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Home / DTC / C0120 — Right Rear Wheel Speed Sensor Circuit

C0120 — Right Rear Wheel Speed Sensor Circuit

Detailed page for trouble code C0120.

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Code

C0120

Generic C — Chassis

Right Rear Wheel Speed Sensor Circuit

Brand: Generic
Type: C — Chassis
Views: UK: 10 EN: 14 RU: 13
AI status
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Page language: EN

Causes

  • Damaged or disconnected right rear wheel speed sensor
  • Broken, shorted or corroded wiring or connector at the sensor
  • Contaminated or corroded sensor connector pins
  • Damaged or missing tone ring/reluctor (cracked, magnetized debris, missing teeth)
  • Faulty wheel bearing causing sensor misalignment or excessive air gap
  • Poor ground or reference voltage from ABS module

Symptoms

  • ABS warning lamp illuminated
  • Traction control / ESP light on or disabled
  • ABS may engage erroneously or not engage when expected
  • Cruise control disabled (on some vehicles)
  • Inconsistent speed readings in ABS live data for the right rear wheel
  • Occasional or constant fault stored; possible intermittent operation

What to check

  • Retrieve all ABS/traction codes and freeze-frame data with a scan tool
  • Visually inspect right rear sensor, harness and connector for damage, corrosion, contamination or loose mounting
  • Check for physical damage or missing teeth on the tone ring/reluctor
  • Check for excessive wheel bearing play or rotor/hub movement
  • Back-probe connector and verify reference voltage (typically 5V) and ground (if active sensor) with ignition on
  • Measure sensor resistance (for passive sensors) and compare to spec

Signal parameters

  • Passive (magnetic/VR) sensor: resistance typically 800–2000 ohms (varies by vehicle). AC output increases with speed; low-speed output may be a few hundred mV AC, rising to 1–4 VAC+ at higher speeds.
  • Active (Hall-effect/active) sensor: digital square wave, typically 0–5V (some systems 0–12V). Frequency is proportional to wheel speed.
  • Reference voltage (for active sensors): typically ~5V from ABS module with stable ground.
  • Expected behavior: clean periodic waveform or AC signal proportional to wheel speed, no dropouts, not stuck high/low.

Diagnostic algorithm

  1. Read codes and live data: confirm C0120 and check for related codes (other wheel sensors, module errors).
  2. Visual inspection: check harness, connector, sensor mounting, tone ring and bearing for obvious damage or contamination.
  3. Connector check: disconnect sensor, inspect pins for corrosion, bent pins, moisture; clean or repair as needed.
  4. Resistance/continuity: measure sensor resistance (if passive) and compare to vehicle specification; check harness continuity to ABS module and for shorts to ground or battery positive.
  5. Voltage/reference check: with connector connected and ignition ON, back-probe to verify reference voltage and ground (active sensors) and proper pull-up/pull-down behavior.
  6. Dynamic signal test: jack vehicle safely, spin wheel and observe signal with an oscilloscope or multimeter (AC mode for VR sensor or scope for waveform). Look for clean amplitude/frequency and no dropouts while spinning.
  7. Wiggle test: while monitoring signal, move the harness and connector to locate intermittent wiring faults.
  8. Tone ring check: inspect/replace hub or tone ring if damaged or missing teeth; verify proper air gap between sensor and tone ring.
  9. Repair: repair or replace damaged wiring/connector, replace sensor, or replace hub/tone ring as indicated.
  10. Clear codes and road test: erase codes, perform road test and re-scan to confirm fault does not return.
  11. If fault persists after sensor/harness repair, test/scan ABS module operation and grounding; consider module replacement only after wiring and sensors are verified good.

Likely causes

  • Open or short in sensor wiring or connector (most common)
  • Failed wheel speed sensor
  • Corroded connector or pin(s)
  • Damaged tone ring/reluctor or excessive sensor-to-reluctor air gap

Fault status

⚠️ Status
Right Rear Wheel Speed Sensor Circuit — open, short, intermittent signal or missing/incorrect sensor output detected by ABS/traction control system.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours
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