Code
C1385
Generic
C — Chassis
Wheel Speed Sensor Circuit Fault
Views:
UK: 5
EN: 6
RU: 6
AI status
Completed
Completed
100%
Causes
- Damaged or contaminated wheel speed sensor
- Broken/frayed wiring, chafed insulation or damaged connector
- Corroded or loose connector pins or poor ground
- Missing, damaged or heavily corroded tone ring/reluctor
- Sensor air gap out of specification or magnetized sensor degraded
- Intermittent short to battery or ground, or high circuit resistance
Symptoms
- ABS warning lamp illuminated
- Traction control/ESC warning light may be on or system disabled
- Erratic or non-functioning speedometer (on some vehicles)
- Uncommanded ABS activation, pulsing brakes, or reduced braking performance
- Intermittent faults that clear when moving or after driving through water
- Stored freeze frame or live data showing missing/low frequency sensor signal
What to check
- Read ABS/BCM/TCU trouble codes and freeze frame with a capable scan tool
- Inspect sensor, connector and wiring harness at the affected wheel for damage, corrosion or looseness
- Visually inspect tone ring/reluctor for missing or damaged teeth, rust, or debris
- Backprobe connector with ignition ON and wiggle harness to check for intermittent faults
- Measure sensor resistance and compare to manufacturer spec
- Check sensor output while wheel is rotated (oscilloscope or multimeter AC measurement for passive sensors; DC or waveform for active sensors)
Signal parameters
- Passive (variable reluctance) sensors: DC resistance typically ~500–2000 Ω (manufacturer dependent); generate AC voltage pulses whose amplitude increases with wheel speed (examples: ~0.1–2.0 Vrms at low speeds).
- Active (Hall/VR with amplifier) sensors: require reference supply (commonly 5 V) and output a square or pulse waveform ~0–5 V (some systems use 0–12 V).
- Typical tone ring air gap: roughly 0.5–2.0 mm (vehicle-specific).
- Frequency: proportional to wheel speed — a few Hz at very low speeds up to several hundred Hz at highway speeds. Verify with vehicle service data for exact values.
Diagnostic algorithm
- Use a scan tool to capture the specific wheel(s) flagged and to view live wheel speed sensor data and freeze frame. Note whether the signal is absent, intermittent, low amplitude, or noisy.
- Visually inspect the sensor, connector, wiring along the harness to the ABS module and the tone ring for physical damage, contamination or missing teeth. Repair visible issues.
- With ignition ON (engine off), backprobe the sensor connector. For active sensors verify reference voltage (typically 5 V) and ground; for passive sensors measure DC resistance and compare to spec. Replace if out of range.
- Rotate the wheel (or lift vehicle safely on a hoist) and observe sensor output with an oscilloscope or a multimeter AC reading. Passive sensors should produce an AC waveform; active sensors should produce a switching waveform. Look for clean pulses without dropouts.
- Check continuity and insulation of wiring from sensor to ABS module; look for shorts to chassis ground or battery. Wiggle harness while monitoring to find intermittent faults.
- Verify tone ring condition and sensor air gap; correct spacing and repair/replace tone ring if teeth damaged or missing.
- If wiring and sensor test good but fault persists, verify ABS module inputs and grounds; consider resistance checks at module connector. If module input is confirmed open/short internally, module replacement or repair may be required.
- After repairs, clear codes, perform a road test and re-scan to confirm code does not return and that wheel speed readings are consistent across all wheels.
Likely causes
- Sensor wiring harness rubbed through at suspension or steering joint
- Connector contaminated with water/road salt causing high resistance or intermittent contact
- Physical damage to sensor during brake/axle service or wheel hub replacement
- Tone ring teeth chipped, missing, or contaminated with rust/debris causing no/irregular pulses
Fault status
Status
ABS/Traction control module reports a fault on a wheel speed sensor circuit (C1385). The circuit is indicating open, short, no signal or irregular signal. Inspect sensor, tone ring, wiring/connectors, and module inputs.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
C1385
HYUNDAI
C — Chassis
Vacuum Sensor-Electrical
Views:
UK: 15
EN: 21
RU: 23
AI status
Completed
Completed
100%
Causes
- Damaged or contaminated wheel speed sensor
- Broken/frayed wiring, chafed insulation or damaged connector
- Corroded or loose connector pins or poor ground
- Missing, damaged or heavily corroded tone ring/reluctor
- Sensor air gap out of specification or magnetized sensor degraded
- Intermittent short to battery or ground, or high circuit resistance
Symptoms
- ABS warning lamp illuminated
- Traction control/ESC warning light may be on or system disabled
- Erratic or non-functioning speedometer (on some vehicles)
- Uncommanded ABS activation, pulsing brakes, or reduced braking performance
- Intermittent faults that clear when moving or after driving through water
- Stored freeze frame or live data showing missing/low frequency sensor signal
What to check
- Read ABS/BCM/TCU trouble codes and freeze frame with a capable scan tool
- Inspect sensor, connector and wiring harness at the affected wheel for damage, corrosion or looseness
- Visually inspect tone ring/reluctor for missing or damaged teeth, rust, or debris
- Backprobe connector with ignition ON and wiggle harness to check for intermittent faults
- Measure sensor resistance and compare to manufacturer spec
- Check sensor output while wheel is rotated (oscilloscope or multimeter AC measurement for passive sensors; DC or waveform for active sensors)
Signal parameters
- Passive (variable reluctance) sensors: DC resistance typically ~500–2000 Ω (manufacturer dependent); generate AC voltage pulses whose amplitude increases with wheel speed (examples: ~0.1–2.0 Vrms at low speeds).
- Active (Hall/VR with amplifier) sensors: require reference supply (commonly 5 V) and output a square or pulse waveform ~0–5 V (some systems use 0–12 V).
- Typical tone ring air gap: roughly 0.5–2.0 mm (vehicle-specific).
- Frequency: proportional to wheel speed — a few Hz at very low speeds up to several hundred Hz at highway speeds. Verify with vehicle service data for exact values.
Diagnostic algorithm
- Use a scan tool to capture the specific wheel(s) flagged and to view live wheel speed sensor data and freeze frame. Note whether the signal is absent, intermittent, low amplitude, or noisy.
- Visually inspect the sensor, connector, wiring along the harness to the ABS module and the tone ring for physical damage, contamination or missing teeth. Repair visible issues.
- With ignition ON (engine off), backprobe the sensor connector. For active sensors verify reference voltage (typically 5 V) and ground; for passive sensors measure DC resistance and compare to spec. Replace if out of range.
- Rotate the wheel (or lift vehicle safely on a hoist) and observe sensor output with an oscilloscope or a multimeter AC reading. Passive sensors should produce an AC waveform; active sensors should produce a switching waveform. Look for clean pulses without dropouts.
- Check continuity and insulation of wiring from sensor to ABS module; look for shorts to chassis ground or battery. Wiggle harness while monitoring to find intermittent faults.
- Verify tone ring condition and sensor air gap; correct spacing and repair/replace tone ring if teeth damaged or missing.
- If wiring and sensor test good but fault persists, verify ABS module inputs and grounds; consider resistance checks at module connector. If module input is confirmed open/short internally, module replacement or repair may be required.
- After repairs, clear codes, perform a road test and re-scan to confirm code does not return and that wheel speed readings are consistent across all wheels.
Likely causes
- Sensor wiring harness rubbed through at suspension or steering joint
- Connector contaminated with water/road salt causing high resistance or intermittent contact
- Physical damage to sensor during brake/axle service or wheel hub replacement
- Tone ring teeth chipped, missing, or contaminated with rust/debris causing no/irregular pulses
Fault status
Status
ABS/Traction control module reports a fault on a wheel speed sensor circuit (C1385). The circuit is indicating open, short, no signal or irregular signal. Inspect sensor, tone ring, wiring/connectors, and module inputs.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
C1385
MITSUBISHI
C — Chassis
Yaw rate sensor
Views:
UK: 16
EN: 24
RU: 27
AI status
Completed
Completed
100%
Causes
- Damaged or contaminated wheel speed sensor
- Broken/frayed wiring, chafed insulation or damaged connector
- Corroded or loose connector pins or poor ground
- Missing, damaged or heavily corroded tone ring/reluctor
- Sensor air gap out of specification or magnetized sensor degraded
- Intermittent short to battery or ground, or high circuit resistance
Symptoms
- ABS warning lamp illuminated
- Traction control/ESC warning light may be on or system disabled
- Erratic or non-functioning speedometer (on some vehicles)
- Uncommanded ABS activation, pulsing brakes, or reduced braking performance
- Intermittent faults that clear when moving or after driving through water
- Stored freeze frame or live data showing missing/low frequency sensor signal
What to check
- Read ABS/BCM/TCU trouble codes and freeze frame with a capable scan tool
- Inspect sensor, connector and wiring harness at the affected wheel for damage, corrosion or looseness
- Visually inspect tone ring/reluctor for missing or damaged teeth, rust, or debris
- Backprobe connector with ignition ON and wiggle harness to check for intermittent faults
- Measure sensor resistance and compare to manufacturer spec
- Check sensor output while wheel is rotated (oscilloscope or multimeter AC measurement for passive sensors; DC or waveform for active sensors)
Signal parameters
- Passive (variable reluctance) sensors: DC resistance typically ~500–2000 Ω (manufacturer dependent); generate AC voltage pulses whose amplitude increases with wheel speed (examples: ~0.1–2.0 Vrms at low speeds).
- Active (Hall/VR with amplifier) sensors: require reference supply (commonly 5 V) and output a square or pulse waveform ~0–5 V (some systems use 0–12 V).
- Typical tone ring air gap: roughly 0.5–2.0 mm (vehicle-specific).
- Frequency: proportional to wheel speed — a few Hz at very low speeds up to several hundred Hz at highway speeds. Verify with vehicle service data for exact values.
Diagnostic algorithm
- Use a scan tool to capture the specific wheel(s) flagged and to view live wheel speed sensor data and freeze frame. Note whether the signal is absent, intermittent, low amplitude, or noisy.
- Visually inspect the sensor, connector, wiring along the harness to the ABS module and the tone ring for physical damage, contamination or missing teeth. Repair visible issues.
- With ignition ON (engine off), backprobe the sensor connector. For active sensors verify reference voltage (typically 5 V) and ground; for passive sensors measure DC resistance and compare to spec. Replace if out of range.
- Rotate the wheel (or lift vehicle safely on a hoist) and observe sensor output with an oscilloscope or a multimeter AC reading. Passive sensors should produce an AC waveform; active sensors should produce a switching waveform. Look for clean pulses without dropouts.
- Check continuity and insulation of wiring from sensor to ABS module; look for shorts to chassis ground or battery. Wiggle harness while monitoring to find intermittent faults.
- Verify tone ring condition and sensor air gap; correct spacing and repair/replace tone ring if teeth damaged or missing.
- If wiring and sensor test good but fault persists, verify ABS module inputs and grounds; consider resistance checks at module connector. If module input is confirmed open/short internally, module replacement or repair may be required.
- After repairs, clear codes, perform a road test and re-scan to confirm code does not return and that wheel speed readings are consistent across all wheels.
Likely causes
- Sensor wiring harness rubbed through at suspension or steering joint
- Connector contaminated with water/road salt causing high resistance or intermittent contact
- Physical damage to sensor during brake/axle service or wheel hub replacement
- Tone ring teeth chipped, missing, or contaminated with rust/debris causing no/irregular pulses
Fault status
Status
ABS/Traction control module reports a fault on a wheel speed sensor circuit (C1385). The circuit is indicating open, short, no signal or irregular signal. Inspect sensor, tone ring, wiring/connectors, and module inputs.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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+100 karma for a short comment :)
Was this AI description helpful?
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