A604 5140429AA Transmission Solenoid for Auto Parts This transmission solenoid is designed to fit A604 models and replaces part number 5140429AA.It functions as an electronic valve that controls fluid flow within the automatic transmission system, supporting smooth gear shifts and.The solenoid integrates into the transmission valve body and responds to signals from the vehicle's powertrain control module.It is engineered for direct replacement and consistent performance in applicable vehicles. This item is a third-party substitute.Use of brand names is limited to indicating which devices it supports.