C0065 DTC: Right Front Wheel Speed Sensor Circuit
What Does C0065 Mean?
Diagnostic Trouble Code (DTC) C0065 indicates that the ABS control module has detected a malfunction in the right front wheel speed sensor circuit. The sensor signal may be missing, unstable, or outside the expected range, preventing the ABS module from accurately calculating wheel speed. This can reduce the effectiveness of the Anti-lock Braking System (ABS), Traction Control System (TCS), and Electronic Stability Control (ESC).
Symptoms
- ABS warning light illuminated.
- Traction Control (TCS) warning light ON.
- Electronic Stability Control (ESC) warning.
- Loss of ABS function.
- Unexpected ABS activation.
- Traction Control disabled.
- Cruise control may be disabled on some vehicles.
- Additional ABS DTCs stored.
Common Causes
- Faulty right front wheel speed sensor.
- Open or short circuit in the sensor wiring.
- Loose, damaged, or corroded connector.
- Damaged tone ring (reluctor ring).
- Incorrect sensor air gap.
- Wheel bearing wear causing sensor misalignment.
- Metal debris on the magnetic sensor.
- Faulty ABS control module (rare).
Typical Diagnostic Flow
How to Diagnose C0065
- Read ABS fault codes using a professional scan tool.
- Monitor live wheel speed data during a road test.
- Compare the right front wheel speed with the other wheels.
- Inspect the sensor wiring for open or short circuits.
- Check the electrical connector for corrosion or loose terminals.
- Inspect the tone ring for damage or missing teeth.
- Measure sensor resistance and verify the air gap.
- Inspect the wheel bearing for excessive play.
Typical Values
- All wheel speed sensors should report similar speeds while driving straight.
- Signal values should increase smoothly with vehicle speed.
- Actual specifications vary by vehicle manufacturer.
Estimated Repair Cost
- Wheel speed sensor replacement: $70–250
- Wiring repair: $50–200
- Connector replacement: $30–120
- Tone ring replacement: $80–300
- Wheel bearing replacement: $150–500
- ABS control module replacement: $400–1,200
Related DTCs
- C0064
- C0066
- C0067
- C0068
- C0069
Frequently Asked Questions
Can I drive with C0065?
Yes. Normal braking remains available, but the ABS, Traction Control, and Stability Control systems may be disabled until the fault is repaired.
What is the most common cause of C0065?
The most common causes are a faulty right front wheel speed sensor, damaged wiring, corroded connectors, a damaged tone ring, or excessive wheel bearing play.
Will clearing the DTC permanently fix C0065?
No. Clearing the code only removes it temporarily. If the underlying fault remains, the ABS control module will detect the problem again during the next drive cycle.