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The diagnostic trouble code 2F99 pertains to a plausibility issue with the Outside Temperature Sensor (OTS) in the Digital Motor Electronics (DME) module of the vehicle. This code indicates that the DME module has detected an inconsistency or implausible reading from the outside temperature sensor.

Here are some possible causes and solutions for this issue:

1. Faulty outside temperature sensor: The outside temperature sensor may be faulty, leading to inaccurate or inconsistent readings. Inspect the sensor for any signs of damage or malfunction. If necessary, replace the outside temperature sensor with a new one.
2. Wiring or connection issues: Check the wiring harness and connectors associated with the outside temperature sensor. Look for any signs of damage, loose connections, or corrosion. Repair or replace any damaged wiring or connectors as needed.
3. Environmental factors: Extreme temperatures, such as very hot or cold weather, can affect the accuracy of the outside temperature sensor. Ensure that the sensor is not exposed to any extreme conditions or external factors that could impact its performance.
4. DME software update: In some cases, a software update for the DME module may be available from the manufacturer. Updating the DME software with the latest version may resolve the plausibility issue with the outside temperature sensor. Consult a professional mechanic or dealership to perform the software update.

It’s 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. It is recommended to consult a professional mechanic or dealership for a proper diagnosis and to determine the appropriate steps to resolve the 2F99 DME trouble code related to the outside temperature sensor plausibility.