What are the causes of automatic transmission failure in the v73?

[Nellie]

Here are the specific reasons for automatic transmission failure in the v73: 1. Solenoid valve damage. Many cases of vehicle jerking during driving are caused by damaged shift solenoids or pressure solenoids. If the oil pressure solenoid is damaged, it can result in oil pressure that is too low or too high, leading to a sensation of impact or lag when the clutch or brake engages. Similarly, a stuck shift solenoid can cause power interruption. 2. Steel plate and friction plate burning. For example: shifting from 1st to 2nd gear and 2nd to 3rd gear may be normal, as well as other gears, but jerking occurs specifically when shifting from 3rd to 4th gear. This is likely due to slippage in the clutch or brake responsible for 4th gear. It is necessary to rule out solenoid valve failure, as solenoids can be easily measured and checked after removing the oil pan. Burnt clutch plates not only cause jerky shifting but also result in weak driving performance, and the debris from friction can contaminate the transmission fluid. 3. Failure to regularly change transmission fluid. If the automatic transmission is not maintained for a long time, various performance indicators of the transmission fluid, such as lubricity, viscosity, and temperature stability, will significantly decline. Particularly, the temperature of the automatic transmission fluid can become problematic if the radiator is too dirty and cannot dissipate heat. When the computer detects high temperatures, it will enter an emergency operation mode. When the oil temperature exceeds 135°, it can cause significant damage to friction plates, clutch plates, and other components.

[LaSamantha]

With decades of experience in car repair, I've encountered numerous automatic transmission failures in the V73 model. The most common causes are insufficient or deteriorated transmission fluid. Low fluid levels lead to inadequate internal lubrication, accelerating wear on the clutch and brake bands, resulting in noticeably sluggish or slipping gear shifts. The electronic control unit (ECU) also frequently malfunctions, especially when sensors fail, causing the transmission computer to receive chaotic signals and shift at incorrect times. In some cases, valve body blockages or wear cause inaccurate pressure regulation, leading to jerks or gear jams. If you hear unusual noises or experience rough shifting while driving, check the fluid level and change interval immediately. Generally, it's recommended to replace the transmission fluid every 60,000 kilometers, as regular maintenance can significantly extend the transmission's lifespan. If problems persist, a professional scan tool is necessary to accurately diagnose fault codes and pinpoint issues.