C0040 – Right Front Wheel Speed Sensor Circuit Malfunction: Causes, Symptoms & Fixes

C0040 means the right front wheel speed sensor circuit is sending incorrect or no signal, affecting the ABS and traction control system.

❓ What is DTC Code C0040?

C0040 – Right Front Wheel Speed Sensor Circuit Malfunction
The ABS control module has detected a fault in the circuit connected to the right front wheel speed sensor. It compromises accurate wheel speed detection for braking and stability systems.

⚠️ Common Symptoms of C0040

• 🚨 ABS light or traction control light ON

• 🛑 Sudden or uneven braking

• 🚗 Inoperative ABS under hard braking

• ⚠️ Skidding on slippery roads

• 🧭 Faulty speed reading or signal loss

🔍 Common Causes of C0040

1. 🔌 Faulty or damaged right front wheel speed sensor

2. 🔧 Damaged wiring harness or connector corrosion

3. 💧 Water ingress near sensor socket

4. ⚡ Short circuit in sensor wiring

5. 🛠️ Bad ABS control module (less common)

🛠️ How to Fix C0040

✅ 1. Inspect Sensor & Circuit Connections

Check the sensor plug at the wheel hub for corrosion or breaks.
👉 Shop ABS & Wheel Speed Sensors →

✅ 2. Test the Sensor with a Multimeter

Compare resistance readings with OEM specs.

✅ 3. Replace Faulty Sensor

Use original, compatible sensors for proper ABS function.
👉 ABS Components & Harness Kits →

🚗 Commonly Affected Cars

🛒 Nayapurna Links for Fast Fixes

• ABS & Wheel Speed Sensor Components

• Tata ABS & Electrical Parts

• Hyundai Front Wheel Sensor Parts

• Honda ABS Wiring & Sensor Spares

💡 Quick Tips

• Replace both left and right front sensors together for balance

• Always disconnect battery before replacing ABS parts

• Use a scan tool to reset the code after repair

✅ Final Words

The C0040 code directly affects your ABS and road safety. Replace damaged sensors or wiring fast with trusted components from nayapurnaonline.com.