P0196 - ENGINE OIL TEMPERATURE SENSOR RANGE / PERFORMANCE

The Engine Oil Temperature (EOT) sensor, usually located on diesel engines, sends a voltage signal to the Powertrain Control Module (PCM), which is used to determine fuel quality, injection timing, and glow plug performance. This signal is also compared to other temperature sensors for certain diagnostics.

The EOT sensors receive a 5-volt reference from the PCM, and has a variable resistance depending on the engine oil temperature, then send a signal back to the PCM.

When the P0196 OBDII fault code is set, it is because the Powertrain Control Module detected a performance problem with the Engine Oil Temperature Sensor.

• Check Engine light illuminated.
• Engine overheat conditions.
• Other DTCs stored relating to coolant temperature.

The reasons for setting the P0196 OBD2 diagnostic code are:

• Circuit wires or connectors may have been damaged.
• The EOT sensor may be faulty.
• The engine cooling system may be deficient.

To troubleshoot the problems related to the DTC P0196 OBDII code you should do the following:

• To start with the respective diagnosis it is recommended to verify the Technical Service Bulletins (TSB).
• Inspect the components of the engine oil temperature sensor circuit and the sensor itself. Verify that there are no burnt wires or connectors with high levels of corrosion. Repair it as necessary.
• Check the engine cooling system for proper operation. If the engine temperature is higher than allowed, you must verify that it is not due to components of this system in bad condition.
• Measure the electrical values of the engine oil temperature sensor Verify that the reference voltages and ground signals are as indicated by the manufacturer. Repair it as necessary.
• Use an automotive scanner to check the EOT sensor Follow manufacturer's recommendations to verify proper condition. Replace if required.