AW55-50SN Valve Body 2005-2006, used and ready to install. Fits the AW55-50SN. Ships fast from the USA.
If your 2005 or 2006 Volvo, Saab or GM-badged AW55-50SN car is shifting harsh, slipping between gears, or has set a pressure-control or shift-solenoid code, the valve body is one of the most common wear points on this transaxle once the bores open up. This is a used AW55-50SN valve body pulled and matched specifically to the 2005-2006 build, so you install a working unit instead of reconditioning a worn core.
The AW55-50SN is a 5-speed front-wheel-drive electronic automatic, and the valve body is its hydraulic control center - it routes line pressure through precision bores and spool valves to each clutch pack, while the pressure control and TCC solenoids it carries time every shift and lockup event. Sonnax's own diagnosis writeup on this valve body family describes a solenoid modulator valve that feeds the linear solenoids and caps their pressure, and notes that worn bores on this unit show a distinctive discoloration pattern at the bore ends from the metal-to-metal wear.
Pull codes and note which shifts or lockup events are affected - Sonnax's writeup stresses inspecting all the valve sleeves and both pressure regulator valves rather than assuming a single bore is at fault, since this family tends to wear across several bores together rather than just one. Our AW55-50SN service guide covers the full diagnostic layout and the specific wear points Transmission Digest and Sonnax have documented on this unit, so read it before you pull the pan if you want to confirm the valve body is the actual fault.
This valve body is pulled and matched to the 2005-2006 model years of the AW55-50SN as built into Volvo, Saab, Nissan, Opel/Saturn and Suzuki applications from 2001-2010. Aisin Warner updated this valve body across that production span, so a unit from outside the 2005-2006 window is not guaranteed to match your solenoids and connectors even though the casting looks similar - match your year or send your VIN so we can confirm fit before you order. If your casting does not match this year range, our base AW55-50SN valve body listing covers the other production years we stock for this transaxle.
This transmission runs JWS 3309-spec ATF - do not substitute a generic Dexron fluid. Sonnax's writeup warns against mixing SLT and SLS solenoids between units without matching them correctly, since they are not interchangeable despite looking alike, so keep your old solenoids with your old valve body rather than cross-swapping parts between the two units. A separate ATRA case study on this family also documents a factory-style service error worth knowing before you start: the fill plug and the band anchor bolt on this transmission look alike, and removing the wrong one lets a band walk out of position and drops third gear entirely, which then requires pulling the transmission to fix. Torque every bolt to spec and double-check which one you are turning. Pair this swap with fresh fluid and, if your original complaint pointed at the pressure control circuit specifically, our pressure control solenoid or TCC solenoid may isolate the fault for less than the full valve body.
| Fits | AW55-50SN 2005-2006 |
| Part type | Valve Body |
| Condition | Used |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Aisin Warner updated this valve body's solenoids and connectors across its 2001-2010 production run. A unit from outside the 2005-2006 window can look the same but not match your car's wiring, so we sell this one matched specifically to those two model years.
Harsh or flared shifts, slipping between gears, torque converter clutch slip or shudder, and limp mode with a stored pressure-control or shift-solenoid code.
JWS 3309-spec ATF. Do not substitute a generic Dexron fluid in this transaxle.
No - Sonnax specifically warns against mixing SLT and SLS solenoids between units without matching them, since they are not interchangeable despite looking similar. Keep this valve body's solenoids with it.
Yes - ATRA has documented cases where the fill plug and a band anchor bolt on this unit look alike, and removing the wrong one lets a band walk out of position and drops third gear, requiring the transmission to come out to fix. Double-check which bolt you're turning.
Not necessarily. A pressure control solenoid or TCC solenoid alone can isolate that fault for less than replacing the full valve body if the bores themselves aren't worn.
