What is the reason for the car not being able to shift gears the day after driving through water?

[AliviaFitz]

The reasons why a car cannot shift gears the day after driving through water are as follows: 1. Air filter: The air filter is the gateway for air to enter the engine. After the vehicle has driven through water, check the air filter and intake pipes. If they are wet, it indicates that water may have entered the engine, and a thorough inspection of the engine's internal water ingress is required. 2. Engine compartment wiring harness: There are numerous wiring harnesses and circuits in the engine compartment. Driving through water can easily wet the connectors of the wiring harnesses. If the connectors are found to be wet during inspection, they need to be dried immediately. If not treated promptly, it may lead to a short circuit. 3. Chassis malfunction: When driving through water, dirt can accumulate in the gaps of the chassis and other areas, leading to rust and 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 a chassis armor can also enhance the chassis's rust resistance.