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When the transmission does not downshift, one of the transmission solenoids might get stuck open or closed, which eventually prevents the fluid from flowing into the transmission valve body to press the appropriate gear. Any changes in the pressure of the transmission can also lead to numerous issues, including: 1. Common signs of problem in a transmission solenoidĪ transmission solenoid could go wrong due to some electrical problems or dirty fluid, which causes the shift solenoid to get stuck when open or closed. A transmission solenoid can be often used to regulate a single or multiple gears, depending upon the complication of the model. Otherwise, the ECU could control the plunger of the solenoid by turning on and off the ground circuit. If the car is designed with a specific TCU, it could close or open the hydraulic circuit by applying a direct 12-volt signal. The computer of a vehicle can regulate the shift solenoid in some ways. When this occurs, the transmission adjusts gears while you are continuing down on the road. When this wire’s coil receives the electrical charge from the ECU or the TCM, it makes the plunger to open, letting transmission fluid flow to the valve body as well as pressurize the expected bands and clutches. These shift solenoids are often made with an interior spring-loaded plunger, which is generally covered with wires. How do transmission solenoids work?Īs you are going down the road, the computer of your car will analyze information being provided by engine speed sensors and car speed sensors.īased on these data, the TCM (transmission control unit) or the ECU (engine control unit) performs the proper downshift or upshift by transmitting a signal to one of the transmission solenoids. So let’s take a look at the transmission solenoid and some of common issues associated with it. When one of those electro-mechanical valves go wrong, then all types of transmission issues can occur. Modern automatic transmissions are basically designed with pressurized hydraulic fluid to adjust gears.Įach time a change of the gear is required, the computer of a vehicle will activate a transmission solenoid, which helps to direct transmission fluid to the valve body to involve the proper gear.