Code Definition

P0718 — Input/Turbine Speed Sensor Circuit Intermittent

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0718

P0718 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0718 is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0718 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

This fault code is set when the Transmission Control Module (TCM) detects intermittent signals from the input/turbine speed sensor circuit. The input/turbine speed sensor is vital for determining the speed of the transmission's input shaft, informing the TCM's decision-making for gear shifts and overall transmission control. An intermittent fault in this sensor circuit suggests periodic disruptions or instability in the signal, potentially caused by issues like loose connections, intermittent sensor malfunctions, or wiring problems. Such intermittent signal transmission can lead to erratic tra...

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