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Home / DTC / C0320 — ABS wheel speed sensor circuit malfunction

C0320 — ABS wheel speed sensor circuit malfunction

Detailed page for trouble code C0320.

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C0320

Generic C — Chassis

ABS wheel speed sensor circuit malfunction

Brand: Generic
Type: C — Chassis
Views: UK: 3 EN: 3 RU: 2
AI status
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Page language: EN

Causes

  • Open or short in the wheel speed sensor wiring harness
  • Corroded, loose, or damaged sensor connector
  • Failed wheel speed sensor (Hall-effect or VR sensor)
  • Damaged or missing tone ring/reluctor (broken, contaminated, or magnetized)
  • Excessive wheel bearing play or debris affecting sensor gap
  • Poor ground or reference voltage feeding the sensor

Symptoms

  • ABS warning lamp illuminated on dash (may also light traction control/ESC lamp)
  • ABS and/or traction control systems may be disabled
  • Possible intermittent ABS activation or false ABS events
  • Speedometer usually unaffected (vehicle speed sensor is different), unless integrated systems share inputs
  • Unusual noise or roughness from wheel area if tone ring or bearing is damaged

What to check

  • Read live data with a scan tool: compare wheel speed readings while rotating each wheel — a faulty sensor often shows zero, erratic, or no signal for that wheel
  • Perform visual inspection of sensor, tone ring, and wiring for damage, contamination, rubbing, or missing teeth
  • Check connector pins for corrosion, bent pins, or poor mating; unplug/replug and inspect
  • Measure sensor resistance (ohms) and compare to manufacturer spec; look for open/short
  • Check sensor output with oscilloscope while wheel is rotated (preferred) or with multimeter for AC voltage on VR sensors or DC switching on Hall sensors
  • Back-probe reference voltage and ground at the sensor connector (Hall sensors often require ~5V reference)

Signal parameters

  • Variable-reluctance (VR) sensor: AC sine-like pulses; amplitude increases with wheel speed — typically from a few tens of mV at very low speed to ~0.05–2.5 VAC or higher depending on system and speed
  • VR sensor DC resistance (typical range): ~800–3000 ohms (manufacturer-specific)
  • Hall-effect sensor: digital square-wave output referenced to supply; typically 0–5 V (or 0.5–4.5 V) switching levels with ~5 V reference supply
  • Pulse frequency proportional to wheel speed and number of tone-ring teeth (frequency increases linearly with speed)
  • Expected behavior: clean, consistent pulses or square waves with no dropouts or irregular amplitude when wheel is rotated

Diagnostic algorithm

  1. Retrieve freeze frame and live data with scan tool; note which wheel shows fault and when it occurs.
  2. Visually inspect the suspect wheel sensor, connector, tone ring and wiring for obvious damage, contamination, or missing teeth.
  3. With the connector disconnected, measure sensor resistance; compare to spec. If open/short, replace sensor.
  4. Reconnect and back-probe the connector while spinning the wheel. For VR sensors measure AC output with scope/multimeter; for Hall sensors confirm reference voltage (≈5V) and switching output between ~0–5V.
  5. Wiggle the harness and connectors while monitoring live data or signal to detect intermittent faults.
  6. Check continuity between the sensor connector and the ABS module pins; repair any shorts/opens or damaged shielding/grounds.
  7. Inspect/repair tone ring: remove debris, correct alignment, or replace if teeth are damaged or missing.
  8. If sensor and wiring tests are good but the code persists, check ABS module input circuits and communication; consult manufacturer procedures for module testing.
  9. Clear codes and road-test to verify repair; confirm no reappearance of code and that ABS/ESC operate normally.

Likely causes

  • Damaged or contaminated wheel speed sensor
  • Open/short or intermittent wiring/conductor to sensor
  • Corroded/loose connector at the sensor or ABS module
  • Damaged or missing tone ring teeth or heavy rust/debris
  • Sensor air gap out of specification due to bearing/wheel issues

Fault status

⚠️ Status
ABS control module detected a wheel speed sensor circuit malfunction — possible open/short, missing or erratic sensor signal. ABS/traction control may be disabled for safety.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

Similar codes

C0035 C0040 C0045 C0050 P0500 U0121
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