C2735

Code

Generic C — Chassis

Right Rear Wheel Speed Sensor Circuit Fault

Brand: Generic

Type: C — Chassis

Views: UK: 12 EN: 16 RU: 11

AI status

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Page language: EN

Causes

Open or shorted wheel speed sensor wiring
Corroded, loose or damaged connector at sensor or harness
Failed wheel speed sensor (active or passive)
Damaged tone ring/reluctor (missing teeth, heavy rust, debris)
Faulty wheel hub or bearing with integrated sensor
Poor ground or missing reference supply from ABS/ECU

Symptoms

ABS warning lamp illuminated
Traction control/ESP warning lamp illuminated
Reduced or disabled ABS and traction functions
Intermittent or no vehicle speed display (on some vehicles)
Erratic braking behavior under ABS activation
Code present only at low speed or present continuously

What to check

Scan ABS/BCM/ECU for related codes and freeze frame data
Visually inspect right rear sensor, connector and wiring for damage or corrosion
Check for missing or damaged tone ring/reluctor teeth and heavy rust/debris
Wiggle test wiring while observing live wheel speed data for dropouts
Check sensor harness ground and supply/reference voltages
Measure sensor resistance and compare to expected range

Signal parameters

Passive (variable reluctance) sensor: DC resistance typically ~800–1500 Ω (manufacturer dependent)
Passive sensor AC output: ~0.1–1.5 VAC at low speeds, rising with wheel speed
Active (Hall/VR with electronics) sensor: square wave 0–5 V or 0–12 V depending on system
Reference supply (for active sensors): commonly 5 V or 12 V with ground return
Frequency: rises proportionally with wheel speed (tens to thousands of Hz depending on vehicle)
Nominal signal should be steady and symmetrical; intermittent drops or noise indicate wiring/sensor issues

Diagnostic algorithm

Retrieve codes and live data with a scan tool; note when the code sets and any freeze frame (speed, voltage, temp).
Visually inspect the right rear sensor, harness routing, clips, and connector for damage, corrosion or pinch points.
With connector disconnected, check connector terminals for corrosion, bent pins, or water intrusion; repair or replace as needed.
Measure sensor resistance (if passive) at the sensor connector and compare to spec; infinite = open, near zero = short.
For active sensors, backprobe connector and check reference supply voltage and ground with ignition on; should see specified reference (commonly 5V or 12V).
Use an oscilloscope (preferred) or multimeter AC mode while rotating wheel: confirm a clean, proportional waveform/frequency. Wiggle the harness to reproduce intermittent faults.
Inspect the tone ring/reluctor for damage, missing teeth, heavy rust or metal debris; spin the hub and inspect signal consistency.
If wiring checks fail, perform continuity/resistance test from sensor connector to ABS/ECU connector; repair any opens/shorts and ensure good grounds.
Clear codes and perform road test to verify proper wheel speed signal and that the code does not return. Re-scan after test.
If sensor and wiring good but fault persists, suspect ABS module driver fault and consult manufacturer procedures for module testing or replacement.

Likely causes

Damaged/contaminated connector at right rear sensor
Broken wiring or chafed harness near suspension or wheel
Failed wheel speed sensor (moisture ingress or worn sensor)
Damaged reluctor/ABS tone ring on the hub
Bad ground or supply to the sensor circuit

Fault status

⚠️ Status

Right rear wheel speed sensor circuit fault detected. ABS/traction control may be disabled. Check sensor, wiring, and tone ring for open/short/intermittent signals.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-3 hours