Code Definition

P0708 — Transmission Range Sensor Circuit High Input

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

About P0708

P0708 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 P0708 is stored, the module has detected a signal or supply voltage higher than the expected operating range; a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour; and 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 P0708 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

The P0708 code is set when the Engine Control Module (ECM) or Transmission Control Module (TCM) detects a high input signal from the transmission range sensor circuit. This sensor, often referred to as the Park/Neutral Position (PNP) switch, is responsible for indicating the current gear position of the transmission to the ECM/TCM. A high input signal may suggest an open circuit or a fault within the sensor itself, leading to inaccurate or unreliable gear position readings. This malfunction can impact various aspects of vehicle operation, including the ability to start the engine, erratic shif...

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