Transmission Temperature sensor replacement: Yukon, Suburban, Silverado, Sierra 8L90 8 speed P0711

Transmission fluid: Must use this kind for the 8L90 8 Speed! You will need about 8-9 quarts amzn.to/3sGD8dk
Harness: 24298757 (most Dealerships have it on backorder since its new. Took me a week to get one they ordered from Michigan.
Transmission oil filter TF922 amzn.to/3pz30WI
Fluid pump www.amazon.com...
Reset Check engine light • How to turn off check ...
Yukon playlist here • Yukon / Tahoe / Suburb...
If you have to drop the valve body see TruckNerd’s video here: • P0711 Silverado Sierra...
The concepts performed in all videos from Danny Johnson are for demonstration purposes only and are not guaranteed in any way as I am not a certified mechanic. The viewer holds the responsibility to research these procedures and perform them at his/her own risk.
Due to factors beyond the control of Danny Johnson, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. Danny Johnson assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Danny Johnson recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of Danny Johnson, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not Danny Johnson. Always take proper safety precautions, including, but not limited to, wearing safety glasses, removing jewelry, properly securing the vehicle on jack stands, etc.

[@Handyguy223]

Big Thank You sir. I know I'm late to the party but I just did the whole shebang on my 2015 Sierra. Your video made it so easy to follow along and gave me that extra bit of confidence that I wouldn't inadvertently destroy the transmission. 😂 ✌️

[@dannyjohnsonsgarage]

I’m glad you found the video. I would also look into the AFM range disabler as it also helps protect the transmission. I have a full playlist on this suv, so feel free to see it as well Yukon / Tahoe / Suburban / Escalade Owner’s manual Bells & whistles kzbin.info/aero/PLIjr-uSYDZi7J7EQ1ErTn1Yzi6ET_3Ssr

[@Handyguy223]

@@dannyjohnsonsgarage I'll check it out, thanks.

[@w.z.c.1880]

I would like to add a piece of information for anyone who might be running into the same issue. Though it is difficult, it is possible to mix up the last two wires that are on either side of the pink plug at the front end of the transmission. Especially at night when you just want to be done. If you switch them, you will not get a code, you will get perfect pressure and temp rise, but your symptoms will be hard one-two shifting, and nonexistent or late fourth gear shifting. I hope this helps folks understand that it was two wires being switched, not something wrong with your transmission. Thank you so much for the video! The information was absolutely invaluable!

[@Chrismckinney1]

Yes this definitely is helping me I haven’t started yet but I think this may be my issue. I just bought my Tahoe with 93k miles and I’m unsure if this issue has been addressed before, but I’ll take the low end and go in and change the oil and filter as well and under there I’ll check the connections. Thanks a lot for mentioning that 👍 by the way are you a GM technician

[@wisin1988j]

Good video in 21 gmc sierra 2.7 my transmission just started running hot took it to the shop didn't find anything wrong. Had another shop tell me this didn't believe at first but good info so what he said it was a bad temp sensor but they would not sell them separately. Till this day i have not done any of this repair but surely looking forward on this.

[@dennisc7448]

Thank you! This video helped me a bunch. After I was done, I found that this maintenance is now covered by the dealer for free if your truck has less than 120k miles.

[@theyoungkickass]

How did you find that out? Is this still true? I just rolled 110k and the code came up a few miles before that

[@CantrellFamilyMusic]

Is this true? I just have 116,000

[@jaserWD]

Really appreciate this video post. I had the P0711 code. Reporting here that, per my local GM dealership, the harness part number has rolled to 24046895. Sry if redundant info! I also installed the Shift Technology Products STL010 kit in place of the stock trans cooler thermostat valve, and all together, with fresh fluid - this 2017 Sierra 6.2L with 8L90 no longer has the hard shift and temps are stable and have not risen above 125degF. Wish I had done this when brand new…

[@chrismahoney5692]

Thank you for this ! The local stealership quoted me $6,500 and insisted that the valvebody had to be dropped. They claim this new part doesn’t exist!

[@dannyjohnsonsgarage]

Wow. I’m glad you found the video.

[@chrismahoney5692]

@@dannyjohnsonsgarage question- gm shows this part 24298757 has been replaced by 24046895. Any idea what changed ?

[@emmanuelgomez5706]

@@chrismahoney5692 contacted gm too. They gave me that number

[@kameronh9100]

Thanks for the video. It was very helpful. I just did this on my 2015 Yukon XL Denali. I got the P0711code about 3 years ago, reset it and never came on again until last week. Reset it again and sure enough it pooped back on. Even though my Yukon is still under the extended warranty my dealer didn't have time to get me in before a planned road trip. The wire harness, fluid and filter came to $220.86. Would've been cheaper to order online but time was of concern and the dealer had all parts in stock. Hopefully this did the trick.

[@Chrismckinney1]

If I may ask, 1 year later did this fix the trick?

[@kameronh9100]

@@Chrismckinney1 Yes, never had the issue again. Funny this just came up because I just traded the Yukon in yesterday for a 2021 Yukon.

[@erniemccracken492]

Great video, and thanks so much for making it. A couple of takeaways from my recent experience with this: On the Silverado, prying the exhaust away from the pan was not necessary. A little wiggle and the pan came right out. Was surprised when only got six quarts to drain out. I thought it must have been underserviced last time, so I added seven. After warming the fluid and pulling the check plug, about a quart came out, so that was the correct amount. I understand the need to try and keep things clean, but the new pump for the new fluid seems like overkill to me when considering that with a pan drop, you’re only changing out less than half of the system’s fluid capacity, so I don’t feel that the residual “dirty” fluid in the pump would hurt anything. Once again, thanks. It was tremendously helpful.

[@dannyjohnsonsgarage]

Thanks for the feedback. I’m glad you had a successful oil change

[@AD-ds3sd]

Great video! My 2016 Escalade had the temperature fluctuating a few weeks ago and also started shaking when accelerating at around 65mph when it was below 1500 rpm. I actually received a letter from GM that my car may have this problem, but in order for the dealer to fix it free of charge, the error code needed to be present or the check engine light had to be on. Since my car didn’t present none of those. I was left with the only option. To do it myself. Your video helped me fix this issue thanks again!!!!

[@dannyjohnsonsgarage]

Sometimes it’s better to do it yourself and control the quality and not be dependent. Great job. Glad the video helped

[@emadbaeira2367]

Hi what was the code that you had on The Escalade

[@AD-ds3sd]

@@emadbaeira2367 that’s the thing, it didn’t throw any codes. That’s why the dealership didn’t want to fix it under warranty even though I received a note from GM regarding the issue. The dealership told me if the car doesn’t give an error code or a check engine light, General Motors won’t reimburse them. I even called GM they told me the same thing, even after I sent a video to them showing the temperature fluctuations going from 140 to 80 degrees.

[@emadbaeira2367]

@@AD-ds3sd I see my temperature Monitor going from 115 to 60 then jum back to 130. I had the light on 3 weeks ago and my mechanic Erased it. Car is acting up. I'm just going to change it tomorrow on my own. It's going to coast me 250$ total. If you ever get a cold record will be p0711

[@emadbaeira2367]

Belive it or not. I BOGHT BRAND NEW Transmission from GM and it's under 20000 mile and I have this problem already

[@WingsAA]

Appreciate you posting this. I'm not getting any codes but am noticing some minor fluctuations in temp at initial startups randomly before it seems to even out... kind of indicating it's getting ready to happen. Also, planning to change the fluid so might as well kill two birds with one stone. Thanks again!

[@Thatsrich85]

I cannot find this part to save my life!

[@DavidOrtizGTR]

Very informative video brother. My Denali going in for this same issue.. hopefully that solves the issue

[@chrislopez7109]

Hi there, my 8 speed just threw that code. I only have a rough 1-2 shift so hopefully this is the solution will be ordering the parts soon.

[@dannyjohnsonsgarage]

That’s exactly what mine did. Almost felt like the transmission slipped from 1-2.

[@GrinDiesel1969]

Such a Great Helpful Video!! Thank You

[@cwsosby]

This is a a great video by all accounts and am very glad I found it. Was 8 quarts the magic # after the warm up? Update 07/11/22: It went just like the video said it would. I pumped out 6 quarts & put in 6 1/2. Ended up with about a cup out of the overflow after warm up. I was able to manipulate the pan in & out without using a pry bar, but watch your pan gasket. A 10mm ratcheting closed end wrench will be your friend on that heat shield. So far so good on performance without the clunks & fluctuations in the temperature gauge. I should mention the dealer switched the fluid over to Mobile 1 under warranty a few years ago as well. So we’ll see how long this lasts. Once again, thanks for the great content. I’d of never attempted this without it & assume I saved myself at least $500 @ the dealership.

[@dannyjohnsonsgarage]

Yeah, it will depend on how much comes out. You won’t get it all from what’s stuck in the converter and the system. The overall fluid capacity is about double

[@wilsoeric85]

Great video!!! You just saved me money!!!

[@miamiimports4691]

Thank you very informative

[@widespread01]

This was really great! My P0711 is gone along with the harsh 1st to second shift. I'm wanting to change more of the old fluid now without dropping the pan. Once i suck out the fluid in the pan do i put 4 quarts of new fluid or 5 quarts? 15' Escalade. Thank you!

[@dannyjohnsonsgarage]

Yeah, just keep draining and re-filling a few times, adding in what you take out 👍🏼

[@sherylflowers6062]

Great video

[@BoSultankw]

2016 gmc denali 8 speed transmission..we have code p700 & p711 .. thanks for helpful video.. new gm trucks sucks!! I have old 2012 tahoe z71 300k and it’s run better than new denali!

[@dannyjohnsonsgarage]

My 2000 Silverado has no problems and just about to hit 300,000 miles. With a little work these should too, but sad they require some work

[@justaguyandhisdog9328]

Did this fix both codes? My 2016 just got the same 2 codes . A d does warranty cover this?

[@BoSultankw]

@@justaguyandhisdog9328 yes it should fix these codes.. the warranty cover transmission till 60k miles I think or 5 years.. ask your local dealer

[@zteeee]

Will it cause damage to drive/tow if this code came on? It came on once today cleared the code truck runs and drives as normal, coolant temps are normal and trans temps are normal.

[@dannyjohnsonsgarage]

Light driving should be ok. I drove around for awhile like that, but I would not recommend high stress, high heat like towing.

[@abdulrahimb.7448]

Hi i have 2016 Sierra with 8L90 i didnt get the Check Engine light or codes got the fluid replaced (used Amsoil) but the temperature sensor was not replaced as per the garage where i did the fluid replacement they said the tsensor is fine, however, once i took the car from them the shifts are way better than before but i get the transmission temperature readings are fluctuating suddenly between the range ( 95F - 154F). Wondering if the sensor has failed or this is normal?! @Danny Johnson’s Garage

[@dannyjohnsonsgarage]

if the readings are all over the place it’s most likely bad. GM is very specific about the oil, so if you have it replaced again make sure to get what is in my video description

[@pilothaney4843]

Manual says to use Dexron VI for the 5.3L but you recommend the high performance? Is there is an issue using the HP instead of VI?

[@dannyjohnsonsgarage]

I believe a TSB was issued for the 8L90 transmission to use the HP due to torque converter shutter

[@pilothaney4843]

How do you know if you need the one piece or the 2 piece wiring harness? I have a 2016 Sierra 1500 with 5.3L gas and 8 speed transmission

[@dannyjohnsonsgarage]

To my knowledge they came with a 2 piece harness and it is easier to replace only the bottom half as shown in the video. You may not know until it’s apart or perhaps a dealership can tell you by your vin

[@morganlively2517]

Part number for pan gasket?

[@geovannycoello5516]

Thank you for the video Sir!! Much appreciated. I have question after I replace the wire harness and the transmission filter, what should be the correct transmission temperature reading on the gage dashboard? 175 to 200? Any help it will be greatly appreciated

[@dannyjohnsonsgarage]

Yes, at or below 200 is normal. I have some documentation for when I was towing in hot weather as well kzbin.info/www/bejne/bIfdiWqoermNf7ssi=JUIRFCd3GLk5mAmQ

[@geovannycoello5516]

Thank you for the explanation and the towing video and your fast response! Have a great day and once again sir thank you!!

[@CantrellFamilyMusic]

I’ve got a 2017 GMC Denali Yukon XL that has just threw a code for Transmission Temperature Sensor. Will this work for me vehicle as well?

[@dannyjohnsonsgarage]

It may be different if you have the 10 speed, but it should be the same for any 8 speed. You’ll have to see which harnesses are available and if it’s just the lower part of the harness you need to replace

[@emadbaeira2367]

Does the temperature sensor comes with the hornet or it comes one piece. Any idea how much it cost by GM. So code p0711 is the problem ? Also how long can you drive on bad TMF Thx

[@chinof3]

I replaced the sensor and it made my issues worse than before. My first two gears are shifting very hard now. Any suggestions?

[@dannyjohnsonsgarage]

When it’s up to operating temp (driving around for more than 15 minutes) does the transmission temp still register zero when you push tow/haul? If the temperature sensor is working properly, it may be the transmission clutches themselves

[@avflyguy]

Great Video and shout out to TruckNerd. You've done a fantastic job of presenting how to do this. I do have a question though. In trucknerd video, it didn't appear he drained the overflow screw with the engine running. Can you confirm which way is correct? Look at his most recent (Dec) video @15:35. It does sound like it's running, but there was no mention of it. That's all I think I need to know. The rest looks 100% DIY Dooable. *Great Job of your video*

[@dannyjohnsonsgarage]

The instructions are to run it at temp and open the drain level plug as I show in the video. He may have measured the fluid and felt it was fine to only add back in what was removed

[@avflyguy]

@@dannyjohnsonsgarage Thank you for your quick reply. I'll let it run at temp till is all but stops dripping. Did your harbor freight hand pump work easily? Thinking that is the route to go!

[@dannyjohnsonsgarage]

@@avflyguy yes, it was a great pump! Also be very careful because the exhaust runs right by it so don’t get burned!

[@dannyjohnsonsgarage]

Pump www.amazon.com/HORUSDY-Multi-Use-Siphon-Transfer-Liquids/dp/B075C3NNZF?crid=2J1TPTBV6ZM4F&keywords=transmission+fluid+pump&qid=1646438914&sprefix=transmission+fluid+pum,aps,133&sr=8-3-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEyRVUwNlBDT1ZVWlpUJmVuY3J5cHRlZElkPUEwMzUxNTkxM0lLQjMyMDk2RzlRWSZlbmNyeXB0ZWRBZElkPUEwOTgzMTIzM0k3RjQzU0hNUkY1VSZ3aWRnZXROYW1lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU%3D&linkCode=sl1&tag=2004047-20&linkId=3f61c27864dde42c5cfa951c281bfe56&language=en_US&ref_=as_li_ss_tl

[@joelportillojp]

Thanks for the video’s I just got this Yukon Denali and thankfully they replaced the sensor under warranty. But you should make a video on the phone charger rest it wont work with my iPhoneX. Do you have this problem?

[@cwsosby]

Haha, I have the same problem with the same vehicle and phone. Place the phone on the charger (before starting or turning on the vehicle) and let me know if it starts charging when you start it up? It works for me and I'm not gonna bother replacing that charger.

[@e.t6716]

Danny great video sir, please need your help - have a 2017 CAD CT6 3.6L , i think with the 8l90 trans. 1. Not sure, how do I confirm the trans type? 2. I have two of the po711 codes, however using your part number I could not confirm if that is the correct harness for my car. 3. Also does my car have a trans filter. Sorry lots of questions, thank you.

[@dannyjohnsonsgarage]

Yes, they all have the trans filter. The best way to verify the transmission is call the dealership and give them the Vin. They will be able to tell you what it has. Then they can also verify the part number in this video if it fits

[@e.t6716]

@@dannyjohnsonsgarage Thank you sir

[@teliramirez3914]

Sweet stang

[@dannyjohnsonsgarage]

kzbin.info/www/bejne/oJvYlaB5qZl7eJY

[@jefffreybrasch8882]

Is the factory harness a one picece or is the factory harness like this two piece

[@dannyjohnsonsgarage]

As you’ll see in the beginning of the video, the factory harness is 2 piece, an updated harness came out as 1 piece, and now luckily they have a 2 piece again 🙌🏼

[@philipbourgeois6768]

I did all of which you and truck nerd suggested and literally best install and break down with the one piece. One issue. When i put the new bottom half of the harness in. I now have roughly 15-20 codes vs the p0700 and p0711 all i did was drop pan change lower harness plugged everything in new filter. Put new mobile 1 fluid as told. And now the vehicle won’t even try to start. Now says service traction control and lists those 15-20 codes for like everything in the valve body. HELP. they won’t clear tried every trick i know. Even re traced my steps. And re did everything to ensure i didn’t miss a plug. Any advice is greatly appreciated.

[@cwsosby]

Dang, did you ever figure this out?

[@cristianeduardo019]

Hey man im doing this work right now but i only pulled out a gallon i see you pulled out 2 containers. I pulled out drain plug and nothing came out

[@dannyjohnsonsgarage]

There isn’t a drain plug, it’s an overflow plug you will see in the end of the video. The way to drain the fluid as the video shows is to pump it out or remove the pan. In the end, replace as much fluid as came out and bleed off the excess as you’ll see in the end of the video

[@cristianeduardo019]

@@dannyjohnsonsgarage i did replace what came out in did not do the excess drain. I did went to try it out truck does not go into 3 gear so i drove it straight back home. Could it be low on fluid or you think i should drop it down again and go back check every connection. Thank you bro 🙏🙏

[@ericphillips628]

Great video! Has this been a long term fix? I currently have the PO700 and PO711. It stays on and goes away for a few weeks, then comes back.

[@dannyjohnsonsgarage]

Still going strong

[@ericphillips628]

@@dannyjohnsonsgarage fantastic. Thanks for the update. I’m hoping this will work and will face me from buying my wife a new Denali!

[@dannyjohnsonsgarage]

@@ericphillips628 make sure to get the correct harness as shown in the video so you don’t have to drop the valve body 👍🏼

[@ali511511]

thanks to you and TruckNerd you are very helpful. i have a question, i have a 2016 sierra denali with 8 speed transmission whaat Harness dose it use? ist the one that you ned to drob the valve body to replace or the one you showed?

[@dannyjohnsonsgarage]

The factory should have used the 2 piece one, so you should be able to get the harness I posted in the video that only does the bottom half

[@ali511511]

@@dannyjohnsonsgarage thanks man that's awesome.

[@ramyahmed5698]

Please answer me after change fluid temperature sensor I checked by computer it's not read temperature oil

[@dannyjohnsonsgarage]

It sounds like something did not get plugged in or you need to drive it for 10 minutes for it to get warm

[@sabooraziziazizi8652]

My car have Sam parablim tanks for your anfarmmishn

[@justinholland7657]

Changing this part out doesn't require an adaptive fast learn ?

[@dannyjohnsonsgarage]

No, just plug it in and go because it doesn’t know anything is different. It just runs how it should

[@justinholland7657]

@@dannyjohnsonsgarage I've seen a few people recommend to do the adaptive fast relearn even after just changing only the fluid and filter. Do you have any thoughts on this ?

[@FormerGorilla]

Good video. I will say though that my 2016 had the same issue and it was covered by the dealer under a special TSB. Fully paid, and our warranty has been out for a couple years. Not sure a 2014 is covered or not.

[@dannyjohnsonsgarage]

Once bumper to bumper is over it would be $80 for a diagnosis and then maybe be covered. In my case I did the repair myself so I could also make a video for others once it’s out of warranty for many of the 2015s like mine

[@bigbottoms55]

Do you know what the TSB number is? I have this problem in my 2015 Sierra Denali, and when I run the VIN on GM’s page, it doesn’t show up under active or expired recalls. Hope they are willing to cover this in Canada.

[@FormerGorilla]

​@bigbottoms55 I believe it was N192291660. I think it was specific to 2016, but might check with your dealer and see if 2015 model years may apply.

[@ltsallwood]

Well after putting in a new wire harness with temp sensor, I filled it up with fluid and attempted to start it so i can drain it to the proper level and it won't start. Brake pedal won't push in, and it flashes some sort of symbol that shows a car with a lock on it. What did I do wrong?

[@dannyjohnsonsgarage]

It sounds like it triggered the passive theft system. Try disconnecting the negative battery cable for a few minutes and honk the horn when it’s disconnected to discharge the system. Reinstall the negative cable and try it again

[@reggieeldrealtor6827]

Hi, Thanks for posting this video. Unfortunately my truck won’t start after changing the sensor. Any suggestions? Disconnecting the battery and honking the horn didn't work. I hooked up my scanner and got 35 different codes. Too many to list. Erasing them didn’t help.

[@ronniecardy]

Will it work for a 6 speed? No codes no temp reading when I push the shift button on the end of gear shift. 2016 Suburban LTZ

[@dannyjohnsonsgarage]

It should be similar, but who knows how the harness is setup for the 6 speed. Maybe find some videos showing it apart

[@HewigIsidore]

The problem with the GM 8L90E transmission is not the Torque Converter or even the Fluid, believe it or NOT. For one, the transmission runs too hot for starters. The transmission thermostat bypass opens up about 194F degrees. Too damn HOT. The AFM System is what’s destroying these Torque Converters in my humble opinion respectfully. When the engine transitions back and forth from 8 to 4 & 4 to 8 cylinders, it significantly increases the TCC Desired Slip Rpm. I suspect GM engineers doing this to reduce vibration through the drivetrain for driver comfort at the expense of the Torque Converter it self. If the programming does not increase the TCC Desired Slip RPM during AFM, the customer would experience noticeable vibration every time the AFM engages. This act drastically wears out the Clutch lining inside the Torque Converter apply piston. The key to solving this issue if your transmission is not to far gone believe it or NOT is in the valve body and turning off AFM. The transmission valve body control the ENTIRE function of the transmission, to include the Torque Converter. There are 3 shift kits on the market that will absolutely eradicate this issue, if the transmission is still in good shape and not too far gone. These companies are SONNAX & TRANS GO I have personally myself installed and 😂combined 2 kits with a SONNAX TCC Kit and Shift Kit at 30,000 miles. I have 85,000 right now. Solved all my issues. Always remember that the Torque Converter Clutch Solenoid, TCC Pressure Regulator Valve and Pressure Regulator Spring is what controls the Torque Converter mechanically and electronically thru PCM to TCM commands thru CAN BUS…. communications.

[@dannyjohnsonsgarage]

That’s great insight. I’d believe it. kzbin.info/www/bejne/mYjEqqyQfLOMiKssi=gwScwKxT8bwd_p6d

[@HewigIsidore]

I very much appreciate that.

[@HewigIsidore]

The Torque Converters on the 8L90 are very strong. Believe it or not, they have a Furnace Brazed Impeller & Turbine Vains, which is something that you only see in a High Performance Torque Converter Application.

[@ramindavani]

So I did not get the part that you said there is a wrong part (harness) as well. So you mean the transmission has 2 temperature sensors? one fits just under the filter inside the pan, but the other one fits inside the valve body? So how do we know which one is the faulty one? I did not know that. Please explain. Also, I do have the same problem on my C7 corvette with TFT sensor (Code P0711). So is the part number the same for my corvette or is it different? because my car has the same 8 speed transmission 8L90. Thank you.

[@dannyjohnsonsgarage]

There are 2 available harnesses you can purchase. From the factory, the transmission should have a 2 piece harness. One piece is on top of the valve body and one under the valve body. You want to replace the bottom harness. If you purchase the “wrong harness” it will come as 1 piece instead of just the bottom price you need. That means you have to remove the valve body to replace the entire 2 pieces. If you purchase the “correct harness” you will only need to replace the bottom portion that has the temp sensor. Check the video description for the other channel who did the “wrong harness” if you want to see how that is done. It is the same 8l90 transmission, but I do not know any differences the corvette would have, so verify part numbers with your dealership

[@ramindavani]

The problem is that with the dealer they dont give you the option to talk to a service technician. every dealer has e few service advisers (AKA know nothing guys). They just ask you whats wrong with your car and they come back after a few minutes with a nonsense and the drealship astronomical fees. Its just straight up stupid. what is bothing me is that this car (corvette) should have specific corvette dealership. Most guys that work in dealerships know nothing about corvettes and that is sad. To be honest with you I dont know who I can trust and ask about what I really need for this car. For the harness that you mentioned someone actually told me that the correct part number is 24046895. So I have no way of confiming this because dealer dont talk to you about the specifics and thats why I believe they do things in the dark to charge corvette owners a fortune. Also, I believe most mechanics dont know what is involved in fixing this issue because they believe the valve body should be removed which is incorrect. As you said the TFT sensor is located at the buttom of the valve body under the filter inside the pan. Just out of curiosity what is the function of the other sensor that sits inside the valve body? Thanks.

[@dannyjohnsonsgarage]

@@ramindavani There have been a lot of revisions on the part so multiple part numbers may work. You just want to look at the harness you are buying and it’s apparent the 2 piece smaller portion over the larger 1 piece that has the large circular plug. When I pull up the part number you listed it looks like it’s just the lower harness and should work as the video shows. The only way to know is doing it and you may run into the corvette being different, the year of the corvette being different with changes. You’ll need to open it up to find out.

[@JoseCastro-tg2ct]

Do you need to disconnect the battery before working and unplugging the sensor ?

[@dannyjohnsonsgarage]

Yeah, that’s a good idea

[@traerox5458]

Will this work on a 2016 Cadillac ats v? With the 8l90. Yesterday came the checkengine light on

[@dannyjohnsonsgarage]

I do believe it’s the same if you have the 8l90. Make sure to get the harness shown in the video.

[@elhalcondelbajio1923]

Hi , Danny ,a question ? I only have a little more than 5 quarts. This is what came out, where is what is missing? is it in the system? Should I fill in with the same amount that I took out?

[@dannyjohnsonsgarage]

Yes, most of it will stay up in the torque converter and throughout the system. Replace what came out, then check the level as seen in the end with the overflow plug in the pan while running and warm. Don’t burn yourself on the hot exhaust

[@elhalcondelbajio1923]

@@dannyjohnsonsgarage thanks!!!

[@davidchapman1986]

In the dash, I noticed your transmission temp was 0, presumably that sensor is what the dash is reading. Was it 0 because it wasn't warmed up or would it read 0 even when warmed up? I have a Foxwell scan tool and its reading -40F for the transmission fluid but my dash reads 125-150. Eventually the Foxwell read 160ish. Makes me think either my scan tool is reading the wrong value, the dash is a different temp sensor on the transmission(not the fluid but maybe the housing?) or my sensor is flaking out but not entirely dead yet. I got a P0711, couldn't clear it until a few drive cycles and then my scan tool let me clear it. Hasn't show up again, yet.

[@dannyjohnsonsgarage]

Yes, it would read 0 and that’s how I knew it was bad as well as the engine code. Every once in awhile it would work, but mostly show 0 and hard shift

[@davidchapman1986]

@@dannyjohnsonsgarage Gotcha, I reached out to my scantool vendor (Foxwell) and it appears to be a bug in their code. They sent me a fix and I can read the numbers. Mine now reads ambient temperature or higher but it seems to take a long time to get up to temp. Took 15 minutes to get near 100 and then another 20-25 minutes to get into the 130 range. Almost seems like there is a thermostat somewhere like in the radiator that is stuck open. I recently had a coolant flush so I'm wondering if its related.

[@hectormarquez9380]

Where did you purchase the wiring harness? Looks like auto parts do no carry it, thanks

[@dannyjohnsonsgarage]

The dealership itself

[@jmenterprise3764]

How do I find out which harness my vehicle has? 2017 escalade 4x4

[@dannyjohnsonsgarage]

The best bet is to call the dealership and give them your vin and ask them the part number for the harness and if there are any updated versions.

[@bernieramirez7999]

Great video! I followed the steps pretty simple. I got everything back together and when I went to start it, it won’t start. I’m getting shift to park message and it’s in park. Any recommendations?

[@dannyjohnsonsgarage]

I wonder if one of the connections from the harness that tells the transmission the solenoid in park did not get plugged in

[@bernieramirez7999]

@@dannyjohnsonsgarage guess I’ll drop the pan again, I hope that’s it. Thanks again!

[@bernieramirez7999]

That’s exactly what happened, smooth shifting now. Thanks again for that informative video!

[@dannyjohnsonsgarage]

@@bernieramirez7999 I’m glad to hear you got it! Great job man.

[@OH3REDFIRESVT]

How do u like that floor jack? I’m in the market for a new one, wondering about the quality

[@dannyjohnsonsgarage]

Toms04 Gt I love it!

[@dannyjohnsonsgarage]

Toms04 Gt I’m not sure if you saw my review on it, but it fits well under my car (but I’m stock ride height) kzbin.info/www/bejne/aYDGimiOorJ-nbM

[@OH3REDFIRESVT]

Cool , I’ll be picking one up , thanks and keep up the great job on the videos

[@dannyjohnsonsgarage]

I think the green one or one of the other colors might even be more low profile as well

[@OH3REDFIRESVT]

I definitely need a low profile one , my 04 gt is on h and r super sports , she’s pretty low

[@ohmah420]

how do u find out if u have the one piece sensor or two piece

[@dannyjohnsonsgarage]

A dealer may be able to confirm by VIN. I’m not 100% certain, but it sounds like they are all originally 2 piece harnesses unless it’s been repaired or possibly assembled during the time they had the 1 piece harness available.

[@jchdez100]

Great video, what model its you truck ????

[@dannyjohnsonsgarage]

2015 GMC Yukon Denali

[@ltsallwood]

Is there a way to know if I have the two piece or the one piece harness without taking it apart? I will do either, although I don't want to, but I will, but I don't want to get the wrong one and be out a vehicle for work.

[@dannyjohnsonsgarage]

I had the same concern. I am under the assumption that they come as a 2 piece harness since mine was that way as well as others I have seen, and that the 1 piece is a replacement part. If you call a dealership they may have more information if you give them the last 8 of your VIN and ask

[@ltsallwood]

@@dannyjohnsonsgarage Thanks for the quick response. I have not had much luck with my dealership recently. I just found out that replacing the harness isn't covered by the warranty and only covers serious mechanical issues, and the dealership hasn't been responsive about it. I also took a gamble and had it delivered sight unseen. I will say though it's in great shape, minus the occasional hard shifting due to the bad sensor. For the moment, the only code it's throwing is for a bad transmission fluid temperature sensor. If it's just that first harness though, I can attempt to replace it myself and save me 900 bucks, which is what one transmission shop wanted to charge me. I can't for the life of me find a reliable harness though. I'm seeing them on Amazon but I'm a little suspicious of the sellers as they seem to be sold out of China. If I could find both the two piece and one piece, I would even consider ordering both just in case. Either way, I need this fixed, I just spent 23,000 dollars on this a month ago, so I don't want a 2 ton paperweight sitting in the driveway while I drive my crappy 1999 grand caravan lol.

[@dannyjohnsonsgarage]

@@ltsallwood I would try to buy the part number shown in the video at another Chevrolet or GMC dealership so you know it’s a GM part.

[@ltsallwood]

​@@dannyjohnsonsgaragewell I think I got all I need to make this repair. Got the two piece part, so hoping I don't have to drop the valve body. I noticed you didn't have to clean the connections of fluid before connecting the new part. Is the transmission fluid non-conductive? I saw a video where a guy sprayed break cleaner in the connections before clocking them together.

[@carlosmendoza8506]

Will this harness work on my 2016 Ltz 1500 6.2 8 speed as well?

[@dannyjohnsonsgarage]

Yes. That will also be the 8l90 transmission

[@Me-bm4ht]

help me! what happened if i dont change it soon,today i got that code 🙄 thank you

[@dannyjohnsonsgarage]

Of course the sooner the better. Mine had hard shifts from 1st to 2nd gear. Transmission cooler lines run from the radiator to the transmission so I don’t think it would run too hot but there may be a problem if it “thinks” it’s cold and try’s to operate the transmission under that info. I can’t tell you it’s safe but I can say I drove mine around town for a few months until the updated harness came in. That doesn’t mean it’s good or safe to do so, just saying what my situation was. I would for sure stay away from extended trips and towing until it’s repaired. Is yours the 8 speed?

[@droppinchicken]

How many miles was on this transmission when this was done?

[@dannyjohnsonsgarage]

It had about 50-60,000 miles. It hasn’t had a problem up to 99,000

[@droppinchicken]

@@dannyjohnsonsgarage mines has 130k should I do it?

[@elhalcondelbajio1923]

Hi, Is it necessary to put a new filter? or can it be reused?

[@dannyjohnsonsgarage]

I would strongly recommend it

[@stretchedout6408]

How do you know which harness you need

[@dannyjohnsonsgarage]

The dealer will tell you if you call in. Mine was for the 8l90 transmission so you’ll want to verify. Make sure to get the 2 piece one shown in the video

[@stretchedout6408]

I have the 8L90 I was just wondering how to tell if I need the 2 piece harness

[@timothymacdonald4793]

My 2017 Denali has this issue and so far all the auto shops I have talked to say the TCM needs to be flashed and that it isn't this simple. My spidey sense says they just want more of my hard earned dollars. My temp gauge has a twitch and when it quits working I get the P0711 Code. It will start working again and the code will clear itself out (or turning the ignition key three times fast really does work). Any thoughts?

[@dannyjohnsonsgarage]

Timothy MacDonald Is yours an 8 or 10 speed? The 2017 may have a 10 speed and be slightly different. I would imagine it’s otherwise the same solution- so see what the harness looks like If it’s just as simple I’d say swap it out if it’s not under warranty

[@timothymacdonald4793]

It's the 8L90 according to the VIN so unless someone has pulled a swap (which I doubt) it should be the same. It's a used truck so I've only had it a short time. Thanks for posting.

[@abiker21]

@@timothymacdonald4793 I fell for the TCM replacement and then I took it to a different dealer and replaced the harness under warranty and fixed your same problem.

[@dillonkaitypeters5132]

If I have the two piece what is needed to switch it to the one piece? I dnt wanna have to pull valve body if I dnt have to

[@dannyjohnsonsgarage]

You’ll want to get the other harness with the part number shown in the video

[@dillonkaitypeters5132]

Ok I have a 2017 Silverado 1500 and was told it's part number 24046895 for the new updated one does that sound right?

[@dillonkaitypeters5132]

I believe I said that backwards lol srry if I have the one piece and I buy the 2piece harness do I have to drop the valve body?

[@dannyjohnsonsgarage]

@@dillonkaitypeters5132 I understood what you meant. The video shows how I first got the one piece harness and returned it for the 2 piece harness so I did not have to drop the valve body. You only need the bottom piece. The part numbers are in the video

[@user-bj5hf9pj5q]

How many liters of gear oil?

[@dannyjohnsonsgarage]

It took about 7-8 quarts which is about 6.6-7.5 liters

[@user-bj5hf9pj5q]

Thank you. Danny

[@dannyjohnsonsgarage]

www.amazon.com/gp/product/B07Q3H159N/ref=as_li_qf_asin_il_tl?ie=UTF8&tag=2004047-20&creative=9325&linkCode=as2&creativeASIN=B07Q3H159N&linkId=da7318ad5dcfef0518b913261e8a03d5

[@__ll7__]

How do I know if I have the one or two piece ? I wanna order the part before taking the transmission apart

[@dannyjohnsonsgarage]

The part number is the main way to know when ordering. Both harnesses are shown with their part numbers in this video starting at 16 seconds into the video. The one piece harness has the big round connector

[@__ll7__]

@@dannyjohnsonsgarage right but like in my truck right now how do I know what I have ?

[@dannyjohnsonsgarage]

They should have all come with the 2 piece harness unless someone has already replaced it with a 1 piece harness. You won’t know until the pan is removed

[@__ll7__]

@@dannyjohnsonsgarage ahh gotcha, yea I’m pretty sure it’s never been changed so I should be good

[@rafaelhernandez2248]

Can u please send me the link to buy the harness please 🙏

[@4-matic212]

Hi did you find the new link ?

[@jamieyarbrough9290]

will the sensor part work on a 2017 yukon xl?

[@dannyjohnsonsgarage]

I believe yours will be the 10 speed, so the process might be the same, but it could be a different harness

[@jamieyarbrough9290]

@@dannyjohnsonsgarage I have an 8 speed.

[@dannyjohnsonsgarage]

Jamie Yarbrough Then it should be the same. Just get the correct harness like the video says so you only have to drop the pan and not the internals of the transmission (valve body)

[@user-gh5vo4fw2c]

Hey bud is there away I can get in touch with you by any chance?

[@dannyjohnsonsgarage]

Facebook messenger if you have it

[@bladegarciam3018]

Can I use dextron vl oil ?

[@dannyjohnsonsgarage]

It’s recommended to use the mobile 1 ATF HP LV www.amazon.com/Mobil-124715-Synthetic-Quart-Bottles/dp/B07Q3H159N?crid=A9G9KYUUW6QJ&keywords=Mobil+1+124715+Synthetic+LV+ATF+HP+Case+1+Quart+Bottles+Set+of+6&qid=1646415180&sbo=RZvfv//HxDF%2BO5021pAnSA%3D%3D&sprefix=mobil+1+124715+synthetic+lv+atf+hp+case+1+quart+bottles+set+of+6,aps,135&sr=8-2&linkCode=sl1&tag=2004047-20&linkId=f1fe31c99067b5e8a8583b8259956a16&language=en_US&ref_=as_li_ss_tl

[@bladegarciam3018]

Thanks

[@heathcalvert1319]

How about on a 99 durango

[@dannyjohnsonsgarage]

I would assume it’s similar, but not sure if the harness would be one or 2 pieces where you may need to drop the valve body.

[@michaelalvarez19]

Is there away to check the temp with out the tow haul

[@dannyjohnsonsgarage]

Only if you have a scan tool

[@sinister13cruz63]

Great video