Code
C1233
HUMMER
C — Chassis
Right Front Wheel Speed Circuit Open or Shorted
Views:
UK: 8
EN: 16
RU: 10
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring between right front wheel speed sensor and ABS module
- Corroded or loose sensor connector
- Failed wheel speed sensor (magnetic or Hall-effect)
- Damaged or missing tone ring/reluctor on hub or axle
- Contaminated sensor (metal debris, heavy rust) or physical damage
- Poor ground or reference voltage at the sensor circuit
Symptoms
- ABS light illuminated (and possibly traction/stability light)
- Loss of ABS/traction control functions for braking and stability
- Possible brake pulsation or erratic ABS behavior under braking
- ABS warning on dash; speedometer usually unaffected on modern vehicles but cruise/stability may be disabled
- Diagnostic trouble code C1233 stored in ABS module
What to check
- Scan vehicle with a capable scan tool; read ABS module DTCs and freeze-frame data
- Visually inspect right front wheel area: sensor, connector, tone ring, and wiring harness for damage or contamination
- Check connector for corrosion, bent pins, or water intrusion; ensure secure mating
- Backprobe sensor connector with key ON to verify reference voltage and ground (if 3‑wire sensor) or measure resistance (if 2‑wire passive)
- Spin wheel and observe sensor signal with oscilloscope or scan tool live data
- Perform wiggle test on wiring from sensor to ABS module while watching live data or test lamp
Signal parameters
- Passive (2‑wire) magnetic sensor resistance typically ~500–2000 ohms (vehicle-specific). Generates AC voltage pulses when wheel spins.
- Active (3‑wire) Hall/variable reluctance sensor: reference voltage typically ~5 V (±0.5 V) with dedicated ground; output pulses ~0.1–4.9 V or square wave while spinning.
- With wheel stationary and key ON: passive sensor shows finite resistance; active sensor shows reference voltage on reference pin and ~0 V on signal until wheel turns.
- When spinning: clean waveform on oscilloscope (regular pulses). Erratic, missing, or no pulses indicate sensor/tone ring/wiring issues.
Diagnostic algorithm
- Safety first: park on level surface, chock wheels, lift vehicle securely if needed and use jack stands before working on wheel/hub.
- Retrieve all ABS/traction DTCs and freeze-frame data; note related codes (left/right or other speed sensor codes).
- Visually inspect right front sensor, connector and tone ring for damage, debris, or missing teeth. Repair obvious mechanical damage.
- With key ON (engine off), backprobe connector: for 3‑wire sensor confirm reference voltage (~5 V) and ground; for 2‑wire measure sensor resistance. Compare to spec.
- With wheel raised, spin wheel by hand while monitoring signal with scan tool or oscilloscope. Look for regular pulses. Perform wiggle test of harness and connector while observing signal.
- If no signal or erratic signal, unplug sensor and check for open/short to ground/power between harness connector and ABS module (continuity to module pins, check for short to ground or B+).
- If wiring and module pins test good, bench test or replace the right front wheel speed sensor and retest signal/wheel spin.
- If new sensor still no correct signal, trace/repair wiring back to ABS module; if wiring continuity and no shorts and module does not respond, consider ABS module fault and follow manufacturer module testing/repair procedures.
- After repair, clear codes, perform road test to confirm proper operation and that the code does not return.
Likely causes
- Broken wire at steering knuckle or inside harness due to suspension movement
- Corroded connector at wheel hub (most common on vehicles exposed to road salt)
- Failed right front wheel speed sensor from impact or wear
- Damaged tone ring (chipped/missing teeth) causing no or erratic pulses
- Short to battery or ground from chafed wiring
- Connector pin pushed out or bent
Fault status
Status
Right Front Wheel Speed Circuit Open or Shorted detected by ABS module. The right front wheel speed signal is missing or out of range; ABS/traction/stability functions may be disabled until the fault is corrected.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
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Code
C1233
HYUNDAI
C — Chassis
Front Pressure Sensor | High Pressure Accumulator Short Term Charge Error
Views:
UK: 14
EN: 22
RU: 15
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring between right front wheel speed sensor and ABS module
- Corroded or loose sensor connector
- Failed wheel speed sensor (magnetic or Hall-effect)
- Damaged or missing tone ring/reluctor on hub or axle
- Contaminated sensor (metal debris, heavy rust) or physical damage
- Poor ground or reference voltage at the sensor circuit
Symptoms
- ABS light illuminated (and possibly traction/stability light)
- Loss of ABS/traction control functions for braking and stability
- Possible brake pulsation or erratic ABS behavior under braking
- ABS warning on dash; speedometer usually unaffected on modern vehicles but cruise/stability may be disabled
- Diagnostic trouble code C1233 stored in ABS module
What to check
- Scan vehicle with a capable scan tool; read ABS module DTCs and freeze-frame data
- Visually inspect right front wheel area: sensor, connector, tone ring, and wiring harness for damage or contamination
- Check connector for corrosion, bent pins, or water intrusion; ensure secure mating
- Backprobe sensor connector with key ON to verify reference voltage and ground (if 3‑wire sensor) or measure resistance (if 2‑wire passive)
- Spin wheel and observe sensor signal with oscilloscope or scan tool live data
- Perform wiggle test on wiring from sensor to ABS module while watching live data or test lamp
Signal parameters
- Passive (2‑wire) magnetic sensor resistance typically ~500–2000 ohms (vehicle-specific). Generates AC voltage pulses when wheel spins.
- Active (3‑wire) Hall/variable reluctance sensor: reference voltage typically ~5 V (±0.5 V) with dedicated ground; output pulses ~0.1–4.9 V or square wave while spinning.
- With wheel stationary and key ON: passive sensor shows finite resistance; active sensor shows reference voltage on reference pin and ~0 V on signal until wheel turns.
- When spinning: clean waveform on oscilloscope (regular pulses). Erratic, missing, or no pulses indicate sensor/tone ring/wiring issues.
Diagnostic algorithm
- Safety first: park on level surface, chock wheels, lift vehicle securely if needed and use jack stands before working on wheel/hub.
- Retrieve all ABS/traction DTCs and freeze-frame data; note related codes (left/right or other speed sensor codes).
- Visually inspect right front sensor, connector and tone ring for damage, debris, or missing teeth. Repair obvious mechanical damage.
- With key ON (engine off), backprobe connector: for 3‑wire sensor confirm reference voltage (~5 V) and ground; for 2‑wire measure sensor resistance. Compare to spec.
- With wheel raised, spin wheel by hand while monitoring signal with scan tool or oscilloscope. Look for regular pulses. Perform wiggle test of harness and connector while observing signal.
- If no signal or erratic signal, unplug sensor and check for open/short to ground/power between harness connector and ABS module (continuity to module pins, check for short to ground or B+).
- If wiring and module pins test good, bench test or replace the right front wheel speed sensor and retest signal/wheel spin.
- If new sensor still no correct signal, trace/repair wiring back to ABS module; if wiring continuity and no shorts and module does not respond, consider ABS module fault and follow manufacturer module testing/repair procedures.
- After repair, clear codes, perform road test to confirm proper operation and that the code does not return.
Likely causes
- Broken wire at steering knuckle or inside harness due to suspension movement
- Corroded connector at wheel hub (most common on vehicles exposed to road salt)
- Failed right front wheel speed sensor from impact or wear
- Damaged tone ring (chipped/missing teeth) causing no or erratic pulses
- Short to battery or ground from chafed wiring
- Connector pin pushed out or bent
Fault status
Status
Right Front Wheel Speed Circuit Open or Shorted detected by ABS module. The right front wheel speed signal is missing or out of range; ABS/traction/stability functions may be disabled until the fault is corrected.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
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Code
C1233
Other
C — Chassis
Speed Wheel LF Input Signal Missing
Views:
UK: 19
EN: 29
RU: 34
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring between right front wheel speed sensor and ABS module
- Corroded or loose sensor connector
- Failed wheel speed sensor (magnetic or Hall-effect)
- Damaged or missing tone ring/reluctor on hub or axle
- Contaminated sensor (metal debris, heavy rust) or physical damage
- Poor ground or reference voltage at the sensor circuit
Symptoms
- ABS light illuminated (and possibly traction/stability light)
- Loss of ABS/traction control functions for braking and stability
- Possible brake pulsation or erratic ABS behavior under braking
- ABS warning on dash; speedometer usually unaffected on modern vehicles but cruise/stability may be disabled
- Diagnostic trouble code C1233 stored in ABS module
What to check
- Scan vehicle with a capable scan tool; read ABS module DTCs and freeze-frame data
- Visually inspect right front wheel area: sensor, connector, tone ring, and wiring harness for damage or contamination
- Check connector for corrosion, bent pins, or water intrusion; ensure secure mating
- Backprobe sensor connector with key ON to verify reference voltage and ground (if 3‑wire sensor) or measure resistance (if 2‑wire passive)
- Spin wheel and observe sensor signal with oscilloscope or scan tool live data
- Perform wiggle test on wiring from sensor to ABS module while watching live data or test lamp
Signal parameters
- Passive (2‑wire) magnetic sensor resistance typically ~500–2000 ohms (vehicle-specific). Generates AC voltage pulses when wheel spins.
- Active (3‑wire) Hall/variable reluctance sensor: reference voltage typically ~5 V (±0.5 V) with dedicated ground; output pulses ~0.1–4.9 V or square wave while spinning.
- With wheel stationary and key ON: passive sensor shows finite resistance; active sensor shows reference voltage on reference pin and ~0 V on signal until wheel turns.
- When spinning: clean waveform on oscilloscope (regular pulses). Erratic, missing, or no pulses indicate sensor/tone ring/wiring issues.
Diagnostic algorithm
- Safety first: park on level surface, chock wheels, lift vehicle securely if needed and use jack stands before working on wheel/hub.
- Retrieve all ABS/traction DTCs and freeze-frame data; note related codes (left/right or other speed sensor codes).
- Visually inspect right front sensor, connector and tone ring for damage, debris, or missing teeth. Repair obvious mechanical damage.
- With key ON (engine off), backprobe connector: for 3‑wire sensor confirm reference voltage (~5 V) and ground; for 2‑wire measure sensor resistance. Compare to spec.
- With wheel raised, spin wheel by hand while monitoring signal with scan tool or oscilloscope. Look for regular pulses. Perform wiggle test of harness and connector while observing signal.
- If no signal or erratic signal, unplug sensor and check for open/short to ground/power between harness connector and ABS module (continuity to module pins, check for short to ground or B+).
- If wiring and module pins test good, bench test or replace the right front wheel speed sensor and retest signal/wheel spin.
- If new sensor still no correct signal, trace/repair wiring back to ABS module; if wiring continuity and no shorts and module does not respond, consider ABS module fault and follow manufacturer module testing/repair procedures.
- After repair, clear codes, perform road test to confirm proper operation and that the code does not return.
Likely causes
- Broken wire at steering knuckle or inside harness due to suspension movement
- Corroded connector at wheel hub (most common on vehicles exposed to road salt)
- Failed right front wheel speed sensor from impact or wear
- Damaged tone ring (chipped/missing teeth) causing no or erratic pulses
- Short to battery or ground from chafed wiring
- Connector pin pushed out or bent
Fault status
Status
Right Front Wheel Speed Circuit Open or Shorted detected by ABS module. The right front wheel speed signal is missing or out of range; ABS/traction/stability functions may be disabled until the fault is corrected.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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