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Home / DTC / C1743 — Speed Signal Fault

C1743 — Speed Signal Fault

Detailed page for trouble code C1743.

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22,491specific
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C1743

HUMMER C — Chassis

Speed Signal Fault

Brand: HUMMER
Type: C — Chassis
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or shorted speed-sensor wiring or connector
  • Faulty vehicle speed sensor (VSS) or wheel speed sensor
  • Damaged reluctor (tone) ring or missing teeth
  • Poor ground or power supply to sensor or control module
  • Faulty ABS/ESC/BCM/PCM module or internal software error
  • Intermittent CAN/data-bus or communication fault

Symptoms

  • ABS, Traction Control or Stability Control warning light illuminated
  • Cruise control inoperative or disabled
  • Speedometer may be erratic or not working (if speed signal used by instrument cluster)
  • Traction/ABS interventions may be incorrect or disabled
  • Possible limp mode or transmission shifting irregularities (if PCM uses same speed input)

What to check

  • Retrieve freeze frame and full scan-tool data — note when and what modules set C1743
  • Check for other stored codes (P0500, P0720, C0035, etc.) that indicate related faults
  • Inspect sensor connectors and wiring for damage, corrosion, or looseness
  • Verify fuses and power/ground circuits for ABS/ESC and speed sensors
  • Monitor vehicle speed signal(s) with a scan tool while driving or spinning wheels
  • If available, use an oscilloscope to view sensor waveform at connector

Signal parameters

  • Hall-effect sensors: 0–5 V digital square wave referenced to vehicle speed (duty/frequency increases with speed)
  • Variable reluctor sensors: low-voltage AC sine wave; amplitude and frequency increase with speed (typically mV–V depending on speed)
  • Expected no-load frequency/voltage varies by vehicle and wheel; compare left/right or known-good reference
  • Good sensor ground and reference supply (often 5 V or battery depending on sensor type) required for valid signal
  • Typical pulses per wheel/revolution depend on reluctor design (commonly 4–48 teeth)

Diagnostic algorithm

  1. Use a capable scan tool to read all ABS/traction/stability and powertrain modules. Record freeze-frame and live vehicle speed values from multiple modules (ABS, PCM, cluster).
  2. Confirm whether the fault is for wheel sensor(s) or vehicle speed sensor: compare speed reported by each wheel sensor and PCM. Look for mismatch or no reading.
  3. Visually inspect the suspect sensor(s), reluctor ring, and harness for damage, debris, missing teeth, or metal contamination.
  4. Check connectors for corrosion, bent pins, water ingress. Disconnect and inspect terminals; clean and apply correct dielectric where specified.
  5. Verify power and ground at sensor connector (with key on) using a DMM. Confirm reference voltage if sensor requires one.
  6. Probe the sensor signal with an oscilloscope while wheel is rotated or during a drive-by test: verify waveform shape, amplitude and frequency. For hall sensors expect square pulses; for VR expect AC sine wave.
  7. Perform a wiggle test on wiring/connectors while monitoring live data or oscilloscope for intermittent changes. Repair or replace any broken wiring or corroded connectors found.
  8. If sensor and wiring test good, check module grounds and communication lines (CAN). Verify communication integrity with a scan tool.
  9. If wiring and sensors pass tests, consider module fault. Consult service manual for module bench tests, reprogramming or replacement procedures.
  10. After repair, clear codes, perform a test drive and re-scan to ensure C1743 does not return and related systems function normally.

Likely causes

  • Corroded or disconnected sensor connector at VSS or wheel sensor
  • Broken wire in harness where it flexes (frame, wheel well, steering column)
  • Contaminated or damaged reluctor ring on axle/hub
  • Failed hall‑effect or variable reluctor sensor
  • Blown fuse or poor battery/ground connection feeding the sensor/module
  • Faulty ABS/ESC control module or lost CAN messages

Fault status

⚠️ Status
Indicates the ABS/traction control module detected an invalid, missing or implausible vehicle speed signal. May illuminate ABS/TCS warning and disable related functions until resolved.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

P0500 P0720 C0035 C0040 C0100
Repair manuals

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138

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Code

C1743

LAND ROVER C — Chassis

Rear sensor - short circuit to battery

Brand: LAND ROVER
Type: C — Chassis
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or shorted speed-sensor wiring or connector
  • Faulty vehicle speed sensor (VSS) or wheel speed sensor
  • Damaged reluctor (tone) ring or missing teeth
  • Poor ground or power supply to sensor or control module
  • Faulty ABS/ESC/BCM/PCM module or internal software error
  • Intermittent CAN/data-bus or communication fault

Symptoms

  • ABS, Traction Control or Stability Control warning light illuminated
  • Cruise control inoperative or disabled
  • Speedometer may be erratic or not working (if speed signal used by instrument cluster)
  • Traction/ABS interventions may be incorrect or disabled
  • Possible limp mode or transmission shifting irregularities (if PCM uses same speed input)

What to check

  • Retrieve freeze frame and full scan-tool data — note when and what modules set C1743
  • Check for other stored codes (P0500, P0720, C0035, etc.) that indicate related faults
  • Inspect sensor connectors and wiring for damage, corrosion, or looseness
  • Verify fuses and power/ground circuits for ABS/ESC and speed sensors
  • Monitor vehicle speed signal(s) with a scan tool while driving or spinning wheels
  • If available, use an oscilloscope to view sensor waveform at connector

Signal parameters

  • Hall-effect sensors: 0–5 V digital square wave referenced to vehicle speed (duty/frequency increases with speed)
  • Variable reluctor sensors: low-voltage AC sine wave; amplitude and frequency increase with speed (typically mV–V depending on speed)
  • Expected no-load frequency/voltage varies by vehicle and wheel; compare left/right or known-good reference
  • Good sensor ground and reference supply (often 5 V or battery depending on sensor type) required for valid signal
  • Typical pulses per wheel/revolution depend on reluctor design (commonly 4–48 teeth)

Diagnostic algorithm

  1. Use a capable scan tool to read all ABS/traction/stability and powertrain modules. Record freeze-frame and live vehicle speed values from multiple modules (ABS, PCM, cluster).
  2. Confirm whether the fault is for wheel sensor(s) or vehicle speed sensor: compare speed reported by each wheel sensor and PCM. Look for mismatch or no reading.
  3. Visually inspect the suspect sensor(s), reluctor ring, and harness for damage, debris, missing teeth, or metal contamination.
  4. Check connectors for corrosion, bent pins, water ingress. Disconnect and inspect terminals; clean and apply correct dielectric where specified.
  5. Verify power and ground at sensor connector (with key on) using a DMM. Confirm reference voltage if sensor requires one.
  6. Probe the sensor signal with an oscilloscope while wheel is rotated or during a drive-by test: verify waveform shape, amplitude and frequency. For hall sensors expect square pulses; for VR expect AC sine wave.
  7. Perform a wiggle test on wiring/connectors while monitoring live data or oscilloscope for intermittent changes. Repair or replace any broken wiring or corroded connectors found.
  8. If sensor and wiring test good, check module grounds and communication lines (CAN). Verify communication integrity with a scan tool.
  9. If wiring and sensors pass tests, consider module fault. Consult service manual for module bench tests, reprogramming or replacement procedures.
  10. After repair, clear codes, perform a test drive and re-scan to ensure C1743 does not return and related systems function normally.

Likely causes

  • Corroded or disconnected sensor connector at VSS or wheel sensor
  • Broken wire in harness where it flexes (frame, wheel well, steering column)
  • Contaminated or damaged reluctor ring on axle/hub
  • Failed hall‑effect or variable reluctor sensor
  • Blown fuse or poor battery/ground connection feeding the sensor/module
  • Faulty ABS/ESC control module or lost CAN messages

Fault status

⚠️ Status
Indicates the ABS/traction control module detected an invalid, missing or implausible vehicle speed signal. May illuminate ABS/TCS warning and disable related functions until resolved.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

P0500 P0720 C0035 C0040 C0100
320

Browse 320 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.
Send to email
Code

C1743

Other C — Chassis

Rear Sounder Circuit Short to Vbatt

Brand: Other
Type: C — Chassis
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or shorted speed-sensor wiring or connector
  • Faulty vehicle speed sensor (VSS) or wheel speed sensor
  • Damaged reluctor (tone) ring or missing teeth
  • Poor ground or power supply to sensor or control module
  • Faulty ABS/ESC/BCM/PCM module or internal software error
  • Intermittent CAN/data-bus or communication fault

Symptoms

  • ABS, Traction Control or Stability Control warning light illuminated
  • Cruise control inoperative or disabled
  • Speedometer may be erratic or not working (if speed signal used by instrument cluster)
  • Traction/ABS interventions may be incorrect or disabled
  • Possible limp mode or transmission shifting irregularities (if PCM uses same speed input)

What to check

  • Retrieve freeze frame and full scan-tool data — note when and what modules set C1743
  • Check for other stored codes (P0500, P0720, C0035, etc.) that indicate related faults
  • Inspect sensor connectors and wiring for damage, corrosion, or looseness
  • Verify fuses and power/ground circuits for ABS/ESC and speed sensors
  • Monitor vehicle speed signal(s) with a scan tool while driving or spinning wheels
  • If available, use an oscilloscope to view sensor waveform at connector

Signal parameters

  • Hall-effect sensors: 0–5 V digital square wave referenced to vehicle speed (duty/frequency increases with speed)
  • Variable reluctor sensors: low-voltage AC sine wave; amplitude and frequency increase with speed (typically mV–V depending on speed)
  • Expected no-load frequency/voltage varies by vehicle and wheel; compare left/right or known-good reference
  • Good sensor ground and reference supply (often 5 V or battery depending on sensor type) required for valid signal
  • Typical pulses per wheel/revolution depend on reluctor design (commonly 4–48 teeth)

Diagnostic algorithm

  1. Use a capable scan tool to read all ABS/traction/stability and powertrain modules. Record freeze-frame and live vehicle speed values from multiple modules (ABS, PCM, cluster).
  2. Confirm whether the fault is for wheel sensor(s) or vehicle speed sensor: compare speed reported by each wheel sensor and PCM. Look for mismatch or no reading.
  3. Visually inspect the suspect sensor(s), reluctor ring, and harness for damage, debris, missing teeth, or metal contamination.
  4. Check connectors for corrosion, bent pins, water ingress. Disconnect and inspect terminals; clean and apply correct dielectric where specified.
  5. Verify power and ground at sensor connector (with key on) using a DMM. Confirm reference voltage if sensor requires one.
  6. Probe the sensor signal with an oscilloscope while wheel is rotated or during a drive-by test: verify waveform shape, amplitude and frequency. For hall sensors expect square pulses; for VR expect AC sine wave.
  7. Perform a wiggle test on wiring/connectors while monitoring live data or oscilloscope for intermittent changes. Repair or replace any broken wiring or corroded connectors found.
  8. If sensor and wiring test good, check module grounds and communication lines (CAN). Verify communication integrity with a scan tool.
  9. If wiring and sensors pass tests, consider module fault. Consult service manual for module bench tests, reprogramming or replacement procedures.
  10. After repair, clear codes, perform a test drive and re-scan to ensure C1743 does not return and related systems function normally.

Likely causes

  • Corroded or disconnected sensor connector at VSS or wheel sensor
  • Broken wire in harness where it flexes (frame, wheel well, steering column)
  • Contaminated or damaged reluctor ring on axle/hub
  • Failed hall‑effect or variable reluctor sensor
  • Blown fuse or poor battery/ground connection feeding the sensor/module
  • Faulty ABS/ESC control module or lost CAN messages

Fault status

⚠️ Status
Indicates the ABS/traction control module detected an invalid, missing or implausible vehicle speed signal. May illuminate ABS/TCS warning and disable related functions until resolved.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

P0500 P0720 C0035 C0040 C0100
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