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Home / DTC / C167500 — Signal Wheel (FL or FR or RL or RR) not Valid

C167500 — Signal Wheel (FL or FR or RL or RR) not Valid

Detailed page for trouble code C167500.

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Code

C167500

HYUNDAI C — Chassis

Signal Wheel (FL or FR or RL or RR) not Valid

Brand: HYUNDAI
Type: C — Chassis
AI status
Completed
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Completed 100%
Page language: EN

Causes

  • Faulty wheel speed (ABS) sensor (open, shorted, or internally failed)
  • Damaged, missing or heavily corroded tone ring/reluctor on hub/axle
  • Wiring harness damage (open, short to ground/power, chafing) or poor connector contact
  • Corrosion or water ingress at sensor connector
  • ABS/ESC control module fault or poor ground/supply to module
  • Magnetic debris build-up on sensor or tone ring

Symptoms

  • ABS and/or VDC/ESC warning lamp illuminated on dash
  • Traction control active or disabled unexpectedly
  • Speedometer or cruise control warnings or incorrect speed reading (in some models)
  • ABS braking behavior altered (pulsation, reduced ABS function)
  • Stored DTCs identifying a specific wheel speed circuit

What to check

  • Read stored codes and freeze frame data with a scan tool; note which wheel is flagged
  • Observe live wheel speed sensor data at rest and during slow movement; compare all four wheels
  • Visual inspection of sensor, tone ring, and wiring harness for damage, debris, or missing teeth
  • Check sensor connector for corrosion, bent pins, or water intrusion and reseat
  • Measure sensor resistance (if passive) and compare to spec; check continuity to ABS module
  • Spin hub and measure AC output with DVM (AC) or use oscilloscope for waveform

Signal parameters

  • Passive (magnetic) sensor: AC output varies with speed — small mV at very low speed up to several volts RMS at higher speed; waveform sinusoidal
  • Typical passive sensor DC resistance (approximate): ~800–2,500 ohms (manufacturer-specific — check service spec)
  • Active (Hall/PNP/NPN) sensor: square/pulse waveform, typically 0–5 V or 0–12 V depending on system; frequency proportional to wheel speed
  • Expected behavior: matching wheel-speed pulse frequency on the affected wheel relative to others; clean, consistent waveform with no dropouts
  • Use an oscilloscope for definitive waveform shape, amplitude, and missing pulse diagnosis

Diagnostic algorithm

  1. Connect a scan tool, confirm C167500 and note which wheel (FL/FR/RL/RR) is reported; record freeze frame/live data.
  2. Visually inspect the flagged wheel sensor, tone ring, and connector for damage, debris, corrosion, or missing teeth.
  3. With ignition off, disconnect sensor connector and inspect pins; clean and apply dielectric grease if corroded; reconnect and re-check code.
  4. Measure sensor resistance (for passive sensors) and compare to manufacturer spec. If out of range, replace sensor.
  5. Raise vehicle safely, spin the wheel by hand or run at low speed; measure AC voltage (passive) or pulse output (active) with DVM/oscilloscope. Look for consistent pulses proportional to wheel rotation.
  6. Wiggle the harness and connector while monitoring live data for intermittent signal loss. Check continuity from sensor connector to ABS module pin for opens/shorts.
  7. If signal is absent or erratic and sensor tests good, inspect tone ring for damaged/missing teeth or heavy rust/metal debris; repair or replace as needed.
  8. If uncertain, swap the suspect sensor with a known-good sensor from another wheel (if wiring connectors/pinout identical). If the code follows the sensor, replace the sensor.
  9. Verify ABS module power, ground, and communication lines; repair wiring or replace module only after excluding sensor and harness faults.
  10. Clear codes and perform a road test to confirm proper wheel speed signals and that the code does not return.

Likely causes

  • Sensor damaged or contaminated (most common)
  • Connector corrosion or wiring open/short at wheel
  • Damaged or missing teeth on tone ring
  • Broken/poor ground or power feed to ABS module (less common)

Fault status

⚠️ Status
C167500 — Wheel speed sensor signal invalid for specified wheel (FL/FR/RL/RR). Possible sensor, tone ring, wiring, connector, or module fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

C0035 C0040 C0045 C0050
371

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