Code Definition

P0197 — Engine Oil Temperature Sensor Low

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

About P0197

P0197 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 P0197 is stored, the module has detected a signal or supply voltage lower 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 P0197 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 P0197 fault code is set when the Engine Control Module (ECM) detects a lower than expected input signal from the engine oil temperature sensor. This sensor measures the temperature of the engine oil, which is crucial for ensuring proper lubrication and protection of the engine components. Oil temperature affects the oil's viscosity and its ability to lubricate efficiently. A low input signal may indicate a problem such as a faulty sensor, a short to ground in the sensor circuit, or issues with the wiring or connectors. This can lead to the ECM receiving inaccurate information regarding the...

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