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Home / DTC / P0716 — Input/Turbine Speed Sensor Circuit Range/Performance

P0716 — Input/Turbine Speed Sensor Circuit Range/Performance

Detailed page for trouble code P0716.

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Code

P0716

MERCEDES-BENZ P — Powertrain

Input/Turbine Speed Sensor Circuit Range/Performance

Brand: MERCEDES-BENZ
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty input/turbine speed sensor
  • Damaged wiring harness or chafed insulation (open/short to power or ground)
  • Poor or corroded connector terminals
  • Incorrect sensor air gap or sensor installed wrong
  • Contaminated sensor or magnetic debris on sensor tip
  • Low or contaminated transmission fluid affecting sensor or gearbox internals

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Transmission shift abnormalities (harsh, delayed, erratic, or slipping shifts)
  • Transmission may enter limp/safe mode
  • Inconsistent or no turbine/input speed reading in scan tool data
  • Possible reduced fuel economy or drivability issues

What to check

  • Retrieve freeze frame and live data with a capable scan tool; note turbine/input speed and related parameters
  • Visually inspect sensor connector and wiring for damage, corrosion, or loose pins
  • Check transmission fluid level and condition per manufacturer specification
  • Compare turbine/input speed against transmission output speed and vehicle speed on scan tool during road or stall test
  • Backprobe harness to verify reference voltage, ground, and signal with a DMM/oscilloscope
  • Check continuity and resistance of sensor wiring to the control module

Signal parameters

  • Sensor types: variable reluctance (VR) or Hall-effect; confirm type for the vehicle
  • VR sensor: AC sine waveform whose frequency and amplitude increase with shaft speed
  • Hall sensor: digital pulse signal, typically switching between ~0 V and ~5 V (reference depends on vehicle)
  • Typical connector: 2-pin (VR) or 3-pin (Hall: power, ground, signal); verify pinout from OEM data
  • No universal resistance/voltage values — measure and compare to Mercedes-Benz OEM specifications for the specific model

Diagnostic algorithm

  1. Read and record freeze frame and live data. Note conditions when code set (engine/transmission temp, gear, speed).
  2. Attempt to reproduce while monitoring turbine/input speed, output speed, and vehicle speed. Note discrepancies or dropouts.
  3. Visually inspect sensor connector and wiring from sensor to TCM/PCM for damage, corrosion, pin push-out, or chafing.
  4. With ignition on, backprobe connector: verify sensor power (if Hall type), ground, and reference voltage present per OEM; if VR type, proceed to step 5.
  5. Measure signal: VR — check AC voltage or frequency while cranking/rolling; Hall — check square wave 0–Vref with scope or digital meter at idle and while revving. Look for missing pulses, noise, or low amplitude.
  6. Perform continuity and resistance checks between sensor connector and control module pins to rule out opens/shorts. Wiggle harness to check for intermittent faults.
  7. Inspect sensor air gap and mounting; clean or remove metallic debris from sensor tip if present. Repair any mechanical issues found.
  8. If wiring and connector are good but signal is bad, replace the input/turbine speed sensor and retest.
  9. If new sensor still shows faults and wiring checks good, test or substitute the TCM/PCM input circuit only after verifying with OEM diagnostics to avoid unnecessary module replacement.
  10. Clear codes and perform a road test to confirm repair. Monitor live data for stable turbine speed readings under various conditions.

Likely causes

  • Wiring connector fault (open/short/intermittent)
  • Failed turbine/input speed sensor
  • Contaminated sensor tip or incorrect air gap
  • Intermittent ground or power supply to sensor

Fault status

⚠️ Status
Input/Turbine Speed Sensor Circuit Range/Performance — control module detected signal outside expected parameters; MIL set. Further diagnosis required to isolate sensor, wiring, or module fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

P0715 P0720 P0721 P0722 P0725
856

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