Code
P0718
Generic
P — Powertrain
Input/Turbine Shaft Speed Sensor A Circuit Intermittent
Views:
UK: 20
EN: 23
RU: 26
AI status
Completed
Completed
100%
Causes
- Damaged or corroded connector at the ITS sensor
- Broken, chafed, pinched or shorted wiring in the ITS circuit
- Intermittent internal sensor failure
- Poor ground or reference voltage to the sensor
- Intermittent ECU/TCM/PCM input or connector problem
- Contaminated or mechanically damaged sensor or tone wheel
Symptoms
- Check Engine Light (CEL)/Malfunction Indicator Lamp (MIL) illumination
- Intermittent transmission shifting problems (harsh, delayed, slipping)
- Erratic speedometer or drivetrain-related warning messages (if vehicle uses ITS for speed)
- Stalling or difficult to start in some cases (if module uses input speed for control)
- Intermittent limp-home mode of transmission
What to check
- Retrieve freeze frame and live data with a scan tool; note when the code set and what other codes exist
- Monitor ITS sensor live data (and compare to Vehicle Speed Sensor/Output Shaft Speed) for dropouts or mismatching signals
- Perform a visual inspection of the harness and sensor connector for corrosion, water intrusion, broken wires, or pin damage
- Wiggle test harness/connectors while monitoring live data to try to reproduce the intermittent
- Backprobe the sensor connector to measure reference voltage, ground, and signal with a multimeter or oscilloscope
- Measure sensor resistance/continuity (if applicable) and check for short to ground or battery
Signal parameters
- Hall-effect type: digital square wave, 0–5 V (logic switching) with frequency proportional to shaft speed; 50% approximate duty cycle
- Variable-reluctance (VR) type: AC sine/alternating waveform, amplitude increases with shaft speed (typical idle voltage small, increases with rpm)
- Signal frequency should increase smoothly with shaft speed without dropouts or erratic pulses
- Reference supply: many Hall sensors require a stable 5 V reference and a good ground; verify reference is present with key ON
- Noisy or missing waveform, intermittent loss of signal, or erratic amplitude are symptomatic of the fault
Diagnostic algorithm
- Connect a scan tool, read codes and freeze frame, then clear codes and attempt to re-create the fault by driving or operating the transmission under various conditions.
- Monitor ITS sensor live data and compare to VSS/OSS or engine RPM; note any intermittent signal loss or disagreement between sensors.
- Visually inspect the ITS sensor connector and harness from the sensor back to the module for damage, corrosion, or water intrusion. Repair any obvious wiring damage.
- With key ON (engine off) backprobe the sensor connector: verify 5 V reference (if Hall type), good ground, and signal present. If reference or ground intermittent, trace to their source and repair.
- With an oscilloscope (preferred) or DVOM (less ideal), observe the ITS signal while cranking and during road test. Look for clean square wave (Hall) or clean AC waveform (VR) that changes smoothly with speed. Note any dropouts or noise spikes.
- Wiggle test the harness and connectors while monitoring the live signal/oscilloscope to try to reproduce intermittent behaviour. Repair or replace wiring/connectors where intermittent is found.
- Measure sensor coil resistance (if VR type) and check for short to ground or battery. Compare to manufacturer specification if available. Replace sensor if out of spec or intermittent.
- Inspect reluctor/tone wheel and sensor mounting for damage, missing teeth, excessive air gap, or debris. Correct mechanical issues (clean, adjust gap, or replace tone wheel/sensor).
- If sensor and wiring check good, inspect PCM/TCM connector pins and grounds; repair any looseness or corrosion. If intermittent input at module persists, consider module input fault — consult manufacturer service information before replacement.
- After repairs, clear codes and perform functional test/road test to confirm absence of intermittent P0718 and verify proper transmission operation.
Likely causes
- Wiring harness damage (chafe, rodent bite, broken flex point)
- Loose or corroded connector at the sensor or module
- Failed ITS sensor (intermittent internal electronics)
- Intermittent connector/ECU pin issue
- Contaminated sensor face or damaged reluctor/tone wheel
Fault status
Status
Intermittent Input/Turbine Shaft Speed Sensor A circuit — signal is dropping out or noisy. Inspect sensor, wiring, connectors, and module inputs.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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Code
P0718
GWM
P — Powertrain
- Malfunction of the turbine speed sensor
Views:
UK: 2
EN: 5
RU: 6
AI status
Completed
Completed
100%
Causes
- Damaged or corroded connector at the ITS sensor
- Broken, chafed, pinched or shorted wiring in the ITS circuit
- Intermittent internal sensor failure
- Poor ground or reference voltage to the sensor
- Intermittent ECU/TCM/PCM input or connector problem
- Contaminated or mechanically damaged sensor or tone wheel
Symptoms
- Check Engine Light (CEL)/Malfunction Indicator Lamp (MIL) illumination
- Intermittent transmission shifting problems (harsh, delayed, slipping)
- Erratic speedometer or drivetrain-related warning messages (if vehicle uses ITS for speed)
- Stalling or difficult to start in some cases (if module uses input speed for control)
- Intermittent limp-home mode of transmission
What to check
- Retrieve freeze frame and live data with a scan tool; note when the code set and what other codes exist
- Monitor ITS sensor live data (and compare to Vehicle Speed Sensor/Output Shaft Speed) for dropouts or mismatching signals
- Perform a visual inspection of the harness and sensor connector for corrosion, water intrusion, broken wires, or pin damage
- Wiggle test harness/connectors while monitoring live data to try to reproduce the intermittent
- Backprobe the sensor connector to measure reference voltage, ground, and signal with a multimeter or oscilloscope
- Measure sensor resistance/continuity (if applicable) and check for short to ground or battery
Signal parameters
- Hall-effect type: digital square wave, 0–5 V (logic switching) with frequency proportional to shaft speed; 50% approximate duty cycle
- Variable-reluctance (VR) type: AC sine/alternating waveform, amplitude increases with shaft speed (typical idle voltage small, increases with rpm)
- Signal frequency should increase smoothly with shaft speed without dropouts or erratic pulses
- Reference supply: many Hall sensors require a stable 5 V reference and a good ground; verify reference is present with key ON
- Noisy or missing waveform, intermittent loss of signal, or erratic amplitude are symptomatic of the fault
Diagnostic algorithm
- Connect a scan tool, read codes and freeze frame, then clear codes and attempt to re-create the fault by driving or operating the transmission under various conditions.
- Monitor ITS sensor live data and compare to VSS/OSS or engine RPM; note any intermittent signal loss or disagreement between sensors.
- Visually inspect the ITS sensor connector and harness from the sensor back to the module for damage, corrosion, or water intrusion. Repair any obvious wiring damage.
- With key ON (engine off) backprobe the sensor connector: verify 5 V reference (if Hall type), good ground, and signal present. If reference or ground intermittent, trace to their source and repair.
- With an oscilloscope (preferred) or DVOM (less ideal), observe the ITS signal while cranking and during road test. Look for clean square wave (Hall) or clean AC waveform (VR) that changes smoothly with speed. Note any dropouts or noise spikes.
- Wiggle test the harness and connectors while monitoring the live signal/oscilloscope to try to reproduce intermittent behaviour. Repair or replace wiring/connectors where intermittent is found.
- Measure sensor coil resistance (if VR type) and check for short to ground or battery. Compare to manufacturer specification if available. Replace sensor if out of spec or intermittent.
- Inspect reluctor/tone wheel and sensor mounting for damage, missing teeth, excessive air gap, or debris. Correct mechanical issues (clean, adjust gap, or replace tone wheel/sensor).
- If sensor and wiring check good, inspect PCM/TCM connector pins and grounds; repair any looseness or corrosion. If intermittent input at module persists, consider module input fault — consult manufacturer service information before replacement.
- After repairs, clear codes and perform functional test/road test to confirm absence of intermittent P0718 and verify proper transmission operation.
Likely causes
- Wiring harness damage (chafe, rodent bite, broken flex point)
- Loose or corroded connector at the sensor or module
- Failed ITS sensor (intermittent internal electronics)
- Intermittent connector/ECU pin issue
- Contaminated sensor face or damaged reluctor/tone wheel
Fault status
Status
Intermittent Input/Turbine Shaft Speed Sensor A circuit — signal is dropping out or noisy. Inspect sensor, wiring, connectors, and module inputs.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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Code
P0718
HUMMER
P — Powertrain
Input/Turbine Speed Sensor Circuit Intermittent
Views:
UK: 12
EN: 18
RU: 13
AI status
Completed
Completed
100%
Causes
- Damaged or corroded connector at the ITS sensor
- Broken, chafed, pinched or shorted wiring in the ITS circuit
- Intermittent internal sensor failure
- Poor ground or reference voltage to the sensor
- Intermittent ECU/TCM/PCM input or connector problem
- Contaminated or mechanically damaged sensor or tone wheel
Symptoms
- Check Engine Light (CEL)/Malfunction Indicator Lamp (MIL) illumination
- Intermittent transmission shifting problems (harsh, delayed, slipping)
- Erratic speedometer or drivetrain-related warning messages (if vehicle uses ITS for speed)
- Stalling or difficult to start in some cases (if module uses input speed for control)
- Intermittent limp-home mode of transmission
What to check
- Retrieve freeze frame and live data with a scan tool; note when the code set and what other codes exist
- Monitor ITS sensor live data (and compare to Vehicle Speed Sensor/Output Shaft Speed) for dropouts or mismatching signals
- Perform a visual inspection of the harness and sensor connector for corrosion, water intrusion, broken wires, or pin damage
- Wiggle test harness/connectors while monitoring live data to try to reproduce the intermittent
- Backprobe the sensor connector to measure reference voltage, ground, and signal with a multimeter or oscilloscope
- Measure sensor resistance/continuity (if applicable) and check for short to ground or battery
Signal parameters
- Hall-effect type: digital square wave, 0–5 V (logic switching) with frequency proportional to shaft speed; 50% approximate duty cycle
- Variable-reluctance (VR) type: AC sine/alternating waveform, amplitude increases with shaft speed (typical idle voltage small, increases with rpm)
- Signal frequency should increase smoothly with shaft speed without dropouts or erratic pulses
- Reference supply: many Hall sensors require a stable 5 V reference and a good ground; verify reference is present with key ON
- Noisy or missing waveform, intermittent loss of signal, or erratic amplitude are symptomatic of the fault
Diagnostic algorithm
- Connect a scan tool, read codes and freeze frame, then clear codes and attempt to re-create the fault by driving or operating the transmission under various conditions.
- Monitor ITS sensor live data and compare to VSS/OSS or engine RPM; note any intermittent signal loss or disagreement between sensors.
- Visually inspect the ITS sensor connector and harness from the sensor back to the module for damage, corrosion, or water intrusion. Repair any obvious wiring damage.
- With key ON (engine off) backprobe the sensor connector: verify 5 V reference (if Hall type), good ground, and signal present. If reference or ground intermittent, trace to their source and repair.
- With an oscilloscope (preferred) or DVOM (less ideal), observe the ITS signal while cranking and during road test. Look for clean square wave (Hall) or clean AC waveform (VR) that changes smoothly with speed. Note any dropouts or noise spikes.
- Wiggle test the harness and connectors while monitoring the live signal/oscilloscope to try to reproduce intermittent behaviour. Repair or replace wiring/connectors where intermittent is found.
- Measure sensor coil resistance (if VR type) and check for short to ground or battery. Compare to manufacturer specification if available. Replace sensor if out of spec or intermittent.
- Inspect reluctor/tone wheel and sensor mounting for damage, missing teeth, excessive air gap, or debris. Correct mechanical issues (clean, adjust gap, or replace tone wheel/sensor).
- If sensor and wiring check good, inspect PCM/TCM connector pins and grounds; repair any looseness or corrosion. If intermittent input at module persists, consider module input fault — consult manufacturer service information before replacement.
- After repairs, clear codes and perform functional test/road test to confirm absence of intermittent P0718 and verify proper transmission operation.
Likely causes
- Wiring harness damage (chafe, rodent bite, broken flex point)
- Loose or corroded connector at the sensor or module
- Failed ITS sensor (intermittent internal electronics)
- Intermittent connector/ECU pin issue
- Contaminated sensor face or damaged reluctor/tone wheel
Fault status
Status
Intermittent Input/Turbine Shaft Speed Sensor A circuit — signal is dropping out or noisy. Inspect sensor, wiring, connectors, and module inputs.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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Code
P0718
LAND ROVER
P — Powertrain
Intermittent circuit of the turbine speed sensor
Views:
UK: 6
EN: 9
RU: 10
AI status
Completed
Completed
100%
Causes
- Damaged or corroded connector at the ITS sensor
- Broken, chafed, pinched or shorted wiring in the ITS circuit
- Intermittent internal sensor failure
- Poor ground or reference voltage to the sensor
- Intermittent ECU/TCM/PCM input or connector problem
- Contaminated or mechanically damaged sensor or tone wheel
Symptoms
- Check Engine Light (CEL)/Malfunction Indicator Lamp (MIL) illumination
- Intermittent transmission shifting problems (harsh, delayed, slipping)
- Erratic speedometer or drivetrain-related warning messages (if vehicle uses ITS for speed)
- Stalling or difficult to start in some cases (if module uses input speed for control)
- Intermittent limp-home mode of transmission
What to check
- Retrieve freeze frame and live data with a scan tool; note when the code set and what other codes exist
- Monitor ITS sensor live data (and compare to Vehicle Speed Sensor/Output Shaft Speed) for dropouts or mismatching signals
- Perform a visual inspection of the harness and sensor connector for corrosion, water intrusion, broken wires, or pin damage
- Wiggle test harness/connectors while monitoring live data to try to reproduce the intermittent
- Backprobe the sensor connector to measure reference voltage, ground, and signal with a multimeter or oscilloscope
- Measure sensor resistance/continuity (if applicable) and check for short to ground or battery
Signal parameters
- Hall-effect type: digital square wave, 0–5 V (logic switching) with frequency proportional to shaft speed; 50% approximate duty cycle
- Variable-reluctance (VR) type: AC sine/alternating waveform, amplitude increases with shaft speed (typical idle voltage small, increases with rpm)
- Signal frequency should increase smoothly with shaft speed without dropouts or erratic pulses
- Reference supply: many Hall sensors require a stable 5 V reference and a good ground; verify reference is present with key ON
- Noisy or missing waveform, intermittent loss of signal, or erratic amplitude are symptomatic of the fault
Diagnostic algorithm
- Connect a scan tool, read codes and freeze frame, then clear codes and attempt to re-create the fault by driving or operating the transmission under various conditions.
- Monitor ITS sensor live data and compare to VSS/OSS or engine RPM; note any intermittent signal loss or disagreement between sensors.
- Visually inspect the ITS sensor connector and harness from the sensor back to the module for damage, corrosion, or water intrusion. Repair any obvious wiring damage.
- With key ON (engine off) backprobe the sensor connector: verify 5 V reference (if Hall type), good ground, and signal present. If reference or ground intermittent, trace to their source and repair.
- With an oscilloscope (preferred) or DVOM (less ideal), observe the ITS signal while cranking and during road test. Look for clean square wave (Hall) or clean AC waveform (VR) that changes smoothly with speed. Note any dropouts or noise spikes.
- Wiggle test the harness and connectors while monitoring the live signal/oscilloscope to try to reproduce intermittent behaviour. Repair or replace wiring/connectors where intermittent is found.
- Measure sensor coil resistance (if VR type) and check for short to ground or battery. Compare to manufacturer specification if available. Replace sensor if out of spec or intermittent.
- Inspect reluctor/tone wheel and sensor mounting for damage, missing teeth, excessive air gap, or debris. Correct mechanical issues (clean, adjust gap, or replace tone wheel/sensor).
- If sensor and wiring check good, inspect PCM/TCM connector pins and grounds; repair any looseness or corrosion. If intermittent input at module persists, consider module input fault — consult manufacturer service information before replacement.
- After repairs, clear codes and perform functional test/road test to confirm absence of intermittent P0718 and verify proper transmission operation.
Likely causes
- Wiring harness damage (chafe, rodent bite, broken flex point)
- Loose or corroded connector at the sensor or module
- Failed ITS sensor (intermittent internal electronics)
- Intermittent connector/ECU pin issue
- Contaminated sensor face or damaged reluctor/tone wheel
Fault status
Status
Intermittent Input/Turbine Shaft Speed Sensor A circuit — signal is dropping out or noisy. Inspect sensor, wiring, connectors, and module inputs.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Workshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualLand Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualLand Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop ManualYour experience will help others
+100 karma for a short comment :)
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Code
P0718
MERCEDES-BENZ
P — Powertrain
Input/Turbine Speed Sensor Circuit Intermittent
Views:
UK: 15
EN: 13
RU: 21
AI status
Completed
Completed
100%
Causes
- Damaged or corroded connector at the ITS sensor
- Broken, chafed, pinched or shorted wiring in the ITS circuit
- Intermittent internal sensor failure
- Poor ground or reference voltage to the sensor
- Intermittent ECU/TCM/PCM input or connector problem
- Contaminated or mechanically damaged sensor or tone wheel
Symptoms
- Check Engine Light (CEL)/Malfunction Indicator Lamp (MIL) illumination
- Intermittent transmission shifting problems (harsh, delayed, slipping)
- Erratic speedometer or drivetrain-related warning messages (if vehicle uses ITS for speed)
- Stalling or difficult to start in some cases (if module uses input speed for control)
- Intermittent limp-home mode of transmission
What to check
- Retrieve freeze frame and live data with a scan tool; note when the code set and what other codes exist
- Monitor ITS sensor live data (and compare to Vehicle Speed Sensor/Output Shaft Speed) for dropouts or mismatching signals
- Perform a visual inspection of the harness and sensor connector for corrosion, water intrusion, broken wires, or pin damage
- Wiggle test harness/connectors while monitoring live data to try to reproduce the intermittent
- Backprobe the sensor connector to measure reference voltage, ground, and signal with a multimeter or oscilloscope
- Measure sensor resistance/continuity (if applicable) and check for short to ground or battery
Signal parameters
- Hall-effect type: digital square wave, 0–5 V (logic switching) with frequency proportional to shaft speed; 50% approximate duty cycle
- Variable-reluctance (VR) type: AC sine/alternating waveform, amplitude increases with shaft speed (typical idle voltage small, increases with rpm)
- Signal frequency should increase smoothly with shaft speed without dropouts or erratic pulses
- Reference supply: many Hall sensors require a stable 5 V reference and a good ground; verify reference is present with key ON
- Noisy or missing waveform, intermittent loss of signal, or erratic amplitude are symptomatic of the fault
Diagnostic algorithm
- Connect a scan tool, read codes and freeze frame, then clear codes and attempt to re-create the fault by driving or operating the transmission under various conditions.
- Monitor ITS sensor live data and compare to VSS/OSS or engine RPM; note any intermittent signal loss or disagreement between sensors.
- Visually inspect the ITS sensor connector and harness from the sensor back to the module for damage, corrosion, or water intrusion. Repair any obvious wiring damage.
- With key ON (engine off) backprobe the sensor connector: verify 5 V reference (if Hall type), good ground, and signal present. If reference or ground intermittent, trace to their source and repair.
- With an oscilloscope (preferred) or DVOM (less ideal), observe the ITS signal while cranking and during road test. Look for clean square wave (Hall) or clean AC waveform (VR) that changes smoothly with speed. Note any dropouts or noise spikes.
- Wiggle test the harness and connectors while monitoring the live signal/oscilloscope to try to reproduce intermittent behaviour. Repair or replace wiring/connectors where intermittent is found.
- Measure sensor coil resistance (if VR type) and check for short to ground or battery. Compare to manufacturer specification if available. Replace sensor if out of spec or intermittent.
- Inspect reluctor/tone wheel and sensor mounting for damage, missing teeth, excessive air gap, or debris. Correct mechanical issues (clean, adjust gap, or replace tone wheel/sensor).
- If sensor and wiring check good, inspect PCM/TCM connector pins and grounds; repair any looseness or corrosion. If intermittent input at module persists, consider module input fault — consult manufacturer service information before replacement.
- After repairs, clear codes and perform functional test/road test to confirm absence of intermittent P0718 and verify proper transmission operation.
Likely causes
- Wiring harness damage (chafe, rodent bite, broken flex point)
- Loose or corroded connector at the sensor or module
- Failed ITS sensor (intermittent internal electronics)
- Intermittent connector/ECU pin issue
- Contaminated sensor face or damaged reluctor/tone wheel
Fault status
Status
Intermittent Input/Turbine Shaft Speed Sensor A circuit — signal is dropping out or noisy. Inspect sensor, wiring, connectors, and module inputs.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
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