Does the engine turn over or does nothing happen when you turn the key?
First thing you need to check is if there is water in the engine oil. This may not prevent it from starting but you don't want to start it if the oil is milky. If it is, drain immediately and change the filter, then refill with new oil.
Then you need to see if water entered the engine through the intake. Remove the air filter and see if there is water marks past the air filter. If there is then you ingested water in the engine and it is probably hydro-locked which means the engine has failed.
If the engine turns over then you need to inspect electrical connectors for water intrusion. There is no easy way to do this other than taking them apart and looking at them. More than likely you have wiring damage and possible module damage due to water/corrosion.
If you have auto insurance on this vehicle then you should call them and report this because most all insurance covers floods.
Let me know if you have questions. Thanks
Friday, September 27th, 2019 AT 1:15 PM