C0037

Code

HYUNDAI C — Chassis

Left Rear Wheel Speed Sensor (Subfault)

Brand: HYUNDAI

Type: C — Chassis

Views: UK: 34 EN: 78 RU: 59

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Page language: EN

ABS and/or ESC/Traction Control warning lamp illuminated
Possible loss of ABS/ESC functionality or reduced braking stability under slip conditions
Traction control or stability interventions disabled or unavailable
Intermittent fault — warnings may appear only during cornering or over bumps
Erratic speed readout for the affected wheel in scan tool live data

Connect a scan tool and record freeze frame and live wheel speed data for all four wheels while rotating the wheel by hand or on a lift
Visually inspect left rear wheel sensor, connector, and wiring for damage, corrosion, or contamination
Inspect tone/reluctor ring and wheel bearing for damage, missing teeth, excessive rust or metal debris
Backprobe the sensor connector and check for proper reference power/ground (if active sensor) or sensor resistance (if passive) per manufacturer specs
Check for continuity between sensor connector and ABS module connector and check for shorts to ground or power
Wiggle the harness while monitoring live data to reproduce an intermittent fault

Passive (magnetic) sensor: generates AC pulses whose frequency and amplitude increase with wheel speed; expected AC waveform visible on scope
Active (Hall/active) sensor: provides a square/sinusoidal pulse or 0–5 V digital signal; frequency proportional to wheel speed
Sensor DC resistance and reference voltage vary by model — verify exact resistance and supply voltage from Hyundai service manual
Expected behavior: all four wheel speed sensors produce consistent frequency/voltage proportional to wheel speed; the affected sensor will show no pulses, low amplitude, erratic waveform, or open/short reading

Read and record all ABS/ESC codes with a compatible scan tool; note freeze frame data
Visually inspect sensor, connector and tone ring; clean magnetic debris and correct any physical damage
Check connector pins for corrosion, bent pins, or water intrusion; repair or replace connector as needed
Measure sensor resistance (if passive) and compare to service manual; if out of range, replace sensor
Backprobe harness at connector and monitor signal while spinning the wheel (multimeter or scope). For active sensors verify reference power and ground, and that the sensor produces pulses when wheel turns
Perform continuity test from sensor connector to ABS module to locate opens/shorts; repair wiring faults and protect with loom/seal the connector
If wiring and sensor test good but fault persists, inspect wheel bearing/tone ring alignment; replace damaged tone ring or bearing as required
After repairs, clear codes, perform road or lift test while monitoring live wheel speed data to ensure fault does not return

Corroded/loose connector at left rear wheel sensor
Physical damage to the left rear sensor or wiring from road debris
Contaminated or damaged tone/reluctor ring (missing teeth, heavy rust/metal debris)
Intermittent wiring short to ground or open in harness at wheel arch
Failed wheel speed sensor (internal open/short)

⚠️ Status

C0037 — Left Rear Wheel Speed Sensor circuit subfault detected. ABS/ESC may be limited or disabled until fault is repaired.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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C0037 — Left Rear Wheel Speed Sensor (Subfault)