C0372

Code

Generic C — Chassis

Right Rear Wheel Speed Sensor Circuit Intermittent

Brand: Generic

Type: C — Chassis

Views: UK: 6 EN: 11 RU: 10

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Damaged or failed RR wheel speed sensor
Broken, chafed or pinched wiring in the RR sensor harness
Corroded, dirty or loose connector/pin at the sensor or ABS module
Damaged or missing tone ring (reluctor) or magnetic debris on tone ring
Wheel bearing or hub damage causing sensor-to-reluctor air gap variation
Intermittent short to ground/voltage or open circuit in harness

Symptoms

ABS, TCS or ESC warning light illuminated intermittently or continuously
Intermittent loss of ABS operation or unexpected ABS activations
Traction control behaving erratically (unwanted intervention or disabled)
Speedometer usually unaffected on some vehicles; may show inconsistencies on others
Code returns after driving or when wheel is moved/wiggled

What to check

Scan for stored/freeze-frame data and view live wheel speed sensor readings while spinning each wheel
Visual inspection of RR sensor, tone ring, hub, wiring loom, and connectors for damage or corrosion
Wiggle test: move harness and connector while viewing live data to reproduce the intermittent
Backprobe sensor connector: check reference voltage and signal ground for active sensors
Measure sensor resistance (for passive sensors) and compare to specification
Measure AC voltage or use oscilloscope on signal wire while spinning wheel to check for consistent waveform

Signal parameters

Passive (variable reluctance) sensor: DC resistance typically ~500–2000 Ω (varies by vehicle); generates AC voltage that increases with wheel speed (sinewave/AC) — expect measurable AC at low speed and increasing amplitude with RPM
Active (Hall/effect) sensor: typically has a 5 V reference and ground; signal is a square/pulse waveform 0–5 V (or ~0.5–4.5 V) with frequency proportional to wheel speed
Typical waveform: clean, regular pulses with amplitude and frequency increasing smoothly as wheel speed increases; intermittent faults show dropouts, missing pulses or noisy/distorted waveform
Expected behavior: no sudden signal loss when wheel spins; similar amplitude and frequency compared with other wheels at same speed (proportionally)

Diagnostic algorithm

Read and record trouble code(s) and freeze frame data. Note conditions when fault set (speed, temp, steering).
With scan tool, observe live wheel speed sensor data while rotating vehicle or spinning the RR wheel on a lift. Look for dropouts or irregular pulses.
Visually inspect the RR sensor, tone ring, hub and wiring for physical damage, debris, rust, or missing tone ring teeth. Check sensor air gap and mounting.
Wiggle the RR harness, connector and sensor while watching live data to try to reproduce the intermittent. If intermittent appears with movement, focus on harness/connector.
Backprobe the sensor connector: for active sensors confirm reference voltage (normally ~5 V) and ground; for passive sensors measure DC resistance with the connector disconnected and compare to spec.
Spin the wheel and measure the signal with a multimeter (AC) or oscilloscope on the signal wire. Verify waveform is consistent and free of noise or dropouts.
If sensor resistance is out of range, signal is missing or waveform is noisy, replace the RR sensor. If signal is good at the sensor but intermittent at the module, inspect/repair wiring between sensor and ABS module.
If harness or connector pins are corroded/damaged, repair or replace the connector and/or wiring. Secure harness away from pinch points and recheck.
If the tone ring is damaged, replace the ring/hub assembly as required and recheck waveform/clear codes.
After repair, clear codes and perform a road test or lift test to confirm the fault does not return and ABS/ESC behave normally.

Likely causes

Connector corrosion or loose connection at the RR sensor
Wire damage in harness near wheel or suspension (pinch/wear)
Sensor damaged by debris or knocked out of position
Tone ring damaged, cracked, missing teeth or heavy rust buildup
Intermittent internal sensor failure

Fault status

⚠️ Status

Right rear wheel speed sensor circuit intermittent — the ABS/traction control module detected intermittent or missing signal from the right rear wheel speed sensor. This may disable ABS/TCS/ESC functions until the underlying wiring, connector, sensor or tone ring issue is repaired.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours