Causes and Fixes Nissan P1778 Code: Step Motor Function

How to fix a Nissan P1778 Code: Step Motor Function
A P1778 code is an issue with the Continuously Variable Transmission (CVT) transmission. A 1778 code is set when there is a problem with the stepping motor function or its circuit. Symptoms of a P1778 code is usually slow acceleration or transmission shifting problem.
Some scan tools will also give the following definitions.
P1778 Transmission Reverse I/P Circuit Malfunction
P1778 Code: Step Motor Circuit Intermittent
Possible Causes of a Nissan P1778 Code
Stepper Motor
Stepper Motor Wiring
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[@apocalypsemaow4563]

Thx brother, short and to the point.

[@victorialopez8505]

After replacing a step motor do you know if you have to recalibrate the vehicle?

[@jay-nv8jz]

Hi i’m having this same code pop up in my 2011 Nissan Murano brought it to nissan and they’re saying the transmission is no longer usable skmething about the solenoids. The car at first took a while to accelerate and would usually start to pick up when i would go down hill after maybe 20 more minutes i couldn’t even make it up a hill without it rolling back down.

[@jesseserrato1978]

2012 nissan rogue sv. Does stepper motor need to be recalibrated?

[@robertcarlton8712]

Thanks for the video. I have a weird lope/ momentary loss of power. 4k drops to 2k and comes right back up. I suspect a sticking stepper motor. I’ve thought about getting a remanned valve body. I do not have a code though. It could be a bunch of different things. It’s driving me crazy. I can’t remember a time when my Altima didn’t do that. Seems random but tends to happen more often when turning left. Also when it’s cold. Engine can be warmed up but the first drives of the day are when it happens most. On the way to work and coming home from work. Idk how to sum it in one question but, in your opinion do you think that could be possible? Sticking stepper motor? Also suspect a clogged fuel injector. I’d appreciate any thoughts you may have on this. Thanks.

[@jay-nv8jz]

is it drivable even with that? just wondering because mines doing the same and isn’t drivable

[@takudzwam1670]

Hey how you doing hoping to get a reply I’ve got the same code and I’m considering changing it But I want some quick help please mine moves but picks up so slow ones it does the revs seem to be Soo high… and it’s vibrating up hilll checked the fluid level and it looks like it’s above the full line do you think I should change the tranny of that small thing

[@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?

[@HVAC_Mechanic]

A Nissan P1777 Code is a "Step Motor Circuit Fault." This code may be hard to troubleshoot. It could be a bad transmission, the wiring, or the TCM (Transmission Control Module). Tests will need to be done to find the issue. Be sure to check the fuses, especially any fuse labeled TCM.

[@migalancitosanchez7688]

​@@HVAC_Mechanic Friend, I have a question and I wanted to know if you could help me and I don't know if this is the beginning of my transmission starting to be damaged in my 2009 Nissan Maxima, everything works fine and I have no problems accelerating or anything like that and when I brake everything is normal, but The problem is that before stopping completely the car seems to skid or give a push, and I don't know if it's a transmission problem or something else.

[@jaymia6925]

Got this code on my maxima. Hopefully this is the fix I need 💯🔥

[@takudzwam1670]

Same here bro

[@AndrewGarnerAdventures]

Did it help?

[@DieMined]

What if I replaced it an the code still shows up? Think it’s a faulty part?

[@HVAC_Mechanic]

I would check the wiring.

[@scottmayo28]

I think it's internal stepper was installed correctly

[@markcortes6650]

Hey man watched your video thank you for the input i have the code p1778 i took it to a mechenic they said transmission needs to be replaced and i took it to nissan dealer and they said the same thing transmission needs to swapped out. The transmission only got 92000

[@steve-ip1cd]

Did you have to have the control module reprogrammed?

[@jay-nv8jz]

they said the same thing to me

[@jay-nv8jz]

did it end up needing a transmission or was it the stepper motor?

[@poochtooth]

Stuck in 1st Code p1778 Replaced step motor then test drive it warmed up then went back into limp mode and thru pending code for p1778 again and intermittent oil pressure light on /off

[@poochtooth]

Any advice?

[@poochtooth]

Fluid level good

[@poochtooth]

2008 Nissan Altima 2.5

[@HVAC_Mechanic]

If the part is good and there are no other codes, it is likely in the wiring

[@poochtooth]

Wiring on valve body or…

[@sertlilg1071]

what a nightmare this is why my nissan is manual transmission 😂

[@02168226]

I replaced my step motor and about 2 hrs later the light came back on with the p1778 code

[@Yaboykcc]

Same here man could it be the valve body need replacing ? car still goes everywhere it doesn’t get and worse so my transmission cant be bad right ? usually a bad transmission goes out fast so im thinking maybe change the valve body?? its a 2014 Nissan maxima. Please help i just paid about $5000 for this car 4 months ago 🤦🏾‍♂️🤦🏾‍♂️

[@brionnawilliams512]

I just took it today to get the transmission replaced

[@aaronthurl]

@@YaboykccSame here 2014 nissan maxima🤦🏾‍♂️ did you figure it out?

[@SierraForeTweny]

@@aaronthurlit’s sm bout them 2014 maximas fr 💀 same here 🙋‍♂️

[@aaronthurl]

@@SierraForeTweny smh and i’m still driving as we speak while the transmission still going bad 😂🤦🏾‍♂️

[@gustavorivera9281]

I have a 2009 nissan morano and I change the stepper motor as well as the whole valve body and it still giving me the p1778,p0746 I'm have no idea what else I can check can you me help me please

[@HVAC_Mechanic]

A P0746 code is Pressure Control Solenoid “A” Performance / Stuck Off. Were both codes there before replacing the stepper motor? I would check the wiring and test both solenoids.

[@shiftyxdre6585]

I have a Nissan murano 2009 and it showed me the same 2 codes. Have you figured out the problem ?

[@j2dap700]

Hey have you figured out the problem? ​@HVAC_Mechanic

[@j2dap700]

@shiftyxdre6585 Good day! I plan to replace my stepper motor today. Hopefully, I will be able to do it successfully. I have the same two codes.

[@makaylawalker5919]

2013 Nissan maxima same code coming up🤦🏽‍♂️

[@aaronthurl]

did you get it fixed?

[@scottmayo28]

Replaced stepper motor still doesn't shift past 2nd