Code
C2003
LAND ROVER
C — Chassis
Right Rear Wheel Speed Sensor Circuit Fault
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UK: 9
EN: 9
RU: 10
AI status
Completed
Completed
100%
Causes
- Failed or intermittent wheel speed sensor (right rear).
- Open, short or high resistance in sensor wiring or poor connector contacts.
- Corroded or contaminated connector terminals.
- Damaged or distorted tone/reluctor ring (missing teeth, heavy rust or debris).
- Wheel bearing or hub play causing sensor gap/position change.
- Faulty ABS/traction control module or internal driver failure.
Symptoms
- ABS warning lamp illuminated; possibly Traction Control/ESC lamp.
- Loss or intermittent operation of ABS/traction control for that wheel.
- Inconsistent or zero speed reading for right rear wheel on scan tool live data.
- ABS activation may be disabled or behave incorrectly during braking.
- Possible vehicle stability or traction events flagged.
What to check
- Read and record all stored codes and freeze frame data with a capable scan tool.
- Confirm presence and behavior of ABS/ESC warning lamps on key‑on/start.
- Visually inspect the right rear sensor, tone ring, wheel hub and connector for damage, dirt, corrosion or loose mounting.
- Check for rodent or chafing damage to wiring along suspension and underbody harness routes.
- Compare live wheel speed readings for all four wheels while gently rolling or driving (on a lift or road test) to confirm which sensor is faulty.
- Measure connector terminals for reference voltage, ground continuity and signal output with a multimeter or oscilloscope.
Signal parameters
- Passive (magnetic) sensor: DC resistance typically ~500–2,000 Ω (varies by model); generates an AC sine wave whose amplitude increases with wheel speed (tens of mV at very low rpm up to ~1 V or more at higher speed).
- Active (Hall/VR with electronics) sensor: typically uses a 5 V reference (or vehicle reference) and outputs a digital/square wave or variable voltage 0–5 V (some systems use 0.5–4.5 V); frequency proportional to wheel speed.
- Typical signal frequency range: 0–1,000+ Hz depending on speed and tone ring tooth count.
- If using oscilloscope: expect a clean alternating waveform (passive) or regular square/pulse pattern (active) with no long dropouts or large noise spikes.
Diagnostic algorithm
- Safety first: park on level surface, chock wheels, lift vehicle and support on stands before working under it.
- Connect a diagnostic scan tool; read and note all ABS/traction codes and freeze frame data. Clear codes if requested and reattempt to capture conditions.
- Inspect the right rear wheel speed sensor, harness, and connector for mechanical damage, contamination, corrosion or loose mounting. Repair any obvious issues.
- With connector disconnected, check for continuity between sensor connector and ABS module connector pins (consult vehicle wiring diagram for pin locations). Verify there is no short to ground or battery voltage on the signal wire.
- If sensor is passive: measure DC resistance of sensor. Compare to specification (typical range noted above). If open or shorted, replace sensor.
- With wheel lifted and safely supported, spin the wheel by hand while probing the sensor output with an oscilloscope or AC voltmeter. For passive sensors expect an AC waveform; for active sensors expect a pulsed DC signal. Look for consistent amplitude/frequency and no dropouts.
- Wiggle the harness and connectors while monitoring signal to check for intermittent faults.
- Inspect the tone/reluctor ring for missing teeth, heavy rust, buildup or distortion and correct air gap. Repair or replace ring/hub assembly if damaged.
- If sensor and wiring test good but code persists, check reference power and ground at module and verify module connector integrity. Perform module input diagnostics per factory procedure.
- After repairs or replacements, clear codes, perform road test and re-scan to ensure the fault does not return and wheel speed data is normal and consistent with other wheels.
Likely causes
- Sensor connector corrosion or damaged wiring at right rear hub.
- Failed right‑rear wheel speed sensor due to contamination or impact.
- Reluctor ring damage or excessive air gap from bearing/hub wear.
- Open or short to ground/power in the right rear sensor circuit.
Fault status
Status
Right rear wheel speed sensor circuit fault detected — ABS/traction control module has recorded an error with the right‑rear wheel speed sensor input.
Repair difficulty: Medium
Diagnostic time: 1.0-2.0 hours
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