Really want to attack this DIY, getting much egde to attack this with this video and your comment.

Happened to me today smh 🤦🏾 😪 lucky this guy made this diy in depth great content!!

Did you ever figure it out? Struggling with this right now

@@project4funner anything?

@@project4funner you pull the arm all the way back and you will notice a small hole that goes straight through the valve body. Place a hair pin or something small in there to keep the arm from moving back. Install the valve body and remove the pin.

@@dwaynedumas5278 thanks for the explanation. I had been having a real hard time trying to get it in place with flat shim stock from above while installing. Should have known there was a better way

@@dwaynedumas5278 i have seen another video, who placed a pin wire but after completing from assembling, he havnt removed the pin, i dont know he forgot or it must not be removed

Edward,I am sorry, but I am not familiar with the SR20 transmission. Could this be the SR20 Nissan engine? If this is the case, do you know which CVT it is mated to? Thanks,Matt Jonson

Exactly what I'd like to know... Apparently nobody talks about a fix for it.

Im in the same situation p1778

@@fervienteteocrata1915 I had to replace the transmission. Car runs like new now!

Transmission getting stuck in limp mode, stuck in a low gear. Also I believe it may bounce back and forth between gears like it does not know what gear it wants to be in. If your fluid is at proper level it could be valve body issue. If you are getting engine light with error code P0845 or P0840. Nissan has put out a service bulletin recommending replacing the valve body. I believe there are a couple other codes mentioned as well. Im no expert, just from what I have learned dealing with my CVT issue.

@@JohnNorris411 Please help, haviung the same problem with exact codes

GIVE DEALER YOUR VIN NUMBER

Just search JFO11E or REOF10A

😂😂😂 You know it does

Order it online

josh bishop - LOL! The similarity of his voice had me wondering if this was AVE's real channel and his whole hilarious canadian mech-tech-nerd goofball persona was just an act for youtube glory!

And to Mr. Kennedy, if you don't know who AVE is, just search his channel on youtube... He sounds JUST like you in tonality and similar in speaking tempo, but with a Canadian flair. :-)

orcoastgreenman lol, "Canadian flair". But yeah, definitely search AVE if you've never seen one of his videos.

What was the cause of your P1778? I just got that code, but car runs good up untill its supposed to shift from 3rd to 4th...

How did you make out? I had P0746. I changed fluid and fliters and it went away. Now i have P1778 code... Cant win with this damn CVT. Never will i own a vehicle with one every again!

Fredy,Start with any Diagnostic Trouble Codes. Stepper motor circuit codes are a higher likelihood of a failed stepper motor than performance codes. Stepper motor performance (or rationality) codes are very rarely caused by a failed stepper motor. If you have a good scan tool, you can watch the stepper motor position and make sure it is changing properly. On most Jatco units the stepper motor position ranges from 0 to 188 (on the live data you generally see only an indicated position of 5 or 7 to ~188). If the stepper motor is actuating properly, you should be able to correlate the position change with the ratio change. If the position changes as expected, but the ratio does not, it is likely something else causing the issue and not the stepper motor.Thanks,Matt Johnson

Kennedy Transmission, CVT & Auto what aboit checking the resistance of the step motor I followed alldata said that all for pins of the cvt unit need 15 ohm , in 3 pins i got 15 but 1 is 10 ohm , that mean that the step motor is bad , i got the code p1777 , can wont move just idle

When it is bad your vehicle will lock in a ratio, for example, if it was in a 1:1 ratio when it fails, it will remain in that 1:1 ratio, its like keeping your car in 4th gear and driving, it won't cut off because of the torque converter.

When I restart the car, it accelerates normally then after a few minutes, it goes back to the delayed acceleration. No codes other than P0868.

Giovanny,If the secondary pressure low code is the only one being tripped, it is less likely to be a ratio control motor or pressure control solenoid issue. Have you made sure the fluid level is full? There will be often be pressure issues and a pump whine if the fluid is a couple of quarts low. You may want to clear the code and see how it drives once you verify the fluid level is correct.Thanks,Matt Johnson

@@kennedytransmissioncvtauto5430 we replaced the whole cvt assembly, VB, TCM, Accelerator position sensor, throttle body, yet it still popped up the same code. Even when we erase it from TCM it's still comes back. We did EEPROM Erase too, still showing. Theirs no engine light either. No codes for bad solenoids, stepper motor, etc. just the p0868

@@kennedytransmissioncvtauto5430 fluid pressure is good. And full yes.

A drill bit works fine.Thanks,Matt

@@kennedytransmissioncvtauto5430 I left a comment up there would be really cool if you could assist me I have a valve body out on a 2010 Altima laying on the table throwing p1778 code and low fluid pressure code but the car seems to be driving fairly normally so I've replaced the stepper motor but while I have this valve body out...you were saying something that that's not usually the problem?.. is there anything else I need to do before I put this valve body back in I'm not a transmission guy just a regular mechanic of 26 years... I checked that first solenoid forgot what you called it it reads 27 and some change ohms

Yes. Same one is used from 07 to 17.

Anton,On the Jatco 2 speed CVT's, it is very common for the high low shift quality to take a while to adapt in well after any sort of change. I have spent hours in a couple of cases performing the relearn and then doing a ton of slow accel/ decal driving to get the shift quality to come around. That being said, I have not had any noise issues after making any valve body changes or repairs. I do not think it would be anything in the valve body at all making the noise, but the valve body controls the application of the high/ low clutch and could possibly be doing something hydraulically to cause the clutch noise. If it does not lessen soon, I would bring it back to the shop that replaced the valve body and let them hear it. I am assuming this is a new valve body installed and adapted by a dealership or someone familiar with these transmissions.Thanks,Matt Johnson

Kennedy Transmission, CVT & Auto I meant to say that I had the noise before they replaced the valve body, I am picking up the car tomorrow so hopefully it is gone. I asked them what happened but the service gal couldnt exactly state, just said the was a TSB out for this problem or something

Anton, There are a number of technical service bulletins regarding valve body replacement on these units, but none that I have seen pertaining to noise caused by a valve body issue. I would expect that the noise has been alleviated if they are having you pick the vehicle up. Assuming so, I suspect there may be a wear issue with the valve directing pressure to the high/ low clutch. Thanks, Matt Johnson

Kennedy Transmission, CVT & Auto like

Could be a bad high speed sensor you will damage the trans if driven with this not working or they need to do a better job reprogramming.

hi, did you ever figure this out? thanks

@@josedasilva4433 The pressure regulator in the pump was slightly damaged causing a fluid pressure loss which cause damage to one of the variators.... chewed up the slide bearings... I totally disassembled the transmission ordered a kit...kit was under $500 shipping and all...came with upgrade parts and an upgrade pump with a bigger pressure regulator valve in it...

@@motersickel Would you be able to send me a link to the kit you purchased? I would like to see what came with your kit. I believe this is the issue I am having with my 2011 Nissan Altima. No slipping, but it will not shift and I have a low pressure code which makes me believe it is the transmission oil pump. Belt and pulley's look like brand new, but I have not removed the transmission. I have only been able to see certain parts after the valve assembly was removed.

Sorry sir. Jatco makes horrible transmissions. Dont buy a nissan with an automatic/CVT.

Kurt, On the Jatco CVT's, we almost always find that something else caused the belt failure. Extremely rare to see a broken belt with the rest of the unit still in good condition.

Kennedy Transmission, CVT & Auto I may be calling the parts by the wrong name but I found a failed variation pulley I replaced both pulleys and belt and as of yesterday the car is back on the road

@@kyleburt442 Hey Kyle Glad to hear your up and running again! Was it hard to rebuild the unit yourself? Watched a couple vids and doesnt seem too crazy...but i have no clue where to source parts for these...

P1778 could certainly be caused by a mechanically faulty stepper motor. The P1778 is a performance code rather than an electrical code, meaning the controller is commanding a certain value, but not seeing the expected result (in either ratio or primary pressure) and not detecting an electrical failure with the stepper motor. If the code were a P1777 (electrical fault on the stepper motor ckt) , the likelihood of a stepper motor failure would be higher. That being said, it would be good to get the pan down, inspect metal content and the ration control valve when you test or replace the stepper motor. With just this code, if the issue is not the stepper motor it is likely internal; something impeding proper variator operation. I hope this helps.Thanks,Matt Johnson

If we do have those codes for the circuits of the solenoids and no step motor and no check engine light, by replacing just those solenoids could fix it and get the vehicle out of limp mode? I’m currently have issues where my 07 Nissan Maxima car will jump to fifth gear at 20 mph. Am i better of replacing the cvt or could there be another route

How much metal is ok?

How did you make out? I got the same code, but car is driveable! Im getting scared after reading all the horror stories...

Go look up the Nissan service bulletin for that error code.

@@JohnNorris411 changed the sensor, filter, and fluid, code went away

@@mdamron115 I have the same code. I have pulled out the old valve assembly, and put a referbished one in. Just waiting on a cooler filter in the mail to complete the job. I am adding an external cooler to keep the fluid cool. Will report back when its all done.

@@mdamron115 By the way, You may have another filter under the cooler which should be installed just under your Battery mount. You might also want to install an external cooler to keep the issue from coming back.

@@JohnNorris411 How did it go? You got it fix by the refurblish one?

Did you get it done?

Yep having the same problem on an Altima apparently he's not getting back to any questions anyone...as I'm not a transmission guy but have been a mechanic for over 26 years and I just am not buying a whole entire transmission when the vehicle is still driving pretty normally just throwing the stepper motor code...maybe it's a secret he don't want to tell anyone...

@@motersickel Haha I just got this code too! But car is still getting around. If anyone can chime in for this code, cause its like a secret on the net! Search for 2 days and not a fix or definite cause for it...

@@splash5974 well since this comment I have took it on myself to rebuild the transmission in the Altima and have found out it is actually pretty simple... so if you're getting that code you might want to be ready to rebuild it sometime in the future... what happens is the input variator behind the torque converter moves in and out with changes the gear ratio, well there's no actual gears it is a belt... the variator stops moving smoothly due to lack of lubrication going to the slide balls... it starts to jam up which causes a code to throw for the stepper motor that reads this movement the start of this comes from the pressure control valve in the pump gets hairline scratches in it causing a fluid pressure loss... eventually you may get a low transmission fluid pressure code people think you don't have to change the fluid and filter on these for a very long time when in fact I would do it every 30000 miles.... these Transmissions are a very good transmission they just had a few failing points whatever it takes transmission offers a overhaul kit that is also an upgrade kit ..I ordered this kit from them and a upgraded pump.... I highly recommend this kit from them....

@@motersickel Ok i was worried about it being more than just a valve body issue... Im justcabout to order a nee valbe body and swap it, but makes sense what you're saying. So the variator is damaged and not changing ratios. Thats why i can go above 45mph, cause it wont change to higher gear ratio. I seen a couple vids on rebuilding it. It doesnt look like a nightmare job! Everthing i look up for rebuild kits are just gasket kits. Where did you find a complete kit to do the rebuild? And did you do it from vids or get a manual to rebuild it?

@@motersickel I didnt get ghe actual name of the place you found the parts. You replaced everthing with new? Belt, pulleys, valve body, clutches, pump?

Did you figure out the cause?

Reed,I am sorry, I am not sure how to access the temp PID on the torquepro app. I know most Chrysler's are simply is ID'd as "TFT", or Transmission Fluid Temp" on most of our scan tools. You may have to access the PID under Engine data though since your Jeep has a PCM rather than separate TCM and ECM; I know this is true for most of our scan tools.Thanks,Matt \

Kennedy Transmission, CVT & Auto Thank you Matt. The pid's available in the app as well as the supplemental downloads do not register proper readings for the CVT. I was hoping to get the right pid and then just enter the values manually in the area. Take care brother and thank you for your help and time. Love the videos, they are a invaluable tool for many.

Reed,I am sorry I am not familiar with the torquepro platform. I know we can access the TFT PID with Snap-On, Autel, OTC and OEM etc... tools we use. You may be able to get a fairly accurate reading by using an inexpensive infrared thermal gun on the pan.

THE ROM? YES

Yes, they call it the ROM read only memory small black square made to the harness.

Everything I see shows the transmission as a Nissan RE0F10A (Jatco JF011E). Often times stepper motor DTC's are set by issues other than the stepper motor. However, with just a P1777 (circuit fault), there is a reasonable likelihood that this is just a stepper motor failure. Before going any further though, you should check your harness connection and pin tensions, clear the code and see if it returns. If it does, you may want to just install the stepper motor from the original transmission and test from there; unless you suspect it was the cause of failure. We have not had good luck with used CVT's and quit doing them all together a few years ago. Hopefully, the stepper motor (if needed) from the old unit will take care of the issue.Thanks,Matt Johnson

Thank you for your response. The weird thing is the code does not erase. You turn the key to on position, engine off. Erase. And when you read again, it is still there. Could not make it go away. The bad thing is this is the third transmission I put on this car. And I sent the original back, long time ago as core.

Assuming your scan tool is getting the code to clear, it is likely a short or open in the stepper motor circuit that is instantly re-setting the code on key up. When the code returns instantly on key up, it points towards a stepper motor failure.Thanks,Matt Johnson

Yeah, that is the case. I erase the code. Turn the key off, turn it on without starting the engine and the code is still there. So I guess I need to change the stepper motor. Thank you for your response.

Hello auto master , so did the step motor fix your issue , having same problem thankyou!

With the P0840, the unit is likely defaulting (locking itself into a single ratio to avoid potentially damaging itself). I am not sure what tools you have, but I would suggest verifying the fluid level is full, documenting any other codes that may be present, clearing all the codes and driving the vehicle gently with a scan tool hooked up. You would want to monitor the pressure sensor PIDS and make sure that they are reading correctly. If the P0840 returns immediately after clearing (or simply before driving), I think a replacement of the pressure sensor would be warranted even without further testing with a DVOM. Make sure to look at the pan magnets; if the metal content is excessive, it may already be to late.Thanks,Matt Johnson

Thanks a lot for the help! I have an OBDII scanner to just check and clear codes. The P0840 is the only code that I'm throwing related to the transmission. I have a P0420 for an O2 sensor as well. I have also thrown I think a P0725 in the past, but once or twice. Some days it'll throw the code immediately when I start the car, some days it takes a couple minutes, and other days it will drive perfectly fine. I don't have any tools to monitor the pressure readout of the sensors, but I'll definitely take a look at the magnets when I pull the pan. Thanks again for the help, hopefully it's not too late!

@@InfusedGamers hey man did you ever find what was the problem I’m running the same issue with the same car and model any help I do appreciate

Xiaomin, Correct, you can swap the vehicle's OEM RAM card to the valve body you are installing. Thanks,Matt

@@kennedytransmissioncvtauto5430 what if you don't swap the RAM? Would a reprogram of the TCM be sufficient?

Giovanny,Yes, you can re-flash the replacement module if you have access to a Consult, or simply have the Nissan dealership flash it.Thanks,Matt Johnson

Dan, We are in Minneapolis, MN. When you replaced the filter, was there a lot of metal on the magnet or in the filter screen, or a lot of clutch material in the pan? Have you had the Jeep scanned for codes? The issue may be related to the valve body, stepper motor or pressure control solenoid, but the whining makes me concerned the issue may be internal. Did you use OEM CVT fluid?Thanks,Matt Johnson

Kennedy Transmission, CVT & Auto Yes the magnets were furry the oil in the pan seemed inundated with fine metal. It ran well after the oil change, I used valvoline cvt. Thank you for the reply.

Dan,Given the noise and the metal content, it really sounds like a bearing is failing. When the bearing starts shedding metal, that often causes scoring on the pump flow control valve which in turn causes a lack of proper ratio change. Unfortunately, I think the unit will likely have to come out and be rebuilt.Thanks,Matt Johnson

Kennedy Transmission, CVT & Auto Ok, thank you for your time. How much do you charge, plus shipping to Joplin Mo.

Dan,I am sorry, I do not stock any pre-built units. If rebuilding is necessary, we overhaul the vehicle's transmission. This allows us to save the vehicle's ROM and avoid needing to re-flash.