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Home / DTC / C1221 — Left Front Wheel Speed Sensor Input Signal is 0

C1221 — Left Front Wheel Speed Sensor Input Signal is 0

Detailed page for trouble code C1221.

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C1221

HUMMER C — Chassis

Left Front Wheel Speed Sensor Input Signal is 0

Brand: HUMMER
Type: C — Chassis
Views: UK: 9 EN: 24 RU: 14
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or shorted wiring between LF sensor and ABS module
  • Corroded, loose, or damaged LF sensor connector
  • Failed LF wheel speed sensor (passive or active)
  • Missing, damaged, or contaminated tone ring/reluctor on the LF hub
  • Ground or power supply fault to the sensor circuit
  • Faulty ABS/traction control module or internal input circuitry

Symptoms

  • ABS warning lamp illuminated
  • Traction control/stability light may illuminate and system may be disabled
  • Loss of ABS/traction control functions for LF wheel
  • Possible ABS activation absent during hard braking or loss of traction
  • Irregular brake feel only in rare failure modes (speedometer typically not affected if fed from different source)

What to check

  • Scan for related ABS/traction codes and freeze frame; record live data for all wheel speed sensors
  • Visually inspect LF sensor, connector, and wiring for corrosion, damage, pin push-out, or contamination
  • Backprobe the LF sensor connector with ignition ON and check for reference voltage/ground (for active sensors) or resistance (for passive sensors)
  • Compare LF sensor raw data with other wheel sensors using a scan tool while wheel is rotated
  • Check continuity of signal wire between sensor connector and ABS module, and for shorts to ground or battery
  • Rotate wheel by hand (or lift vehicle safely) and observe sensor output with multimeter (AC) or oscilloscope

Signal parameters

  • Condition reported: no pulses detected from the LF sensor (signal = 0)
  • Passive (magnetic) sensor: typically produces AC voltage whose amplitude increases with wheel speed — expect measurable AC when wheel is rotated (millivolt to volt scale depending on speed)
  • Active (hall/VR with internal electronics) sensor: produces square/pulsed 0–Vref (usually 0–5V) waveform while wheel rotates
  • At rest with ignition ON: passive sensors typically read zero DC; active sensors may show a reference voltage on one pin and a steady output when not rotating
  • Use oscilloscope to confirm waveform shape, amplitude and frequency proportional to wheel speed; no waveform = fault

Diagnostic algorithm

  1. Step 1 — Scan and confirm: Read all ABS/traction codes and view live data for four wheel speeds. Verify LF shows 0 while others change with wheel rotation.
  2. Step 2 — Visual & connector: With ignition OFF, inspect LF sensor connector pins for corrosion, bent pins, water intrusion, or pushed pins. Re-seat connector.
  3. Step 3 — Wiggle test and power/ground: With ignition ON, backprobe connector. Verify sensor reference power and ground (for active sensors). Wiggle harness and watch live data for intermittent changes.
  4. Step 4 — Measure sensor: For passive sensor measure AC voltage while spinning wheel; for active measure output pulses with DSO or multimeter (frequency or pulsed voltage). If no output, remove sensor and bench-test (or swap with a known good same-side sensor if available).
  5. Step 5 — Check wiring: With sensor disconnected, check continuity between sensor signal pin and module pin and check for short to ground or battery. Repair any open/shorted circuits found.
  6. Step 6 — Inspect tone ring/hub: Inspect reluctor ring for missing teeth, heavy rust, or debris and verify sensor-to-reluctor air gap is within spec. Replace or repair as needed.
  7. Step 7 — Replace suspect parts: If sensor wiring and tone ring are good and sensor bench-test fails, replace LF wheel speed sensor. Clear codes and road-test to verify.
  8. Step 8 — Module check: If new sensor and wiring are good but code returns, test/replace ABS module only after confirming supply/ground and communication signals.

Likely causes

  • Corroded or disconnected LF sensor connector
  • Damaged wiring harness (open to signal or short to ground)
  • Failed LF wheel speed sensor
  • Damaged/missing tone ring or excessive air gap
  • Module fault (less common)

Fault status

⚠️ Status
C1221 — Left Front Wheel Speed Sensor Input Signal = 0. No wheel speed pulses detected from left front sensor; ABS/traction control may be disabled.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.0 hours

Similar codes

C1220 C1222 C1230 C1231 C1241
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Code

C1221

HYUNDAI C — Chassis

Throttle Position Sensor(TPS) - Low Input

Brand: HYUNDAI
Type: C — Chassis
Views: UK: 16 EN: 24 RU: 21
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or shorted wiring between LF sensor and ABS module
  • Corroded, loose, or damaged LF sensor connector
  • Failed LF wheel speed sensor (passive or active)
  • Missing, damaged, or contaminated tone ring/reluctor on the LF hub
  • Ground or power supply fault to the sensor circuit
  • Faulty ABS/traction control module or internal input circuitry

Symptoms

  • ABS warning lamp illuminated
  • Traction control/stability light may illuminate and system may be disabled
  • Loss of ABS/traction control functions for LF wheel
  • Possible ABS activation absent during hard braking or loss of traction
  • Irregular brake feel only in rare failure modes (speedometer typically not affected if fed from different source)

What to check

  • Scan for related ABS/traction codes and freeze frame; record live data for all wheel speed sensors
  • Visually inspect LF sensor, connector, and wiring for corrosion, damage, pin push-out, or contamination
  • Backprobe the LF sensor connector with ignition ON and check for reference voltage/ground (for active sensors) or resistance (for passive sensors)
  • Compare LF sensor raw data with other wheel sensors using a scan tool while wheel is rotated
  • Check continuity of signal wire between sensor connector and ABS module, and for shorts to ground or battery
  • Rotate wheel by hand (or lift vehicle safely) and observe sensor output with multimeter (AC) or oscilloscope

Signal parameters

  • Condition reported: no pulses detected from the LF sensor (signal = 0)
  • Passive (magnetic) sensor: typically produces AC voltage whose amplitude increases with wheel speed — expect measurable AC when wheel is rotated (millivolt to volt scale depending on speed)
  • Active (hall/VR with internal electronics) sensor: produces square/pulsed 0–Vref (usually 0–5V) waveform while wheel rotates
  • At rest with ignition ON: passive sensors typically read zero DC; active sensors may show a reference voltage on one pin and a steady output when not rotating
  • Use oscilloscope to confirm waveform shape, amplitude and frequency proportional to wheel speed; no waveform = fault

Diagnostic algorithm

  1. Step 1 — Scan and confirm: Read all ABS/traction codes and view live data for four wheel speeds. Verify LF shows 0 while others change with wheel rotation.
  2. Step 2 — Visual & connector: With ignition OFF, inspect LF sensor connector pins for corrosion, bent pins, water intrusion, or pushed pins. Re-seat connector.
  3. Step 3 — Wiggle test and power/ground: With ignition ON, backprobe connector. Verify sensor reference power and ground (for active sensors). Wiggle harness and watch live data for intermittent changes.
  4. Step 4 — Measure sensor: For passive sensor measure AC voltage while spinning wheel; for active measure output pulses with DSO or multimeter (frequency or pulsed voltage). If no output, remove sensor and bench-test (or swap with a known good same-side sensor if available).
  5. Step 5 — Check wiring: With sensor disconnected, check continuity between sensor signal pin and module pin and check for short to ground or battery. Repair any open/shorted circuits found.
  6. Step 6 — Inspect tone ring/hub: Inspect reluctor ring for missing teeth, heavy rust, or debris and verify sensor-to-reluctor air gap is within spec. Replace or repair as needed.
  7. Step 7 — Replace suspect parts: If sensor wiring and tone ring are good and sensor bench-test fails, replace LF wheel speed sensor. Clear codes and road-test to verify.
  8. Step 8 — Module check: If new sensor and wiring are good but code returns, test/replace ABS module only after confirming supply/ground and communication signals.

Likely causes

  • Corroded or disconnected LF sensor connector
  • Damaged wiring harness (open to signal or short to ground)
  • Failed LF wheel speed sensor
  • Damaged/missing tone ring or excessive air gap
  • Module fault (less common)

Fault status

⚠️ Status
C1221 — Left Front Wheel Speed Sensor Input Signal = 0. No wheel speed pulses detected from left front sensor; ABS/traction control may be disabled.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.0 hours

Similar codes

C1220 C1222 C1230 C1231 C1241
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Keep it short and practical. Up to 500 characters.
Send to email
Code

C1221

Other C — Chassis

Lamp ABS Warning Output Circuit Short To Ground

Brand: Other
Type: C — Chassis
Views: UK: 20 EN: 27 RU: 22
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or shorted wiring between LF sensor and ABS module
  • Corroded, loose, or damaged LF sensor connector
  • Failed LF wheel speed sensor (passive or active)
  • Missing, damaged, or contaminated tone ring/reluctor on the LF hub
  • Ground or power supply fault to the sensor circuit
  • Faulty ABS/traction control module or internal input circuitry

Symptoms

  • ABS warning lamp illuminated
  • Traction control/stability light may illuminate and system may be disabled
  • Loss of ABS/traction control functions for LF wheel
  • Possible ABS activation absent during hard braking or loss of traction
  • Irregular brake feel only in rare failure modes (speedometer typically not affected if fed from different source)

What to check

  • Scan for related ABS/traction codes and freeze frame; record live data for all wheel speed sensors
  • Visually inspect LF sensor, connector, and wiring for corrosion, damage, pin push-out, or contamination
  • Backprobe the LF sensor connector with ignition ON and check for reference voltage/ground (for active sensors) or resistance (for passive sensors)
  • Compare LF sensor raw data with other wheel sensors using a scan tool while wheel is rotated
  • Check continuity of signal wire between sensor connector and ABS module, and for shorts to ground or battery
  • Rotate wheel by hand (or lift vehicle safely) and observe sensor output with multimeter (AC) or oscilloscope

Signal parameters

  • Condition reported: no pulses detected from the LF sensor (signal = 0)
  • Passive (magnetic) sensor: typically produces AC voltage whose amplitude increases with wheel speed — expect measurable AC when wheel is rotated (millivolt to volt scale depending on speed)
  • Active (hall/VR with internal electronics) sensor: produces square/pulsed 0–Vref (usually 0–5V) waveform while wheel rotates
  • At rest with ignition ON: passive sensors typically read zero DC; active sensors may show a reference voltage on one pin and a steady output when not rotating
  • Use oscilloscope to confirm waveform shape, amplitude and frequency proportional to wheel speed; no waveform = fault

Diagnostic algorithm

  1. Step 1 — Scan and confirm: Read all ABS/traction codes and view live data for four wheel speeds. Verify LF shows 0 while others change with wheel rotation.
  2. Step 2 — Visual & connector: With ignition OFF, inspect LF sensor connector pins for corrosion, bent pins, water intrusion, or pushed pins. Re-seat connector.
  3. Step 3 — Wiggle test and power/ground: With ignition ON, backprobe connector. Verify sensor reference power and ground (for active sensors). Wiggle harness and watch live data for intermittent changes.
  4. Step 4 — Measure sensor: For passive sensor measure AC voltage while spinning wheel; for active measure output pulses with DSO or multimeter (frequency or pulsed voltage). If no output, remove sensor and bench-test (or swap with a known good same-side sensor if available).
  5. Step 5 — Check wiring: With sensor disconnected, check continuity between sensor signal pin and module pin and check for short to ground or battery. Repair any open/shorted circuits found.
  6. Step 6 — Inspect tone ring/hub: Inspect reluctor ring for missing teeth, heavy rust, or debris and verify sensor-to-reluctor air gap is within spec. Replace or repair as needed.
  7. Step 7 — Replace suspect parts: If sensor wiring and tone ring are good and sensor bench-test fails, replace LF wheel speed sensor. Clear codes and road-test to verify.
  8. Step 8 — Module check: If new sensor and wiring are good but code returns, test/replace ABS module only after confirming supply/ground and communication signals.

Likely causes

  • Corroded or disconnected LF sensor connector
  • Damaged wiring harness (open to signal or short to ground)
  • Failed LF wheel speed sensor
  • Damaged/missing tone ring or excessive air gap
  • Module fault (less common)

Fault status

⚠️ Status
C1221 — Left Front Wheel Speed Sensor Input Signal = 0. No wheel speed pulses detected from left front sensor; ABS/traction control may be disabled.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.0 hours

Similar codes

C1220 C1222 C1230 C1231 C1241
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