Community Member Credit: Benzolorenzo1
About 6 months ago I received the death code P1778 (stepper motor) in my 2008 Altima. I searched far and wide, low and high, only to be told 2 things… you need a new transmission, or you need a new valve body. Since I didn’t have $2500 for a new trans, let alone $800 for the valve body I decided to look into this a little further. watched a YouTube video the only one I could find was a Nissan armada, but thought what the hell. I drained the fluid, dropped the pan, yanked out the valve body, and found that little bastard that gave me such trouble.
Now with part in hand I went to my local parts store, and told we don’t sell that part, its not even in our system… went to the dealership, told the same thing and was told I needed to buy a new transmission as they are not “serviceable” funny but I had the part in hand, how can it be not serviceable?
Lastly I took a gamble, I went to eBay, ordered a stepper motor. 20k miles later, still no code, no whine, and no lock up.
Part Number: 203452A
Description: JF011E RE0F10E F1CJA Transmission CVT Stepper Motor For SENTRAN Nissan Dodge Refurbished
Here is how I saved thousands and bought a $35 part.
- Drain fluid.
- Drop pan (clean with brake cleaner)
- Remove the 3 bolts holding filter. (clean with brake cleaner while your at it)
- Remove the valve body about 11 bolts
- Remove the stepper motor from the top of the valve body (the side you can’t see with the pan off) 2 bolts
- Replace with the new stepper motor found here https://www.ebay.com/itm/282288900117 or https://www.ebay.com/itm/183910578995
- Take a piece of dental floss about a foot long and hold the spring loaded arm back against the stepper motor and return the valve body back to the transmission.
- After you have a few bolts in place remove the floss before you tighten all the way.
- Reconnect trans filter and bolt back into place.
- Rejoin the fluid pan to the transmission and replace with quality CVT fluid. Amsoil makes a great product.
I hope this helps and if you have questions please feel free to ask.
Video How-to (Many thanks to Budget Drift for this)