Code Definition

P0938 — Hydraulic Oil Temperature Sensor Range/Performance

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

About P0938

P0938 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 P0938 is stored, the module has detected 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 P0938 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 P0938 fault code is triggered when the control module detects a range or performance issue with the hydraulic oil temperature sensor circuit. This sensor is vital for monitoring the temperature of the hydraulic oil in systems like automatic transmissions or power steering units. A range/performance issue suggests that the sensor's output is either outside the expected parameters set by the manufacturer or not performing efficiently. This could be due to a malfunctioning hydraulic oil temperature sensor, issues in the electrical connections, or problems with the control module's ability to ...

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