Automatic Transmission Valve Body Solenoid

Signs of a failing shift solenoid.

Automatic transmission valve body solenoid.

As the name suggests automatic transmission valve body is a major component of a vehicle s automatic transmission system. Automatic cars have transmission solenoids to control gear engagement and disengagement without human intervention. The solenoid plungers are constantly bathed in fluid from the transmission and metal salt from the manufacturing process and normal wear as well as detritus. Replacing a transmission shift solenoid or a shift solenoid pack involves dropping the transmission oil pan in order to access the valve body where the solenoids solenoid pack is mounted locating and replacing the faulty solenoid and then replacing the oil pan using a new pan gasket before refilling the transmission with the correct.

These solenoids operate submerged in transmission fluid and fail primarily from repeated hot and cold cycling in this harsh environment. When it s time to shift the transmission control unit sends out power or ground to the required shift solenoid and it causes the solenoid to open and let the transmission oil flow into the valve body. The function of a transmission shift solenoid. The shift solenoids are spring loaded with a coil inside.

A transmission solenoid is an electromechanical valve that controls the flow of transmission fluid into and through an automatic transmission. A transmission control solenoid is located in the valve body in the transmission control unit tcu of a system. The bmw hp519 five speed transmission has seven solenoids six on the back of the valve body and one on the top. The bmw repair guide recommends leaving the wiring harness in the transmission when removing the valve body.

Your transmission shift solenoids mount on the transmission valve body that controls fluid flow through the various circuits and passages in the transmission. A bad transmission solenoid can result in the malfunctioning of the entire transmission system. Modern automatic transmissions are basically designed with pressurized hydraulic fluid to adjust gears. When one of those electro mechanical valves go wrong then all types of transmission issues can.

In modern transmissions a transmission solenoid typically comes in a pack installed in a transmission control unit transmission control module or transmission valve body. It works in a network form. As such it is important to understand its working within the transmission control unit of your car and therefore be able to know. Unfortunately the top one is not accessible unless the valve body is removed from the transmission.

Mechanical failures can also occur. It can be seen after removing the transmission pan attached to the valve body. Generally multiple solenoids are used in a system and each has color coded wires for ease of identification and replacement. A shift solenoid integrated into a transmission valve body.