thank you gary , for i almost gave up and spent 3k on a transmission. i cannot believe how much reasearch it took to find this video. my 2010 tahoe had reverse but no forward gears.
I'm so glad I found your videos on a 6l80.. I'm about to take one a part do to a stall converter that was put in about 2 years ago messing up and we found shavings in the converter after taking it out
My mechanic sent me a photo yesterday of my dismantled valve body showing one checkball having shrunk to about half the size. He was amazed. I'll be getting my car back Monday.its cost me more than it should have but a "specialist" told us we needed a new trans. I'll update after I've driven it
Excellent tutorial and description. I have a 2007 Escalade, just like you mentioned and it is showing the same conditions. I'm sure it must be the check ball. I'll be pulling it apart shortly.
Tim Johnson Tim, Thanks for the kind words, Another very common problem with the 6L80E, is the 1-2-3-4 piston likes to crack, of course its much easier to look at the checkball first, let me know how it turns out and if you have any questions be happy to help. Gary(my shop is in new york)
Check with your local trans shop, a 6L80E, chrysler transmissions such as 604 or 606 that ball would work, a local trans shop should have plenty of them.
+Gary Ferraro mine is a 2007 denali same as cadillac but it only does it when i stomp down to use passing gear then send tranny into limp mode i had codes p0796 and p2723 pop up which r both pressure solenoid codes but could check ball be causing this
+Outline Tech Security I would say that either the check ball is the problem or the bore plugs are leaking. Wen i rebuild these i install o-ringed bore plugs in the clutch regulating valves. The bore plugs fit very loose.
Hi Gary, almost positive this is the issue with my 2010 Sierra. Transmission was totally fine until I lost all of my forward gears. If I pull the tranny ignition fuse, it will pump full pressure and I can move forward to at least move the truck around so I know that it CAN go forward. Almost positive it's going to be this check ball issue. Once I drop the pan, how difficult will it be to drop the valve body from underneath the truck and are there any specific tips you can give before I do? I'm ready to do a lot of cursing this weekend. Thanks for a great video
After the pan and filter are dropped, you need to pull the sleeve out or the valvebody will not come down and i wouldn't want for you to break the TCM. There are 6 bolts the hold the valvebody to the case, a special socket is needed, the size is EP10 Like a torx plus socket. The tcm will need to be unbolted from the valvebody, then the valvebody can be unbolted and split apart
Taking a shot here. My 2011 Silverado 1500 started a code saying torque converter clutch circuit stuck off . Drove it like that and now there’s code for p0796 for pressure control solenoid c stuck off. So now I have 3 codes. P0796 p0700 and p0741
Hi @Gary Ferraro. Thanks for the videos and all your help. I have a 2010 Chevy Silverado 1500 with the 5.3l motor. I believe the 6L80 transmission. I have codes p0776 and p0700. The truck seems to over rev up to 4k rpm before shifting to 3rd gear and when in reverse it is really lazy and struggles to back up into my driveway. Also, I checked the trans fluid and it seems to be way overfilled! So I drained some of the fluid out until it was in the cross hatch area. I then drove it around the block to see if that made any difference but problem remained the same. What do you think could be the problem?
@@GaryFerraro It does NOT do it when cold. Forgot to mention that I just bought it from an auction and don't know the history in addition to the trans fluid being over full as well.
Did you find the problem mine was doing the same codes and same symtoms as you described I just took off the techcm and valve body trying to see what’s next
@@big_W I was told to replace the techm but I was not confident that was going to solve the issue and I didn't want to waste money if it wasn't the fix so I just replaced the whole transmission. Keep in mind, if you are able to get a guarantee from a reputable shop that replacing the techm will fix it then go ahead as it is a much cheaper fix.
I love watching your videos. I wonder why you did not clean and dry the surfaces of the split valve body before re-assembly. Every fibre of my being suggests that the surfaces should be clean and dry.
Yup new tecm and valve body and check balls truck runs good at higher speeds but seems shutter at first two gears and rpms seem to raise as I apply brakes coming to a stop
2007 Escalade. Every once in a while when going very slow under 7mph and go to hit the gas it goes into neutral for a second or 2 then goes back in to gear. Has a p0872 code. Do you think this is my problem? also after reinstalling the valve body do i have to take it to the dealer to have it put in learn mode?
Gary, great video and content as always. I am looking at my son's 2014 Silverado 6L80. NO CODES. The trans has drive and reverse and will lose BOTH at the same time. Cannot relate when it does this to any common denominator i.e. trans temp/run time. The scan tool displays the gear selected, but Gear Command on the scan tool was "neutral" on one test and the second test it was "1" regardless of actual gear selection. I am tempted to drop the valve body to look at the check balls but wanted your opinion.
Great video! Question do you have to replace the plate once you open the body up? Also do you go back tighten up all the bolts you put back in. It seemed you didn’t make the boots that tight.
Dear sir, could you please advise. I have stock 6L80 on my 2011 chevy camaro SS. I found UPDATED Valve Body Spacer Plate w/ 8 Check Balls 10-Up. Can I use it on my stock car?
Hey Gary, I’ve started having issues with my 4L80e in 2012 Chevy Silverado 4x4. Before it was going into limp mode and I could turn the truck off and then start it again and it would let me drive about 1/4 mile then go back into limp mode... Codes were 0700/0796(pressure control solenoid C stuck off) I dropped the pan and changed filter there was a lot of metal mush around pad the magnet... it drove a lot better then it started again 2 weeks later? I dropped the pan and changed the fluid again and there was still a good amount of metal mush around the magnet.What are your suggestions...
Hello Garry I got a 2016 Silverado 4x4 5.3. Got the 6L80 transmission. I have replaced the torque converter cause it had a shudder and a slipping out of gear feeling. After replacing the fluid and filter twice now, it has a delay in 1st gear. Takes of good in M2. Doesn’t go into 4th, 5th, or 6th gear. I have cleaned the valve body. It had a bunch of “aluminum debris” Help as I’m trying to avoid paying 2500-3000 dollars
Same I can go to about 50mph then it just goes to neutral until I slow down then goes to 2nd (Safe Mode) Or WOT I can go thru all gears 120mph+ until I let go of gas then just revs/neutral instead of downshift until I slow down but if I delete codes it's good for another 5min
Manufacturers designed these check balls to fail. I wonder if metal check balls would work better. Had a 2007 Escalade with the same problem. Paid 3 grand to fix it.
hello Gary, fantastic piece of work there, please Gary, how did you know the problem was the check ball, did it bring out any DTC? and also is this the only fault that put a car in neutral condition when in drive? thanks
Hello Gary, another quick question please , does this particular fault or code I mean the check ball fault , also happens to other transmission or it happens with just the 6l80s. Thank you sir
I have a Holden SS. Same as Pontiac G8 but in Australia. Mine keeps going into neutral spasmodically and I need to put it in M2 and off it goes again. Otherwise it works perfectly. My mechanic replaced the TEHCM and it's still doing it. Nobody in Oz seems to know about this issue with the checkballs
@@GaryFerraro thanks for the reply. Yes. It was functioning normally. I have a steep driveway. It first presented when I was going up the driveway and just as I stop to enter the garage slowly it appears to go into neutral with a slight braking effect. I put it in m2 and it will move forward . It may not do it again for 4 or 5 stops. Reverse is working perfectly. I saw your video and it makes sense to me but my mechanic was certain it was the tehcm.he drove it around and it wouldn't do it then I drove it home and it did it entering the garage again.
@@garylennard4278 Certainly sounds like that check ball is the problem, that would be the first and easiest to check. What year is the car? By the way Greetings from New York
@@GaryFerraro it's an my10 built December 09. Funny thing is I live in the city close to the factory where these were manufactured and exported to the US as the Pontiac G8. The Tehcm I bought was $1500 au from Holden so I bought one by part number from Rockauto for $700 au It would not communicate with my ECU.
@@GaryFerraro thanks for your help. I got hold of Sonnax .250 checkballs which my mechanic is gonna do. They're a pack of 10 so am wondering should we replace all 7 of they're the same size. Also is there anything else it would be wise to do while the valve body is apart!
Great info, I ordered a new TEHCM today, getting codes p150c and p2544 ( hard shifts and occasionally wont shift at all). Should I have ordered the entire valve body and tehcm? The part should be here in a couple days.
I have this exact same vehicle. 2007 Escalade. Every once in a while when going very slow under 7mph and go to hit the gas it goes into neutral for a second or 2 then goes back in to gear. Has a p0872 code. Do you think this is my problem? also after reinstalling the valve body do i have to take it to the dealer to have it put in learn mode?
That is a pressure switch code, it could be the issue, i would certainly address the code first. You rebuild the pressure switches and you do not have to take to the dealer for relearn, clear the codes and when the trans temp is 130F-140F drive the car and it will adapt, make sure no codes. Also, make sure it's full of fluid
I have the same problem I was driving down the road and it seem like a kicked in a neutral but it was in drive then I unplug the battery for about 20 minutes and hooked it back up and started driving again and it shift through all the gears and when I come up to a light and stop it act like it kicked back in neutral it does the same in reverse what do you think that might be and it's making some kind of rattling noise right there where the pain is
HI Gary I have a 2017 gmc 2500 with an 6L90 transmission. From what I've read this transmission is similar. My problem is....had two small incidents the day before where the first gear seemed to slip a little. Then yesterday I went to pull out of my driveway and I had no first gear. I have reverse no problem. What I ended up doing was i put the selector in L1 , then with the electronic shifter button I switched it to second and the truck drives no problem. When I start rolling I flip back to D and the truck goes through the upshot and down shifts just fine until I come back to the 1st gear spot.....then nothing. I have no check engine lights on. Does this sound like the checkball shrinking issue to you. Any help by way of advise would be greatly appreciated. Thanks Andrew
What type of scanner are you using to get this code? are you scanning the transmission? I'm asking because there may be more codes present in the trans
Hello sir, and thank you very much for this video. It seemed to solve my issue but now I have another issue after installing the valve body. My truck is very sluggish and it seems to be stuck in 3rd gear. It doesn’t shift up or down. Take off is very slow. Any information would be appreciated. Thank you again.
I have a 2008 Sierra 2500HD with 6L90e. I bought the truck needing an engine. Got it installed and the trans has no forward or reverse with codes p0700 and p0777. Fluid looks bright red. Suggestions?
Very informative, but you didn’t even touch a torque wrench. This may give some insight as to why when we send transmissions off to be repaired we virtually always have comebacks.
Yes, you are correct, i actually did torque this off camera, it's not like me not to use a torque wrench. Reason being i had to keep the videos 15 minutes or less according to youtube when i first started.
Hey Gary I have a question? I have a 6l80e in my silverado I'm having an issue with the torque converter lock up not releasing when I come to a stop occasionally . I have replaced the torque converter but it is still happening? What do you think?
Valves could be sticking or dragging in the bore, there are TCC valves in the Lower Valvebody and in the pump, did you happen to take the pan down to see if any debris is in the pan?
@@GaryFerraro hey Gary I have not pulled the pan off yet I will check that out. I think what might have been making it more worse was I had a stalled converter in my truck and to keep the converter from flaring in lockup my tuner maxed out the pressure to the tcc circuit. Since then I have replaced torque converter to a stock GM and had him adjust the tcc pressure back to stock and it seems to have cleared up my problem. One more question what do you think of the sonnax 6l80e zip kit do you think installing it would make a difference without installing the pump parts it comes with? Thanks for your time.
@@GaryFerraro check engine light came on then when I turned off my truck and turned it back on like 10min later the check engine light turned off, never came back on but I’ll check for past codes. No problems with going in reverse
p0842 Trans Fluid Pressure Switch 1 low voltage p0872 Trans Pressure switch 2 low voltage p0877 Trans pressure switch 3 low voltage p0989 Trans pressure switch 2 low voltage I have been told these codes mean the TCM is going bad and needs replacing.
Ben, the laminate disc's for the pressure switches are probably coming apart which is part of the TCM, you could either have it replaced or find a shop that can rebuild the pressure switches. Where are you located?
I dont know anybody out there, do you know if there are any good transmission shops in your area? Did the dealer give you a price on installing a new TCM?
Its the material that the checkballs are made of, when i overhaul one, i dont put those back, i use checkballs from another trans, ive seen then start causing issues around 60 to 80k, Gary
Thanks Gary. Tell me to do this repair you would not have to take the trans out of the car correct? Just drop the pan and remove the Valvebody correct?
Hey Gary , I had this same issue and took everything apart and found the check ball stuck in the separator plate. Thanks for the video. I have a issue now that I can’t start the truck. When I was done adding fluid and about to start the truck the gear selector was on M5, I left it in park before I pulled the valve body. I tried shifting into park and lost the line under the PRNDM part of the cluster. Do you have an idea of what could be broken or not done correctly?
you either missed the manual valve or did not hook up the manual lever position switch, that gets hooked to the manual valve and the manual valve goes into the linkage to select the gears
@@wickedczr The ims goes on the manual valve (They will move together) and the manual valve goes into the shift linkage. You can always send a picture if you like, my e-mail is gsferraro@yahoo.com
Gary Ferraro , thanks for the helping hand. Will drop it again tomorrow and take a pic if I can’t figure it out. I think I didn’t attach it where the gear part is.
Gary Ferraro , thanks for the help. Thanks to your videos and responses my truck is back on the road. I left the manual valve off of the shift lever but thanks to your recommendations it’s all squared away.
@@GaryFerraro I don't waiting on Yank to get back up with me after they cut it open. From visually inspecting it they said the outside hub shows signs of it getting hot from the red paint being discolored.
good morning Gary I have a 2007 Escalade ,and i got the techm replaces but i keep having a delay in shifting from park to drive.my scanner pulled up a code P2723.That says the pressure silenoid E. could you suggest what i might have to do
@@Ridingwithkenny ok, the problem probably is the #1 checkball in the valvebody has shrunk down and either is stuck in the plate or blew through the plate. I would check that first
Gary, I have the same year escalade and originally I had this problem. Went in a transmission shop and they told me all that was bad was TCM and replaced this 7 times and end up taking it to the dealership twice. replaced brake switch and the cam actuator. Now I have engine light on with p0700 code and D solenoid stuck code on and it stays in limp mode with engine light on. Yes the TCM was Re-Flashed and had all the current updates to PCM. What should I do now? You think the changing worn out check ball fix my issues?
Gary, I had taken my vehicle to another transmission shop and like you said #1 check ball was shrunken. Thank you for everything you really put me in the right direction on this repair. Transmission shops where scared to touch my escalade. You are the man!!!
Are there pressure control solenoids inside of the valve body for the 6L80? I am getting code for Pressure control solenoid B performance or stuck off. The truck drives but often goes into Limp mode.
It has the TCM inside the transmission, the solenoids are not serviceable. What is the code number? what does it do while driving slip and then goes to failsafe?
@@GaryFerraro the code is P0776. Hard and erratic shifting, I'm not sure if a gear gets stuck or if it just goes into fail safe mode. Seems like when it gets hot that's when it happens with high revving and doesnt switch gears.
Why wouldnt you just replace all check balls? All the teouble to remove it and if another goes bad you have to do it all over again. Unless that one was only 1 that shrinks
Hi I have a Pontiac G8 Gt 6l80e. I have codes P0700 P0796 it goes into limp mode I allready replaced TCM with a new one and same problem. Can you please help me on what I need to replace?
Nice video i have an 09 chevy avalanch with a code p0751 i had replaced the tecm took to dealership to program which i think they never did due to the code is still present they said there is no codes however my obd2 reader still reads the code i didnt replace the valve body or check the check balls was intimidated due to all components in valve body however yesterday my service 4x4 light went on again i had already serviced a month ago can and is there a part in transfer case that can cause a shifting problem?
This is a mechanical code, how does the car shift, when you had the techm out how were the pressure switches? Bad pressure switches can make a 751 code show up
DarkCry956 Yes, the torque spec is 71 inch pounds, there technically is a sequence, they have you start from the center and work your way out. Thanks Gary
Hi garry, I have a 6l80e in my gm holden commodore from Australia, would a valve body unit that is faulty cause the 6l80e to flare? Mine flares when I accelerate hard, I pulled the it out a few months ago and had a crack on the drum, that was fixed and transmission was good for a few months, now my transmission repare shop seems to think the problem is in the valve body?
@@GaryFerraro2-3rd... Will only do it once cars been turned off and in park, then re started and driving will flare once 2-3rd, and will not flare again unless you take off hard. I changed over the transmission with another rebuilt one and problem is still there and my mechanic believes it must be the valve body
Hi, great video! My 2008 GMC Yukon Denali has the 6L80 tranny. Lately, as winter started, when I first start the car, there is about a 2-3 second delay of engagement from Park to reverse, Park to drive, or reverse to drive...and when it does engage, it noticeably jolts into gear. If I let the truck warm up about 1-2 minutes first, it definitely is not so bad. If I drive the car up to temp, then turn it off, then restart it, there are no issues and engagement occurs right away. I had a recent transmission oil change, the tranny fluid level is perfect, and the truck only has 75k miles. No other transmission issues noted...Any thoughts?
@@GaryFerraro , thanks for the reply. It hasn't displayed any codes up to this point. I brought it in to a shop, and they said the tranny seemed great. That said, it was already warmed up when they inspected it/tested it.
@@GaryFerraro , the slip yoke does have a very mild weap of tranny fluid, but only occasionally will it weap a drop, and only if I leave it parked on at an incline for more than 12 hours or so without driving it.
@@KevinRapkochFishing Well, on this Tehcm, there is an on/off solenoid that controls engagement. possible lazy solenoid, when it's not as cold does it act up?
The code just went away after I replaced the valve body but now it seems like it goes in and out of gear shutter problem could it be due to the programming of the computers I kind of have a feeling that the dealership never program it but charged me SMH
hi I had a question I have a 2006 corvette with 6l80 and I'm getting a code P0777 "solenoid b stuck on" put the car in drive does not move, put it in manual mode 1 and 2 does not move put in 3rd takes off fine then throws itself in limp mode, I pulled the pan the fluid was dirty no shavings or anything but quite a bit of clutch dust on magnet, I put new fluid and filter in reset it again still does same code, what does that solenoid b stuck on mean and what can it be
This code is more of a hydraulic problem, not so much eletrical problem. The code shows probably because the car is not moving, if reverse is ok, first thing i would do is drop out the valvebody, disassemble it and see if the number one check ball is worn or blew through the plate.
+Gary Ferraro reverse seems to work fine, 1st just revs up pulls the engine down does not move 2nd is the same but 3rd takes off fine, I have never torn one down myself before, is there anywhere that rebuilds them? a new from gm is spendy $700
@@michaeljohnson91501 That checkball is seated against the 4-5-6 clutch passage in park,rev,neutral and drive 1st,2nd,3rd, sure it wasn't there maybe fell out
@@GaryFerraro hmm maybe it did fall out anyway I replaced it along with fluid pressure sensors and put it all back together now it makes a strange whirring noise in park and neutral then seems to quiet down in drive and reverse any suggestions?
The sound seems to rev match as well...shops try to tell me its the pump and want to rebuild the whole thing but I'm almost certain it's not because it didn't do it before I messed with it
Yes. It is the 6L80E tyranny and yes it did whine slightly intermittently... and after it got hot it stopped, but when cold like now it'll go right in gear...
What do you think about reman Dorman 6L80 TEHCM? I have 09 Tahoe setting codes for all 5 Pressure control solenoid control ckt high voltage. P0963 Line pressure control solenoid Ckt high voltageP0967 PCS 2 Control Ckt High voltageP0971 PCS3 Control Ckt HIgh VoltageP2721 PCS4 Control Ckt High VoltageP2730 PCS5 Control Ckt HIgh Voltageanother shop replaced the TEHCM with a Dorman Reman. The weird thing is it doesn't have reverse or neutral. If I shift to neutral or reverse it moves forwards like if it was in Drive. Powers and grounds to the TEHCM are Good. At this point I think I have a bad TEHCM What do you think? any help will be appreciated.
Honestly, i wouldnt use a doorman if they gave it to me, my supplier sells them and gets alot of them back. Even talking to a doorman rep at a semiar, he admitted to a problem when they were making them
@@victorortiz8232 Your welcome, if you happen to get a new one, it will need to be programmed. Whats wrong with the vehicle? Trans slipping? any codes?
I have a 2007 Chevy Silverado 2500 HD 4 wheel drive with the 4l90 and when I drive on the freeway and they go out to the street on the first stop dosing gate the first and the second gear
Yes. But later I put a brand new and reprogrammed and no fordward. Then I put another valve body and it works. What can cause no fordward in valve body?.
Hey Gary took my valvebody out of my truck notice the clutch springs was sticking in the lower valve body I replaced it with a new lower valvebody put it back together and install back into the truck now I’m getting a u0101 and u0100 code the truck will not start do I have to reprogram the techm?
If you had the valvebody out, did you plug the range switch back in, also, check the pins make sure nothing got bent. If you reused the original TCM then no, no programming needed
No it is not worn out. I just figured that the GM balls must be a softer plastic to wear like that so I found a ball out of 5R55 spare parts, plastic, measures the same, darker green color, thought I would put that in it..do you think that will be ok?
Thumbs down for not calling out sizes of sockets. Got all these guys that want to film DIY you tube specials and they can't even call out socket sizes. Waste of time watching this garbage.
@@Knotmaul Special socket to remove valvebody Torx plus size EP10, Bellhousing 14MM (i think, maybe 15) To pull pump apart 8MM, Split apart valvebody 10MM and 7MM
@@GaryFerraro yeah, I got the special socket. I just realized I added am extra teflon ball to my valve body.. instead of 7 balls for a 2011, I added an 8th. Thank you for your response, I'll delete my comment and upvote the video for your immediate response/help
