C2422

Code

Generic C — Chassis

Rear Right Wheel Speed Sensor Circuit Intermittent

Brand: Generic

Type: C — Chassis

Views: UK: 13 EN: 35 RU: 21

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Page language: EN

Causes

Damaged, corroded or loose wheel speed sensor connector or wiring
Faulty wheel speed sensor (internal intermittent failure)
Contaminated or damaged tone ring/reluctor (missing teeth, debris, rust)
Intermittent power, reference, or ground to an active sensor
Poor chassis ground or module connector issue
Intermittent fault inside ABS/traction control module

Symptoms

ABS/traction control warning lamp illuminated intermittently
ABS or traction control may activate unexpectedly or be disabled
Selective stability control faults or reduced braking/ESC performance
Possible inconsistent speedometer/driveability issues on some vehicles
Fault clears or returns depending on road conditions and wheel movement

What to check

Read and record freeze frame and live data with a scan tool; note when the code sets
Visually inspect rear right wheel area: sensor, tone ring, wiring, and connector
Check connector for corrosion, water intrusion, or loose pins
Wiggle test harness and connector while monitoring live wheel speed data
Verify proper vehicle lifting and support before accessing wheel hub (use jack stands)

Signal parameters

Passive (magnetic) sensor: variable AC voltage amplitude increasing with wheel speed (typical ~0.2–12 V AC peak depending on speed and design); frequency proportional to wheel RPM
Active (hall/linear) sensor: digital square wave or pulse 0–5 V (or 0–12 V on some systems); ~50% duty cycle common; frequency proportional to wheel RPM
Typical passive sensor DC resistance often in the 800–2000 Ω range (varies by manufacturer); consult service manual for exact specs
Expected clean waveform on oscilloscope: stable amplitude and frequency proportional to wheel speed without dropouts or noise

Diagnostic algorithm

Retrieve codes and live data: use a diagnostic scan tool to monitor rear right wheel speed value and compare to other wheels during slow forward and reverse movement.
Visual inspection: check sensor, tone ring, hub, and wiring for damage, missing teeth, metal debris, or heavy corrosion at the connector.
Wiggle test: with ignition on and scanner monitoring wheel speed, gently move the harness/connector and spin the wheel; watch for dropouts or erratic readings to replicate intermittent behavior.
Connector check: disconnect sensor connector, inspect terminals for corrosion, bent pins, moisture, or play. Clean and reconnect securely.
Resistance and short checks (safe, performed with ignition off): measure sensor resistance (compare to service spec) and check for short to ground or short to supply.
Active sensor supply/reference check: for active sensors, verify proper reference voltage and ground at connector with ignition on (consult vehicle manual for expected voltage).
Dynamic output test: spin the wheel (or road test) and measure AC output (passive) or pulse signal (active) with oscilloscope; look for missing pulses, noise, or amplitude collapse.
Inspect tone ring: check for damage, loose mounting, excessive runout, or metal contamination; repair or replace as required.
Repair suspected wiring or connector faults: repair chafed wires, replace damaged connectors or sensor as needed. After repair, clear codes and perform test drive to confirm.
If intermittent persists after sensor/harness repairs, test ABS module inputs and grounds; consider module replacement or professional module testing as last resort.