C0735

Code

Generic C — Chassis

ABS Rear Right Wheel Speed Sensor Circuit

Brand: Generic

Type: C — Chassis

Views: UK: 27 EN: 26 RU: 18

AI status

Completed

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Page language: EN

Causes

Damaged or failed rear right wheel speed sensor
Open, shorted or chafed wiring harness to the sensor
Corroded or loose connector at the sensor or ABS module
Damaged or missing tone/ring teeth (reluctor) on hub or axle
Poor ground or reference voltage to the sensor
Faulty ABS/traction control module or internal driver circuitry

Symptoms

ABS warning lamp illuminated (may also show traction control/ESC light)
Reduced or disabled ABS/traction control functions
Inconsistent or zero wheel speed reading for rear right wheel on scan tool
Possible stability control faults, ABS activation not available
In some vehicles, cruise control or speed-related features may be inhibited

What to check

Use a scan tool to read ABS codes and view live wheel speed sensor data; compare all four wheel speeds at low roll speed
Visually inspect sensor, connector, and wiring for damage, corrosion, or contamination
Wiggle harness and connector while monitoring signal to reproduce intermittent faults
Check connector pins for corrosion, bent pins or poor contact
Measure sensor DC resistance (if passive type) or check reference voltage and signal (if active type) at the connector
Check continuity and for short to chassis ground between sensor and ABS module

Signal parameters

Passive (magnetic/VR) sensor: DC resistance typically ~500–2,000 ohms (varies by vehicle); produces AC voltage that increases with wheel speed — low-speed AC should be measurable (tens to hundreds of mV up to volts at higher speed)
Active (hall or magnetoresistive) sensor: requires reference voltage (commonly ~5 V) and ground; outputs a pulse/square wave signal 0–5 V (or pull-up to module supply) with frequency proportional to wheel speed
With wheel rotated by hand: passive sensor should show a small AC voltage on an oscilloscope; active sensor should show switching waveform on scope or pulses on scan tool
No signal, constant voltage, or excessive noise/erratic waveform indicates fault in sensor, wiring, or tone ring

Diagnostic algorithm

Connect a scan tool, read ABS codes and view live data. Note rear right wheel speed value at rest and while slowly rolling the vehicle — compare to other wheels.
Visual inspection: raise and support vehicle safely, remove wheel if needed. Inspect sensor and harness for physical damage, contamination, connector corrosion or loose mount.
Backprobe the sensor connector (with connector connected) and verify reference voltage and ground (for active sensors) or measure DC resistance across sensor terminals (for passive sensors) with connector disconnected.
Rotate the wheel by hand and monitor signal with a multimeter (AC) or oscilloscope (preferred). A passive sensor should produce an AC voltage that rises with speed; an active sensor should produce a square/pulse waveform.
Wiggle the wiring and connectors while watching the live data/signal to detect intermittent opens/shorts.
Check continuity from the sensor connector to the ABS module pin and check for shorts to ground/power.
Inspect the tone ring/reluctor on hub/drive flange for missing teeth, heavy corrosion or debris; clean or replace if damaged.
If wiring, connectors and sensor test OK, suspect ABS module driver — verify with module bench tests or consult vehicle-specific service information before replacing module.
Replace the faulty component (sensor, wiring/connector, tone ring or module) as identified, clear codes and perform road test to confirm repair.

Likely causes

Contaminated/corroded sensor connector or wiring (most common)
Broken/chafed wiring where harness flexes
Failed wheel speed sensor from impact or internal failure
Damaged tone ring (rust, missing teeth) causing no/erratic signal
Fault in ABS module (least common)

Fault status

⚠️ Status

ABS rear right wheel speed sensor circuit fault detected (open/short/no signal). ABS/traction control system may be disabled or operate with limited functionality.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5–2 hours