C0046 DTC: Right Rear Wheel Speed Sensor Circuit Range/Performance
What Does C0046 Mean?
Diagnostic Trouble Code (DTC) C0046 indicates that the ABS control module has detected that the right rear wheel speed sensor signal is outside the expected operating range or its performance is abnormal. Although the sensor may still generate a signal, it is inaccurate, intermittent, or inconsistent with the readings from the other wheel speed sensors.
Symptoms
- ABS warning light illuminated
- Traction Control (TCS) warning light ON
- Electronic Stability Control (ESC) warning
- ABS may activate unexpectedly during braking
- Traction Control system disabled
- Cruise control may be unavailable on some vehicles
- Additional ABS-related DTCs stored
Common Causes
- Faulty right rear wheel speed sensor
- Damaged or cracked tone ring (reluctor ring)
- Incorrect sensor air gap
- Excessive wheel bearing play
- Damaged sensor wiring harness
- Loose or corroded connector
- Metal debris on a magnetic sensor
- Faulty ABS control module (rare)
Typical Diagnostic Flow
How to Diagnose C0046
- Read ABS DTCs with a professional scan tool.
- Monitor live wheel speed data while driving.
- Compare the right rear wheel speed with the other wheels.
- Inspect the tone ring for cracks, rust, or missing teeth.
- Verify the sensor air gap meets manufacturer specifications.
- Inspect the wiring harness and connector for damage or corrosion.
- Check the wheel bearing for excessive movement.
Typical Values
- All four wheel speed sensors should display nearly identical speeds during straight-line driving.
- Intermittent or unstable readings indicate a sensor performance problem.
- Specifications vary by vehicle manufacturer.
Estimated Repair Cost
- Wheel speed sensor replacement: $70–250
- Wiring repair: $50–200
- Tone ring replacement: $80–300
- Wheel bearing replacement: $150–500
- ABS module replacement: $400–1,200
Related DTCs
- C0045
- C0047
- C0048
- C0049
- C0050
Frequently Asked Questions
Can I drive with C0046?
Yes. Normal braking remains available, but the ABS, Traction Control, and Stability Control systems may not function correctly until the fault is repaired.
What is the most common cause of C0046?
The most common causes are a faulty right rear wheel speed sensor, damaged tone ring, excessive wheel bearing play, metal debris on the sensor, or damaged wiring and connectors.
Will clearing the DTC permanently fix C0046?
No. Clearing the code only removes it temporarily. If the sensor performance problem remains, the ABS module will detect it again during the next driving cycle.