Code
C1222
HUMMER
C — Chassis
Right Front Wheel Speed Sensor Input Signal is 0
Views:
UK: 8
EN: 12
RU: 23
AI status
Completed
Completed
100%
Causes
- Open or short in the right front wheel speed sensor wiring or connector
- Failed right front wheel speed sensor (hall or variable reluctance)
- Damaged or missing tone ring/reluctor on the wheel/hub
- Excessive air gap between sensor and reluctor
- Contamination (metal shavings, corrosion) on the sensor or reluctor
- Faulty ABS/traction control module or poor module ground/power
Symptoms
- ABS warning lamp illuminated
- Traction control/stability control disabled or warning lamp on
- ABS not functioning under heavy braking (system degrades to non-ABS braking)
- Speedometer or cruise control may behave erratically or be disabled (vehicle dependent)
- No wheel speed reading for right front shown in live data
What to check
- Scan tool: read DTCs, freeze frame, and view live wheel speed sensor data while rotating the wheel
- Visual inspection of right front sensor, tone ring, harness and connector for damage, contamination or corrosion
- Wiggle test harness and connector while observing live data for intermittent changes
- Check fuses and ABS module power/ground circuits for proper voltage and continuity
- Measure sensor resistance and compare with service data (if available) or compare with opposite wheel sensor
- Use an oscilloscope to verify waveform while wheel is rotated (preferred for active sensors)
Signal parameters
- Active (Hall/active) sensor: typically a square wave or digital pulse referenced to 5 V (or module supply) — 0 to ~5 V pulses; frequency proportional to wheel speed
- Passive (VR) sensor: sine/AC waveform with amplitude increasing with speed (often tens of millivolts to several volts depending on speed)
- At rest: no pulses (0 Hz) is normal; code indicates the module expects a signal and is seeing a stuck 0 (no transitions) when vehicle is moving
- Compare wave amplitude/frequency to the other three wheel sensors for similar vehicle speed
Diagnostic algorithm
- Retrieve all ABS/traction DTCs and clear codes. Test drive or rotate wheel while monitoring live data to confirm C1222 returns.
- Visually inspect the right front wheel area: sensor, connector, wiring route, and tone ring. Repair any obvious damage or contamination.
- With ignition on, backprobe sensor connector and check for reference voltage (if active sensor) and ground. Verify ABS module supplies proper reference and ground.
- Measure sensor resistance (if specified by manufacturer) or compare resistance to opposite side sensor. An open or shorted reading indicates a bad sensor or wiring.
- Rotate the wheel by hand (vehicle safely supported) while watching live data or using an oscilloscope to verify pulse waveform or AC voltage from the sensor. No waveform indicates sensor or wiring fault.
- If waveform present at sensor but not at module connector, inspect/repair harness between sensor and module. If waveform present at module input but module still flags code, suspect module fault.
- Inspect tone ring for missing or damaged teeth and check sensor-to-reluctor air gap; replace or correct as necessary.
- After repairs, clear codes and verify sensor data under road test to ensure C1222 does not return and ABS/traction systems operate normally.
Likely causes
- Broken or disconnected sensor connector at the wheel
- Corroded or shorted wiring in the harness near the front suspension
- Failed wheel speed sensor from impact or exposure
- Damaged reluctor/tone ring on the hub bearing assembly
Fault status
Status
Right front wheel speed sensor input signal is zero — check sensor, wiring, tone ring, and ABS module power/ground.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
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Code
C1222
HYUNDAI
C — Chassis
Throttle Position Sensor(TPS) - High Input
Views:
UK: 16
EN: 17
RU: 28
AI status
Completed
Completed
100%
Causes
- Open or short in the right front wheel speed sensor wiring or connector
- Failed right front wheel speed sensor (hall or variable reluctance)
- Damaged or missing tone ring/reluctor on the wheel/hub
- Excessive air gap between sensor and reluctor
- Contamination (metal shavings, corrosion) on the sensor or reluctor
- Faulty ABS/traction control module or poor module ground/power
Symptoms
- ABS warning lamp illuminated
- Traction control/stability control disabled or warning lamp on
- ABS not functioning under heavy braking (system degrades to non-ABS braking)
- Speedometer or cruise control may behave erratically or be disabled (vehicle dependent)
- No wheel speed reading for right front shown in live data
What to check
- Scan tool: read DTCs, freeze frame, and view live wheel speed sensor data while rotating the wheel
- Visual inspection of right front sensor, tone ring, harness and connector for damage, contamination or corrosion
- Wiggle test harness and connector while observing live data for intermittent changes
- Check fuses and ABS module power/ground circuits for proper voltage and continuity
- Measure sensor resistance and compare with service data (if available) or compare with opposite wheel sensor
- Use an oscilloscope to verify waveform while wheel is rotated (preferred for active sensors)
Signal parameters
- Active (Hall/active) sensor: typically a square wave or digital pulse referenced to 5 V (or module supply) — 0 to ~5 V pulses; frequency proportional to wheel speed
- Passive (VR) sensor: sine/AC waveform with amplitude increasing with speed (often tens of millivolts to several volts depending on speed)
- At rest: no pulses (0 Hz) is normal; code indicates the module expects a signal and is seeing a stuck 0 (no transitions) when vehicle is moving
- Compare wave amplitude/frequency to the other three wheel sensors for similar vehicle speed
Diagnostic algorithm
- Retrieve all ABS/traction DTCs and clear codes. Test drive or rotate wheel while monitoring live data to confirm C1222 returns.
- Visually inspect the right front wheel area: sensor, connector, wiring route, and tone ring. Repair any obvious damage or contamination.
- With ignition on, backprobe sensor connector and check for reference voltage (if active sensor) and ground. Verify ABS module supplies proper reference and ground.
- Measure sensor resistance (if specified by manufacturer) or compare resistance to opposite side sensor. An open or shorted reading indicates a bad sensor or wiring.
- Rotate the wheel by hand (vehicle safely supported) while watching live data or using an oscilloscope to verify pulse waveform or AC voltage from the sensor. No waveform indicates sensor or wiring fault.
- If waveform present at sensor but not at module connector, inspect/repair harness between sensor and module. If waveform present at module input but module still flags code, suspect module fault.
- Inspect tone ring for missing or damaged teeth and check sensor-to-reluctor air gap; replace or correct as necessary.
- After repairs, clear codes and verify sensor data under road test to ensure C1222 does not return and ABS/traction systems operate normally.
Likely causes
- Broken or disconnected sensor connector at the wheel
- Corroded or shorted wiring in the harness near the front suspension
- Failed wheel speed sensor from impact or exposure
- Damaged reluctor/tone ring on the hub bearing assembly
Fault status
Status
Right front wheel speed sensor input signal is zero — check sensor, wiring, tone ring, and ABS module power/ground.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
Similar codes
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Code
C1222
MITSUBISHI
C — Chassis
Wheel SPD.SNSR.power circuit
Views:
UK: 6
EN: 9
RU: 23
AI status
Completed
Completed
100%
Causes
- Open or short in the right front wheel speed sensor wiring or connector
- Failed right front wheel speed sensor (hall or variable reluctance)
- Damaged or missing tone ring/reluctor on the wheel/hub
- Excessive air gap between sensor and reluctor
- Contamination (metal shavings, corrosion) on the sensor or reluctor
- Faulty ABS/traction control module or poor module ground/power
Symptoms
- ABS warning lamp illuminated
- Traction control/stability control disabled or warning lamp on
- ABS not functioning under heavy braking (system degrades to non-ABS braking)
- Speedometer or cruise control may behave erratically or be disabled (vehicle dependent)
- No wheel speed reading for right front shown in live data
What to check
- Scan tool: read DTCs, freeze frame, and view live wheel speed sensor data while rotating the wheel
- Visual inspection of right front sensor, tone ring, harness and connector for damage, contamination or corrosion
- Wiggle test harness and connector while observing live data for intermittent changes
- Check fuses and ABS module power/ground circuits for proper voltage and continuity
- Measure sensor resistance and compare with service data (if available) or compare with opposite wheel sensor
- Use an oscilloscope to verify waveform while wheel is rotated (preferred for active sensors)
Signal parameters
- Active (Hall/active) sensor: typically a square wave or digital pulse referenced to 5 V (or module supply) — 0 to ~5 V pulses; frequency proportional to wheel speed
- Passive (VR) sensor: sine/AC waveform with amplitude increasing with speed (often tens of millivolts to several volts depending on speed)
- At rest: no pulses (0 Hz) is normal; code indicates the module expects a signal and is seeing a stuck 0 (no transitions) when vehicle is moving
- Compare wave amplitude/frequency to the other three wheel sensors for similar vehicle speed
Diagnostic algorithm
- Retrieve all ABS/traction DTCs and clear codes. Test drive or rotate wheel while monitoring live data to confirm C1222 returns.
- Visually inspect the right front wheel area: sensor, connector, wiring route, and tone ring. Repair any obvious damage or contamination.
- With ignition on, backprobe sensor connector and check for reference voltage (if active sensor) and ground. Verify ABS module supplies proper reference and ground.
- Measure sensor resistance (if specified by manufacturer) or compare resistance to opposite side sensor. An open or shorted reading indicates a bad sensor or wiring.
- Rotate the wheel by hand (vehicle safely supported) while watching live data or using an oscilloscope to verify pulse waveform or AC voltage from the sensor. No waveform indicates sensor or wiring fault.
- If waveform present at sensor but not at module connector, inspect/repair harness between sensor and module. If waveform present at module input but module still flags code, suspect module fault.
- Inspect tone ring for missing or damaged teeth and check sensor-to-reluctor air gap; replace or correct as necessary.
- After repairs, clear codes and verify sensor data under road test to ensure C1222 does not return and ABS/traction systems operate normally.
Likely causes
- Broken or disconnected sensor connector at the wheel
- Corroded or shorted wiring in the harness near the front suspension
- Failed wheel speed sensor from impact or exposure
- Damaged reluctor/tone ring on the hub bearing assembly
Fault status
Status
Right front wheel speed sensor input signal is zero — check sensor, wiring, tone ring, and ABS module power/ground.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
Similar codes
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Code
C1222
Other
C — Chassis
Speed Wheel Mismatch
Views:
UK: 16
EN: 32
RU: 38
AI status
Completed
Completed
100%
Causes
- Open or short in the right front wheel speed sensor wiring or connector
- Failed right front wheel speed sensor (hall or variable reluctance)
- Damaged or missing tone ring/reluctor on the wheel/hub
- Excessive air gap between sensor and reluctor
- Contamination (metal shavings, corrosion) on the sensor or reluctor
- Faulty ABS/traction control module or poor module ground/power
Symptoms
- ABS warning lamp illuminated
- Traction control/stability control disabled or warning lamp on
- ABS not functioning under heavy braking (system degrades to non-ABS braking)
- Speedometer or cruise control may behave erratically or be disabled (vehicle dependent)
- No wheel speed reading for right front shown in live data
What to check
- Scan tool: read DTCs, freeze frame, and view live wheel speed sensor data while rotating the wheel
- Visual inspection of right front sensor, tone ring, harness and connector for damage, contamination or corrosion
- Wiggle test harness and connector while observing live data for intermittent changes
- Check fuses and ABS module power/ground circuits for proper voltage and continuity
- Measure sensor resistance and compare with service data (if available) or compare with opposite wheel sensor
- Use an oscilloscope to verify waveform while wheel is rotated (preferred for active sensors)
Signal parameters
- Active (Hall/active) sensor: typically a square wave or digital pulse referenced to 5 V (or module supply) — 0 to ~5 V pulses; frequency proportional to wheel speed
- Passive (VR) sensor: sine/AC waveform with amplitude increasing with speed (often tens of millivolts to several volts depending on speed)
- At rest: no pulses (0 Hz) is normal; code indicates the module expects a signal and is seeing a stuck 0 (no transitions) when vehicle is moving
- Compare wave amplitude/frequency to the other three wheel sensors for similar vehicle speed
Diagnostic algorithm
- Retrieve all ABS/traction DTCs and clear codes. Test drive or rotate wheel while monitoring live data to confirm C1222 returns.
- Visually inspect the right front wheel area: sensor, connector, wiring route, and tone ring. Repair any obvious damage or contamination.
- With ignition on, backprobe sensor connector and check for reference voltage (if active sensor) and ground. Verify ABS module supplies proper reference and ground.
- Measure sensor resistance (if specified by manufacturer) or compare resistance to opposite side sensor. An open or shorted reading indicates a bad sensor or wiring.
- Rotate the wheel by hand (vehicle safely supported) while watching live data or using an oscilloscope to verify pulse waveform or AC voltage from the sensor. No waveform indicates sensor or wiring fault.
- If waveform present at sensor but not at module connector, inspect/repair harness between sensor and module. If waveform present at module input but module still flags code, suspect module fault.
- Inspect tone ring for missing or damaged teeth and check sensor-to-reluctor air gap; replace or correct as necessary.
- After repairs, clear codes and verify sensor data under road test to ensure C1222 does not return and ABS/traction systems operate normally.
Likely causes
- Broken or disconnected sensor connector at the wheel
- Corroded or shorted wiring in the harness near the front suspension
- Failed wheel speed sensor from impact or exposure
- Damaged reluctor/tone ring on the hub bearing assembly
Fault status
Status
Right front wheel speed sensor input signal is zero — check sensor, wiring, tone ring, and ABS module power/ground.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
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