Transmission Fluid Leak Only When Running

A transmission fluid leak that only occurs while the engine is running could be due to a faulty seal or gasket. It’s possible that the seal has become worn down over time, allowing fluid to escape when pressure builds up in the system due to operational forces. Another possibility is an issue with the lines themselves; if they are loose, warped, cracked or corroded then this could cause leaks as well.

The best way to identify and address these issues is by having a professional mechanic inspect your car and replace any necessary parts. It may also help to check all of your hoses for wear and tear before attempting any repairs yourself.

If you have noticed a fluid leak from your vehicle only when it is running, it could be a sign of transmission fluid leaking. Transmission fluid is essential for lubrication and cooling the components of the transmission system as well as providing hydraulic pressure to shift gears. If there is not enough fluid in circulation, this can lead to major problems for your car’s performance and possibly costly repairs down the road.

It’s important to get any potential leaks inspected by an experienced mechanic right away before more serious damage occurs.

6 Causes of Transmission Fluid Leak When Parked. How to Prevent?

Why Does My Transmission Only Leak When My Car is Running?

When your transmission is running, the fluid pressure inside of it rises. This increase in pressure can cause any existing leaks or cracks to become more pronounced and start leaking oil more quickly. If these leaks are not detected early enough, they may worsen over time and begin to leak even when your car is off.

Additionally, some transmissions have components that move while the engine is on, which can create additional stress on seals and gaskets that may be already weakened or cracked from age or wear-and-tear. In both cases, a lack of maintenance or using low quality fluids could also contribute to this problem.

How Do I Know If My Torque Converter is Leaking?

If you suspect your torque converter is leaking, there are several ways to check for a leak. Firstly, look around the transmission pan and inspect for any signs of fluid leakage. If you find any evidence of fluid buildup or wetness on the outside of the pan then it’s highly likely that your torque converter is leaking.

Secondly, take a few moments to examine the area where the torque converter connects to the transmission itself. Look for any sign of seepage or dripping as this could indicate a leak in your torque converter seal. Finally, if you have access to an appropriate diagnostic tool such as an OBD2 scanner with live data capabilities then you can use this to detect if there is excessive heat generated by either component which would suggest a possible fault within them such as a leaking torque converter.

Where Do Transmission Fluid Leaks Most Commonly Occur?

Transmission fluid leaks can occur in a variety of places, but the most common sources are worn seals and gaskets. These components are located on the transmission pan, as well as around other areas like the input shaft seal and output shaft seal. If there is any wear or damage to these parts, it can cause a leak which should be addressed immediately.

Other potential causes include loose fittings or clamps that have become disconnected due to vibration over time. It’s important to regularly inspect your vehicle for signs of leaks in order to prevent more serious issues from occurring later on down the line.

How Serious is a Slow Transmission Leak?

A slow transmission leak can be very serious if left unaddressed. The fluid in the transmission is necessary for lubricating, cooling and keeping all of the parts moving smoothly. If your vehicle experiences a slow transmission leak, it can lead to further damage such as burned clutches or a seized torque converter.

It’s important to take care of any leaks immediately in order to avoid costly repairs down the line. If you’re unsure about how bad the leak is, it’s best to have an experienced technician inspect your vehicle right away and advise you on what steps need to be taken.

Transmission Fluid Leak Only When Running


If a Vehicle is Leaking Fluid from the Transmission Bell Housing Which is the Most Likely Cause

Leaking fluid from the transmission bell housing is usually a sign of a major issue with your vehicle’s transmission. The most likely cause of this type of leak could be a crack in the bell housing, which would need to be replaced in order to stop the leak. Additionally, it might be due to loose or worn seals and gaskets around the bell housing, which should also be replaced if necessary.

It is important to properly diagnose and repair any leakage coming from the bell housing as soon as possible so that further damage can be avoided.

Transmission Fluid Leak between Engine And Transmission

If your vehicle is leaking transmission fluid between the engine and transmission, it’s important to get it fixed as quickly as possible. Transmission fluid plays an essential role in keeping your car running smoothly – if there’s a leak, then you’re losing vital lubrication and could eventually cause major problems with your engine. Make sure to take your car into a trusted mechanic or service provider right away so they can diagnose the issue and make any necessary repairs.

Transmission Fluid Gushing Out

If your car begins to gush out transmission fluid, it is important to take immediate action. Transmission fluid leaking from your vehicle can cause further damage to the engine, and lead to costly repairs. If you are noticing a large amount of transmission fluid spilling on the ground beneath your car, have it checked by a qualified mechanic as soon as possible.


In conclusion, it appears that a transmission fluid leak only occurs when the engine is running. This can be due to various factors such as leaks in the seals, clogged filters or worn out parts. To fix this issue, it is best to get a professional mechanic to diagnose and repair the problem.

Doing so will help ensure that your vehicle runs smoothly and safely for years to come.


  • Alex Gearhart

    Alex Gearhart, an automotive expert specializing in transmissions, has over a decade of hands-on industry experience. With extensive knowledge in manual and automatic systems, Alex is passionate about educating car enthusiasts on vehicle maintenance. As the chief author at, Alex simplifies complex concepts for readers, helping them make informed decisions about their vehicles. Outside of work, Alex enjoys road trips, restoring classic cars, and exploring new automotive technologies.

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