When you replace a CVT, the TCM that was originally used with the replacement CVT should also be included. The "IP" Char data is stored in the Valve Body on the replacement CVT, and needs to be read into your original TCM by using a scanner to erase the old data. Once erasure is performed, the new data is automatically read-in. If that wasn't performed, then your TCM is trying to run the tranny with data from the old VB. All kinds of garbage-performance can result.

 

yes it can

 

I change my fluid every 30k, did a pan drop and filter at about 90k, and got a P0746 code today at 160,000 miles, along with P0500, and P2765. I had just changed the fluid a few weeks ago too. I have an AUX cooler as well.

I was coasting down a steep hill when this occurred, as the trans braking had the RPMs up to 3500
as I was coasting. One of the pulleys may have had some over-speed on the hill to set those, who knows.

I then went up a small grade, the RPMs tanked, the car vibrated then came out of gear, well, the clutches let go. Would not go back into drive or reverse. Had to be towed.

 

Trans is likely broke.

 

Everyone goes there, and are wrong 68% of the time. I believe
changing the sensor, and clearing the TCM will either fix it, or
just temporarily. I put a cooler on this right after I bought it,
and have done fluid changes every 30,000 miles, and with the
cooler, it comes out almost as red as it went in.

I will not conclude the trans is broken.

 

With the killer magnets they use you may easily find very clean fluid. Some of the most destroyed transmissions I've seen had beautiful looking fluid in them.

Those transmissions have 800 psi fluid pumps and why they tear up when the fluid friction alone eats the pressure making parts. Common to find severe erosion in them like found by heavy sandblasting and it tends to eat the pressure reading parts. That and Nissan refusing to use the better heat treats to make the wear parts harder to resist that are why the transmissions do not commonly last. Look how many variators seize up on the sliding surfaces due to it (youtube has plenty of vids on it) and why the chainbelts break so often. And why everybody's favorite part to change is the stepper which often get bought for nothing.

I said likely on broken, you never know until you get inside. Front and back of trans are arguing and why the two speed sensors posted codes like broken. The pressure performance likely due to pressures gone out of range like dead parts make.

Good luck..............

 

I have already dropped the pan and did a fluid and filter change, and cleaned the
magnets. The color of the fluid is not effected by what the magnets
pick up. It was dark the first change, at 85K, and I have driven it to 160K
and changed it continually at every 30 - 40k.

There is also and AUX cooler on the trans, I installed it myself.

The CVT8 does not have a stepper motor.

I cannot afford $5500 for a replacement owing $9000

 

Ground up aluminum easily changes fluid color and the magnets won't grab it.

You may find this of some interest.........

Recalibrating Nissan CVT8 - Transmission Digest

Learn how to save time and money by reprogramming Nissan/Jatco CVT transmissions using Nissan's online service, avoiding dealership visits.

www.transmissiondigest.com

 

Yeah, I read that a while ago, but you still need the Consult software that NTB12-103f
specifies.

I found a 2017 CVT for $1225 with 44K miles on it...

I am not concerned with any fluid color information...

 

You heed to be, it is a clear indicator of the life of the fluid and the stress trans has gone through. I can tell the difference in fragged CVT fluid at 15K miles. It's what talked me into regular 30K changes on mine. By 30K the difference in fluid old and new was so visible you'd be blind not to see it and on a good working transmission. If you go 60K before the first change I will flat state you are looking at a 50% chance of an early fail on those.

Whatever, I certainly know nothing. But I have rebuilt every ATX I ever had with no formal training and they better last at least 10 more years after, in fact I haven't broken one I rebuilt yet.

That '17 may well work............

 

I ended up getting the trans replaced. I found a local shop that:

Picked up the car.
Replaced the Trans (filters, fluid).
Washed the car.
Delivered the car.
$2500 Cash - Yes, $2500 Cash.

Belt broke in the other one. I wanted to get it back, but I never
had the time to pick it up...

 

they replaced the transmission? with a used one? How did they change the filter without removing the valve body? I'm curious about that one

 

Shoulda grabbed it. Tearing CVT apart gives you a world of insight into why they tear up so easy. That and knowing the oil pumps need as much pressure as a battleship.

 

We replace Nissan CVT's at 85K miles all the time. The lowest I've seen was 68K miles. I've seen them last as high as 165K miles, but on average we see them at around 85K miles.