Code
C0051
DAEWOO
C — Chassis
Right rear wheel speed sensor circuit malfunction
Views:
UK: 7
EN: 7
RU: 20
AI status
Completed
Completed
100%
Causes
- Failed or damaged right rear wheel speed sensor
- Open, shorted, or chafed wiring between sensor and ABS module
- Corroded, loose or contaminated sensor connector
- Damaged or missing tone (reluctor) ring / reluctor teeth
- Faulty ABS/traction control module or internal driver failure
- Damaged wheel bearing affecting sensor air gap or mounting
Symptoms
- ABS warning lamp illuminated
- Traction control / ESC warning lamp illuminated or disabled
- Intermittent or constant ABS activation under braking
- Vehicle stability or traction assist reduced
- Possible speedometer or cruise control faults (model dependent)
- Noisy wheel bearing or unusual vibration (if bearing-related)
What to check
- Read and record freeze-frame and live data with a scan tool; note right rear wheel speed value vs other wheels
- Visually inspect sensor, connector, and wiring for damage, corrosion or loose pins
- Check connector for water ingress, bent pins, corrosion and secure mating
- Measure sensor resistance (for passive sensors) and compare to specification
- Back-probe connector while spinning wheel to observe AC or digital signal with DVM or oscilloscope
- Check supply/reference voltage and ground at the sensor connector with key on
Signal parameters
- Passive (variable reluctance) sensors: typical DC resistance often in the range of several hundred to a few thousand ohms (varies by model); produces AC voltage when wheel rotates (low speed ~0.1–1.0 Vrms increasing with speed).
- Active (Hall-effect or magnetoresistive) sensors: typically output a digital square wave or 0–5 V (or 0–12 V depending on vehicle) signal; frequency increases with wheel speed.
- Expected waveform: clean alternating waveform (passive) or stable square wave with consistent amplitude and frequency (active) with no erratic drops or noise.
- Exact resistance/voltage/frequency specifications vary by model—refer to factory service data for manufacturer values.
Diagnostic algorithm
- Connect a scanner, read codes and live data; confirm C0051 and compare RR wheel speed to other wheels at rest and while rolling.
- Visually inspect RR sensor, connector and harness for damage, corrosion, or contamination; repair any obvious issues.
- With ignition ON, measure reference voltage and ground at the sensor connector; verify proper voltages per factory specs.
- For passive sensors: unplug sensor and measure DC resistance across sensor terminals; compare to spec. For active sensors: check output waveform while spinning wheel (use oscilloscope if available) or measure AC/ DC output with multimeter while wheel is rotated.
- Back-probe connector and spin wheel (or lift vehicle safely and rotate wheel) to confirm signal present and consistent. Perform wiggle test on the harness to reproduce intermittent faults.
- Check continuity between sensor connector and ABS module pin; repair any open/shorted wiring and restore secure grounds.
- Inspect tone/reluctor ring for damage, missing teeth, or large air gap; correct or replace as required. Check wheel bearing condition if ring movement is present.
- If wiring and tone ring are good, replace the right rear sensor with a known-good unit and retest.
- Clear codes, perform road test and monitor live data to confirm fault cleared and proper wheel speed signals.
- If problem persists after sensor and wiring repairs, consider ABS module or internal driver diagnosis by qualified technician.
Likely causes
- Sensor damaged by road debris, corrosion or impact
- Connector contaminated with water/corrosion causing intermittent contact
- Wiring harness abrasion or pinched wires at suspension or axle
- Reluctor ring bent, cracked, missing teeth, or filled with rust/metal shavings
- Poor grounding at chassis or ABS module
Fault status
Status
C0051 — Right rear wheel speed sensor circuit malfunction detected. Possible open, short, intermittent signal, or sensor/reluctor fault. ABS/ESC systems may be disabled.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
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