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Home / DTC / C1042 — Right front wheel speed sensor

C1042 — Right front wheel speed sensor

Detailed page for trouble code C1042.

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C1042

ALFA ROMEO C — Chassis

Right front wheel speed sensor

Brand: ALFA ROMEO
Type: C — Chassis
Views: UK: 27 EN: 40 RU: 34
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or failed right front wheel speed sensor
  • Open, shorted, corroded or disconnected sensor connector or wiring
  • Damaged or contaminated tone ring (reluctor) or missing teeth
  • Incorrect sensor air gap or misalignment
  • Intermittent connection due to movement or corrosion
  • Faulty ABS/traction control module or internal driver fault

Symptoms

  • ABS, traction control or stability warning lamp illuminated
  • Reduced ABS or traction system functionality
  • Inconsistent or frozen speed reading for right front wheel in scan tool data
  • Brake pulsation or unusual noises near the wheel (if tone ring damaged)
  • Possible intermittent loss of ABS until vehicle restarted or speed changes

What to check

  • Read and record freeze frame and live data with a compatible scan tool (wheel speed values and fault history)
  • Visually inspect right front sensor, wiring, connector and tone ring for damage, contamination or missing pieces
  • Check for corrosion, bent pins or moisture in the sensor connector and at the ABS module harness
  • Backprobe connector to observe raw sensor signal with a scope or multimeter (where applicable)
  • Wiggle-test harness while monitoring live data to detect intermittent faults
  • Compare right front wheel speed reading to other wheels while driving slowly

Signal parameters

  • Passive (magnetic) sensor: AC waveform; amplitude increases with wheel speed. Expect small AC volts at low speed, rising with speed
  • Active (hall/effect) sensor: DC-referenced pulse/square waveform (typically 0.5–4.5 V or 0–5 V depending on design) with frequency proportional to wheel speed
  • At rest: wheel speed signal should be steady (0 V/0 Hz for passive or stable idle voltage for active)
  • During rotation: clean repeating waveform, no missing pulses; frequency increases smoothly with wheel speed
  • If using CAN/CAN-FD: wheel speed message for right front should update at the expected rate and track other wheel speeds logically

Diagnostic algorithm

  1. Retrieve all ABS/traction and related codes; note whether C1042 is current or intermittent and record freeze-frame/live data.
  2. Visually inspect right front sensor, connector, wiring harness and tone ring for mechanical damage, contamination or missing teeth.
  3. Clean connector and terminals, then reconnect. Clear codes and perform a short road test while monitoring live wheel speed data.
  4. Backprobe the sensor connector. For passive sensors check for AC voltage while wheel is rotated; for active sensors check for pulsed DC. Use an oscilloscope if available to confirm waveform shape and integrity.
  5. Check sensor resistance and continuity to the ABS module; inspect for short to ground or to battery. Compare to factory specification or a known-good sensor.
  6. Perform a wiggle/strain test on the harness and connector while observing live data to locate intermittent faults.
  7. If wiring and connector are good but signal is absent or abnormal, remove and bench-test or replace the sensor with a known-good unit.
  8. Inspect and repair or replace damaged tone ring or wheel hub if missing/chipped teeth or excessive rust/metal build-up is found.
  9. After repairs, clear codes and confirm proper operation with a thorough test drive and re-check live wheel speed values at various speeds.
  10. If problem persists and wiring and sensor are confirmed good, suspect ABS module input/driver fault and perform module-level diagnostics per factory procedure.

Likely causes

  • Connector corrosion or loose terminal at the right front sensor
  • Broken/chafed wiring harness to the right front hub
  • Failed sensor element (open circuit or no output)
  • Damaged tone ring (cracked, dirty or missing teeth)
  • Sensor gap incorrect after recent suspension or brake work

Fault status

⚠️ Status
Right front wheel speed sensor circuit — signal missing, implausible or out of range; ABS/traction control warning may be active.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

C1041 C1043 C1035 C0040 P0500
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Code

C1042

FIAT C — Chassis

Right front wheel speed sensor

Brand: FIAT
Type: C — Chassis
Views: UK: 23 EN: 37 RU: 34
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or failed right front wheel speed sensor
  • Open, shorted, corroded or disconnected sensor connector or wiring
  • Damaged or contaminated tone ring (reluctor) or missing teeth
  • Incorrect sensor air gap or misalignment
  • Intermittent connection due to movement or corrosion
  • Faulty ABS/traction control module or internal driver fault

Symptoms

  • ABS, traction control or stability warning lamp illuminated
  • Reduced ABS or traction system functionality
  • Inconsistent or frozen speed reading for right front wheel in scan tool data
  • Brake pulsation or unusual noises near the wheel (if tone ring damaged)
  • Possible intermittent loss of ABS until vehicle restarted or speed changes

What to check

  • Read and record freeze frame and live data with a compatible scan tool (wheel speed values and fault history)
  • Visually inspect right front sensor, wiring, connector and tone ring for damage, contamination or missing pieces
  • Check for corrosion, bent pins or moisture in the sensor connector and at the ABS module harness
  • Backprobe connector to observe raw sensor signal with a scope or multimeter (where applicable)
  • Wiggle-test harness while monitoring live data to detect intermittent faults
  • Compare right front wheel speed reading to other wheels while driving slowly

Signal parameters

  • Passive (magnetic) sensor: AC waveform; amplitude increases with wheel speed. Expect small AC volts at low speed, rising with speed
  • Active (hall/effect) sensor: DC-referenced pulse/square waveform (typically 0.5–4.5 V or 0–5 V depending on design) with frequency proportional to wheel speed
  • At rest: wheel speed signal should be steady (0 V/0 Hz for passive or stable idle voltage for active)
  • During rotation: clean repeating waveform, no missing pulses; frequency increases smoothly with wheel speed
  • If using CAN/CAN-FD: wheel speed message for right front should update at the expected rate and track other wheel speeds logically

Diagnostic algorithm

  1. Retrieve all ABS/traction and related codes; note whether C1042 is current or intermittent and record freeze-frame/live data.
  2. Visually inspect right front sensor, connector, wiring harness and tone ring for mechanical damage, contamination or missing teeth.
  3. Clean connector and terminals, then reconnect. Clear codes and perform a short road test while monitoring live wheel speed data.
  4. Backprobe the sensor connector. For passive sensors check for AC voltage while wheel is rotated; for active sensors check for pulsed DC. Use an oscilloscope if available to confirm waveform shape and integrity.
  5. Check sensor resistance and continuity to the ABS module; inspect for short to ground or to battery. Compare to factory specification or a known-good sensor.
  6. Perform a wiggle/strain test on the harness and connector while observing live data to locate intermittent faults.
  7. If wiring and connector are good but signal is absent or abnormal, remove and bench-test or replace the sensor with a known-good unit.
  8. Inspect and repair or replace damaged tone ring or wheel hub if missing/chipped teeth or excessive rust/metal build-up is found.
  9. After repairs, clear codes and confirm proper operation with a thorough test drive and re-check live wheel speed values at various speeds.
  10. If problem persists and wiring and sensor are confirmed good, suspect ABS module input/driver fault and perform module-level diagnostics per factory procedure.

Likely causes

  • Connector corrosion or loose terminal at the right front sensor
  • Broken/chafed wiring harness to the right front hub
  • Failed sensor element (open circuit or no output)
  • Damaged tone ring (cracked, dirty or missing teeth)
  • Sensor gap incorrect after recent suspension or brake work

Fault status

⚠️ Status
Right front wheel speed sensor circuit — signal missing, implausible or out of range; ABS/traction control warning may be active.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

C1041 C1043 C1035 C0040 P0500
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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

C1042

LAND ROVER C — Chassis

Rear axle speed - Pressure sensor

Brand: LAND ROVER
Type: C — Chassis
Views: UK: 17 EN: 36 RU: 22
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or failed right front wheel speed sensor
  • Open, shorted, corroded or disconnected sensor connector or wiring
  • Damaged or contaminated tone ring (reluctor) or missing teeth
  • Incorrect sensor air gap or misalignment
  • Intermittent connection due to movement or corrosion
  • Faulty ABS/traction control module or internal driver fault

Symptoms

  • ABS, traction control or stability warning lamp illuminated
  • Reduced ABS or traction system functionality
  • Inconsistent or frozen speed reading for right front wheel in scan tool data
  • Brake pulsation or unusual noises near the wheel (if tone ring damaged)
  • Possible intermittent loss of ABS until vehicle restarted or speed changes

What to check

  • Read and record freeze frame and live data with a compatible scan tool (wheel speed values and fault history)
  • Visually inspect right front sensor, wiring, connector and tone ring for damage, contamination or missing pieces
  • Check for corrosion, bent pins or moisture in the sensor connector and at the ABS module harness
  • Backprobe connector to observe raw sensor signal with a scope or multimeter (where applicable)
  • Wiggle-test harness while monitoring live data to detect intermittent faults
  • Compare right front wheel speed reading to other wheels while driving slowly

Signal parameters

  • Passive (magnetic) sensor: AC waveform; amplitude increases with wheel speed. Expect small AC volts at low speed, rising with speed
  • Active (hall/effect) sensor: DC-referenced pulse/square waveform (typically 0.5–4.5 V or 0–5 V depending on design) with frequency proportional to wheel speed
  • At rest: wheel speed signal should be steady (0 V/0 Hz for passive or stable idle voltage for active)
  • During rotation: clean repeating waveform, no missing pulses; frequency increases smoothly with wheel speed
  • If using CAN/CAN-FD: wheel speed message for right front should update at the expected rate and track other wheel speeds logically

Diagnostic algorithm

  1. Retrieve all ABS/traction and related codes; note whether C1042 is current or intermittent and record freeze-frame/live data.
  2. Visually inspect right front sensor, connector, wiring harness and tone ring for mechanical damage, contamination or missing teeth.
  3. Clean connector and terminals, then reconnect. Clear codes and perform a short road test while monitoring live wheel speed data.
  4. Backprobe the sensor connector. For passive sensors check for AC voltage while wheel is rotated; for active sensors check for pulsed DC. Use an oscilloscope if available to confirm waveform shape and integrity.
  5. Check sensor resistance and continuity to the ABS module; inspect for short to ground or to battery. Compare to factory specification or a known-good sensor.
  6. Perform a wiggle/strain test on the harness and connector while observing live data to locate intermittent faults.
  7. If wiring and connector are good but signal is absent or abnormal, remove and bench-test or replace the sensor with a known-good unit.
  8. Inspect and repair or replace damaged tone ring or wheel hub if missing/chipped teeth or excessive rust/metal build-up is found.
  9. After repairs, clear codes and confirm proper operation with a thorough test drive and re-check live wheel speed values at various speeds.
  10. If problem persists and wiring and sensor are confirmed good, suspect ABS module input/driver fault and perform module-level diagnostics per factory procedure.

Likely causes

  • Connector corrosion or loose terminal at the right front sensor
  • Broken/chafed wiring harness to the right front hub
  • Failed sensor element (open circuit or no output)
  • Damaged tone ring (cracked, dirty or missing teeth)
  • Sensor gap incorrect after recent suspension or brake work

Fault status

⚠️ Status
Right front wheel speed sensor circuit — signal missing, implausible or out of range; ABS/traction control warning may be active.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

C1041 C1043 C1035 C0040 P0500
160

Browse 160 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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