Complete control valve body for the Subaru TR580 Lineartronic CVT, replacing 31825AA050/AA051/AA052 on Forester, Outback, Impreza and XV Crosstrek.
A shudder or judder under light throttle between 20 and 40 mph, delayed engagement into drive or reverse after a cold start, a lit AT temp light, or a stored P0841 pressure code are the usual reasons a Subaru Forester, Outback, Impreza or XV Crosstrek with the TR580 Lineartronic CVT ends up here. This is a complete control valve body assembly for the TR580, superseding Subaru part numbers 31825AA050, 31825AA051 and 31825AA052 and carrying the 163740B casting reference.
The TR580 is a chain-drive continuously variable transmission, and unlike a geared automatic it has no fixed ratios to fall back on - the valve body's job is to hold primary and secondary pulley pressure steady enough that the chain never slips while the pulleys change ratio continuously. Subaru's own service bulletins describe exactly how that goes wrong: contamination in a fluid pressure solenoid valve can set a false P0841, and testing on the original valve body found that air bubbles can enter certain pressure circuits and cause fluid pressure to be calculated incorrectly, which Subaru addressed with a redesigned valve body for the TR580 and TR690.
Subaru's bulletin 16-111-18R documents the same fault from the software side: a TCM reprogram was released specifically to let the fluid pressure solenoid discharge contamination that was setting P0841 on 2018MY Legacy, Outback and Forester CVTs, so a current TCM calibration is worth checking before you replace hardware. If the reprogram is already current and the code returns, the contamination or air-bubble issue is in the valve body itself rather than the software. Our Lineartronic CVT service guide covers the fluid check procedure and common failure points across the Outback, Forester, Crosstrek and Legacy, and our solenoid testing guide walks through checking an individual pressure solenoid before you commit to the full assembly.
This valve body is built for the TR580 as used in the 2011-2016 Forester, 2010-2016 Impreza, 2009-2016 Outback, 2012-2014 XV, 2013-2014 XV Crosstrek, 2014-2016 Levorg and 2012-2016 Exiga. Subaru revised this valve body several times, and the improved design that addresses false P0841 detection covers 2010-2017 Legacy and Outback, 2014-2017 Forester, 2012-2017 Impreza, 2013-2017 Crosstrek and 2015-2017 WRX with the TR580 or TR690, so compare your casting marks and connector count against the photos here, or send your year and VIN so we can confirm the exact revision. The full CVT parts collection has everything else we stock for continuously variable transmissions.
This ships as a complete assembly with the solenoids and separator plate already in place, so there is nothing to transfer from the old unit - drop the pan and filter, note the solenoid harness routing before you disconnect it, and bolt the new assembly in working from the center out in a spiral pattern so the separator plate seats flat. Refill with genuine Subaru CVTF-II fluid, or an Idemitsu Type SB2 equivalent if you prefer, and perform the fluid level check at the specified fluid temperature rather than guessing from the dipstick cold - that temperature-referenced check is the step most comebacks trace back to. If your original complaint was a solenoid-specific code rather than a hard shudder, a TR580 solenoid kit or the AWD transfer clutch solenoid kit may fix it for less than the full valve body.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It's built for the TR580 as used in the 2011-2016 Forester, 2010-2016 Impreza, 2009-2016 Outback, 2012-2014 XV, 2013-2014 XV Crosstrek, 2014-2016 Levorg and 2012-2016 Exiga. Subaru revised this valve body across those years, so match the casting marks and connector count against the photos, or send your year and VIN to confirm.
It's a fluid pressure sensor/circuit code. Subaru's own bulletins trace it to contamination in the fluid pressure solenoid, or to air bubbles entering pressure circuits in the original valve body and causing pressure to be calculated incorrectly.
Check for the TCM reprogram covered in Subaru bulletin 16-111-18R first, since it lets the pressure solenoid discharge contamination without new hardware. If the code returns after that update, a solenoid-specific kit can sometimes fix a solenoid-only fault for less than the full assembly.
Genuine Subaru CVTF-II, or an approved Type SB2 equivalent. Check the fluid level at the specified fluid temperature rather than cold, since a cold check reads wrong.
Yes - it ships as a complete assembly with the solenoids and separator plate already fitted. It's a direct replacement, not a remanufactured core exchange, so there's no core to return.
Note the solenoid harness routing before you disconnect it, and torque the bolts working from the center out in a spiral pattern so the separator plate seats flat.
