Iluv:
Hello,

Can someone assist with a reputable transmission mechanic to help fix the following codes on a Nissan Altima 2008

P0710
P0720
P1777
P0175

The car refuses to engage any gear. it moved a bit after the nozzles were serviced and now it cannot change from gear 3 to 4.

Thanks.

Iluv:
Hello,

Can someone assist with a reputable transmission mechanic to help fix the following codes on a Nissan Altima 2008

P0710
P0720
P1777
P0175

The car refuses to engage any gear. it moved a bit after the nozzles were serviced and now it cannot change from gear 3 to 4.

Thanks.

Costee:

Since you have P0175, I want to presume your car is 3.5L engine. In that case the model of your cvt is RE0F09B. The first three codes are related to the transmission, and if yours is 3.5L then I'll suggest you tackle P1777 (Step Motor) first. Nissan does not sell it as component unit, rather they'll suggest you change the valve body of which it's a part. The step motor is also used in the the Maxima and Murano of the same years. It's possible too that the step motor for earlier Murano trannys (RE0F9A) may be compatible. I'm saying this because you might be lucky to source locally as Tokunbo. You could also contact Kashif on these boards, seems he can easily source these SMs.
If your Altima is 2.5L, then the primary focus will be P0710, the CVT Fluid Temperature Sensor.

GAZZUZZ:


Let me give others a chance.

Cc: Ochucko

Please help the op with a preliminary diagnosis and possible fault.

nissparts:
The answer usually lies in knowing proper history.
OP should provide details of how the symptoms began.
What work was done before it started and what has been done after.

As usual, I will give an educated guess still, trans fluid has been compromised.
Either wrong fluid or water in the fluid.

Costee:
Yes, all very well. Seems the OP is so engrossed with issue to pay any attention here (for the moment). Anyway, since I'm presuming the car in question has a VQ35 engine, I'll still settle for the step motor. The part is so sensitive that it could be damaged by an electrical glitch, improper battery connection for instance. The damage might not even be immediately noticeable if minor impairment had resulted, thus making it difficult to associate the damage to the glitch. At all events, it sure would be less expensive if it was a step motor issue. If the temp sensor was damaged, then another valve body is required, which in our local context means transmission replacement.

Inception:


In Wole Soyinka's voice: In this Economy?

Costee:

I'm on the OP's side. I do wish for his sake it is a step motor issue. lol.

Kashif:
There is something you guys are all overlooking. ALL the codes are electrical. It makes a lot of difference.

If he has performance/ratio code(s), then I will agree the fluid could be a culprit. The computer knows the difference between these two. The ammeter in the computer is constantly measuring the electrical behaviour of the actuators and sensors. It knows the range of feedback expected. In electrical codes, its either the computer's signal is not reaching its destination, or the feedback is not reaching the computer (in the expected form/range). Electrical codes will trigger ratio and pressure codes, but I don't see how it could be the other way round.

Temperature sensors are thermistors so they cannot tell if they are sensing palm kernel oil or vaseline. I don't see a bad fluid taking it out.

Kashif:
My point is noting the difference between electrical and performance codes when it comes to transmissions. TSBs lead to card level repair, while techs look at component level repair. With electrical issues, it is better to test circuit and computer first (whenever possible) before the component.

From the TSBs, you will see that given the present codes where applicable, it never called for cvt fluid change. Nothing suggests that the fluid is a suspect. There is no P0840 and P0845 stored. Most OEM manuals will call for transmission replacement if the fluid is burnt, because some holding members are burnt. No TSB will call for transmission replacement if the temp sensor fails.

I am yet to see why the fluid is the bad guy in this case.

Iluv:
Thanks Guys,

Sorry I have been busy with work. I am tracking this issue for a friend.

He managed to take the car to the mechanic after I created this post.

The mech says he should replace the valve body and oil.

I actually told him to wait for feedback from here before he proceeds to a mech.

What do you think about this? Also if I could get contact from any of you guys, he could get the car across to you guys.

Thanks

Iluv:
Hello,

Can someone assist with a reputable transmission mechanic to help fix the following codes on a Nissan Altima 2008

P0710
P0720
P1777
P0175

The car refuses to engage any gear. it moved a bit after the nozzles were serviced and now it cannot change from gear 3 to 4.

Thanks.

Costee:

But of course most codes relating to the valve body are also electrical since circuits are involved. And yes ESMs will tell you to proceed from circuit test. I am not for the temp sensor in this (OP's) case, my hunch is for the SM, but clearly the first TSB associates the quality of the fluid with the three sensors either severally or collectively. Yes, changing the transmission is extreme but Nissan leaves no choice by not offering the sensors for sale as component units. The closest you'd get is the valve body.

Since you have P0175, I want to presume your car is 3.5L engine. In that case the model of your cvt is RE0F09B. The first three codes are related to the transmission, and if yours is 3.5L then I'll suggest you tackle P1777 (Step Motor) first. Nissan does not sell it as component unit, rather they'll suggest you change the valve body of which it's a part. The step motor is also used in the the Maxima and Murano of the same years. It's possible too that the step motor for earlier Murano trannys (RE0F9A) may be compatible. I'm saying this because you might be lucky to source locally as Tokunbo. You could also contact Kashif on these boards, seems he can easily source these SMs.
If your Altima is 2.5L, then the primary focus will be P0710, the CVT Fluid Temperature Sensor.

Perfectfuture87:




Hello all Nissan users,

Please guys, where can I buy a transmission CVT step stepper motor? My car refuses to engage any gear, some times it moves and stopped me on the high way but now has completely stop to move.

My car is a Nissan Altima 2.5s, 4-cylinder. From my research, I think the code is p1777. Please let me know if you have changed yours recently. I want to also confirm if it is the same code as what I stated here or a different code.. Thank you in advance.