Input/Turbine Speed Sensor Circuit Range/Performance
Diagnostic trouble code P0716 indicates that the powertrain control module (PCM) or transmission control module (TCM) has detected an erratic, irrational, or out-of-range signal from the input/turbine speed sensor circuit. The module sets this code when the input speed sensor data does not correlate properly with the engine speed and output speed sensor data, suggesting a malfunction in the sensor or its circuit.
While the vehicle can usually still be driven, erratic transmission behavior can lead to poor drivability and potential internal transmission damage if left unaddressed. It is recommended to diagnose and repair the issue soon to avoid further complications.
Common symptoms
- Illuminated Check Engine Light
- Harsh or delayed transmission shifting
- Transmission slipping or failing to shift
- Decreased fuel efficiency
- Speedometer functioning erratically or not at all
Likely causes
- Defective input/turbine speed sensor
- Damaged, corroded, or loose wiring and connectors in the sensor circuit
- Contaminated or low transmission fluid
- Faulty output speed sensor (causing correlation issues)
- Internal transmission mechanical failure
- Faulty PCM or TCM (rare)
What to check before replacing parts
Check the transmission fluid level and condition.
Look for: Fluid should be at the correct level and appear red/pink, not burnt, dark, or full of metal debris, which could indicate internal damage or cause sensor interference.
Visually inspect the input/turbine speed sensor wiring and connectors.
Look for: Look for chafed wires, melted insulation, corrosion in the connector pins, or a loose connection that could cause an intermittent or out-of-range signal.
Remove and inspect the input/turbine speed sensor.
Look for: Check the magnetic tip of the sensor for excessive metal shavings or debris, which can distort the signal being sent to the TCM.
Test the input/turbine speed sensor resistance using a multimeter.
Look for: Compare the measured resistance across the sensor terminals to the manufacturer's specified range; an open circuit or out-of-spec reading indicates a faulty sensor.
Monitor the input speed sensor data using a scan tool while driving.
Look for: The RPM reading should increase and decrease smoothly with engine speed; erratic drop-offs or spikes in the data indicate a failing sensor or wiring issue.
This page explains the generic P0716 definition and is general reference information, not a diagnosis for your specific vehicle. Actual causes, severity, and repairs vary by make, model, engine, and mileage — always confirm with a scan tool and a qualified technician before replacing parts.
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