2 Causes of Transmission Problems After a Fluid Change

Last Updated on January 14, 2021

The transmission of a vehicle is crucial for it to move and operate properly. The job of a transmission is to transmit power from the engine and deliver it to the wheels of the driving mechanism.

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There is a gearbox connecting to the transmission which lets the driver change gears. When the gears are changed, the rotating power and speed in the engine are converted based on the demands being put on it.

Like engines, the transmission contains many moving parts and components which constantly need to be lubricated. Transmission fluid is used to as a lubricant for these parts to keep them running smoothly and to cool them down in case they start to heat up.

After a while, your transmission fluid will get old and debris may start to build up in it. That is why most car manufacturers will recommend that you change your transmission fluid every 50,000 to 100,000 miles. This ensures the fluid is fresh and will not cause you any problems while out on the road.

Related: Transmission Fluid Color Chart

Top 2 Reasons For Transmission Problems After a Fluid Change

When you change your transmission fluid, you should not have any problems shifting gears or maintaining certain driving speeds. You also shouldn’t hear any unusual noises or experience any unusual symptoms.

However, there are cases when drivers will feel something wrong or hear noises coming from the transmission soon after they have changed their transmission fluid. This often makes them wonder why because they figure changing the fluid would have prevented strange things like this from happening.

So, why do these problems occur after the fluid has been changed? Below are two of the most common causes after a fluid change.

#1 – Varnish Deposits

burnt transmission fluid symptoms

When you have old or burnt transmission fluid, it may become discolored and cause varnish deposits to build up inside the system. These deposits typically float around the old fluid and don’t really build up anywhere as you continue using the same fluid.

However, once you change the old fluid with new fluid, these deposits get washed away and it becomes sludge that sticks to the filters of your transmission system. This prevents transmission fluid from flowing through the transmission, which results in those strange noises to be heard.

Therefore, you need to flush your transmission before adding new fluid. That is the best way to ensure that no pathways get clogged within the transmission.

#2 – Wrong Type of Transmission Fluid

what color is transmission fluid

It is best not to use traditional transmission fluid that is petroleum-based because these will leave the most deposits behind. Once these deposits build up on your filter and restrict the transmission fluid from flowing, it will cause the transmission’s components to heat up and create more friction.

This will result in clunking and other noises that you don’t want to hear. Fortunately, there are synthetic transmission fluids which are formulated to ensure that these components stay lubricated and that the gears shift smoothly. You will find this fluid marketed as “trans medic” in most cases.

Related: How Often to Change Transmission Fluid

Transmission Fluid Cost

The good news is that changing transmission fluid isn’t horribly expensive. Expect to pay $40 to $100 for new fluid since most modern vehicles need anywhere from 5 to 15 quarts. You’ll also need a filter and possibly a new pan gasket. However, the hardest part for most people will be replacing the old transmission fluid with the new fluid.

For this, you may have to go to a mechanic and have them perform the job for you. This will mean paying their hourly labor charge of between $80 and $110. So at minimum, you’re looking at a total cost of between $150 to $250 when you get your transmission fluid replaced by a professional.

Also, you may need to have them clean and flush the transmission too, so you can ensure that those deposits built up in the system are removed.

 

6 thoughts on “2 Causes of Transmission Problems After a Fluid Change”

  1. I have maintained my 2016 Honda Accord 159,000 miles one owner regularly with the dealership. In April I had a transmission flush. Everything was good from what the mechanic said. Yesterday my transmission went completely out! No warning signs that I am aware of. The same dealership said there is metal all in my fluid. Can it happen that fast? Please help I feel like they are going to give me the run around

    Reply
    • Yeah, I suppose it’s possible. Perhaps you didn’t notice the warning signs (for instance, hard shifting or a slight humming that wasn’t there before). It’s also possible something inside the transmission wore out over time. Maybe the shop in April put the wrong fluid in, or didn’t add enough transmission fluid. It’s hard to say without inspecting the failed transmission to determine the root cause of the failure.

      Reply
    • Scotty Kilmer on Youtube said that the engine must be turned off when changing fluid or the transmission will be low on fluid and cut itself, unless it’s refilled simultaneously.

      Reply
  2. Hi interesting reading- have a problem hope you can help. Had automatic gearbox box of my 1960 Cadillac reconditioned after only 200 miles the pipe came off losing fluid stopped within 200 yards pipe reconnected new fluid added. Then after only about 2 miles transmission slips with not pull at all. Leave to cool will drive a gain until hot.
    I assume some damage done when lost fluid but just 200 yards thought be ok- can you advise on this

    Reply

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