No Obvious Driving Issues, But Multiple Codes

Brian Owner/Technician Detroit Lakes, Minnesota Posted   Latest  
Question
Driveability
2014 Subaru Forester 2.5i Premium 2.5L (FB25BA) (TR580)—JF2SJAEC1EH552177
B1501
U0073 - Control Module Communication Bus "A" Off
C1431
P0971 - Pressure Control Solenoid "C" Control Circuit High

Vehicle was in for standard rear brake job about 500 miles earlier. Owner drives into a gas station, filled with gas, restarts engine and the dash lights up. AT temp light flashing, ABS ,TRAC, lights are on, and of course the cruise does not work. but, NO CHECK ENGINE LIGHT. Scan data does not show anything out of specs. Have done plenty of research, not finding much. I think it could be as simple as a brake light switch(glitch) which the dealer already has done on the recall. Turning the ignition off will reset all the lights until the vehicle moves. I did recommend taking to the dealer for a look but he is hesitant until I have exhausted all possibilities.

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Hollis Technician
Boulder, Colorado
Hollis Default
   

Perform the diagnostic for P0971 first. Load the solenoid circuit with approx. one amp, then check resistance. Check the battery SoH & SoC, load test it, connections between terminal and battery post must be clean. How many miles on the odometer ? Have you cleared the codes and test driven, see if it's reproducible ?

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Bill Owner/Technician
Jackson, Michigan
Bill Default
 

Brain - you have a transmission fault code (P0971) which is causing the indicators to come on. Follow testing procedure for the Solenoid fault. I have see this issue be caused by solenoid/valve body issues.

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Eric Owner/Technician
Grand Rapids, Michigan
Eric Default
 

Subaru sells the complete valve body, I don't believe individual solenoids are available. Fairly easy to change, mounts right on top of transmission. The trans ecu is under left side of dash, easy to access connector and check resistance. You'll laugh at the huge rubber sheet they supply as a debris barrier? Suggest a drain and fill of trans fluid at same time, again, fairly easy procedure.

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Jared Diagnostician
Essex, Maryland
Jared Default
 

I have replaced the valve body so many times in these TR580 trannys for either the Lockup Duty solenoid failing (so common). I then started using solenoids from amazon. They are there. They are chinese, dont feel as good in your hand, but they work. The customer is aware that we are saving them a ton of money by using non OEM parts to repair this. A whole VB is not needed! Also, fill the tranny…

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Hollis Technician
Boulder, Colorado
Hollis Default
 

I just got an email from a friend, he just fixed a P0971 on a 2011 Outback CVT. He found a loose pin / terminal fit at the transmission 20 pin connector. Back probe you circuit wire and wiggle the other side.

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Brian Owner/Technician
Detroit Lakes, Minnesota
Brian Delay
 

I am sending the vehicle to the dealer as I have injured myself and my shop will be closed for a time. I asked the owner to give me full details so I can post the findings here. Thank you for the support.

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Hollis Technician
Boulder, Colorado
Hollis Default
 

Wow! Sorry to hear, hope it's not too serious. Best Wishes Hollis

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