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Home / DTC / C0037 — Left rear wheel speed sensor

C0037 — Left rear wheel speed sensor

Detailed page for trouble code C0037.

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C0037

ALFA ROMEO C — Chassis

Left rear wheel speed sensor

Brand: ALFA ROMEO
Type: C — Chassis
Views: UK: 3 EN: 22 RU: 15
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed or damaged left rear wheel speed sensor
  • Open or shorted wiring between sensor and ABS module
  • Corroded or loose connector at sensor or harness
  • Damaged or missing tone (reluctor) ring on hub/axle
  • Excessive air gap or misalignment between sensor and tone ring
  • Contamination (metallic debris, grease) on sensor/reluctor

Symptoms

  • ABS warning lamp illuminated
  • Traction control/stability control faults or disabled
  • ABS braking performance degraded or altered
  • Inconsistent or missing wheel speed reading for left rear in scan tool
  • Brake/ABS pulsation or unusual noises from rear wheel
  • Possible speedometer/odometer anomalies (less common)

What to check

  • Scan ABS module for current/frozen DTCs and freeze frame data
  • Visual inspection of left rear sensor, connector, and wiring for damage or corrosion
  • Check for loose or missing tone/reluctor ring teeth and inspect wheel bearing
  • Backprobe connector and measure sensor resistance (if applicable) and supply voltage
  • Monitor wheel speed sensor channel with scan tool while rotating wheel (or on road test)
  • If available, view sensor waveform with oscilloscope while wheel is rotated

Signal parameters

  • Type: either passive (VR) or active (hall/magnetoresistive) depending on vehicle/version
  • Passive (VR): DC resistance typically ~500–2,000 Ω (manufacturer-specific); produces AC voltage increasing with wheel speed (tens to hundreds of mV to volts depending on speed)
  • Active (hall/variable): square or pulse waveform, 0–5 V (or 0–12 V) switching; frequency proportional to wheel speed
  • Expected behaviour: clean, regular pulses/waveform with amplitude/frequency increasing with wheel rotation speed
  • Abnormal: zero output, flatline, noisy or intermittent waveform, or constant voltage

Diagnostic algorithm

  1. Retrieve all stored codes and freeze-frame data using a compatible scan tool.
  2. Perform visual inspection of left rear sensor, harness, and connector for damage, contamination or corrosion; repair obvious damage.
  3. With ignition ON, backprobe connector: verify reference power/ground (if active sensor) or measure sensor resistance (if passive). Compare to OEM spec.
  4. Rotate wheel by hand or lift vehicle and road test while monitoring live wheel speed data; note if left rear reading is missing or erratic.
  5. Use a scope or multimeter (AC volts for VR sensor) to view waveform while wheel is rotated; look for clean periodic signal.
  6. Wiggle test wiring and connectors while monitoring data to identify intermittent opens/shorts.
  7. Inspect tone ring and wheel bearing for damage, missing teeth, or excessive play; correct as required.
  8. If wiring and tone ring are good, swap left rear sensor with another known-good sensor (if practical) to confirm sensor vs harness/module fault.
  9. Check ABS module power and ground circuits if signal and wiring appear good.
  10. After repair or replacement, clear codes and perform road test to verify the fault does not return.

Likely causes

  • Wiring/connector fault at left rear sensor (most common)
  • Failed left rear sensor element
  • Damaged or dirty tone/reluctor ring at left rear wheel
  • Incorrect sensor gap or misalignment

Fault status

⚠️ Status
ABS/ESC control module has logged a fault for the left rear wheel speed sensor circuit; ABS warning lamp may be lit. Fault can be stored as current or intermittent — diagnostic data (freeze frame and live data) should be checked before repair.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

C0035 C0036 C0040 P0500 C0047
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Code

C0037

FIAT C — Chassis

Left rear wheel speed sensor

Brand: FIAT
Type: C — Chassis
Views: UK: 3 EN: 21 RU: 15
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed or damaged left rear wheel speed sensor
  • Open or shorted wiring between sensor and ABS module
  • Corroded or loose connector at sensor or harness
  • Damaged or missing tone (reluctor) ring on hub/axle
  • Excessive air gap or misalignment between sensor and tone ring
  • Contamination (metallic debris, grease) on sensor/reluctor

Symptoms

  • ABS warning lamp illuminated
  • Traction control/stability control faults or disabled
  • ABS braking performance degraded or altered
  • Inconsistent or missing wheel speed reading for left rear in scan tool
  • Brake/ABS pulsation or unusual noises from rear wheel
  • Possible speedometer/odometer anomalies (less common)

What to check

  • Scan ABS module for current/frozen DTCs and freeze frame data
  • Visual inspection of left rear sensor, connector, and wiring for damage or corrosion
  • Check for loose or missing tone/reluctor ring teeth and inspect wheel bearing
  • Backprobe connector and measure sensor resistance (if applicable) and supply voltage
  • Monitor wheel speed sensor channel with scan tool while rotating wheel (or on road test)
  • If available, view sensor waveform with oscilloscope while wheel is rotated

Signal parameters

  • Type: either passive (VR) or active (hall/magnetoresistive) depending on vehicle/version
  • Passive (VR): DC resistance typically ~500–2,000 Ω (manufacturer-specific); produces AC voltage increasing with wheel speed (tens to hundreds of mV to volts depending on speed)
  • Active (hall/variable): square or pulse waveform, 0–5 V (or 0–12 V) switching; frequency proportional to wheel speed
  • Expected behaviour: clean, regular pulses/waveform with amplitude/frequency increasing with wheel rotation speed
  • Abnormal: zero output, flatline, noisy or intermittent waveform, or constant voltage

Diagnostic algorithm

  1. Retrieve all stored codes and freeze-frame data using a compatible scan tool.
  2. Perform visual inspection of left rear sensor, harness, and connector for damage, contamination or corrosion; repair obvious damage.
  3. With ignition ON, backprobe connector: verify reference power/ground (if active sensor) or measure sensor resistance (if passive). Compare to OEM spec.
  4. Rotate wheel by hand or lift vehicle and road test while monitoring live wheel speed data; note if left rear reading is missing or erratic.
  5. Use a scope or multimeter (AC volts for VR sensor) to view waveform while wheel is rotated; look for clean periodic signal.
  6. Wiggle test wiring and connectors while monitoring data to identify intermittent opens/shorts.
  7. Inspect tone ring and wheel bearing for damage, missing teeth, or excessive play; correct as required.
  8. If wiring and tone ring are good, swap left rear sensor with another known-good sensor (if practical) to confirm sensor vs harness/module fault.
  9. Check ABS module power and ground circuits if signal and wiring appear good.
  10. After repair or replacement, clear codes and perform road test to verify the fault does not return.

Likely causes

  • Wiring/connector fault at left rear sensor (most common)
  • Failed left rear sensor element
  • Damaged or dirty tone/reluctor ring at left rear wheel
  • Incorrect sensor gap or misalignment

Fault status

⚠️ Status
ABS/ESC control module has logged a fault for the left rear wheel speed sensor circuit; ABS warning lamp may be lit. Fault can be stored as current or intermittent — diagnostic data (freeze frame and live data) should be checked before repair.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

C0035 C0036 C0040 P0500 C0047
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Code

C0037

Generic C — Chassis

Left Rear Wheel Speed Sensor

Brand: Generic
Type: C — Chassis
Views: UK: 41 EN: 49 RU: 78
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed or damaged left rear wheel speed sensor
  • Open or shorted wiring between sensor and ABS module
  • Corroded or loose connector at sensor or harness
  • Damaged or missing tone (reluctor) ring on hub/axle
  • Excessive air gap or misalignment between sensor and tone ring
  • Contamination (metallic debris, grease) on sensor/reluctor

Symptoms

  • ABS warning lamp illuminated
  • Traction control/stability control faults or disabled
  • ABS braking performance degraded or altered
  • Inconsistent or missing wheel speed reading for left rear in scan tool
  • Brake/ABS pulsation or unusual noises from rear wheel
  • Possible speedometer/odometer anomalies (less common)

What to check

  • Scan ABS module for current/frozen DTCs and freeze frame data
  • Visual inspection of left rear sensor, connector, and wiring for damage or corrosion
  • Check for loose or missing tone/reluctor ring teeth and inspect wheel bearing
  • Backprobe connector and measure sensor resistance (if applicable) and supply voltage
  • Monitor wheel speed sensor channel with scan tool while rotating wheel (or on road test)
  • If available, view sensor waveform with oscilloscope while wheel is rotated

Signal parameters

  • Type: either passive (VR) or active (hall/magnetoresistive) depending on vehicle/version
  • Passive (VR): DC resistance typically ~500–2,000 Ω (manufacturer-specific); produces AC voltage increasing with wheel speed (tens to hundreds of mV to volts depending on speed)
  • Active (hall/variable): square or pulse waveform, 0–5 V (or 0–12 V) switching; frequency proportional to wheel speed
  • Expected behaviour: clean, regular pulses/waveform with amplitude/frequency increasing with wheel rotation speed
  • Abnormal: zero output, flatline, noisy or intermittent waveform, or constant voltage

Diagnostic algorithm

  1. Retrieve all stored codes and freeze-frame data using a compatible scan tool.
  2. Perform visual inspection of left rear sensor, harness, and connector for damage, contamination or corrosion; repair obvious damage.
  3. With ignition ON, backprobe connector: verify reference power/ground (if active sensor) or measure sensor resistance (if passive). Compare to OEM spec.
  4. Rotate wheel by hand or lift vehicle and road test while monitoring live wheel speed data; note if left rear reading is missing or erratic.
  5. Use a scope or multimeter (AC volts for VR sensor) to view waveform while wheel is rotated; look for clean periodic signal.
  6. Wiggle test wiring and connectors while monitoring data to identify intermittent opens/shorts.
  7. Inspect tone ring and wheel bearing for damage, missing teeth, or excessive play; correct as required.
  8. If wiring and tone ring are good, swap left rear sensor with another known-good sensor (if practical) to confirm sensor vs harness/module fault.
  9. Check ABS module power and ground circuits if signal and wiring appear good.
  10. After repair or replacement, clear codes and perform road test to verify the fault does not return.

Likely causes

  • Wiring/connector fault at left rear sensor (most common)
  • Failed left rear sensor element
  • Damaged or dirty tone/reluctor ring at left rear wheel
  • Incorrect sensor gap or misalignment

Fault status

⚠️ Status
ABS/ESC control module has logged a fault for the left rear wheel speed sensor circuit; ABS warning lamp may be lit. Fault can be stored as current or intermittent — diagnostic data (freeze frame and live data) should be checked before repair.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

C0035 C0036 C0040 P0500 C0047
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Code

C0037

HYUNDAI C — Chassis

Left Rear Wheel Speed Sensor (Subfault)

Brand: HYUNDAI
Type: C — Chassis
Views: UK: 29 EN: 46 RU: 49
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed or damaged left rear wheel speed sensor
  • Open or shorted wiring between sensor and ABS module
  • Corroded or loose connector at sensor or harness
  • Damaged or missing tone (reluctor) ring on hub/axle
  • Excessive air gap or misalignment between sensor and tone ring
  • Contamination (metallic debris, grease) on sensor/reluctor

Symptoms

  • ABS warning lamp illuminated
  • Traction control/stability control faults or disabled
  • ABS braking performance degraded or altered
  • Inconsistent or missing wheel speed reading for left rear in scan tool
  • Brake/ABS pulsation or unusual noises from rear wheel
  • Possible speedometer/odometer anomalies (less common)

What to check

  • Scan ABS module for current/frozen DTCs and freeze frame data
  • Visual inspection of left rear sensor, connector, and wiring for damage or corrosion
  • Check for loose or missing tone/reluctor ring teeth and inspect wheel bearing
  • Backprobe connector and measure sensor resistance (if applicable) and supply voltage
  • Monitor wheel speed sensor channel with scan tool while rotating wheel (or on road test)
  • If available, view sensor waveform with oscilloscope while wheel is rotated

Signal parameters

  • Type: either passive (VR) or active (hall/magnetoresistive) depending on vehicle/version
  • Passive (VR): DC resistance typically ~500–2,000 Ω (manufacturer-specific); produces AC voltage increasing with wheel speed (tens to hundreds of mV to volts depending on speed)
  • Active (hall/variable): square or pulse waveform, 0–5 V (or 0–12 V) switching; frequency proportional to wheel speed
  • Expected behaviour: clean, regular pulses/waveform with amplitude/frequency increasing with wheel rotation speed
  • Abnormal: zero output, flatline, noisy or intermittent waveform, or constant voltage

Diagnostic algorithm

  1. Retrieve all stored codes and freeze-frame data using a compatible scan tool.
  2. Perform visual inspection of left rear sensor, harness, and connector for damage, contamination or corrosion; repair obvious damage.
  3. With ignition ON, backprobe connector: verify reference power/ground (if active sensor) or measure sensor resistance (if passive). Compare to OEM spec.
  4. Rotate wheel by hand or lift vehicle and road test while monitoring live wheel speed data; note if left rear reading is missing or erratic.
  5. Use a scope or multimeter (AC volts for VR sensor) to view waveform while wheel is rotated; look for clean periodic signal.
  6. Wiggle test wiring and connectors while monitoring data to identify intermittent opens/shorts.
  7. Inspect tone ring and wheel bearing for damage, missing teeth, or excessive play; correct as required.
  8. If wiring and tone ring are good, swap left rear sensor with another known-good sensor (if practical) to confirm sensor vs harness/module fault.
  9. Check ABS module power and ground circuits if signal and wiring appear good.
  10. After repair or replacement, clear codes and perform road test to verify the fault does not return.

Likely causes

  • Wiring/connector fault at left rear sensor (most common)
  • Failed left rear sensor element
  • Damaged or dirty tone/reluctor ring at left rear wheel
  • Incorrect sensor gap or misalignment

Fault status

⚠️ Status
ABS/ESC control module has logged a fault for the left rear wheel speed sensor circuit; ABS warning lamp may be lit. Fault can be stored as current or intermittent — diagnostic data (freeze frame and live data) should be checked before repair.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

C0035 C0036 C0040 P0500 C0047
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Code

C0037

LAND ROVER C — Chassis

left rear wheel speed sensor

Brand: LAND ROVER
Type: C — Chassis
Views: UK: 8 EN: 32 RU: 34
AI status
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Page language: EN

Causes

  • Failed or damaged left rear wheel speed sensor
  • Open or shorted wiring between sensor and ABS module
  • Corroded or loose connector at sensor or harness
  • Damaged or missing tone (reluctor) ring on hub/axle
  • Excessive air gap or misalignment between sensor and tone ring
  • Contamination (metallic debris, grease) on sensor/reluctor

Symptoms

  • ABS warning lamp illuminated
  • Traction control/stability control faults or disabled
  • ABS braking performance degraded or altered
  • Inconsistent or missing wheel speed reading for left rear in scan tool
  • Brake/ABS pulsation or unusual noises from rear wheel
  • Possible speedometer/odometer anomalies (less common)

What to check

  • Scan ABS module for current/frozen DTCs and freeze frame data
  • Visual inspection of left rear sensor, connector, and wiring for damage or corrosion
  • Check for loose or missing tone/reluctor ring teeth and inspect wheel bearing
  • Backprobe connector and measure sensor resistance (if applicable) and supply voltage
  • Monitor wheel speed sensor channel with scan tool while rotating wheel (or on road test)
  • If available, view sensor waveform with oscilloscope while wheel is rotated

Signal parameters

  • Type: either passive (VR) or active (hall/magnetoresistive) depending on vehicle/version
  • Passive (VR): DC resistance typically ~500–2,000 Ω (manufacturer-specific); produces AC voltage increasing with wheel speed (tens to hundreds of mV to volts depending on speed)
  • Active (hall/variable): square or pulse waveform, 0–5 V (or 0–12 V) switching; frequency proportional to wheel speed
  • Expected behaviour: clean, regular pulses/waveform with amplitude/frequency increasing with wheel rotation speed
  • Abnormal: zero output, flatline, noisy or intermittent waveform, or constant voltage

Diagnostic algorithm

  1. Retrieve all stored codes and freeze-frame data using a compatible scan tool.
  2. Perform visual inspection of left rear sensor, harness, and connector for damage, contamination or corrosion; repair obvious damage.
  3. With ignition ON, backprobe connector: verify reference power/ground (if active sensor) or measure sensor resistance (if passive). Compare to OEM spec.
  4. Rotate wheel by hand or lift vehicle and road test while monitoring live wheel speed data; note if left rear reading is missing or erratic.
  5. Use a scope or multimeter (AC volts for VR sensor) to view waveform while wheel is rotated; look for clean periodic signal.
  6. Wiggle test wiring and connectors while monitoring data to identify intermittent opens/shorts.
  7. Inspect tone ring and wheel bearing for damage, missing teeth, or excessive play; correct as required.
  8. If wiring and tone ring are good, swap left rear sensor with another known-good sensor (if practical) to confirm sensor vs harness/module fault.
  9. Check ABS module power and ground circuits if signal and wiring appear good.
  10. After repair or replacement, clear codes and perform road test to verify the fault does not return.

Likely causes

  • Wiring/connector fault at left rear sensor (most common)
  • Failed left rear sensor element
  • Damaged or dirty tone/reluctor ring at left rear wheel
  • Incorrect sensor gap or misalignment

Fault status

⚠️ Status
ABS/ESC control module has logged a fault for the left rear wheel speed sensor circuit; ABS warning lamp may be lit. Fault can be stored as current or intermittent — diagnostic data (freeze frame and live data) should be checked before repair.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

C0035 C0036 C0040 P0500 C0047
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