Code Definition

P0940 — Hydraulic Oil Temperature Sensor Circuit High Input

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

About P0940

P0940 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 P0940 is stored, the module has detected a signal or supply voltage higher than the expected operating range; 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 P0940 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 P0940 fault code is activated when the control module detects a high input condition in the hydraulic oil temperature sensor circuit. This circuit is essential for monitoring the temperature of the hydraulic oil in systems like the transmission or power steering. A high input condition suggests that the signal from the hydraulic oil temperature sensor to the control module is above the normal range, potentially due to a sensor malfunction, a short to power in the circuit, or issues with the wiring or connectors. High input can result in erroneously high temperature readings, which might af...

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