Does anyone know if the older solenoids will work in my 31825AA090 valve body-
I can't be for certain .But think about this ,I used a Dorman 926-408 TCC Solenoid that isn't supposed to fit my 13 Crosstrek ,but used it any way .been working fine since Thanksgiving.
Mr Subaru YT channel was the guide I used .Tranny is TR580.

 

Really? i'm surprised. no issues?

 

Do you have more than 60,000 miles? If not, surely the transmission valve body is covered under the 5 year 60,000 mile powertrain warranty.

You could also contact Subaru to see if they can help. Every few years they seem to add additional coverage to the CVT. Currently I believe the 10 year 100,000 mile warranty extension goes to 2018.

 

I'm at 130K miles! My daily commute is about 150 miles, so the miles add up very quickly! I did double check with the dealership and they couldn't offer any help. Thanks for your thoughts!

 

Thank you for comments! I am also considering just trying the Dorman solenoid and seeing what happen! I'm glad it worked out for you!

 

Any updates ?

 

2023 Crosstrek 80k miles and I have the same issue. Would love to know if this is something I should try to DIY.

 

It is pretty easy to remove and replace the valve body. However, my 2021 is so new that there wasn't any solenoids marketed specifically for it. I bought the Doorman solenoid anyway and took the valve body out, hoping it would fit. The configuration and number of solenoids were different from anything else I could find on the internet/youtube, so I didn't even attempt to replace it (I couldn't be sure which solenoid was the TCC). I did test the resistance of each of the three solenoids (vs 4 I think for older models) and they were all the same at 10-13 ohms, so nothing obviously wrong with any of them. So, I just put the valve body back in. Oddly, after replacing the valve body, my issue went away. No doubt in my mind that it will come back.

 

Maybe these files can help.

 

Thank you! Very helpful! Now I just need to know which of the three solenoids is the TCC solenoid.

 

Unless I'm misled from service manuals, I find them unfriendly. You might be able to find better info from online searches, including videos. And there are members here with knowledge. Perhaps one will step in and offer info.

 

To preface: I quit Subaru in 2019 so I have not had the valve body out of a '21.
Based on what I see in the FSM it appears to be the solenoid with the white wire (pin 9 on the valve body connector). If you pull the valve body be sure to replace those two valve body O-rings with new ones at that mileage.

Since the fault is not a circuit range issue (high or low) I would most likely diagnose for a mechanical issue - either the solenoid is stuck or the clutch in the converter is not locking fully. The fact that your solenoid resistance is in range leads that direction - 99% of all lock-up solenoids I have failed are out of spec on coil resistance cold.

The one other issue I have found for that code is the O-ring on the input shaft on higher mileage cars. That allows lock-up pressure to leak and the clutch will not remain engaged.
This can be verified by recording lock-up duty cycle for the solenoid, engine RPM, and turbine speed during a drive cycle. Normally as lock-up duty cycle increases the RPM and turbine speeds will begin to match -within 50 RPM or less. In these cars the duty cycle will be steady high reading and the lock-up clutch fully engaged above 7 to 10 MPH. Any variance or fluctuation of that RPM match indicates slip. Subaru does not provide info to verify the actual hydraulic pressure for the converter (something we used to do a couple/three decades ago) so you have to make an educated guess in reading the data and even comparing the solenoid current draw with an oscilloscope during an "event".
That input O-ring is #G92007 below.

 

Thank you, Elbert, for your thorough reply! It would have taken me a long time to write up such a detailed explanation if I had your knowledge! If my issue returns, I'll at least know which solenoid to focus on and a likely alternate solution if that wasn't the cause.