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The diagnostic trouble code P1184:00 refers to the engine oil temperature (EOT) sensor being out of the self-test range. This code indicates that the engine oil temperature sensor is not operating within the expected range during the self-test process.

The EOT sensor is responsible for monitoring the temperature of the engine oil. This information is important for the proper operation of the engine, as it helps the engine control module (ECM) adjust various parameters, such as fuel injection timing and cooling system operation.

Here are some possible causes and solutions for this issue:

1. Faulty EOT sensor: The EOT sensor itself may be faulty and providing inaccurate readings. In this case, the sensor should be replaced with a new one. Consult the vehicle’s service manual or a professional mechanic for the exact location and replacement procedure of the EOT sensor.
2. Wiring or connector issues: Check the wiring and connectors associated with the EOT sensor. Look for any signs of damage, such as frayed wires, loose connections, or corrosion. Repair or replace any damaged wiring or connectors as needed.
3. Cooling system problems: An issue with the cooling system, such as a malfunctioning thermostat or a low coolant level, can affect the engine oil temperature readings. Inspect the cooling system and address any cooling system-related issues.
4. Check engine oil level and quality: Ensure that the engine oil level is correct and that the oil is of the recommended type and quality. Low oil level or degraded oil can affect the accuracy of the EOT sensor readings.
5. ECM software update: In some cases, the ECM may require a software update to address issues with the EOT sensor readings. Consult a professional mechanic or dealership to check for any available software updates for the ECM.

It is important to note that these are general suggestions, and the specific diagnostic and repair procedures may vary depending on the make, model, and year of your vehicle. If you are unsure or uncomfortable performing these steps yourself, it is recommended to seek assistance from a qualified mechanic or dealership. They will have the necessary expertise and tools to accurately diagnose and resolve the issue with the EOT sensor.