Code
C0050
DAEWOO
C — Chassis
Right rear wheel speed sensor circuit malfunction
Views:
UK: 5
EN: 7
RU: 4
AI status
Completed
Completed
100%
Causes
- Faulty right rear wheel speed sensor
- Open or short in the sensor wiring harness
- Corroded or loose connector at sensor or ABS module
- Damaged or missing tone ring/reluctor wheel
- Contamination (metal shavings, debris) on sensor/reluctor
- Faulty ABS/traction control module or internal connector
Symptoms
- ABS warning lamp illuminated
- Traction control or stability control warning and/or disabled
- Reduced braking/ABS function during heavy braking
- Inconsistent or zero speed reading from that wheel in scan tool live data
- Possible grinding/metal debris near wheel hub (if tone ring damaged)
What to check
- Read stored and pending codes with a scan tool; freeze frame/live data for wheel speeds
- Visually inspect right rear wheel, hub, sensor and wiring harness for damage, corrosion or disconnection
- Back-probe sensor connector and check for proper reference voltage and ground (if active type)
- Measure sensor resistance (if passive) and compare to specification
- Spin the wheel while watching live wheel speed sensor signal (scan tool or oscilloscope)
- Inspect tone ring/reluctor for missing or damaged teeth and for metallic debris
Signal parameters
- Passive (magnetic) sensor resistance: typical ~800–2000 Ω (manufacturer specif. required)
- Passive sensor AC output: ~0.2–2.0 Vrms at low speeds, increasing with wheel speed
- Active (Hall) sensor output: square wave pulses 0–5 V (or 0–12 V on some systems) referenced to sensor ground
- Reference/supply voltage for active sensor: typically ~5 V (check vehicle spec)
- Signal frequency: proportional to wheel speed — tens to hundreds of Hz at road speeds (depends on reluctor tooth count)
Diagnostic algorithm
- Connect a scan tool and confirm C0050; view live data for all wheel speeds — note if right rear shows no/erratic signal
- Visually inspect right rear sensor, connector, wiring and tone ring for damage, corrosion, loose clips or debris
- Unplug connector, inspect and clean terminals; reconnect and check for code return and live data change
- Measure sensor resistance (with connector disconnected) and compare to spec. If open or shorted, replace sensor
- If passive sensor, spin wheel and measure AC voltage at sensor connector; if active, back-probe and observe square wave signal with scope or scan tool while spinning wheel
- Check supply/reference voltage and ground to the sensor (with ignition on). No supply or poor ground indicates wiring or module issue
- Wiggle the wiring and connector while monitoring live data to find intermittent shorts/opens
- Inspect the tone ring for missing/damaged teeth or heavy rust/debris; repair or replace if damaged
- If wiring and sensor test good, check continuity from sensor connector to ABS module pin and inspect module connector for corrosion/damage
- If doubt remains, swap a known-good sensor from another wheel (if identical) and re-test to isolate sensor vs. wiring/module
- After repair, clear codes and test drive to verify proper wheel speed readings and that the code does not return
Likely causes
- Broken or chafed wiring leading to right rear sensor
- Corroded/loose sensor connector
- Failed wheel speed sensor (open circuit or short)
- Damaged or missing reluctor/tone ring teeth
- Sensor contaminated/mispositioned after brake/rotor service
Fault status
Status
Right rear wheel speed sensor circuit malfunction detected. ABS/traction control functions may be affected.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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