Code
C0732
Generic
C — Chassis
Right Rear Wheel Speed Sensor Circuit Open
AI status
Completed
Completed
100%
Causes
- Broken or damaged sensor wiring (open circuit)
- Disconnected, corroded or damaged connector at the sensor or harness
- Failed right rear wheel speed sensor (internal open)
- Damaged or missing tone/ring teeth (sensor cannot generate signal)
- Faulty ABS/traction control module or poor module connector pin
- Faulty wheel bearing causing sensor/air gap issues
Symptoms
- ABS warning lamp illuminated
- Traction/stability control warning or disabled
- No RR wheel speed reading in scan tool live data
- Possible ABS/traction faults during braking or cornering
- Speedometer usually unaffected unless vehicle uses that sensor for VSS
What to check
- Read/record stored codes and freeze-frame data with a scan tool
- Visually inspect RR sensor, tone ring, harness and connector for damage, corrosion, contamination or displaced clips
- Check connector continuity and pin condition; ensure connector fully seated
- Measure sensor resistance (ohmmeter) and compare to spec or look for open (infinite) reading
- With ignition ON, check for reference voltage/ground at sensor harness (if 3-wire sensor)
- Spin wheel and check for AC voltage (for 2-wire variable reluctor) or signal waveform (with scope) on signal wire
Signal parameters
- Passive 2-wire VR sensor: DC resistance typically 200–1500 ohms (varies by vehicle); produces AC voltage proportional to wheel speed (approx. 0.1–2.0 Vrms at low speeds, increases with speed)
- Active 3-wire Hall-effect or active sensor: 5V reference (sometimes 12V), ground and signal; signal is a pulsed/square waveform 0–5V (frequency proportional to wheel speed)
- Open-circuit symptom: infinite resistance on sensor circuit or no AC/square wave output when wheel rotated
- Intermittent wiring fault: erratic or missing pulses on oscilloscope trace
Diagnostic algorithm
- Verify the code with a scan tool and note any related ABS/traction codes.
- Visually inspect RR sensor, connector, harness routing, fasteners and tone ring for physical damage, corrosion, or contamination. Repair obvious issues.
- Disconnect the RR sensor connector. Measure sensor resistance across sensor terminals. An open (infinite) reading indicates a failed sensor.
- With connector still disconnected, back-probe the harness pins at the vehicle side. With ignition ON, check for reference voltage and ground (for active sensors). If no reference voltage, suspect wiring or ABS module output.
- Reconnect and spin the wheel by hand (or lift vehicle safely and rotate). Measure AC voltage on a 2-wire VR sensor or observe signal waveform on an oscilloscope for a 3-wire sensor. No output = open/faulty sensor or tone ring problem.
- Perform continuity check between sensor connector pin and ABS module connector pin to locate open wiring. Repair/replace any broken wiring or connector pins.
- Inspect/repair tone ring and wheel bearing as needed. Replace RR sensor if sensor tests open or fails to produce signal when spinning wheel.
- After repairs, clear codes, perform road test and monitor live data to confirm consistent RR wheel speed readings and that the code does not return.
Likely causes
- Open or broken sensor lead between RR sensor and ABS module
- Corroded or disconnected sensor connector at the hub
- Failed RR wheel speed sensor (internal open)
- Damaged tone ring or magnet on the RR wheel/hub
Fault status
Status
Right Rear Wheel Speed Sensor Circuit Open — no signal detected from RR wheel speed sensor circuit; ABS/traction control may be disabled.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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