What are the reasons for a car not being able to shift gears the day after driving through water?

[OFaith]

There are three main reasons why a car may not shift gears the day after driving through water: 1. Air filter: The air filter is the gateway for air to enter the engine. After the vehicle has driven through water, inspect the air filter and intake pipes. If they are wet, it indicates that water may have entered the engine, requiring a thorough check of the engine's internal condition. 2. Engine compartment wiring harness: The engine compartment contains numerous wiring harnesses and circuits. Driving through water can easily wet the connectors of these harnesses. If you find that the connectors are wet during inspection, they must be dried immediately to prevent potential short circuits. 3. Chassis issues: When driving through water, debris can accumulate in the gaps and crevices of the chassis, leading to rust or even component failure. Therefore, after driving through water, the owner should take the vehicle to a car wash for a thorough cleaning of the chassis. Applying an undercoating can also enhance the chassis's rust resistance.