C0496

Code

Generic C — Chassis

Rear right wheel speed sensor circuit intermittent

Brand: Generic

Type: C — Chassis

Views: UK: 16 EN: 10 RU: 8

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ABS and/or traction control warning lamp illuminated intermittently or steady
Intermittent or sporadic ABS activation during braking
Speedometer/vehicle speed reading erratic on some vehicles or inconsistent wheel speed readings in scan tool
Reduced or disabled ABS/traction control functionality
Possible brake pulsation or unexpected stability control events under certain conditions

Read and record freeze-frame and live data with a scan tool focusing on rear right wheel speed value
Clear the code and perform a road test to see if the code returns and when
Visually inspect rear right sensor, connector and harness for damage, corrosion, deformation or contamination
Wiggle the wiring harness and connectors while watching live wheel speed data to reproduce the intermittent behavior
Inspect the wheel/tone ring for missing or damaged teeth, heavy corrosion, or contamination
Measure sensor resistance and compare with specification, and check for short to ground or battery at the harness connector

Passive (magnetic) sensor: DC resistance typically ~800–2000 ohms (vehicle-specific) — expect an AC sine/triangle waveform when wheel turns; amplitude increases with speed
Active (Hall/active) sensor: reference voltage typically 5 V (or 12 V in some systems); signal is a square wave switching between ~0–5 V (verify vehicle spec)
Air gap: commonly 0.5–2.0 mm (vehicle-specific) — excessive gap reduces signal amplitude and causes dropouts
Oscilloscope: clean waveform with amplitude and frequency proportional to wheel speed; intermittent dropouts, noise spikes, or missing pulses indicate problem

Connect a scan tool, read and record C0496 and any related codes, check live rear right wheel speed while rotating wheel by hand or during road test.
Clear codes and attempt to re-create. Note conditions when code sets (cold, wet, turning, over bumps) to guide visual inspection.
Visually inspect rear right sensor, connector and harness for damage, moisture, corrosion, crushed wires or pinch points. Repair any obvious damage.
Backprobe sensor connector: for passive sensor measure DC resistance across sensor terminals; for active sensor check reference supply and ground, then observe signal voltage while rotating wheel. Compare to vehicle specs.
Wiggle the harness, connector and move suspension while watching live data/oscilloscope to find intermittent failures. Pay attention to grounding points and nearby connectors.
Inspect reluctor (tone) ring at the wheel hub and ABS toothed ring on the axle for missing teeth, cracks, heavy rust or debris. Clean or replace as needed.
If sensor and tone ring look OK but signal is noisy or intermittent, use an oscilloscope to confirm waveform integrity at speed; replace sensor if waveform is poor.
Repair wiring: fix chafed wires, reseal or replace corroded connectors, and secure harness away from moving parts. Replace tone ring or hub assembly if damaged.
After repairs, clear codes and road test to confirm no recurrence. If intermittent persists, consider module connector checks or ABS module bench tests/replace as last resort.