NISSAN P-1777 & 1778 - 2008 SENTRA STEP MOTOR CIRCUIT/FUNCTION

This video corrects the step motor circuit failure (P1777) AND the resulting P1778 - Step motor mechanical function which results IF you set the primary pulley pressure lever in the wrong position. Do it the right way and you can fix this in an afternoon. Do it the wrong way and...well, watch the video and see.
The step motors are readily available here:
www.amazon.com/s?k=nissan+ste...
www.ebay.com/sch/i.html?_from...

[@Masa61581]

OK i finally did the job and i did it by watching this video…and it was a great help…it feels so good to be driving again…THANK YOU

[@williammorse746]

Thank you for the help Frank . We need more of you. Working on a 2010 Altima Coupe 3.5l with a P1778.

[@richmondHeights1]

Thanks Frank you really helped me figure out wich bolts needed to be removed and lots of good information in this video.

[@bryanking7952]

You did a great job explaining the proper procedure for this job and I can tell you really put your heart into your buisness. I subscribed and I hope more people suscribe to your videos because you deserve it.

[@Masa61581]

thank you Frank for all the info you have been a great help…..im going through the same shyt

[@ekimviewmaster5010]

Thanks for this. I may be coming across this in the future. 👍

[@denmarkmanalansan-mp8hc]

nice and clear explanation boss..your the man…very helpful

[@reydajabon6086]

Thank you very much for this video.

[@hoquefaizul]

Very helpful video, thank you

[@josefranciscoesquertalaman3827]

Presente cordial saludo desde Navoyork Sonora México Like

[@MillGapFarms]

Excellent video!!

[@neil4855]

Good stuff!!

[@lawrenceboateng4904]

Thanks for the education

[@zx300ttt]

Thank you man

[@ivanpatino9714]

Hi Frank, thank you for the video, I replaced the step motor following all the steps (I did noticed that the dark rod on the fwd side near the 14mm bolt was all the way in on my and in your video it is halfway out). After assembling everything when I shift the car to Drive or reverse, it just stays as if it was in park. Any ideas of what I might have dine wrong. Thank you and please keep making great videos.

[@frankdaiii6403]

I would check to be sure you reassembled 1. the shift lever in the correct position. 2 all of your electrical connections are secured.

[@ernestomoreno2596]

Hi! Frank. I asked for help last week because I was working in my stepper motor and I couldn’t figured out how to put everything back, so you suggested me to send some pictures to your email but eventually I figured it out. However, I have another issue, I installed the stepper motor and put everything back, the car seems that is running fine but only forward , the rear gear is not responding so I can’t back up. I put the scanner abd it’s reading that code p1777 is pending. What should I do, did I do something wrong why the reverse not working? Thank you

[@vicentegonzales3852]

Dang VERY clearly!!!! U said again n again got it … I got customer want me fix it n what right part for 2013 Nissan maxima I believe… can u send me link so I can buy it … thanks for ur time and sharing videos!!

[@vicentegonzales3852]

Never mind about link .. I got it … but it same 2013 ?

[@frankdaiii6403]

@@vicentegonzales3852 CHECK WITH WHOMEVER IS SELLING YOU THE ACTUATOR. THEY SHOULD KNOW.

[@vicentegonzales3852]

One more mention… do we have to have scanner to reset or relearn? For transmission mission

[@frankdaiii6403]

@@vicentegonzales3852 YES, but any medium grade scanner can reset the Trans control Module.

[@vicentegonzales3852]

This week.. I plan to do that job n I got obd2 Bluetooth with my iPhone and said that vehicle must be 91 temperature for check fluids on drain plug … no dip then add more transmission fluid until see slow leak then put plug back that it …. Or can I use transmission dip stick ?

[@edwinalexander1170]

If the Nissan rogue can go up to 180 mph, but when you drive long journey it starts going into limp mode at 80 or 100mph and doesnt go more than that, and start hearing whinning noise from the transmission, and eventually going to limp mode at 20mph or 40mph and stalls, but when you switched off and park for about 30 minutes. When you switch on and driving it, the car will accelerate very well, going to higher speeds as if there were no any problem. The scan code is P0741, Torque converter clutch solenoid malfunction. How to solve this problem?

[@GerardoGonzalez-gp9hm]

Sorry to bother, how many quarts of cvt fluid does the car need after making this replacement? Ive been a lot of different answers!

[@tinagolson1341]

Di you have to put that expensive Nissan Trans oil ? Or u can use another brand or that redone for imports ???

[@frankdaiii6403]

You can use any CVT transmission fluid, as long as it says, "CVT".

[@ernestomoreno2596]

Frank I have another question. I am not a mechanic and by watching this video I tried to change the stepper motor myself, I took off the all panel where the selenoids and stepper motor at, but now I can’t put it back because another piece of the panel attached to the stepper motor came off, I probably took some screws that I wasn’t supposedly to remove. Do you have video how to put the panel back, beside this video? Thank you for feed back

[@frankdaiii6403]

I don't have another video, but if you can send me pics at [e-mail], i might be able to help you a little more.

[@ernestomoreno2596]

Thank you Frank. I’ll send you pictures. I appreciate you man.

[@ernestomoreno2596]

Thank you Frank. I’ll send you pictures. I appreciate you man.

[@ernestomoreno2596]

Thank you Frank. I’ll send you pictures. I appreciate you man.

[@ernestomoreno2596]

Thank you Frank. I’ll send you pictures. I appreciate you man.

[@chriscantu6019]

So I did everything except the pin bit but the car accelerates on it own on the freeway could that be it

[@michaelrojo7712]

GOOD LOOKING OUT THANKS.

[@ehiztechgadgets9ja]

Please help, my Nissan altima 2008 2.5s stocked up in first gear, won't go beyond that, after diagnosed with computer, P1777 code was detected, today I took it to my mechanic, he service the gear, and test drive, it worked, after few seconds, when the car warmed up, it got stocked in first gear again. Now I noticed That ATF fluid was used to top up the gear oil instead of CVT fluid.. Please I need your help, what should I do?

[@frankdaiii6403]

OK. First of all, a P1777 is an ELECTRIC code that tells us the step motor is not reacting properly to electric input. I'm not sure what he did when you say he "serviced the gear." Absent obvious wiring damage, the repair involves replacing the step "motor" (actuator). Second, if your mechanic filled your tranny with ATF and not CVT fluid, I recommend you get another mechanic. it needs to be drained and refilled with CVT fluid. The step motor is relatively easy to replace. I think I bought mine for $34 or so. I hope this gives you some direction.

[@chrisvill54]

I have a nissan rogue cvt 2012, when you have a bad stepp motor or not properly engaged does it feel like a clutch slipping ( rpms go all the way up on acceleration but vehicle barely moves) or is it more like you accelerate but rpms don't really move all the way up?

[@frankdaiii6403]

MINE felt like a dead pedal (limp mode).

[@chrisvill54]

@FRANK DAIII yeah from the videos I have seen. It looks like the symptom is like limp mode. You floor the accelerator pedal but it won't accelerate. ( rpms just get stuck on 2 or 3k rpms) mine is more like slippage, rpms shoot all the way up but vehicle barely moves. Definitely a mechanical issue with the transmission.

[@amxr2728]

Would this fix my clutch slipping problem? I have a P1778 code but my 2011 sentra doesn't go limp, it does the opposite (rpms up but barely moving)

[@frankdaiii6403]

I don't think it's a clutch problem. 1778 is a mechanical malfunction of the step motor. Circuit is good, but it's not responding as it should, which means it could be stuck in high gear.

[@amxr2728]

@@frankdaiii6403 do you think I should proceed to replace the stepper motor?

[@frankdaiii6403]

@amxr2728 yes.

[@tonymchopa2823]

My Nissan dualis didn't change to another gear and I got code p1777 and p0845 and p0740

[@Mary-qo1wu]

I am having the same problem I push gas pedal and nothing. But I reset the throttle body relearn procedure it will go for about 50 feet and go into limp mode ! MY question is if the transmission was messed up mechanical part of it. Could by resetting comp fix it! I think it's an electrical part solenoids or stepper motor! Any ideas

[@frankdaiii6403]

Well, if your scanner produces a P1777 you're gonna need to replace the stepper motor. Resetting the modules will let it run normal until the TCM picks up a failed diagnostic.

[@Mary-qo1wu]

@frankdaiii6403 I did have a code I don't remember what it was. B4 he reset the code on his little scanner thing. I think it said speed sensor! But I called nissan and he told me at the parts counter that it sends the sensor code when there is an internal failure! But I figure a computer can't fix a broken mechanical thing right! It drives for a little bit then stops! In limp mode! No sounds other than maybe a lite scrape of metal. If I change the stepper motor and maybe solenoids do u think it might work!

[@Mary-qo1wu]

And there is reg atf oil in the tranny. Is that OK

[@frankdaiii6403]

@Mary-qo1wu NO NO NO! CVT Transmission fluid is all you should use. Period. You are correct, you are not going to fix anything with a scanner, BUT you need the actual diagnostic trouble codes in order to be pointed in the right direction. AND you should know not all base-level scanners will pick up Nissan transmission codes. Do not "fire the parts cannon" at the problem and hope you fix it. Generally, metallic sounds coming from a Continously Variable Transmission ( or any tyranny for that matter) is a very bad thing and you should have it checked by a reputable shop.

[@edwinalexander1170]

Does the steeper motor when goes bad cause the whinning noise from the CVt transmission ?

[@frankdaiii6403]

I don't think so. Make sure you have the proper fluid level , but more importantly make sure it's CVT FLUID.

[@alfredogomez2494]

Where can I find you?

[@MartinRamirez-jl7sy]

I had that same problem on my car,i just check car and show number p1778 step motor function.

[@guadalupeherrera9980]

Please help! Had two codes P0776 and P1778. Replace solenoid A and stepper motor. P0776 is cleared, and P1778 was replaced by P1777, may be I did something wrong! Please give me some light:) I’m new at DIY :)

[@vicentegonzales3852]

Before do anything… when drain did u see shaved metal or glitter?

[@steve-ip1cd]

Did you have to have the transmission reprogrammed?

[@frankdaiii6403]

If you just replace the stepper motor, no.

[@edwinalexander1170]

Why the car doesnt go past 60mph although you keep pressing the gas pedal to achieve higher speed ?

[@frankdaiii6403]

I have no idea based on what you've written. it could be many, many things. If you're at a point where you can't figure it out, i recommend you take it to a reputable mechanic.

[@ernestomoreno2596]

What happened if the vehicle was running without transmission fluid? And through code p1777 and p 0845??

[@frankdaiii6403]

Get it looked at by a professional, but it sounds like you burnt up the actuator (valve) body. 1777 is the step motor. I believe a while ago I saw a p0845 (IF that's a pressure sensor B code) in a friend's Sentra and one possible fix was a valve body replacement. It didn't work. That being said, we also found the harness mangled by a previous "mechanic" so we never really got to the bottom of it. IF you ran it with very little fluid for ANY length of time and the vehicle produced DTCs, my recommendation is you get it to a transmission shop that works on CVTs and pray for the best. The p0845 is the doozie. As I think back, the pressure sensor is in the middle of the valve body and is not serviceable if I remember correctly. I'm not a mechanic nor a transmission specialist so I'm just telling you what I would do with my own vehicle. GOOD LUCK!

[@ernestomoreno2596]

Thank you for your feedback. I run a scanner and in fact is reading code p1777 and p 0845

[@ernestomoreno2596]

Thank you for your feedback. I run a scanner and in fact is reading code p1777 and p 0845

[@ernestomoreno2596]

Thank you for your feedback. I run a scanner and in fact is reading code p1777 and p 0845

[@ernestomoreno2596]

Thank you for your feedback. I run a scanner and in fact is reading code p1777 and p 0845