Common Transmission Problems: The Transmission Leak

June 2, 2022 | By Mister Transmission

Common Transmission Problems: The Transmission Leak

One of the most common problems people tend to experience with their transmissions is a fluid leak. Luckily it is also one of the most straightforward fixes if caught early and fixed promptly.

Continuing to drive a vehicle with a transmission leak can cause further damage, so tending to leaks asap is integral to your car’s lifespan and overall health.

The key to maintaining the life of your vehicle is routine transmission servicing and checking your fluids monthly.

Say you’ve done all that, and there still seems to be something amiss with your transmission. How can you tell if there is a leak?

How To Tell If You Have A Transmission Leak

There are a couple of apparent indicators that you have a transmission leak.

  1. If your vehicle is slow to start moving, that can be a sign that your transmission needs servicing or that it has a leak.
  2. Keep an eye out for puddles underneath your car. If your car recently underwent a fluid change, the fluid will be clear and red. If you haven’t had it serviced in a while, the liquid will be opaque and smell terrible.

If you notice either of these issues, get it fixed at once before they create even more significant problems that require additional repairs.

What Causes A Transmission Leak?

As important as having your vehicle routinely serviced is to understand what causes transmission leaks so you can try and avoid them.

The transmission pan is often susceptible to dents, holes or rust that can cause leakage due to its exposure to road debris. These leaks can often be too small to spot and may take a while to identify. This makes them problematic, as all too often, drivers continue driving, unaware of the leak.

Drain plugs can also be elusive leak sources as loose plugs and overtightened plugs can cause leaks. 

  • Broken seals can and often are the source of the leak. There are many areas where you can find broken seals due to wear and tear. Some of the most common ones are:
  • Input shaft
  • Axel seals
  • Transmission pan
  • Plug seals
  • Sensors
  • Shifter housing seal
  • Valve body
  • Tail housing seal
  • Speedometer seal


  • A busted pan gasket could also be the source of your leak. It’s not unheard of to experience this as it can be caused by lousy gasket alignment, poor manufacturing, or exposure to high temperatures.
  • If your torque converter is cracked or broken, this can cause leaks and prevent transmission fluid from flowing through the rest of the system.
  • A cracked fluid line is rare but can happen. Typically, exposure to extreme temperatures or damage from the elements can cause this.

How To Fix A Transmission Leak

The first step to fixing a transmission leak is to determine where the leak is coming from. This can be a lengthy and tricky process if you are not particularly experienced with car DIY. It might be a process that is better left to your neighbourhood Mister Transmission.

Book a Free Road Test and Multi-Check Inspection, and we can perform a fluid check, road test, and a Diagnosis Scan to help determine your car’s needs. From regular transmission services to total transmission overhauls to fixing leaks, Mister Transmission is there to help.

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Customer Reviews
I went in and dealt...
Troy Langevine
I went in and dealt with Gus. He provided options, clarity, and honesty. He communicated and provided updates. I strongly recommend him and his team for your repair needs. In the climate of "everyone trying to gouge you", he was honest, trustworthy, and reliable. I strongly endorse him,. Thank you for everything.
Date: November 19, 2022
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I would like to commend...
Bob Thomas
I would like to commend the team at this location for their tremendous service when I contacted them for an fault. They diagnosed the problem and corrected the problem with my water pump cooling system. Very impressed with courteous and helpful response from Ray Sanchez. I will definitely go back there.
Date: November 19, 2022
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Very professional and polite. Travis...
Very professional and polite. Travis and Jenifer are great. Highly recommend this repair shop they treated us like family.
Date: November 18, 2022
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Great service!
Holden DeGroot
Great service!
Date: November 17, 2022
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We own a Fusion 2010...
Bob Wong
We own a Fusion 2010 V6 AWD. Recently, the TPU sprung a leak and instead of having to purchase a new one as TPU can be an expensive item, Wes recommended to re-seal it. He and team rebuilt the TPU with a seal kit, and did a great job! Unfortunately, upon getting our vehicle back, we also noticed a big puddle on the floor when the car parked overnight in the garage. So back to the shop we went. Wes informed us that we had a different leak on the left-hand axle seal. Wes was honest to show me the bushing/seal in that the leak came from a different part, not from the TPU so we know we were not scammed. They fixed the problem within a day!!!. The staff was very kind and even gave us a small discount to cover the multiple taxis rides and a limited edition Mister Transmission lanyard for the key!. In the post-covid environment, we seldom encounter such a positive customer experience (including brushing off the overnight snow with a smile; which was so impressive!). Wes, his partner, and the crew are professional mechanics and deserved the praises. We recommend the business to the family and friends, you can trust this shop to take care of the repair without having to second guess their professional opinion - Jim L.
Date: November 16, 2022
Website: Google
After wasting a month at...
Mario Freitas
After wasting a month at Jim Pattison Hyundai to finally get quoted option A (5k$ for a refurbed transmission) or option B (8k $ for a new transmission), I opted for C take it to a known and trusted expert Mr. Transmission in Whalley. I dropped my vehicle off in the morning and had the transfer case replaced and vehicle ready for pick up by 3:30. A mildly used transfer case was installed and tested and let's just say the cost was no where near the options I was quoted at JPH. I highly encourage anyone with transmission or drivetrain issues to come talk to Mr. Transmission. These guys are pros.
Date: November 16, 2022
Website: Google
I came by yesterday, November...
Rafee Syed
I came by yesterday, November 14th with my 2017 Chevrolet Suburban which gave me issues that day and the day prior with regards to a slipping gear. I was unsure whether to goto GM again as they had just worked on it in June and I had trust issues regarding some other issues in my truck. Seeing the great reviews I decided to come here and was greeted by Jennifer, who was very nice and took all the requisite info. I ultimately did not get my servicing done here (I had a warranty with GM on the work done in June) but I will give 5 stars due to the honesty of this business. Jennifer called me after the free diagnosis and told me before they do anything, I should inquire regarding a warranty on the job done as it did not exceed 20,000km since the work was completed in June. She advised to go speak to GM and if there isn’t a warranty they will happily look at the truck. I had discussed earlier with my friend who had an issue with his vehicle that we have a hard time trusting most mechanics due to the many vultures we have come across. In my situation it would be easy for any mechanic to go ahead and make the buck off me, however Jennifer and their team are a gem in this industry and looked out for my best interest. I highly recommend them alone for their honesty and will recommend them to anyone of my friends who ever have an issue with their car. If I don’t have a warranty covering my truck I will for sure be back to Mister Transmission if there is a problem. Thank you Jennifer and the team!
Date: November 16, 2022
Website: Google
The gentleman at the desk...
Julianne Spence
The gentleman at the desk was so extremely helpful! We had an issue and he was so helpful !! We are so grateful for this wonderful customer service!!
Date: November 15, 2022
Website: Google
I thought I was having...
Brendan Hellrung
I thought I was having transmission issues but they were able to quickly diagnose the actual issue. Phil was quick and communicative and able to get my vehicle back on the road by the next day. Overall great service!
Date: November 15, 2022
Website: Google
The guys were very knowledgeable...
Lenore Snell
The guys were very knowledgeable about the repair of my differential on my truck. It was done in a very professional and timely manner. Much appreciated. I would highly recommend this shop to anyone in need of repairs to their vehicle. Bob Snell
Date: November 13, 2022
Website: Google
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