor (WSS) is a magnetic device that detects how fast each wheel rotates. It creates electrical pulses (usually a DC square wave) based on the wheel’s rotation. These pulses are then sent to the Electronic Brake Control Module (EBCM).

The sensor plays a key role in:

• 🛑 Anti-lock braking (ABS)
• 🚦 Traction control (TCS)
• 🛣️ Electronic stability control (ESC)

💡 How It Works

1. Detection: The sensor detects the wheel’s motion using a magnetic field and a toothed tone ring attached to the wheel or axle.
2. Signal Transmission: As the tone ring passes the sensor, it generates a signal that varies with speed.
3. Signal Processing: The EBCM receives the signal and processes it to calculate each wheel’s speed.
4. Brake Control: If one wheel spins slower than the others (indicating a potential skid), the EBCM activates ABS to prevent lock-up.

This system allows your vehicle to adapt instantly to changing road conditions by applying braking power where it’s needed most.

⚠️ What Happens When the Signal Fails?

When the right rear wheel speed sensor signal is too weak, erratic, or missing, your vehicle will log a C0050 trouble code and may disable ABS or traction control entirely.

This usually happens due to:

• ❌ Damaged sensor wiring
• ❌ Loose connections or corroded terminals
• ❌ Faulty magnetic pickup inside the sensor
• ❌ Accumulated dirt, rust, or debris on the tone ring

🛠️ How to Fix Brake Code C0050 (Step-by-Step)

If you’re dealing with the C0050 code, it means your vehicle’s right rear wheel speed sensor circuit is malfunctioning. Fortunately, you can take actionable steps to resolve it—either by yourself if you’re handy or with the help of a professional.

🔧 Step 1: Perform a Visual Inspection

Start by inspecting the following:

• ✅ Wiring harness going to the right rear wheel
• ✅ Connector plugs for looseness, corrosion, or bent pins
• ✅ Wheel speed sensor for physical damage, dirt, or rust buildup
• ✅ Tone ring or reluctor wheel for cracks, debris, or misalignment

👉 Look for signs of:

• Frayed wires
• Pushed-out or bent connector pins
• Water intrusion or corrosion
• Physical damage from off-road driving or debris

🧪 Step 2: Use an OBD2 Scanner

Use a professional OBD II scanner to confirm the C0050 code and see if other related codes are also present (such as C0040 or C0035). If you own a Launch CRP123X or Autel MaxiCheck Pro, these tools can even display live data from the ABS sensors.

• Check the live data stream for each wheel speed.
• If the right rear sensor shows zero or erratic values, it’s the likely culprit.

⚡ Step 3: Test the Sensor with a Multimeter

Unplug the speed sensor from its connector and test it using a multimeter:

• Set the multimeter to AC voltage.
• Spin the wheel and check if voltage pulses are generated.
• If there is no voltage reading, the sensor is likely defective.

Alternatively, test resistance (ohms) across the sensor terminals. If the reading is open-loop (OL) or out of the typical range (usually 800–2500 ohms), replace the sensor.

🔁 Step 4: Replace or Repair the Sensor

If you’ve confirmed the sensor or wiring is faulty, here’s what to do:

• Remove the wheel and access the sensor housing.
• Carefully remove the sensor from the hub (apply penetrating oil if it’s rusted).
• Disconnect the electrical plug and replace it with a new OEM-quality sensor.
• Reconnect, torque bolts to specification, and ensure everything is secure.

🛒 Tip: Always choose a high-quality or OEM part to prevent future issues.

💸 What’s the Cost to Fix the C0050 Code?

Repair costs vary based on vehicle type, labor rates, and region:

• Sensor Replacement: $40 – $120 for parts
• Labor Charge: $75 – $150/hour
• Total Average Repair Cost: $120 – $250

Some vehicles require recalibration after installation—especially models with advanced driver-assistance systems (ADAS).

How to Read and Reset the C0050 Code Using an OBD II Scanner

Modern vehicles are equipped with sophisticated onboard diagnostic systems, known as OBD II (On-Board Diagnostics). These systems help detect and report issues like the C0050 code. But how do you read and reset such codes correctly?

Let’s break it down.

📟 What Is an OBD II Scanner?

An OBD II scanner is a handheld device or mobile app tool that connects to your vehicle’s diagnostic port—usually located under the dashboard on the driver’s side. This tool reads stored trouble codes and offers real-time data from various systems, including the ABS.

Recommended OBD II Scanners for 2025:

• ✅ Autel MaxiCOM MK808S
• ✅ Launch CRP123X
• ✅ BlueDriver Bluetooth Scanner (for iOS/Android)
• ✅ Innova 5610 (offers ABS-specific diagnostics)

🧭 Steps to Read the C0050 Code

1. Connect your scanner to the OBD II port with the ignition on.
2. Navigate to the ABS Module or “Enhanced Diagnostics” section.
3. The scanner will display any active codes, such as:
   • C0050: Right Rear Wheel Speed Sensor Circuit Malfunction
   • Related codes like C0040 (right front), C0035 (left front), etc.

You’ll also be able to view:

• Live data from each wheel speed sensor
• Freeze frame data (vehicle conditions when the code was triggered)
• Pending or historic codes

🔁 How to Reset the C0050 Code

After making repairs:

1. Use the scanner to clear DTCs (Diagnostic Trouble Codes).
2. Turn off the ignition, wait 15 seconds, and restart the car.
3. Take a short test drive to ensure the code doesn’t return.

Important: Only reset the code after addressing the root cause. Resetting without repair will only temporarily turn off the warning light.

🛠️ What If the Code Reappears?

If the C0050 code comes back after repairs, consider:

• Checking for damaged tone rings or misaligned wheel bearings
• Verifying the ABS module is receiving correct voltage
• Updating your vehicle’s ABS firmware (for newer models)

Final Thoughts on Fixing the C0050 Code

The C0050 code may seem minor at first glance, but it plays a major role in your vehicle’s safety and performance. It directly affects your ABS (Anti-lock Braking System) and can lead to traction loss, increased stopping distance, and difficulty driving in slippery conditions.

If your vehicle is displaying the C0050 trouble code, do not ignore it. The right rear wheel speed sensor is essential for real-time braking adjustments, especially during emergency stops. Prompt inspection, diagnosis, and repair can save you from bigger mechanical issues—and more importantly, accidents.

If you’ve followed the steps in this guide:

• ✅ Inspected wires and connectors
• ✅ Tested the sensor using a multimeter
• ✅ Replaced the faulty sensor
• ✅ Cleared the trouble code using an OBD II scanner

…then your vehicle should be back to running safely and efficiently.

Frequently Asked Questions (FAQs)

Q1: Can I drive with the C0050 code active?

A: While your car may still be drivable, it’s not safe. The ABS and traction control systems will not function properly, increasing your risk during sudden braking or on wet roads.

Q2: How long does it take to fix the C0050 code?

A: If you’re experienced with DIY car repairs, it may take 1–2 hours. A professional technician can often diagnose and replace the faulty sensor within an hour.

Q3: Is fixing a wheel speed sensor expensive?

A: Not typically. A replacement sensor costs between $40–$120, while labor adds another $75–$150, depending on your location. So, expect a total cost of $120–$250.

Q4: Can a dirty sensor cause the C0050 code?

A: Yes. Dirt, rust, or brake dust can interfere with the sensor’s signal. Try cleaning it gently before considering a full replacement.

Q5: Do I need to reset the code after fixing the issue?

A: Yes. Use an OBD II scanner to clear the code. If the issue is fixed, the light should stay off. If the light returns, further diagnosis is needed.

🧰 Pro Tip: Keep a Scan Tool Handy

If you’re serious about car maintenance, investing in a good OBD II scanner can save you time and money. Models like the Autel MK808S or Innova 5610 allow you to read ABS-specific codes like C0050 and diagnose problems before they become serious.

Conclusion

When your vehicle flashes the C0050 code, it’s alerting you to a potential failure in one of the most critical safety systems—your brakes. This code specifically relates to the Right Rear Wheel Speed Sensor, a component vital to the performance of your ABS and stability control systems.

Take this warning seriously. With the right tools and guidance (like the steps outlined in this article), you can restore your vehicle’s safety and enjoy your journey with peace of mind.