Code
C0471
Generic
C — Chassis
Right Rear Wheel Speed Sensor Circuit Fault
Views:
UK: 14
EN: 38
RU: 15
AI status
Completed
Completed
100%
Causes
- Damaged or corroded sensor connector
- Broken, pinched or chafed wiring between sensor and ABS module
- Faulty wheel speed sensor (VR or Hall type)
- Contaminated, cracked, or damaged tone ring/reluctor
- Short to battery or ground, or open circuit
- Faulty ABS/traction control module or poor module ground
Symptoms
- ABS, traction control or stability warning lamp illuminated
- ABS or traction control may be disabled or operate incorrectly
- Inconsistent or no speed reading for right rear on scan tool
- Possible ABS activation at low speeds or pulsation
- Speedometer usually unaffected if vehicle uses separate vehicle speed sensor
What to check
- Read and record stored codes and freeze-frame data with a scan tool
- Visual inspection of right rear sensor, tone ring and wiring harness
- Check connector for corrosion, bent pins or water intrusion
- Wiggle test wiring while monitoring live wheel speed data for dropouts
- Measure sensor resistance (if passive) and compare to spec
- Backprobe sensor with oscilloscope or scan tool while rotating wheel
Signal parameters
- Passive (VR) sensor: AC voltage amplitude increases with speed; low-speed AC ~0.1–2 VAC, higher speeds several volts (varies by design). Coil resistance often hundreds to thousands of ohms (consult vehicle spec).
- Active (Hall/3‑wire) sensor: 5 V reference, ground, and square/pulse signal; signal typically 0–5 V (or 0.2–4.8 V) pulsing with wheel rotation.
- Signal frequency proportional to wheel speed; frequency and pulse count depend on tone ring tooth count.
- Intermittent, missing pulses, constant high/low voltage, or open/short readings indicate a fault.
Diagnostic algorithm
- Connect a diagnostic scan tool and record C0471 and any related codes; note freeze-frame and live data for right rear wheel speed.
- Perform a visual inspection: check sensor mounting, gap to tone ring, damaged teeth, debris, and connector condition.
- Wiggle the wiring harness and connector with ignition on while monitoring live wheel speed data for dropouts or changes.
- Unplug connector and check for corrosion or bent pins. Clean and reseat connector; repair as needed.
- Measure sensor resistance (passive VR) with multimeter; compare to factory spec. For active sensors, verify 5 V reference and ground at connector.
- Backprobe the signal wire and observe with oscilloscope (preferred) or scan tool while spinning the wheel. Look for clean alternating waveform (VR) or square pulses (Hall).
- Check continuity between sensor connector and ABS module; measure for shorts to ground or 12 V.
- Inspect tone ring for damage, missing teeth, or excessive corrosion; repair or replace if out of tolerance or misaligned.
- If wiring and tone ring are good but signal is faulty, replace the right rear wheel speed sensor and retest.
- After repairs, clear codes and perform road test while monitoring wheel speed signals to verify proper operation.
Likely causes
- Corroded/damaged connector or wiring at right rear hub
- Failed right rear wheel speed sensor (most common)
- Contaminated or damaged reluctor/tone ring (dents, missing teeth, debris)
- Intermittent wiring fault due to chafing or connector moisture
Fault status
Status
C0471 — Right Rear Wheel Speed Sensor Circuit Fault detected by ABS module: signal missing, out-of-range, open/short or intermittent.
Repair difficulty: Medium
Diagnostic time: 0.5–1.5 hours
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