Code
C1445
LAND ROVER
C — Chassis
Failure in the vehicle speed signal circuit
Views:
UK: 4
EN: 9
RU: 5
AI status
Completed
Completed
100%
Causes
- Faulty vehicle speed sensor (VSS) or wheel speed sensor
- Damaged/shorted/open wiring or corroded connectors in the VSS circuit
- Poor or missing ground or reference voltage to the sensor
- Damaged tone wheel/reluctor ring or missing magnetic teeth
- Contaminated or physically damaged sensor (debris, metal shavings)
- Intermittent connector contact (corrosion, bent pins, water ingress)
Symptoms
- Malfunction Indicator Lamp (MIL) or ABS/TC warning lamp illuminated
- Speedometer or odometer reading erratic, frozen or zero
- Cruise control disabled or unavailable
- Transmission shifting abnormally or going into limp mode
- Traction/stability control functions limited or disabled
- Inconsistent or jumping vehicle speed displayed
What to check
- Read stored and pending DTCs with a factory-level or OEM-capable scan tool; record freeze-frame and live data
- Clear codes then re-scan after a road test to reproduce
- Visually inspect VSS, tone wheel/reluctor ring, axle/hub and connectors for damage, corrosion or debris
- Backprobe sensor connector and read live speed signal while spinning wheel or driving (with safe road test)
- Verify sensor supply voltage and ground at the connector with key ON and during operation
- Check continuity and resistance of the harness between sensor and control module; wiggle harness to check intermittent faults
Signal parameters
- Sensor output: pulsed signal whose frequency increases with vehicle/wheel speed (type depends on sensor: Hall-effect = square wave, variable reluctance = AC sine wave)
- At rest: no pulses (0 Hz). As vehicle/wheel rotates the frequency rises proportionally to speed
- Typical signal amplitude depends on sensor type—refer to vehicle service manual for exact V, waveform and frequency specs
- Open circuit presents as no signal; short to ground or battery can produce constant/incorrect voltage or no pulses
- Compare live-data speed value from ABS/PCM with actual vehicle speed to detect mismatches
Diagnostic algorithm
- Retrieve all related DTCs from ABS, PCM and transmission control modules; note freeze‑frame data.
- Confirm symptom: road test (safely) or spin hub and observe live speed signal/pulse count on scan tool or oscilloscope.
- Visually inspect sensor, tone wheel and connector for damage, missing teeth, metal debris or contamination; clean or repair as needed.
- With ignition ON (engine off), backprobe sensor harness and verify reference voltage/power and ground presence per service manual.
- Measure sensor output while rotating hub/wheel (or spin sensor) with a multimeter/oscilloscope; verify waveform type and frequency change with speed.
- If no signal or incorrect signal, check harness continuity to control module and inspect connectors/pins for corrosion or damage; repair harness as needed.
- If wiring and power/ground are good but signal is bad, replace the sensor and re-test.
- If replaced sensor does not restore valid signal, test/replace or reprogram ABS/PCM/TCM as directed by factory diagnostics; verify module communications and check fuses/relays.
- Clear codes and perform verification road test; confirm no reoccurrence and proper operation of speedometer, cruise, ABS/TC functions.
Likely causes
- Open circuit or short in the sensor harness between sensor and ABS/PCM
- Corroded or loose connector at sensor or at control module
- Physically damaged tone wheel on hub/axle causing no pulses
- Failed VSS (hall or magnetic element)
- Intermittent ground or reference voltage loss
Fault status
Status
C1445 — Vehicle speed signal circuit failure: VSS signal missing, implausible or intermittent. May disable speed-dependent systems (speedometer, ABS/TC, cruise, transmission).
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
C1445
Other
C — Chassis
Speed Vehicle Signal Circuit Failure
Views:
UK: 16
EN: 21
RU: 11
AI status
Completed
Completed
100%
Causes
- Faulty vehicle speed sensor (VSS) or wheel speed sensor
- Damaged/shorted/open wiring or corroded connectors in the VSS circuit
- Poor or missing ground or reference voltage to the sensor
- Damaged tone wheel/reluctor ring or missing magnetic teeth
- Contaminated or physically damaged sensor (debris, metal shavings)
- Intermittent connector contact (corrosion, bent pins, water ingress)
Symptoms
- Malfunction Indicator Lamp (MIL) or ABS/TC warning lamp illuminated
- Speedometer or odometer reading erratic, frozen or zero
- Cruise control disabled or unavailable
- Transmission shifting abnormally or going into limp mode
- Traction/stability control functions limited or disabled
- Inconsistent or jumping vehicle speed displayed
What to check
- Read stored and pending DTCs with a factory-level or OEM-capable scan tool; record freeze-frame and live data
- Clear codes then re-scan after a road test to reproduce
- Visually inspect VSS, tone wheel/reluctor ring, axle/hub and connectors for damage, corrosion or debris
- Backprobe sensor connector and read live speed signal while spinning wheel or driving (with safe road test)
- Verify sensor supply voltage and ground at the connector with key ON and during operation
- Check continuity and resistance of the harness between sensor and control module; wiggle harness to check intermittent faults
Signal parameters
- Sensor output: pulsed signal whose frequency increases with vehicle/wheel speed (type depends on sensor: Hall-effect = square wave, variable reluctance = AC sine wave)
- At rest: no pulses (0 Hz). As vehicle/wheel rotates the frequency rises proportionally to speed
- Typical signal amplitude depends on sensor type—refer to vehicle service manual for exact V, waveform and frequency specs
- Open circuit presents as no signal; short to ground or battery can produce constant/incorrect voltage or no pulses
- Compare live-data speed value from ABS/PCM with actual vehicle speed to detect mismatches
Diagnostic algorithm
- Retrieve all related DTCs from ABS, PCM and transmission control modules; note freeze‑frame data.
- Confirm symptom: road test (safely) or spin hub and observe live speed signal/pulse count on scan tool or oscilloscope.
- Visually inspect sensor, tone wheel and connector for damage, missing teeth, metal debris or contamination; clean or repair as needed.
- With ignition ON (engine off), backprobe sensor harness and verify reference voltage/power and ground presence per service manual.
- Measure sensor output while rotating hub/wheel (or spin sensor) with a multimeter/oscilloscope; verify waveform type and frequency change with speed.
- If no signal or incorrect signal, check harness continuity to control module and inspect connectors/pins for corrosion or damage; repair harness as needed.
- If wiring and power/ground are good but signal is bad, replace the sensor and re-test.
- If replaced sensor does not restore valid signal, test/replace or reprogram ABS/PCM/TCM as directed by factory diagnostics; verify module communications and check fuses/relays.
- Clear codes and perform verification road test; confirm no reoccurrence and proper operation of speedometer, cruise, ABS/TC functions.
Likely causes
- Open circuit or short in the sensor harness between sensor and ABS/PCM
- Corroded or loose connector at sensor or at control module
- Physically damaged tone wheel on hub/axle causing no pulses
- Failed VSS (hall or magnetic element)
- Intermittent ground or reference voltage loss
Fault status
Status
C1445 — Vehicle speed signal circuit failure: VSS signal missing, implausible or intermittent. May disable speed-dependent systems (speedometer, ABS/TC, cruise, transmission).
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
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👎 Dislike
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Send to email