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Home / DTC / C1B15 — Front right wheel speed sensor circuit intermittent

C1B15 — Front right wheel speed sensor circuit intermittent

Detailed page for trouble code C1B15.

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C1B15

LAND ROVER C — Chassis

Front right wheel speed sensor circuit intermittent

Brand: LAND ROVER
Type: C — Chassis
AI status
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Page language: EN

Causes

  • Damaged or contaminated front right wheel speed sensor
  • Broken, chafed or pinched wiring harness to the sensor
  • Corroded or loose connector pins at the sensor or chassis harness
  • Damaged or missing tone/ring wheel (ABS reluctor) or foreign debris on tone ring
  • Wheel bearing damage allowing sensor misalignment or metal debris
  • Intermittent power/ground or control module connector issue

Symptoms

  • ABS, DSC or traction control warning lamp illuminated
  • Intermittent loss of ABS or traction control intervention
  • Possible ABS/ESC faults saved in module memory
  • Unstable or jerky brake or stability control behavior under low traction
  • Occasional false wheel speed readings or inconsistent live-data values for front right wheel

What to check

  • Read stored and freeze-frame fault data with a capable scan tool; note when the fault occurs
  • Visually inspect sensor, wiring and connector at the front right wheel for damage, corrosion or contamination
  • Check sensor mounting and tone ring for damage, missing teeth, heavy rust or debris
  • Monitor wheel speed live data while rotating the wheel (road test or lift and spin) for dropouts or erratic signals
  • Perform a wiggle test on the harness while watching live data to reproduce the intermittent fault
  • Measure sensor resistance/continuity and check for short to chassis (refer to factory specs)

Signal parameters

  • Passive (variable reluctance) sensor: AC voltage that varies with wheel speed; low speed = tens to hundreds of mV, higher speed = up to several volts (frequency increases with speed)
  • Active (Hall/magnetoresistive) sensor: digital pulsed output (typically a square wave) referenced to module ground; output typically 0–5 V or vehicle supply dependent
  • Typical passive sensor DC resistance (rough guidance): several hundred to a few thousand ohms — consult the vehicle service manual for exact resistance
  • Signal characteristic to check: clean consistent pulse/train with amplitude/frequency proportional to wheel rotation; intermittent missing pulses indicate circuit/sensor/tone ring issues
  • Always confirm exact voltage/resistance/waveform specs from manufacturer documentation before replacing components

Diagnostic algorithm

  1. Connect a diagnostic scan tool, read/record C1B15 and any related codes, and review freeze-frame/live data.
  2. Visually inspect the front right sensor, harness, and connector for damage, corrosion, or contamination; repair visible damage.
  3. With the ignition on, backprobe the sensor connector: verify sensor supply voltage and good ground (for active sensors).
  4. Measure sensor resistance (with harness disconnected). Compare to factory spec. Look for open or short to chassis.
  5. Lift vehicle and rotate the front right wheel by hand (or road test). Observe wheel speed data for dropouts; perform wiggle test on harness to reproduce intermittent behavior.
  6. Use an oscilloscope across the sensor output while spinning wheel to inspect waveform for missing pulses, noise or irregular amplitude. Check tone ring gap and condition.
  7. Repair identified wiring/connector faults (replace damaged section, reseal connectors) or clean/replace sensor or tone ring as required.
  8. After repair, clear codes and perform verification road test and live-data monitoring to confirm the fault does not recur.
  9. If wiring and sensor check good but the fault persists, inspect ABS control module connectors and wiring at the module; consider module fault testing as last resort.

Likely causes

  • Wiring damage where harness flexes (typical at steering knuckle or suspension articulation)
  • Connector corrosion or poor pin contact at sensor connector
  • Sensor damaged by impact or contaminated with metallic debris
  • Tone ring cracked, bent, or contaminated causing inconsistent pulses
  • Loose ground or poor supply to active sensor

Fault status

⚠️ Status
Front right wheel speed sensor circuit intermittent. The wheel speed signal is intermittently missing or unstable. This can disable ABS/traction control features and trigger warning lamps. Inspect sensor, wiring/connector, tone ring and related circuitry.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.0 hours

Similar codes

C0035 C0040 C0050 C0055 U0121
320

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