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What are the common faults after the transmission is submerged in water?

2 Answers

Johnson

07/24/25 3:29am

Common faults after the transmission is submerged in water are as follows: 1. Deterioration of automatic transmission fluid: Water entering the automatic transmission directly causes the automatic transmission fluid to deteriorate and oxidize, thereby reducing its friction coefficient. As a result, insufficient friction between vehicle components can lead to faults such as jerking, impact, and slipping in the automatic transmission. 2. Clutch damage: After water enters the automatic transmission, it not only damages the automatic transmission fluid but is also highly detrimental to the automatic transmission clutch plates. If the automatic transmission clutch is submerged in water and cannot be repaired, replacement is the only recommended solution, which will correspondingly increase the maintenance costs.

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LondynLynn

08/10/25 11:04pm

After the transmission is exposed to water, problems may start with the fluid. I once drove through a flooded area, and water seeped into the transmission through gaps, contaminating the lubricating oil. The mixture of water and oil forms a white emulsion, reducing lubrication performance. Without proper protection, gears and bearings quickly rust or wear out. Abnormal metal friction sounds may occur during gear shifts, or even stuttering and lack of smoothness. Automatic transmissions suffer even more—if the electronic control unit gets wet, it can short-circuit or malfunction, leading to chaotic shift logic or complete failure. Over time, friction plates or clutch components may also deform due to water exposure, accelerating aging. In such cases, emergency towing is necessary, followed by oil replacement, system flushing, and inspection of all seals. Don’t push your luck by continuing to drive, or repair costs will skyrocket, compromising driving safety. Regularly checking transmission seals during maintenance is a key preventive measure.

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