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Home / DTC / P0726 — Engine Speed Input Circuit Range/Performance

P0726 — Engine Speed Input Circuit Range/Performance

Detailed page for trouble code P0726.

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Code

P0726

Generic P — Powertrain

Engine Speed Input Circuit Range/Performance

Brand: Generic
Type: P — Powertrain
Views: UK: 30 EN: 62 RU: 64
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or failed engine speed (RPM) sensor (crankshaft or primary speed sensor)
  • Broken, shorted, corroded or disconnected wiring or connector in the sensor circuit
  • Poor or intermittent reference power or ground to the sensor
  • Intermittent or corrupted signal caused by electrical interference
  • Faulty ECM or poor ECM input connection
  • Related component failures causing incorrect engine speed reading (e.g., timing component damage)

Symptoms

  • Check Engine Light (MIL) illuminated
  • Inaccurate or fluctuating RPM reading on scan tool or tachometer
  • Stalling, rough idle, or hesitation during acceleration if the engine speed signal is lost
  • Starter/crank-related driveability problems if the ECM cannot determine engine speed
  • Possible limp-home mode or reduced performance depending on vehicle

What to check

  • Retrieve freeze frame and stored data with a scan tool; note engine conditions when the code set
  • Check for other related DTCs (crankshaft/cam sensor codes, CAN bus or power/ground faults)
  • Visually inspect sensor, wiring, and connectors for damage, corrosion, or loose pins
  • Backprobe sensor connector and verify reference voltage, signal, and ground with a multimeter or oscilloscope
  • Compare scan tool RPM reading to tachometer and observe for dropouts or erratic readings
  • Measure sensor resistance if specified by service data, and check for short to ground or battery

Signal parameters

  • Reference voltage commonly 5 V (hall-effect sensors) — verify with service data
  • Signal type: square wave (hall) or AC sinusoidal (inductive) depending on sensor
  • Typical signal amplitude: 0–5 V for Hall sensors; AC amplitude varies with speed for inductive sensors
  • Frequency proportional to engine RPM; RPM vs signal frequency should be linear and consistent
  • Sensor resistance and air gap specifications are manufacturer-specific — consult repair manual

Diagnostic algorithm

  1. Read and record all DTCs, freeze frame, and live data (engine speed, related sensors).
  2. Check for related codes (crankshaft/camshaft position codes such as P0335/P0336) to narrow scope.
  3. Visually inspect sensor and wiring harness from sensor to ECM for damage, corrosion, or loose connections.
  4. With ignition ON (engine off), verify reference voltage and ground at the sensor connector; compare to spec.
  5. Start engine (if safe) and observe signal at the connector with a scope or multimeter: look for consistent waveform and amplitude; note any dropouts or noise.
  6. If waveform abnormal or absent, measure sensor resistance (if specified) and check for short to ground or battery.
  7. Wiggle test wiring and connectors while monitoring signal to find intermittent failures.
  8. If wiring and connector checks good but signal still faulty, replace sensor with known-good unit and retest.
  9. If new sensor does not restore correct signal, check continuity from sensor connector to ECM pin and verify ECM ground and inputs.
  10. If wiring and ECM inputs test correct and problem persists, consult manufacturer diagnostics — consider ECM replacement or bench testing.

Likely causes

  • Wiring harness damage at common failure points (heat, vibration, chafing)
  • Contaminated or corroded sensor connector pins
  • Failed hall-effect or inductive speed sensor
  • Poor ground at engine block or sensor ground
  • Intermittent connector due to compound or bent pin

Fault status

⚠️ Status
Engine Speed Input Circuit Range/Performance — ECM detected engine speed (RPM) input outside expected range or exhibiting poor performance. Check sensor, wiring, and ECM input.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

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Code

P0726

GWM P — Powertrain

- Invalid indicator / engine speed sensor not adjusted

Brand: GWM
Type: P — Powertrain
Views: UK: 12 EN: 25 RU: 31
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or failed engine speed (RPM) sensor (crankshaft or primary speed sensor)
  • Broken, shorted, corroded or disconnected wiring or connector in the sensor circuit
  • Poor or intermittent reference power or ground to the sensor
  • Intermittent or corrupted signal caused by electrical interference
  • Faulty ECM or poor ECM input connection
  • Related component failures causing incorrect engine speed reading (e.g., timing component damage)

Symptoms

  • Check Engine Light (MIL) illuminated
  • Inaccurate or fluctuating RPM reading on scan tool or tachometer
  • Stalling, rough idle, or hesitation during acceleration if the engine speed signal is lost
  • Starter/crank-related driveability problems if the ECM cannot determine engine speed
  • Possible limp-home mode or reduced performance depending on vehicle

What to check

  • Retrieve freeze frame and stored data with a scan tool; note engine conditions when the code set
  • Check for other related DTCs (crankshaft/cam sensor codes, CAN bus or power/ground faults)
  • Visually inspect sensor, wiring, and connectors for damage, corrosion, or loose pins
  • Backprobe sensor connector and verify reference voltage, signal, and ground with a multimeter or oscilloscope
  • Compare scan tool RPM reading to tachometer and observe for dropouts or erratic readings
  • Measure sensor resistance if specified by service data, and check for short to ground or battery

Signal parameters

  • Reference voltage commonly 5 V (hall-effect sensors) — verify with service data
  • Signal type: square wave (hall) or AC sinusoidal (inductive) depending on sensor
  • Typical signal amplitude: 0–5 V for Hall sensors; AC amplitude varies with speed for inductive sensors
  • Frequency proportional to engine RPM; RPM vs signal frequency should be linear and consistent
  • Sensor resistance and air gap specifications are manufacturer-specific — consult repair manual

Diagnostic algorithm

  1. Read and record all DTCs, freeze frame, and live data (engine speed, related sensors).
  2. Check for related codes (crankshaft/camshaft position codes such as P0335/P0336) to narrow scope.
  3. Visually inspect sensor and wiring harness from sensor to ECM for damage, corrosion, or loose connections.
  4. With ignition ON (engine off), verify reference voltage and ground at the sensor connector; compare to spec.
  5. Start engine (if safe) and observe signal at the connector with a scope or multimeter: look for consistent waveform and amplitude; note any dropouts or noise.
  6. If waveform abnormal or absent, measure sensor resistance (if specified) and check for short to ground or battery.
  7. Wiggle test wiring and connectors while monitoring signal to find intermittent failures.
  8. If wiring and connector checks good but signal still faulty, replace sensor with known-good unit and retest.
  9. If new sensor does not restore correct signal, check continuity from sensor connector to ECM pin and verify ECM ground and inputs.
  10. If wiring and ECM inputs test correct and problem persists, consult manufacturer diagnostics — consider ECM replacement or bench testing.

Likely causes

  • Wiring harness damage at common failure points (heat, vibration, chafing)
  • Contaminated or corroded sensor connector pins
  • Failed hall-effect or inductive speed sensor
  • Poor ground at engine block or sensor ground
  • Intermittent connector due to compound or bent pin

Fault status

⚠️ Status
Engine Speed Input Circuit Range/Performance — ECM detected engine speed (RPM) input outside expected range or exhibiting poor performance. Check sensor, wiring, and ECM input.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

P0725 P0335 P0336 P0720 P0721
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Code

P0726

HUMMER P — Powertrain

Engine Speed Input Circuit Range/Performance

Brand: HUMMER
Type: P — Powertrain
Views: UK: 17 EN: 29 RU: 45
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or failed engine speed (RPM) sensor (crankshaft or primary speed sensor)
  • Broken, shorted, corroded or disconnected wiring or connector in the sensor circuit
  • Poor or intermittent reference power or ground to the sensor
  • Intermittent or corrupted signal caused by electrical interference
  • Faulty ECM or poor ECM input connection
  • Related component failures causing incorrect engine speed reading (e.g., timing component damage)

Symptoms

  • Check Engine Light (MIL) illuminated
  • Inaccurate or fluctuating RPM reading on scan tool or tachometer
  • Stalling, rough idle, or hesitation during acceleration if the engine speed signal is lost
  • Starter/crank-related driveability problems if the ECM cannot determine engine speed
  • Possible limp-home mode or reduced performance depending on vehicle

What to check

  • Retrieve freeze frame and stored data with a scan tool; note engine conditions when the code set
  • Check for other related DTCs (crankshaft/cam sensor codes, CAN bus or power/ground faults)
  • Visually inspect sensor, wiring, and connectors for damage, corrosion, or loose pins
  • Backprobe sensor connector and verify reference voltage, signal, and ground with a multimeter or oscilloscope
  • Compare scan tool RPM reading to tachometer and observe for dropouts or erratic readings
  • Measure sensor resistance if specified by service data, and check for short to ground or battery

Signal parameters

  • Reference voltage commonly 5 V (hall-effect sensors) — verify with service data
  • Signal type: square wave (hall) or AC sinusoidal (inductive) depending on sensor
  • Typical signal amplitude: 0–5 V for Hall sensors; AC amplitude varies with speed for inductive sensors
  • Frequency proportional to engine RPM; RPM vs signal frequency should be linear and consistent
  • Sensor resistance and air gap specifications are manufacturer-specific — consult repair manual

Diagnostic algorithm

  1. Read and record all DTCs, freeze frame, and live data (engine speed, related sensors).
  2. Check for related codes (crankshaft/camshaft position codes such as P0335/P0336) to narrow scope.
  3. Visually inspect sensor and wiring harness from sensor to ECM for damage, corrosion, or loose connections.
  4. With ignition ON (engine off), verify reference voltage and ground at the sensor connector; compare to spec.
  5. Start engine (if safe) and observe signal at the connector with a scope or multimeter: look for consistent waveform and amplitude; note any dropouts or noise.
  6. If waveform abnormal or absent, measure sensor resistance (if specified) and check for short to ground or battery.
  7. Wiggle test wiring and connectors while monitoring signal to find intermittent failures.
  8. If wiring and connector checks good but signal still faulty, replace sensor with known-good unit and retest.
  9. If new sensor does not restore correct signal, check continuity from sensor connector to ECM pin and verify ECM ground and inputs.
  10. If wiring and ECM inputs test correct and problem persists, consult manufacturer diagnostics — consider ECM replacement or bench testing.

Likely causes

  • Wiring harness damage at common failure points (heat, vibration, chafing)
  • Contaminated or corroded sensor connector pins
  • Failed hall-effect or inductive speed sensor
  • Poor ground at engine block or sensor ground
  • Intermittent connector due to compound or bent pin

Fault status

⚠️ Status
Engine Speed Input Circuit Range/Performance — ECM detected engine speed (RPM) input outside expected range or exhibiting poor performance. Check sensor, wiring, and ECM input.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

P0725 P0335 P0336 P0720 P0721
Repair manuals

Manual library for HUMMER

138

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Code

P0726

LAND ROVER P — Powertrain

Input of engine rotation - range / performance of circuit Engine speed input circuit no signal from gear 6

Brand: LAND ROVER
Type: P — Powertrain
Views: UK: 18 EN: 31 RU: 43
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or failed engine speed (RPM) sensor (crankshaft or primary speed sensor)
  • Broken, shorted, corroded or disconnected wiring or connector in the sensor circuit
  • Poor or intermittent reference power or ground to the sensor
  • Intermittent or corrupted signal caused by electrical interference
  • Faulty ECM or poor ECM input connection
  • Related component failures causing incorrect engine speed reading (e.g., timing component damage)

Symptoms

  • Check Engine Light (MIL) illuminated
  • Inaccurate or fluctuating RPM reading on scan tool or tachometer
  • Stalling, rough idle, or hesitation during acceleration if the engine speed signal is lost
  • Starter/crank-related driveability problems if the ECM cannot determine engine speed
  • Possible limp-home mode or reduced performance depending on vehicle

What to check

  • Retrieve freeze frame and stored data with a scan tool; note engine conditions when the code set
  • Check for other related DTCs (crankshaft/cam sensor codes, CAN bus or power/ground faults)
  • Visually inspect sensor, wiring, and connectors for damage, corrosion, or loose pins
  • Backprobe sensor connector and verify reference voltage, signal, and ground with a multimeter or oscilloscope
  • Compare scan tool RPM reading to tachometer and observe for dropouts or erratic readings
  • Measure sensor resistance if specified by service data, and check for short to ground or battery

Signal parameters

  • Reference voltage commonly 5 V (hall-effect sensors) — verify with service data
  • Signal type: square wave (hall) or AC sinusoidal (inductive) depending on sensor
  • Typical signal amplitude: 0–5 V for Hall sensors; AC amplitude varies with speed for inductive sensors
  • Frequency proportional to engine RPM; RPM vs signal frequency should be linear and consistent
  • Sensor resistance and air gap specifications are manufacturer-specific — consult repair manual

Diagnostic algorithm

  1. Read and record all DTCs, freeze frame, and live data (engine speed, related sensors).
  2. Check for related codes (crankshaft/camshaft position codes such as P0335/P0336) to narrow scope.
  3. Visually inspect sensor and wiring harness from sensor to ECM for damage, corrosion, or loose connections.
  4. With ignition ON (engine off), verify reference voltage and ground at the sensor connector; compare to spec.
  5. Start engine (if safe) and observe signal at the connector with a scope or multimeter: look for consistent waveform and amplitude; note any dropouts or noise.
  6. If waveform abnormal or absent, measure sensor resistance (if specified) and check for short to ground or battery.
  7. Wiggle test wiring and connectors while monitoring signal to find intermittent failures.
  8. If wiring and connector checks good but signal still faulty, replace sensor with known-good unit and retest.
  9. If new sensor does not restore correct signal, check continuity from sensor connector to ECM pin and verify ECM ground and inputs.
  10. If wiring and ECM inputs test correct and problem persists, consult manufacturer diagnostics — consider ECM replacement or bench testing.

Likely causes

  • Wiring harness damage at common failure points (heat, vibration, chafing)
  • Contaminated or corroded sensor connector pins
  • Failed hall-effect or inductive speed sensor
  • Poor ground at engine block or sensor ground
  • Intermittent connector due to compound or bent pin

Fault status

⚠️ Status
Engine Speed Input Circuit Range/Performance — ECM detected engine speed (RPM) input outside expected range or exhibiting poor performance. Check sensor, wiring, and ECM input.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

P0725 P0335 P0336 P0720 P0721
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

P0726

MERCEDES-BENZ P — Powertrain

Engine Speed Input Circuit Range/Performance

Brand: MERCEDES-BENZ
Type: P — Powertrain
Views: UK: 30 EN: 35 RU: 56
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or failed engine speed (RPM) sensor (crankshaft or primary speed sensor)
  • Broken, shorted, corroded or disconnected wiring or connector in the sensor circuit
  • Poor or intermittent reference power or ground to the sensor
  • Intermittent or corrupted signal caused by electrical interference
  • Faulty ECM or poor ECM input connection
  • Related component failures causing incorrect engine speed reading (e.g., timing component damage)

Symptoms

  • Check Engine Light (MIL) illuminated
  • Inaccurate or fluctuating RPM reading on scan tool or tachometer
  • Stalling, rough idle, or hesitation during acceleration if the engine speed signal is lost
  • Starter/crank-related driveability problems if the ECM cannot determine engine speed
  • Possible limp-home mode or reduced performance depending on vehicle

What to check

  • Retrieve freeze frame and stored data with a scan tool; note engine conditions when the code set
  • Check for other related DTCs (crankshaft/cam sensor codes, CAN bus or power/ground faults)
  • Visually inspect sensor, wiring, and connectors for damage, corrosion, or loose pins
  • Backprobe sensor connector and verify reference voltage, signal, and ground with a multimeter or oscilloscope
  • Compare scan tool RPM reading to tachometer and observe for dropouts or erratic readings
  • Measure sensor resistance if specified by service data, and check for short to ground or battery

Signal parameters

  • Reference voltage commonly 5 V (hall-effect sensors) — verify with service data
  • Signal type: square wave (hall) or AC sinusoidal (inductive) depending on sensor
  • Typical signal amplitude: 0–5 V for Hall sensors; AC amplitude varies with speed for inductive sensors
  • Frequency proportional to engine RPM; RPM vs signal frequency should be linear and consistent
  • Sensor resistance and air gap specifications are manufacturer-specific — consult repair manual

Diagnostic algorithm

  1. Read and record all DTCs, freeze frame, and live data (engine speed, related sensors).
  2. Check for related codes (crankshaft/camshaft position codes such as P0335/P0336) to narrow scope.
  3. Visually inspect sensor and wiring harness from sensor to ECM for damage, corrosion, or loose connections.
  4. With ignition ON (engine off), verify reference voltage and ground at the sensor connector; compare to spec.
  5. Start engine (if safe) and observe signal at the connector with a scope or multimeter: look for consistent waveform and amplitude; note any dropouts or noise.
  6. If waveform abnormal or absent, measure sensor resistance (if specified) and check for short to ground or battery.
  7. Wiggle test wiring and connectors while monitoring signal to find intermittent failures.
  8. If wiring and connector checks good but signal still faulty, replace sensor with known-good unit and retest.
  9. If new sensor does not restore correct signal, check continuity from sensor connector to ECM pin and verify ECM ground and inputs.
  10. If wiring and ECM inputs test correct and problem persists, consult manufacturer diagnostics — consider ECM replacement or bench testing.

Likely causes

  • Wiring harness damage at common failure points (heat, vibration, chafing)
  • Contaminated or corroded sensor connector pins
  • Failed hall-effect or inductive speed sensor
  • Poor ground at engine block or sensor ground
  • Intermittent connector due to compound or bent pin

Fault status

⚠️ Status
Engine Speed Input Circuit Range/Performance — ECM detected engine speed (RPM) input outside expected range or exhibiting poor performance. Check sensor, wiring, and ECM input.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

P0725 P0335 P0336 P0720 P0721
665

Browse 665 MERCEDES-BENZ manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MERCEDES-BENZ

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

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