AW55-50SN Valve Body 2004-2007, remanufactured and ready to install. Fits the AW55-50SN. Ships fast from the USA.
A Volvo, Saab, Saturn, Opel or Suzuki built on the AW55-50SN five-speed between 2004 and 2007 that shifts hard, slips between gears, or stores a pressure-control or shift-solenoid code is almost always telling you the valve body has worn past where the solenoids can compensate. This is a remanufactured valve body cast specifically to the 2004-2007 build of the AW55-50SN, so the bores, passages and connector layout match what came out of the car instead of an earlier or later revision that only looks similar.
The AW55-50SN is Aisin Warner's five-speed front-wheel-drive electronic automatic transaxle used across a wide range of 2001-2010 platforms. Inside it, the valve body is the hydraulic brain: line pressure from the pump routes through a stack of precision-machined bores and spool valves to apply each clutch pack and band, while the pressure-control and shift solenoids bolted to the valve body are what the transmission computer pulses to time every shift. Sonnax's diagnosis notes for this family point out a specific wear pattern - as the bores age, the ends develop a visible discoloration technicians call "moon phase" wear, and once that shows up the solenoid feeding that bore can no longer hold a steady, repeatable pressure no matter how good the solenoid itself still is.
Pull the stored code first. A pressure-control or TCC solenoid code can mean the solenoid itself failed, the valve body bore feeding it is worn, or a connector at the mechatronic unit has corroded - three different repairs with three different price tags. Our AW55-50SN service guide walks through separating a bad solenoid from bore wear before you spend on a full valve body, and covers a related "lost 3rd gear after a fluid service" trap that shows up on this same transaxle family.
This casting is built for the 2004-2007 AW55-50SN specifically - it is not the same part as the earlier castings used before 2004 or the revisions that came after 2007, even though all of them share the AW55-50SN name. Match your old unit's connector count and casting marks against the listing before ordering, or send your year and VIN so we can confirm. If you're not sure which casting your vehicle needs, the general AW55-50SN valve body listing and the wider 2000-2008 version cover more ground, and the valve body with solenoids version is worth a look if yours needs the solenoids replaced at the same time.
Service the fluid and filter in the same job - debris from the worn unit will contaminate a new valve body fast if it's still circulating in old fluid - and run JWS 3309 or an equivalent full-synthetic ATF rather than a generic Dexron product. Torque the valve body bolts to the factory sequence and spec, then run the transmission computer's adaptive relearn once the car has a few drive cycles on it, since skipping that step is the most common reason a good valve body still feels harsh right after install. If the sprag clutch or pump is also showing wear - a whining pump or one-way-clutch chatter on light throttle are the usual tells - pair this job with a sprag clutch or replacement pump so you aren't back in the pan a second time.
| Fits | AW55-50SN 2004-2007 |
| Part type | Valve Body |
| Condition | Remanufactured |
| 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.
It's the discoloration Sonnax's technical notes describe at the ends of worn valve body bores on this family. Once it shows up, the solenoid feeding that circuit can no longer get a steady, repeatable pressure no matter how good the solenoid itself is.
No. This casting is built specifically for 2004-2007 builds. For other years, see our general AW55-50SN valve body listing or the wider 2000-2008 version.
Harsh or flared shifts, slipping between gears, and converter shudder point to the valve body itself. A single stored code with otherwise normal shifting is more often just the solenoid on that circuit.
JWS 3309 or a full-synthetic ATF built to that specification, not a generic Dexron product.
Yes - run the adaptive shift relearn after a few drive cycles, or the transmission keeps shifting on pressure and timing values it learned from the old, worn valve body.
