C0047 DTC: Right Rear Wheel Speed Sensor Circuit Low
What Does C0047 Mean?
Diagnostic Trouble Code (DTC) C0047 indicates that the ABS control module has detected a voltage or signal level below the expected operating range in the right rear wheel speed sensor circuit. This condition is commonly caused by a short to ground, excessive circuit resistance, damaged wiring, or a faulty wheel speed sensor.
Symptoms
- ABS warning light illuminated
- Traction Control (TCS) warning light ON
- Electronic Stability Control (ESC) warning
- ABS disabled during hard braking
- Traction Control unavailable
- Cruise control may be disabled on some vehicles
- Additional ABS-related DTCs stored
Common Causes
- Faulty right rear wheel speed sensor
- Sensor circuit shorted to ground
- Damaged or pinched wiring harness
- Loose, corroded, or water-damaged connector
- Damaged tone ring (reluctor ring)
- Wheel bearing wear causing an incorrect air gap
- Faulty ABS control module (rare)
Typical Diagnostic Flow
How to Diagnose C0047
- Read ABS DTCs using a professional scan tool.
- Monitor live wheel speed data while driving.
- Compare the right rear wheel speed with the other three wheels.
- Inspect the wiring harness for damage or contact with ground.
- Check the electrical connector for corrosion or moisture.
- Inspect the tone ring for cracks, rust, or missing teeth.
- Measure sensor resistance and circuit voltage according to manufacturer specifications.
Typical Values
- All wheel speed sensors should display nearly identical vehicle speeds while driving.
- A low or missing signal usually indicates a sensor or circuit fault.
- 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 module replacement: $400–1,200
Related DTCs
- C0046
- C0048
- C0049
- C0050
- C0051
Frequently Asked Questions
Can I drive with C0047?
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 C0047?
The most common causes are a faulty right rear wheel speed sensor, wiring shorted to ground, damaged connectors, an incorrect sensor air gap, or a damaged tone ring.
Will clearing the DTC permanently fix C0047?
No. Clearing the code only removes it temporarily. If the low-voltage condition remains, the ABS module will detect the fault again during the next self-test.