Code
C0223
Generic
C — Chassis
Right Rear Wheel Speed Sensor Circuit Malfunction
Views:
UK: 5
EN: 4
RU: 2
AI status
Completed
Completed
100%
Causes
- Damaged or shorted wiring to right rear wheel speed sensor
- Corroded, loose or contaminated connector at sensor or ABS module
- Failed wheel speed sensor (Hall or variable-reluctance)
- Damaged/missing tone/reluctor ring or debris obstructing it
- Faulty ground or reference supply to the sensor
- Intermittent connection due to wheel bearing or hub damage
Symptoms
- ABS warning lamp ON
- Traction control/stability control warning or disabled
- Inoperative or reduced ABS function under braking
- Illogical wheel speed reading for the right rear wheel in scanner/live data
- Traction control/ABS activation when not required
- Possible speedometer anomalies on some vehicles
What to check
- Read and record freeze-frame and all stored ABS/ESC codes with a scan tool
- Visually inspect wiring and connector at the right rear wheel and at the ABS module for damage, corrosion, or disconnection
- Check for obvious mechanical damage to the hub, tone ring, and wheel bearing
- Backprobe sensor connector and observe live wheel speed data while spinning wheel by hand or during road test
- Measure sensor resistance (for VR type) and compare to spec; check reference voltage and signal for Hall-type sensors
- Perform continuity check and wiggle test on harness to detect intermittent opens/shorts
Signal parameters
- Variable Reluctance (VR) sensor: DC resistance typically ~500–2000 Ω (vehicle-specific) — produces AC sine/sinusoidal voltage when wheel is spun; amplitude increases with speed (tens of mV to several volts AC)
- Hall-effect sensor: requires ~5V reference (some use battery voltage) and ground; output is a square/pulse signal 0–5V (or 0–Vbat) with frequency proportional to wheel speed
- Typical expected behaviors: signal frequency proportional to wheel rpm, no signal at zero speed, smoothly varying amplitude/voltage with no dropouts or noise spikes
Diagnostic algorithm
- Verify code C0223 present and note freeze-frame data; check for other related C0xxx codes
- Visually inspect right rear sensor, connector, tone ring, and harness for damage or contamination
- With key ON (engine off), backprobe sensor connector: for Hall type verify reference (~5V) and ground present; for VR verify sensor resistance within specification
- Spin the wheel by hand while observing live data or oscilloscope: VR should show AC waveform; Hall should show pulsed square waveform. Look for clean, continuous signal
- If no/erratic signal, perform continuity and short-to-ground/short-to-voltage checks on harness between sensor and ABS module; repair any wiring faults
- If wiring and power/ground are good but signal absent or out of spec, replace the right rear wheel speed sensor
- After repair, clear codes and perform road test or spin test to confirm correct wheel speed data and that the code does not return
- Only consider replacing the ABS/ESC module if wiring and sensor functionality are verified and module outputs/inputs are proven faulty
Likely causes
- Right rear wheel speed sensor failed
- Open or shorted sensor harness between wheel and ABS module
- Connector corrosion or bent terminals at sensor or module
- Damaged or missing tone ring on hub/axle
- Poor ground or missing reference voltage to sensor
Fault status
Status
Right rear wheel speed sensor circuit malfunction detected. ABS/traction control may be disabled for that wheel until the cause is corrected.
Repair difficulty: Medium
Diagnostic time: 0.5-3.0 hours
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Code
C0223
HUMMER
C — Chassis
C0223 — Wheel Speed Sensor Circuit Fault (ABS/Traction Control)
Views:
UK: 18
EN: 22
RU: 15
AI status
Completed
Completed
100%
Causes
- Damaged or shorted wiring to right rear wheel speed sensor
- Corroded, loose or contaminated connector at sensor or ABS module
- Failed wheel speed sensor (Hall or variable-reluctance)
- Damaged/missing tone/reluctor ring or debris obstructing it
- Faulty ground or reference supply to the sensor
- Intermittent connection due to wheel bearing or hub damage
Symptoms
- ABS warning lamp ON
- Traction control/stability control warning or disabled
- Inoperative or reduced ABS function under braking
- Illogical wheel speed reading for the right rear wheel in scanner/live data
- Traction control/ABS activation when not required
- Possible speedometer anomalies on some vehicles
What to check
- Read and record freeze-frame and all stored ABS/ESC codes with a scan tool
- Visually inspect wiring and connector at the right rear wheel and at the ABS module for damage, corrosion, or disconnection
- Check for obvious mechanical damage to the hub, tone ring, and wheel bearing
- Backprobe sensor connector and observe live wheel speed data while spinning wheel by hand or during road test
- Measure sensor resistance (for VR type) and compare to spec; check reference voltage and signal for Hall-type sensors
- Perform continuity check and wiggle test on harness to detect intermittent opens/shorts
Signal parameters
- Variable Reluctance (VR) sensor: DC resistance typically ~500–2000 Ω (vehicle-specific) — produces AC sine/sinusoidal voltage when wheel is spun; amplitude increases with speed (tens of mV to several volts AC)
- Hall-effect sensor: requires ~5V reference (some use battery voltage) and ground; output is a square/pulse signal 0–5V (or 0–Vbat) with frequency proportional to wheel speed
- Typical expected behaviors: signal frequency proportional to wheel rpm, no signal at zero speed, smoothly varying amplitude/voltage with no dropouts or noise spikes
Diagnostic algorithm
- Verify code C0223 present and note freeze-frame data; check for other related C0xxx codes
- Visually inspect right rear sensor, connector, tone ring, and harness for damage or contamination
- With key ON (engine off), backprobe sensor connector: for Hall type verify reference (~5V) and ground present; for VR verify sensor resistance within specification
- Spin the wheel by hand while observing live data or oscilloscope: VR should show AC waveform; Hall should show pulsed square waveform. Look for clean, continuous signal
- If no/erratic signal, perform continuity and short-to-ground/short-to-voltage checks on harness between sensor and ABS module; repair any wiring faults
- If wiring and power/ground are good but signal absent or out of spec, replace the right rear wheel speed sensor
- After repair, clear codes and perform road test or spin test to confirm correct wheel speed data and that the code does not return
- Only consider replacing the ABS/ESC module if wiring and sensor functionality are verified and module outputs/inputs are proven faulty
Likely causes
- Right rear wheel speed sensor failed
- Open or shorted sensor harness between wheel and ABS module
- Connector corrosion or bent terminals at sensor or module
- Damaged or missing tone ring on hub/axle
- Poor ground or missing reference voltage to sensor
Fault status
Status
Right rear wheel speed sensor circuit malfunction detected. ABS/traction control may be disabled for that wheel until the cause is corrected.
Repair difficulty: Medium
Diagnostic time: 0.5-3.0 hours
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