What is the function of the automatic transmission solenoid valve?
3 Answers
The function of the automatic transmission solenoid valve: The solenoid valve is controlled by the transmission control module (TCU). The pressure in neutral and in gear is basically a constant value. The opening of the solenoid valve is adjusted during gear shifting to improve shifting smoothness. Different solenoid valves control different clutches or brakes, functioning in different gears. The solenoid valves mainly refer to two pressure-regulating solenoid valves: one regulates the main oil pressure, and the other regulates the lock-up oil pressure of the torque converter. These two oil pressures also control the operation of the shift valve body in the oil circuit plate. If either of them malfunctions, it can cause shifting shock. Over time, this can wear out the clutch plates and brake bands inside the transmission, leading to more serious faults.
That solenoid valve in the automatic transmission is basically the thing that controls oil pressure to ensure smooth gear shifts. My experience tells me it acts like a small valve inside the transmission, receiving electrical signals from the computer to determine how much to open, directing oil flow to where it's needed for upshifts, downshifts, or clutch locking. After decades of repairing cars, common issues include dirty oil causing the valve to stick, leading to delayed or jerky gear changes. During inspections, checking resistance and operational flexibility is key. Remember to change transmission fluid regularly to prevent wear—don't wait until the car breaks down. Simple maintenance extends vehicle lifespan and ensures safer driving.
As an ordinary car enthusiast, I feel the solenoid valve is the soul component of an automatic transmission—it works silently in the background to ensure smooth gear shifts. I often experience jerking issues while driving, and after checking, it turns out to be slow solenoid valve response, affecting oil pressure control and causing gear shift hesitation. My suggestion is to start with routine maintenance, such as changing the oil on time to avoid impurities, avoiding aggressive throttle inputs, and reducing load. Detecting fault codes early or scheduling regular inspections at professional shops can save you from major repairs. After all, when this part fails, the jerking while driving is uncomfortable and affects both mood and efficiency.
