Automatic Transmission Valve Body Functions and Failure Symptoms
As the name suggests, automatic transmission valve body is a major component of a vehicle’s automatic transmission system. It works in a network form. The body directs pressurized transmission fluid to a network of valves that put together appropriate clutch packs for smooth gear functioning. Further, the valves use the pressure of hydraulic signals, determining the gear set, also known as servo. This process performs when the gear changes the speed from low to high or vice-versa.
Key Functions of Valve Body
An automatic transmission system has a valve body, which serves as the main control center. The valve body has numerous passages and channels within the valve body. It allows the flow of hydraulic fluid to different valves to direct the right clutch and switch the gear appropriately according to the driving situation. The most important part of the valve body is the manual valve. Connected to the gear stick handle, it instructs the right passage for hydraulic fluid to pass through.
Now, modern automatic transmission valve body has sensors to monitor the speed, brake pedal position, throttle position and engine load to perform a soft and firm gear shift. The sensors send vital information to the onboard engine management computer. It further directs the electrically controlled solenoid that redirects the hydraulic fluid to the right clutch pack.
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Failure Symptoms of Automatic Transmission Valve Body
There are a few transmission valve body symptoms suggesting a bad transmission valve body. Most of these are quite noticeable. Chances are that one cannot bear these for too long as it affects the driving ability and causes frustration when changing gears. Here are the top symptoms that must not ignore.
1. Knocking Noises
When applying pressure to the brakes or slowing down the care, you might hear some banging or knocking noises. Chances are that you may hear some awkward noises when putting the car on reverse and driving backward. If your answer is yes to any of such scenario concludes that you have a bad valve body.
2. Slippage While Gear Shifting
If the shifting stick slips regularly when changing the gears, then there is likely a problem with the transmission valve body. Your shifting stick should never slip if the transmission valve body functions properly. That means there is something wrong.
3. Difficulty in Downshift
In case transmission is having difficulty in downshifting, it states that hydraulic fluid is unable to enter the transmission value body properly. Once this starts happening, the gears will not function properly, thus degrading the performance of the vehicle.
4. Delay in Shifting
Are you facing problem while changing your gears to reverse or drive? Most often, it is because of the transmission valve body that is working improperly. Thus, the shifting of the transmission experiences a great delay. Be ready! Due to this, it may cause the car to stuck in neutral.
With the advanced technology, malfunctioning transmission detection takes place easily with the help of an engine management computer. It alerts the driver by activating a warning light on the vehicle’s dashboard. As one of the maintenance tips, one could do a timely inspection of the transmission valve body to enhance its functioning.