Code
C0373
Generic
C — Chassis
Right Rear Wheel Speed Sensor Circuit - No Signal
Views:
UK: 3
EN: 10
RU: 8
AI status
Completed
Completed
100%
Causes
- Open or short in the right rear wheel speed sensor wiring
- Faulty right rear wheel speed sensor
- Corroded or loose sensor connector
- Damaged or dirty tone ring (reluctor) or missing teeth
- ABS/traction control module or wiring connector fault
- Interference from nearby metal debris or aftermarket parts
Symptoms
- ABS warning light and/or traction/stability control warning lamp illuminated
- ABS/traction control inoperative or disabled on one corner
- Brake pedal feel may change during hard ABS events
- Traction control may not engage or may operate erratically
- Possible speedometer fluctuation if system uses wheel sensors for vehicle speed
What to check
- Read and record freeze-frame and live data from ABS module with a scanner
- Compare right rear wheel speed reading to other wheels at low speed
- Visually inspect sensor, connector, and tone ring for damage or debris
- Check for corrosion, bent pins, or water intrusion at the connector
- Measure sensor resistance and signal with multimeter/oscilloscope
- Verify reference power and ground to the sensor (if active type)
Signal parameters
- Passive (VR) sensor: AC waveform whose amplitude and frequency increase with wheel speed; low-speed AC amplitude typically > ~0.1 V and rises with speed (varies by vehicle)
- Active (Hall/IGBT) sensor: digital square wave or pulsed 0–Vref (commonly 5 V, some 12 V or regulated 3.3 V systems); transitions on wheel rotation
- Typical sensor resistance (varies by manufacturer): commonly in the hundreds to low thousands of ohms (example ranges 500–2500 Ω) for VR types — consult vehicle data
- Pulse frequency proportional to wheel speed; many systems generate multiple pulses per wheel revolution depending on tone ring tooth count
- Expected idle/low-speed digital transitions: clear, repeatable edges; no constant 0 V or stuck high
Diagnostic algorithm
- Scan ABS module, read C0373 and any related codes; save live data.
- Road or lift test at low speed while monitoring all wheel speeds; confirm right rear shows no pulses or is inconsistent.
- Visually inspect right rear sensor and tone ring for contamination, damage or missing teeth; clean if needed.
- Unplug the sensor connector, inspect pins for corrosion or damage; reconnect and test for improved signal.
- With connector disconnected, measure sensor resistance (for passive) or supply/ground (for active) against vehicle specifications.
- Backprobe connector with oscilloscope while spinning hub/wheel to observe waveform; verify expected AC or digital pulses.
- If no signal at sensor but correct supply/ground, replace sensor and retest.
- If sensor OK but no signal at module, check wiring continuity and for shorts to power/ground between sensor and module; repair wiring as needed.
- Check ABS module power and ground circuits; repair poor grounds or blown fuses.
- After repairs, clear codes and perform a road test to confirm the code does not return and ABS/TC functions are restored.
Likely causes
- Sensor wiring pin pushed out, corroded, or water-intruded connector
- Sensor damaged by road debris or wheel servicing
- Broken tone ring tooth(s) or heavy rust on tone ring
- Short to power/ground at a wiring harness chafe point near suspension
- Failed wheel speed sensor (Hall-effect or VR) due to age or heat
- Module input circuit fault or poor module ground
Fault status
Status
Right rear wheel speed sensor circuit - no signal. ABS/traction control may be disabled for right rear wheel until fault is corrected.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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