5 Causes of Transmission Fluid Leaks and Repair Cost

Last Updated on April 23, 2020

If you notice a small puddle of red fluid underneath your vehicle, this is not a good sign and indicates a transmission fluid leak. It will form stains on your driveway or garage floor but more importantly, it can cost you a lot of money in repairing the leak and replacing the fluid.

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To understand the reasons behind leaking transmission fluid and the cost to repair it, keep reading.

Top 5 Causes of Transmission Fluid Leaks

Your transmission may leak because of minor issues or critical ones. Despite the type of problem that it is, you should never let a leaky transmission wait. Get it checked right away.

If you wait to get a simple repair done, the problem will get much worse and cost you more money to fix. Here are 5 of the most common causes of transmission fluid leaks.

#1 – Transmission Pan or Drain Plug

transmission pan leaking

Over time, your transmission pan will eventually experience some wear and tear. This is because while driving, the pan of your transmission is susceptible to damage from all the loose rocks and debris on the road.

If the pan gets a small puncture or there are loose drain plugs or bolts, then a leak can occur. If a big rock or other object were to damage the pan, the transmission will lose fluid quickly. You will know right away when this is happening.

On the other hand, a small hole or puncture will take longer for you to notice. If your drain plug or bolt is not tightened enough (or over-tightened to the point of stripping), it could cause a leak too. Too often, this happens immediately after you change the transmission fluid.

#2 – Seals are Broken

An automatic transmission sustains hydraulic pressure through a variety of transmission seals. However, over time, these seals will crack and get worn out, especially when being exposed to heat often.

If you get a transmission leak from this, there are many areas of the transmission to check. Most commonly, you’ll find the leaky seal in either the input shaft or output shaft. Otherwise, you should also inspect the transmission pan, driveshaft, plug seals, sensors, shifter housing seal, valve body, tail housing seal, and speedometer input seal.

#3 – Transmission Pan Gasket Fails

transmission gasket leaking

The gasket on your transmission pan can become damaged or cracked due to poor manufacturing, bad gasket alignment during the previous install, or constant exposure to hot temperatures. The pan gasket is cheap to replace so you should do it right away. Otherwise, more serious problems will soon follow.

#4 – Torque Converter Leakage

Transmission fluid is propelled into the whole system by the torque converter. If this torque pump has a crack anywhere on its body or has damaged needle bearings, it will leak transmission fluid. Since this isn’t a simple fix, taking your car to the mechanic for replacement is often the only option.

#5 – Fluid Line is Cracked

The fluid lines of a transmission are constructed of either steel or aluminum. These lines are usually quite durable but if they get damaged from road debris or exposed to heat too often, then the lines can crack or even completely break.

Typical Cost to Fix a Transmission Fluid Leak

If you have fluid leaking from your transmission, the typical cost to repair the leak (without taking off the transmission) is between $150 and $200. For this amount, you will get a replacement of the pan bolts, drain plugs, seals, gasket, fluid lines.

However, the true cost will be determined by where the leak is actually coming from on the transmission. If the front seal is where the leak is, then you will have to remove the transmission first. This will obviously increase the price of the repair job by a good amount.

Inspection Method

The auto mechanic will observe where the transmission fluid leak is coming from. They will be able to tell the location based on how the fluid is dripping.

Most of the time, the transmission fluid will go down a path that has the least resistance to it. If the leak is caused by a part that is loose, this part will get tightened by the mechanic.

If the part is damaged or cracked, then it will be replaced. Before any of this work is done though, the mechanic will give you an estimate on how much this will all cost to perform.

 

Comments

  1. THE MOST EXPENSIVE TRANS LINE BRILE ON MY 2009 VOLVO C30 THE PART COST AROUND 180.00 THE GARAGE IS CHARGING ME TOTAL600.00 THIS INCLUDES LINE,TRANS FLUID AND LABOUR. IS THIS A FAIR PRICE.

    Reply
  2. I have a 2003 Chevy Malibu that is leaking transmission fluide and I cant see where its leaking from or how. Do you think it will cost a lot to repair

    Reply
    • I have a 2007 volkswag jetta and noticed the rubber tubing that connects ro the transmission fluid bowl is disconnected and caused all the fluids to spill out under the hood. Is something I can easily fix?

      Reply
    • Find the leak yourself and remove the line leaking or part and learn to do it yourself I save a lot of money this way and I don’t get ripped off by these mechanics!

      Reply
      • I think that’s great but I need to see under the car in order to be able to know what to look for I used to work on cars but I’m a senior now and yes I’m a female can you tell me how I can find pictures to show me the underneath of the vehicle I have a 2007 Ford Taurus SE if you can help please let me know

        Reply
  3. Just did my 2013 VF Commodore. Converter was cracked, so the gearbox was pulled out, converter sent away for a test and repair, refitted, with full new tranny oil, had the new seal put in also as well as a rear engine seal at the same time, changed the oil and filter at the time.
    $1600 all up.
    Holden quoted me $5300

    Reply
  4. i noticed transmission fluid drops on my garage flooring .
    my car is a 2006 Jaguar S type sedan with 77 thousand miles on it ..
    I have an AAMCO Transmission repair near me in Del ray beach FL
    that im thinking of taking my car to .. do you think they are a
    decent reliable honest outfit ?

    Reply
    • Some AAMCOs are hit or miss but that particular location has a good amount of positive reviews on Google so yes, I’d have them check it out.

      Reply
  5. William No I would check around your line should run about 130$ at most and fluid 30$ at most on top of the 180$ for the part. Labor is seeming a bit steep.

    Reply
  6. I noticed that I have a transmission leak. when it is hot and full and I back up from an parking space it leaves a trail oil one the ground or pavement. it seems to be doing it also when I drive away from parking space as well. trying to determine if it is a front seal, converter or pan gasket problem?
    have a cost estimate for changing the pan with new filter etc at @ 178.00.
    WHAT IS YOU BEST GUESS AS TO WHY AND WHERE THIS LEAK IS COMING FROM????

    Reply
    • I was driving my 2003 dodge stratus on interstate when I noticed a cloud of smoke coming from what appeared behind me. I pulled over and opened the hood and transmission fluid was everywhere. It looked like the fluid was coming out from the pan and seal I’m assuming. However, what would make it go under the good like that? Could this be more than one issue? I just bought this car from an individual days ago who is not willing to help me please tell me this isn’t serious

      Reply
    • Dry the area and remove pan yourself much cheaper to DIY! I did mine and YouTube helped me step by step! Voila! Didn’t cost me a dime! Save your money

      Reply
  7. My 04 F150 was hesitant at first in drive but picked up the pace but it was missing in an out finally catching I checked transmission fluid it was reading little low I put a quart an a half in but it went straight on the ground I just had it rebuilt but at low speed going in 3rd gear it would miss then catch but going at a high rate of speed it didn’t miss now when adding fluid it goes on the ground an their was a winding noise

    Reply
  8. hAVE A 1994 fORD RANGER TRUCK. 200,000 MILES. CHECK ENGINE LIGHT COMES ON AND STAYS ON. TRUCK WILL NOT GO FORWARD IN ANY GEAR. WORKS IN REVERSE. SHADE TREE MECHANIC TELLS ME IT IS THE AUTOMATIC TRANSMISSION SUPPLY LINE. WHAT’S YOUR THOUGHT. HOW MUCH SHOULD IT COST ME TO REPAIR?

    Reply
  9. My 1995 F150 automatic transmission is getting rid of fluid at the rate of 1 qt. Per week . Not leaking on carport.Dont know where it’s going.

    Reply
    • If there’s no fluid on the ground, it’s likely a leak coming from the lines. They’re pressurized only when the engine is running, otherwise the fluid goes back in the pan. Check for cracks or punctures. Even if it’s a tiny hole, you can lose a lot of fluid due to it being pressurized.

      Reply
  10. My Pontiac Grand Am is leaking transmission fluid at a high rate. I put about three to four quarts in to move across the street due street cleaning. It runs great, but just can’t keep the fluid in. Can you help with some advice.

    Reply
    • You’ll have to get under the vehicle to locate the source of the leak. See above for common areas to check. If leaking at a high rate, it’s likely a pressurized line.

      Reply
  11. I have 1997 Chrysler Sebring convertible thats leaking transmission fluid .i had the transmission pan replaced and gasket dune already and its still leaking transmission fluid can you tellz whats seriously going on please .and im tried of putting transmission fluid in it bout 7 to 8 times a day and thays Very costly.

    Reply
  12. I have a 2004 ford expedition and have fluid problems. I tried to add fluid and it all went on the floor. I can also see the transmission fluid dipstick sticking out under my car what can be the problem

    Reply
    • Just a guess. I would check the tube that the dipstick gets guided down and make sure it goes all the way into the transmission. There’s a bolt that holds it in place about halfway down on most engines. It may simply be that the tube is not connected. I hope that’s all it is.

      Reply
  13. Hi – I Recently had my 2013 Honda Odyssey at the dealer for a transmission fluid flush (120k miles) They said I had a ‘small leak’ which I never noticed before and wanted to charge $850 to replace the lines. I said no. Took the car home and next day a huge puddle of fluid in the garage. Took the car back – they said the lines are rusted and disintegrating and falling off, the flush likely accelerated the leak. $850 to fix. This seems way too expensive. Any advice?

    Reply
    • You need to DIY. Find the line buy it. And have a mechanic replace that line. If you know it’s a line go to another mechanic. He is ripping you off

      Reply
  14. Toyota dealership mechanic said they cannot fix the transmission leak because there are too many leaks. What can I do so the mechanic can find the leak(s)

    Reply
  15. I didn’t know that your transmission may be leaking if the fluid line has been cracked by debris on the road. My uncle has recently mentioned that his driveway has been getting stained by red fluids that are coming out of his car, and he needs to fix the problem before he goes on a business trip. Maybe he should consider finding a transmission service to help him repair his leak.

    Reply
  16. How much is starter motor, ignition switch, and automatic transmission pan,for Toyota sprinter Lx saloon 1995 model.

    Reply
    • Call autozone pep boys and advance auto for prices on parts by year make and model of your car and have a mechanic replace it if you can’t DIY. It’s less expensive

      Reply
  17. I have a 2008 Chevy Silverado 1500 4×4 it just started leaking transmission fluid in the front of the transmission what could it be

    Reply
  18. I have a 2003 Jeep Liberty it has transmission fluid leaking and bubbling out from under the cap? Is it my cap or is the pump going bad or just low on fluid?

    Reply
    • If you’re comfortable doing this, you could probably crawl underneath and spot the source of the leak. Otherwise, you could take it to a shop and have them throw it up on a lift. I bet they will be able to spot the source pretty quickly.

      Reply
  19. I have a 2006 GMC Envoy Denali. I recently bought this SUV. It ran great all fluids were fine. Come last week the transmission was slipping. My husband checked the fluids and it was almost dry. We filled it and and about 3-4 days later it was down a quart. We have no puddles and see no dripping. However we have noticed about 2 days ago that some fluid was on my back hatch door. I took the car to a mechanic (who doesn’t work on transmissions) he said it was wet where the dopstick underneath is. He said there is a seal there, he tightened the bolts to the pan. Im hoping this all works. I have an appointment with someone who does work on transmissions next week but I just wanted some sort of answer today. The mechanic today said the problem is probably my transmission. I was more hoping it was just the pan or a seal or something a little less expensive. Any thoughts?

    Reply
  20. I have a 1 ton 454ci chevy RV. Fluid has been leaking from a 1/4 inch rubber hose on the drivers side of the trans. I keep adding fluid and it takes about a 1/2 pint per thousand miles. Why is this happening? The fluid blows back on the driveline when traveling. Thanks!

    Reply
    • Perhaps the hose is just old and gave up. I would have that hose replaced. While you’re in there, check to see if any other hoses are old and will need replacing soon.

      Reply
  21. I have a 2002 Honda Accord that I just bought a few days ago and noticed the day after that it was leaking. I took it to several mechanics and found that it was the transmission fluid leaking because of the reddish color. Two mechanics said they would have to remove the transmission to work on it and had one give me a quote at $680 and another for $800+. Is this reasonable?

    Reply

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