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Home / DTC / C2340 — ABS rear right wheel speed sensor circuit

C2340 — ABS rear right wheel speed sensor circuit

Detailed page for trouble code C2340.

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C2340

Generic C — Chassis

ABS rear right wheel speed sensor circuit

Brand: Generic
Type: C — Chassis
Views: UK: 2 EN: 2 RU: 1
AI status
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Page language: EN

Causes

  • Open or shorted wiring between the rear right wheel speed sensor and ABS module
  • Corroded, loose, or damaged connector at the sensor or ABS module
  • Failed wheel speed sensor (passive or active type)
  • Damaged or missing tone/reluctor ring teeth or excessive air gap
  • Faulty ABS control module or poor module ground
  • Intermittent mechanical damage (wheel bearing, hub) affecting sensor alignment

Symptoms

  • ABS warning lamp illuminated
  • Traction control or stability control warning lamp may also be on
  • ABS or traction control intervention may be disabled
  • Possible locked ABS activation during braking tests
  • Speedometer unaffected on many vehicles, but wheel speed reading may be missing or erratic on a scan tool

What to check

  • Read ABS codes and freeze frame with a scan tool; note any related codes
  • Visually inspect rear right sensor, connector, wiring harness, and tone ring
  • Check for physical damage, contamination, or missing reluctor teeth
  • Backprobe connector and check for proper reference voltage/ground where applicable
  • Compare live wheel speed sensor data on a scan tool while rotating the wheel
  • Measure sensor resistance and continuity; check for short to ground or battery

Signal parameters

  • Passive (magnetic) sensor: AC sine output; amplitude typically 0.1–1.5 Vrms at low speeds and rising with speed; frequency proportional to wheel speed (tens to kHz depending on speed)
  • Active (Hall/VR with internal electronics) sensor: digital square wave, typically 0–5 V (or 0–12 V on some systems); frequency proportional to wheel speed
  • Typical passive sensor DC resistance commonly in the hundreds to a few thousand ohms (often ~800–2000 Ω, manufacturer-specific)
  • Expected scan tool wheel speed: increases smoothly with wheel rotation and matches other wheels at same speed; sudden drop to zero or erratic values indicate fault

Diagnostic algorithm

  1. Retrieve ABS codes and live data with a scan tool; note if only rear right channel is affected or multiple channels.
  2. Visually inspect rear right wheel sensor, connector, wiring, and tone ring for damage, debris, or missing teeth. Repair obvious mechanical issues.
  3. With ignition ON (engine off), backprobe the sensor connector. For active sensors check supply voltage (reference) and ground. For passive sensors measure resistance across sensor terminals.
  4. If active sensor has no reference voltage or ground, trace wiring back to ABS module; repair open/corroded circuits or poor grounds.
  5. If sensor has proper power/ground but no output, spin the wheel and observe the sensor signal with an oscilloscope or scan tool: expect a clean square wave (active) or AC waveform (passive).
  6. If the signal is absent or erratic, disconnect sensor and check for short to battery or ground using an ohmmeter. Repair wiring faults if present.
  7. If wiring and connectors test good but signal is bad, replace the wheel speed sensor and road test.
  8. If replacement sensor does not restore signal, inspect tone ring/reluctor for damage and ensure correct air gap; repair or replace as needed.
  9. If wiring, sensor, and tone ring are good, investigate ABS module input and grounds; check for internal module faults and reprogram or replace module only after confirming upstream components.
  10. Clear codes and perform a verification drive; re-scan to confirm the issue is resolved.

Likely causes

  • Broken or chafed sensor wiring harness near the wheel or suspension
  • Corroded sensor connector allowing intermittent contact
  • Contaminated or physically damaged sensor (metal debris, brake dust)
  • Worn or damaged tone ring (cracked, missing teeth, rust build-up)
  • Failed sensor due to water ingress or internal short
  • Poor ground at ABS module or battery ground strap

Fault status

⚠️ Status
ABS rear right wheel speed sensor circuit fault — signal missing, intermittent, or out of range. Check sensor, wiring, tone ring, and module grounds.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

C0035 C0040 C0045 C0050 C1234
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