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Replacement Automatic Transmission Solenoid Information

Choose from top brands including: Standard Motor Products, Genuine, Mopar, Original Equipment, ATP, Dorman, ZF, Pioneer Cables, Delphi, AC Delco, API, Vemo and Denso.


Automatic Transmission SolenoidAn automatic transmission is a complex mechanical device that uses variability of fluid pressure to know when it should switch to higher or lower gears. Transmission fluid is transferred from one compartment of the transmission to another, engaging and disengaging the gear sets. When sensors in the transmission detect the right series of movements, a small electric valve opens to allow the transmission fluid to transfer between compartments. The switch that controls the valve is called an automatic transmission solenoid. It is in direct communication with the transmission computer which is a subsystem of the vehicle control computer and allows for precise control of fluid flow.

The solenoids can be found on the transmission valve body and are contained within an assembly that also contains the electrical apparatus required to switch them on and off. While most transmissions in modern vehicles only use one or two solenoids, a maximum of four solenoids can be used. On occasion you have to get an solenoid for road safety or performance concerns, and sometimes it's an item for fun; regardless, acquire the highest level of reliability you can afford. Usually the most frustrating thing about restoring a vehicle is hunting down a top-rated source for reliable parts.

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Automatic Transmission Solenoid Information

The Delphi Automatic Transmission Solenoid controls the flow of transmission fluid into and through the automatic transmission.


Delphi

Delphi Automatic Transmission Solenoid
The Automatic Transmission Solenoid is an electromechanical valve that controls the flow of transmission fluid into and through the automatic transmission. A voltage or current, the supply of which is controlled by the transmission controller or computer, powers the transmission solenoids. Some of the warning signs that point to a bad solenoid are delays in shifting into second and third gears, failure of reverse, and issues with downshifting and acceleration. If you have any of these problems, consider replacing your solenoid with the Delphi Automatic Transmission Solenoid, available from PartsGeek. Delphi is an original equipment brand that partners with other manufacturers to supply the parts your car was originally built with. This product is in a Delphi package, but note that an independent Delphi supplier may have manufactured the part.


The Dorman Automatic Transmission Solenoid controls the flow of transmission fluid into and through the automatic transmission


Dorman

Dorman Automatic Transmission Solenoid
The Automatic Transmission Solenoid typically comes in a pack installed in a transmission control unit, transmission control module, or transmission valve body. Based on instructions received from the transmission computer, individual transmission solenoids direct transmission fluid to particular clutch packs or servo valves to control gear shifting in accordance with driving conditions and engine requirements. Usually a vehicle shifts gears as soon as the gear change is initiated, but a bad solenoid may cause a delay in the second and third gears, as well as problems with the reverse gear, downshifting, and acceleration. If you experience any of these problems, consider replacing your solenoid with the Dorman Automatic Transmission Solenoid, a high quality, direct fit OE replacement, available from PartsGeek.


The Mopar Automatic Transmission Solenoid controls the flow of transmission fluid into and through the automatic transmission


Mopar

Mopar Automatic Transmission Solenoid
Your vehicle's transmission transfers power generated by the engine to the drive wheels. The transmission uses a hydraulic system controlled by a group of solenoids to shift gears automatically as you drive. Units of this type are called automatic, or computer-controlled, transmissions. The Automatic Transmission Solenoid is an electromechanical valve that controls the flow of transmission fluid into and through the automatic transmission. Usually a vehicle shifts gears as soon as the gear change is initiated, but a bad solenoid may cause a delay in the second and third gears, as well as problems with the reverse gear, downshifting, and acceleration. If you experience any of these problems, consider replacing your solenoid with the Mopar Automatic Transmission Solenoid, available from PartsGeek.


The Standard Automatic Transmission Solenoid controls the flow of transmission fluid into and through the automatic transmission


Standard

Standard Automatic Transmission Solenoid
The Automatic Transmission Solenoid controls the flow of transmission fluid into and through the automatic transmission. It consists of nine parts: the valve body, an inlet port, an outlet port, the solenoid coil body, coil winding, lead wires, a plunger or piston, a spring, and an orifice. The body is made of steel with a metallic finish, and is hollow inside. The coil is enameled wire around a conductive material such as steel or iron. The coil and core take the form of a hollow cylinder in the interior of which resides a plunger. The orifice is the connection point between the inlet and outlet ports through which the transmission fluid flows. Acting against the force of the spring, the plunger controls the opening and closing of the orifice. Signs of a bad solenoid are delays in shifting into second and third gears, failure of reverse, and issues with downshifting and acceleration. If you notice any of these signs, consider replacing your solenoid with the Standard Automatic Transmission Solenoid, available from PartsGeek. This is a high quality, direct fit OE replacement transmission control solenoid, and comes with Standard's 90-day or 3,000-mile warranty.


Automatic Transmission Solenoid

Sloppy shifts and sticky gears aren't the end of the world, so don't give up on your car if you're faced with transmission problems. Sure, replacing an automatic transmission is expensive, but you may not have to go that far. The problem might be in a relatively inexpensive part, such as the automatic transmission solenoid. Do some diagnostics and check out your options before your make any big decisions.

Your transmission switches gears by creating an accurate and quick movement of hydraulic fluid from one compartment to another. The different pressures cause gears to engage, allowing you to operate efficiently and automatically. Your AT solenoid is the part that opens valves and allows the fluid to pass into different chambers.

We offer the best brands in the industry when it comes to transmission components. Find it all at PartsGeek.com, whether you want ZF, AC Delco, Genuine, Dorman, Delphi, Standard Motor Products, Mopar, ATP or Denso. We have millions of products in stock, and our sophisticated inventory system makes sure your order ships out as soon as possible. Still not convinced? Don't let doubt stop you, just use our 30-day return policy if you end up having second thoughts.

What is an automatic transmission solenoid?

Most vehicle owners don't have a lot of experience with their AT solenoid due to the relative difficulty involved in accessing it. Your solenoids should be located in your transmission on the valve body, inside an assembly with the electrical switch apparatus that operates them.

Different car manufacturers have vastly different automatic transmission solenoid design, but the general purpose is the same. They allow fluid to move between chambers in your transmission in order to shift gears.

AT Solenoids in the Shifting Process

  1. RPM and vehicle speed sensors report to the transmission control unit (TCU).
  2. Your TCU determines when to shift.
  3. A signal is sent to charge your solenoids.
  4. Electrified solenoids cause valves to open, directing transmission fluid to different chambers.
  5. The change in hydraulic pressure shifts gears.

The solenoids themselves are electromagnets that operate the valves in your transmission. There are many types parts called solenoids in your vehicle, so make sure you're getting the automatic transmission solenoid you need when you order.

How much is an AT solenoid?

Your part should cost anywhere from $15-200 to replace. You may want to replace more than one solenoid at a time, as there could be as many as four in your transmission. That would bring your total up to $60-800, depending on the make and model of your vehicle.

What are the symptoms of a bad AT solenoid?

Diagnostic testing is one of the best ways to isolate your AT solenoid as the cause of your car problems. However, these are some of the problems that should point you toward testing your transmission in the first place:

  • Inability to shift down
  • Slipping or erratic gear shifting
  • Clutch delays
  • Being stuck in neutral gear
  • Check engine warning lights

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Reviewer: joe hernandez

Gasket was packed in bottom under solenoid peg and broke the side of gasket.other than that pleased and satisfied with delivery.

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Reviewer: CK

when damaged, this product causes the drive LED to flash on a 1997 civic EX

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