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Home / DTC / C0325 — Wheel Speed Sensor Circuit — Rear Right

C0325 — Wheel Speed Sensor Circuit — Rear Right

Detailed page for trouble code C0325.

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C0325

Generic C — Chassis

Wheel Speed Sensor Circuit — Rear Right

Brand: Generic
Type: C — Chassis
Views: UK: 10 EN: 15 RU: 8
AI status
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Page language: EN

Causes

  • Faulty rear right wheel speed sensor (open, shorted, internal failure)
  • Damaged, corroded or disconnected sensor connector or wiring harness
  • Damaged or missing tone/reluctor ring (broken teeth, heavy contamination)
  • Sensor air gap out of specification (misalignment)
  • Short to battery or ground in sensor circuit
  • Intermittent connection due to chafed wiring or damaged insulation

Symptoms

  • ABS warning lamp illuminated (may also show traction/stability lamp)
  • Loss or reduced function of ABS/traction/stability systems
  • ABS/ESC interventions may be disabled or behave unpredictably
  • One wheel speed reading different or zero on scan tool/live data
  • Brake or stability control pulses or wheel lockup under heavy braking (in some cases)
  • Possible diagnostic trouble codes for other wheel sensors if system compensates

What to check

  • Read DTC(s) and freeze frame/fault data with a scan tool; note any related codes
  • Visually inspect rear right wheel area: sensor, connector, wiring, and tone ring
  • Backprobe the sensor connector with ignition ON and while spinning wheel to observe live data
  • Compare rear right wheel speed data to opposite wheel while driving slowly or using a jack
  • Measure sensor resistance (for passive sensors) and compare to manufacturer spec
  • Measure sensor signal while spinning wheel: AC voltage for passive sensors, digital/pulse for active sensors

Signal parameters

  • Passive (variable reluctance) sensors: DC resistance typically in the hundreds to low thousands of ohms (vehicle-specific); generate AC voltage that increases with wheel speed (low mV at very low speed to several hundred mV–volts at higher speed)
  • Active (Hall/iented) sensors: require reference voltage (commonly ~5 V); output is a pulsed/square waveform (0–5 V or 0–12 V depending on system) with frequency proportional to wheel speed
  • Expected behavior: clean, continuous waveform or steady frequency increase with wheel rotation; intermittent, zero or erratic signals indicate a problem
  • No signal or constant voltage (no switching) suggests open/failed sensor, lost reference, or short

Diagnostic algorithm

  1. Confirm code(s) and note freeze frame using a scan tool. Do not replace parts without confirming tests.
  2. Perform a visual inspection of the rear right sensor, connector and harness for damage, contamination or corrosion. Repair visible damage.
  3. Backprobe the sensor connector: with ignition ON, check for proper reference voltage (if active sensor) and ground presence per vehicle spec.
  4. Spin the wheel (vehicle raised and supported on jack stands or safe lift) and observe live wheel speed data on the scan tool. Compare to the opposite wheel.
  5. Measure sensor resistance (if passive) and/or measure AC output while spinning the wheel. For active sensors, monitor the pulsed output. Intermittent or no output indicates sensor or tone ring issue.
  6. Check continuity of the wiring from the sensor connector to the ABS module and test for shorts to ground or battery. Wiggle the harness to reproduce intermittent faults.
  7. Inspect the tone/reluctor ring for missing teeth, heavy rust, metal debris or misalignment; clean or replace as required.
  8. If wiring, connector repairs or sensor replacement are performed, clear codes and road test to verify repair. Re-scan to confirm no recurrence.
  9. If tests indicate proper sensor and wiring operation but code persists, consider ABS module diagnosis by a qualified technician or dealer-level diagnostics.

Likely causes

  • Contaminated, disconnected or corroded connector at the rear right sensor
  • Open or shorted wiring between sensor and ABS module (wire chafe or pinched)
  • Failed rear right wheel speed sensor
  • Damaged or misaligned tone/reluctor ring at rear right wheel

Fault status

⚠️ Status
Wheel speed sensor circuit fault detected — Rear Right. Possible open/short/intermittent signal; ABS/traction control may be disabled or limited.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

Similar codes

C0035 C0040 C0045 C0050 C0121
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