Puddle Under Your Car or Truck? How to Diagnose Transmission Leaks

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Is there a dark red, strong smelling puddle under your vehicle? It might be automatic transmission fluid! If you suspect your vehicle is leaking transmission fluid, check out this video to learn how and where to look for the leak! Len shows you all of the most common places for ATF to sneak out of your transmission, and tell you how to fix it! He'll also show you the right way to check the transmission fluid level!
Check out this playlist for more diagnostic tips that you can do in your driveway!
• Driveway Diagnostics!
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⚠ DISCLAIMER:
While 1A Auto strives to make the information provided in this video as accurate as possible, it makes no claims, promises, or guarantees about the accuracy, completeness or applicability of the content. No information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. All do-it-yourself projects entail some risk. It is the sole responsibility of the viewer to assume this risk. 1A Auto is not responsible or liable for any loss damage (including, but not limited to, actual, consequential, or punitive), liability, claim, or any other injury or cause related to or resulting from any information posted in this video.

[@1AAuto]

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[@kalelty3536]

You all prolly dont care at all but does any of you know of a trick to get back into an instagram account?? I somehow lost the login password. I would appreciate any tips you can offer me

[@davidfalcon6507]

@@kalelty3536 😊

[@renegadetherapper]

Thank you for saving us hundreds on diagnostics from scummy shops that think it costs $300 to look under a car and go “yep, that’s where that’s leaking from” you rock dude

[@rafaelcarrillomejia5421]

I will by my truck's parts here since you give us good tips

[@1AAuto]

+Rafael Carrillo Thanks for checking us out!

[@chief2632]

I've bought plenty of parts from them, they have always been exact fit and never had any issues

[@hereford89]

I love this channel and their products. Very informative. Y'all should collab with Scotty kilmer lol

[@adam816]

I thought Len, (Lennys?) explanation was simple and easy to follow. He had a good speaking voice, delivery, and sincerity in his tone. Storytelling ability is so critical these days so I'm thankful for people like this.

[@tatankagarcia1570]

You make things so easy if only my leak is not a bigger issues then expected. Thank you for your information kinda relives me of a little stress how simple you talk about it

[@nikovandh]

The educational videos are great. Thanks for continuing to make them!

[@1AAuto]

+Nicolaas Van de Houten Thanks for checking us out! 1AAuto.com

[@jessicalyn1079]

By far the best straight to the point and thorough. Thank you!!!!!!!

[@marionrojas818]

This was very informative

[@COWASOGGY]

"Veerickle". brilliant.

[@makreacts3494]

Got a 2000 Ford Excursion, V10, 6.8 beast on 4 inch lift kit. Just fixed my return hose line then she started leaking trans fluid and started to whistle. This vid confirms my diagnosis. Awesome

[@hafunland894]

Very thorough helpful video!!!! Excellent job guy!!!

[@vinnycostanzo7019]

Your a great teacher, thank you!!!

[@therealrobo]

Thanks man, I changed mine out today cause of your video!

[@rdp919]

Thank you for this, most informative video I've found on this issue!

[@1AAuto]

+RDP Thank you! We love empowering our customers and showing how to perform DIY auto repairs with our high-quality auto parts. 1aau.to/m/Shop-1AAuto-c

[@israel7294]

Appreciate these detailed videos

[@kristoffermiller4401]

Fantastic video man. Thank you!

[@meganw6007]

Thanks for all this great information and the tips

[@brothermuhammad8263]

Excellent job!!! Thank you sir!

[@1AAuto]

+Brother Muhammad Thanks for checking us out. Shop for high quality auto parts on 1AAuto.com: 1aau.to/m/Shop-1AAuto-c

[@dustybrown5610]

Great video keep them coming!!!!!

[@voidofmisery4810]

What about the vent that is a spring loaded vent? I just replaced my clutch and I’m now having transmission fluid leak from this when I try to put it in gear

[@toneywilliams4795]

Great video and thanks for explaing everything clearly.

[@lightskinnryka8513]

I love the way he says “vehicle” ☺️

[@bernhardk7720]

Thanks, great overview. However; Breather vents/tubes? You forgot to mention I think a loose sump plug (part of the pan but a separate item at the same time).

[@1AAuto]

+Bernhard K Thanks for the feedback!

[@kurtcobain9345]

Very helpful and great explanation

[@1AAuto]

+Darth Maul Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c

[@r0d0lfita]

Loved this video!!

[@Cmhhh9]

Thank you so much!!🎉

[@micahfrye8885]

This guys hand movement are crazy I’ve never seen someone do it that much

[@BH-je8ej]

He's on a sick 1

[@dwho432]

Who cares

[@valentins113]

Very professional information.

[@1AAuto]

+Valentin Saucedo Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c

[@KenanOlivier]

Awesome! Thx for this video, it helps a lot!

[@1AAuto]

+Kenan Olivier Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c

[@marx769]

Thank you!

[@user-dl3hn3yd8u]

Believe me i give youThumbs Up before watching videos always

[@1AAuto]

+أبومنصور المنتصر Thanks for checking us out! 1AAuto.com

[@KPrayfortheworld]

Thank you sir 👍👍

[@lifelongpercussion_]

love your videos

[@tonybrown9875]

Really good video.

[@gameboychris15]

Great video btw

[@bertabrambila9820]

Love your videos...

[@visalvisal9694]

Gear oil checking engine idling or off condition?

[@ralstondad]

I've got a 95 Dodge B2500 van. The transmission coolant line on the passenger side is slowly leaking where it connects to the radiator. Problem is, I cannot find a replacement for that line. Anywhere. Only one I can find is the driver's side.

[@josiahbunton8092]

This was perfect

[@grantp4022]

I have a 97 Chev Lumina, and I just changed the battery, and it was sitting idle for 1.5 years, and did not drive it. Changed the battery today, everything was great, all interior lights went on, and she started on one crank. Took if for a drive, and noticed this red fluid dripping out badly from under the car. It wouldn't likely be power steering fluid, as you would get whining from the pump when low on fluid. It's sort of reddish fluid on the ground, and smells a bit oily, and has a bit of body to the fluid. After driving it for 5-6 miles and not knowing it was leaking until I was about 3 miles into my drive, I turned back and headed for home. As I got closer to home, and it was still leaking, it had "no power" whatsoever. I pretty much had to coast about a city block to get it to my house, where it's now parked. It is a rust bucket, but only has 50,000 miles on it, and it's a great utility car, for picking up building supplies etc, and I'd like to keep it. When I took it for a ride, it shifted smoothly etc ??? So, I was thinking, I could get lucky, and it may be leaking from the transmission cooler lines, as your video explains ? I think these lines wouldn't be expensive. Also my big leak, was coming directly from under the radiator, so it makes sense, Also the leak could be coming from the drain plug, at bottom of transmission drain pan. NOTE - this leak is coming out fast and steady, creating a pool on the ground fast. Maybe I'll get lucky :) and hear back from you as to what this likely is ?? If it was just leaky seals or gaskets, the fluid wouldn't be heavily squirting out. It would slowly drip out -- I would think.

[@jjsquire706]

🙋This video is super awesome and way past cool. After installing a new automatic shifter cable on the Hummer H2 I now have this strange leak I've yet to figure out but with the help of this video I should be able to narrow it down to a couple of places👍😎👌

[@jjsquire706]

Turns out the leak was coming from a pair of rusty transmission cooler lines. Went to O'Reilly's auto and purchased some replacement hose along with some adjustable metal clamps then I cut off the bad part of the cooler lines to bridge the gap with the new hose. Worked like a charm at least for now anyway.👍😎👌

[@kellyballaro7846]

Great Video - Thank You!

[@1AAuto]

+Kelly Ballaro thanks for checking us out!

[@scootchie]

Great tips

[@budsodalsky]

Thanks 1A Auto

[@1AAuto]

+@budsodalsky Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c

[@clintonwalker9502]

I love 1A Auto

[@bakerke1]

Great video

[@Don_Latino]

1A Auto Parts my car don’t go into gear 4 and 5 and i diagnose the transmission and computer was telling me that those solenoid is bad, can this problem stop after changing this? Please i need your advice thanks

[@norbertocastillo8551]

🎄 you are my guy Merry Christmas

[@mattieice2988]

Hey Brother Hands down the best video ever love good people like you, now i pray to God the shop doesn't tell me i need a brand new transmission 2011 Kia Sportage with only 30k miles i want to think positive, but unfortunatly there are scumbags and scamers out there, but you soild love and upmost Respect The Pryor Family 👍👍

[@israeloladipupo6264]

Good video

[@shawngram1991]

Thank u so some

[@jeffweaver955]

VEERICLE lol. Great video!

[@HunchedOverman]

Great video I’ve noticed with my Fj cruiser 2016 that when I go from drive to neutral (short while after starting the car) a shirt but distinct wine ... just wondering if you have any thoughts on this A1 Auto? Thanks

[@HunchedOverman]

P.S. 20,000 miles on it 😩

[@zacharycampbell9880]

I'm currently having this problem with my 2006 ford ranger and I had to get it towed but now I know why thank you!

[@user-yj4gv4dq4n]

Fixed it?

[@laconiaautos7770]

Could one use a UV dye to detect the leak? It will be the type of dye similar to what mechanics use in detecting engine leaks.

[@lo-k3ydapoet327]

Very informative.........

[@1AAuto]

+Lo-k3y Dapoet Thank you! We love empowering our customers and showing how to perform DIY auto repairs with our high-quality auto parts. 1aau.to/m/Shop-1AAuto-c

[@michaellewells5795]

Exactly.

[@rcnmasterplumber]

Thank You For The Walk Thru

[@shemikawilkins1218]

So what if I ran over a sharp item on the freeway- and it punctured something underneath which cause red fluid to leak out? Any general part name that could be compromised so I can know exactly what I'm looking for that will help me narrow down what part/parts maybe damaged?@1A Auto

[@lulustephenson7687]

This video was very interesting but I’m still at a loss with my BMW. I have a reddish-pink colored leak at the front of my car, just behind the engine. If it matters it’s a BMW N54 straight six engine. Am I safe to assume this is also an ATF leak or could it be something else? The car is a project car and has quite a few issues. I also have a spongy brake pedal so I was thinking it may also be brake fluid. Any suggestions are welcome!

[@alexvillalobos7137]

Transmission fluid is usually pink coolant can be but isn’t as dyed as gravy fluid and different doesn’t smell feel the same. Brake fluid is pretty clear yellow like

[@foxuae03]

Thank you 🙏

[@1AAuto]

+FoxUAE03 Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c

[@crbourret]

Does it make any difference if the transmission is in Park or Neutral when your checking it with the engine running?

[@caydenthompson1878]

Check your owners manual or some even have instructions on the trans dipstick

[@Spartacus4000]

Lol love how animated his mannerisms are... quick question: .. i bottomed out my 2015 nissan sentra now the pan leaks and the car vibrates significantly when in gear.. any idea what exactly coulve happened? Aside from the the pan (big dent on it)

[@MaxMol1]

Ty Boss

[@simplelangperorock]

awesome.

[@kyleheadrick4947]

My truck is a 95 f150 5.0l v8 it's a stock transmission and it has a square block for the tail housing but I have no idea why it's still leaking with new gasket on pan and still leaks in the back of the pan with new pan and gasket as well as new bolts. What can I do to fix it and is there a gasket or seal above the leak

[@troyventura6717]

Does this work for any kind of car for insurance a 2008 Chevy impala

[@lightning8180]

How much does a rear transmission seal replacement cost for a shop to do for u?

[@BrianJohnson-tz6xl]

If you put too much fluid would that be a reason also ??

[@user-iz9oj5ko7e]

Danks 😂

[@JJ-pj9lb]

I always get my parts from A1 Auto my local auto store had parts that I needed for over $800 at A1 Auto I got them for $270 and that was with delivery!

[@1AAuto]

+J J Thank you for your order! We'd love to hear about your experience. Here's a link to leave us a review on Google: goo.gl/i5JFNY

[@goldanddiamonds7240]

China

[@zionwoods6301]

How do you change the Bell housing if it’s leaking from that area

[@ponylion7644]

Fabulous video 😻

[@captainpapi3370]

Len i so dreamy lmao

[@VerticalSpeed1987]

I need to check my verickel.

[@GunninWizard]

my 2010 chevy equinox doesnt have a trans dip stick, how can you check it?

[@siobhanmcknight1127]

I have a 2004 Honda Element with a really bad oil leak. I’ll pour transmission fluid in but the entire bottle will leak out in no time! I was told the only problem it has that needs to be addressed is the relay? Someone help me please

[@modusbee9092]

Cool

[@ronaldsteveson76]

What about the dipstick tube? Mine is pouring but just sometimes 😕

[@Chrisbreezy1979]

What if I park then the next day there’s all my transmission fluid on the ground dripping all over the cross member under the pan

[@cantiflascantiflas8460]

I left my truck sit for 4 days then I saw it leak today, I’m over here thinking someone messed with it

[@dwho432]

@George how much

[@frutosk]

You hit something? Happened to me on me jeep. 3 days later I look over and tranny fluid everywhere

[@adelt6946]

Very helpful.....10k like👍..

[@two4flinching579]

Are you saying verical? Or vehicle ive watched 2 in a row and it sounds like that. Lol but i appreciate the help

[@user-xr1ls4zt5x]

On my 2002 2.2l engine on a Pontiac Sunfire se my transmission leaks start to leak when is car started but when car is off it doesn't leak what to look for

[@willjerry9950]

Nice video don’t know if I could listen to you say vearicle one more time though

[@moneybarksdale1817]

I paid 95 dollar's for a radiator on my range rover with 1A auto got it in 3 day's plus new in the box...note everyone else wanted 400 - 600 dollar's I chanced these guy's and stayed with them since 2016

[@1AAuto]

+Money Barksdale Thank you! We love empowering our customers and showing how to perform DIY auto repairs with our high-quality auto parts. 1aau.to/m/Shop-1AAuto-c

[@FSHNKNG]

But what would cause a leak in the bell housing and how can you fix it?

[@ralphmaignan8031]

I gotta question my diff went out and then I had transmisssion fluid after why is that?

[@shotgunscott]

Most vehicles have sealed transmissions, so there's no dipstick to check anymore. 😢

[@TheValdez818]

Wife hit something not sure what but now car is leaking pink fluid not sure what it could possibly be coming from assuming power steering?

[@octiman2997]

i got the D drive light blinking and got engine check.

[@namelessandsouless1]

I have a leak that's close to the from of my truck (98 ford expedition), parallel to the wheels, but I'm just stumped as to where it is.

[@1AAuto]

+Namey Lessone We wouldn't be able to diagnose an issue like that here, you may want to have a local mechanic take a look at it. Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c

[@chicagocrazy5740]

You lost me on on the output seal and then saying internal seal… what’s that part called? My truck is leaking between the transfer case and transmission. Due to my rear shaft falling while doing 70 mph damaging my fuel line and that…

[@elijahhoerner6827]

I currently am facing an issue with a transmission leak. I have a 2004 Chevy Silverado 1500 w/ a 5.3. My check engine light flashes when my rpm’s go higher and struggle with accelerating. But when I let off the throttle the check engine light goes away. Plugged GM scan tool into it and it said p0300. Changed plugs, all 8 coils and has coil harness on both sides. It’s been a real pain trying to fix this issue. It’s been at 3 shops and they say it’s a transmission issue but one said it could be a bad clutch or valve body. But I’m not sure if a failing valve body would make the engine to misfire. Thanks and let me know!

[@1AAuto]

+Elijah Hoerner We wouldn't be able to diagnose an issue like that here, you may want to have a local mechanic take a look at it. Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c

[@martinwilkins3854]

Check your fluid hoses!

[@sublingualsidekick]

Hi, my 04 Silverado temp gauge is fluctuating and I have a transmission leak, both started at the same time. Gotta diagnose the leak still but could these be related? Perhaps fluid is landing on thermometer and messing with it? 1AAuto is a friend not a company, to me. Thank you

[@1AAuto]

+AJ J We wouldn't be able to diagnose an issue like that here, you may want to have a local mechanic take a look at it. Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c

[@sublingualsidekick]

@@1AAuto Thanks for your reply. I won’t ask for a diagnosis but I’m thinking it’s coolant from the thermostat housing. It’s the highest point where I see fluid and I don’t see anything coming from the water pump. Is there a gasket in the thermostat housing? Is this a logical place for coolant to leak? Thank you.

[@kaseygarcia]

I have a 2wd and my fluid is disappearing no leaks where could it be going ?

[@tyrinkeith5566]

He look like he's by the book

[@manuelpichardo2313]

How can I change the tail seal ?

[@ryfel99]

He's just messing with us right? Saying vehicle as if there's an 'R' in there?

[@RealRedDragonn]

Wtf I almost can’t watch this 😂

[@freedomthrower4911]

Verhicle right? 😆

[@kendtchileninjah5905]

Veericles

[@lightskinnryka8513]

He obviously 🙄 has an accent , probably Irish or Scottish, but I have my money on Irish

[@Tyrant96]

Think Its His Irish Roots Hahaha

[@hubertpereira6778]

What’s that rubber seal under the transmission?

[@kevinfontenot1107]

Question My transmission leaking but when I check dipstick it shows full. Why?

[@OnTheWater0088]

My vehicle is driving properly I just have leaking in multiple areas any know what’s going on??

[@pedrodejesus9783]

If the transmission is liking under the vehicleit could be cause there is too much fuiid and cause causing no reverse do I have to chance the transmission or reconstruction of it?

[@clitlicker69]

buy a new transmission