Remanufactured U340E valve body for Toyota Corolla and Yaris four-speeds with harsh 1-2 shifts, delayed engagement or slipping from worn bores.
If your Corolla, Yaris, Matrix or Scion xA/xB bangs into 2nd gear, hesitates before it takes off from a stop, or flares between shifts, the usual cause on the U340E four-speed is wear inside the valve body rather than the clutch packs behind it. This listing is a remanufactured U340E valve body, a single six-port aluminum casting that bolts in as a unit so you are not stuck transferring individual valves out of your old one.
The U340E is Aisin AW's compact four-speed automatic, and the valve body is where the computer's shift commands turn into actual hydraulic pressure. Fluid gets routed through a network of bores and spool valves to apply each clutch and band, while the solenoids bolted to the body carry out the shift timing and torque converter lockup the TCM calls for. As the bores wear oval with mileage, that pressure control degrades even though the solenoids themselves still test fine electrically.
Check the fluid condition and the pan magnet before you spend money on a valve body. Dark, burnt fluid with metal on the magnet points toward worn-out clutches instead, while clean fluid with a shift-quality complaint supports a valve body cause. Our valve body cleaning and inspection guide walks through pulling the pan, checking the separator plate, and testing the check balls before you condemn the part outright.
This remanufactured unit is a six-port aluminum casting built for the U340E four-speed transaxle as installed in the Toyota Corolla, Matrix, Yaris and Scion xA and xB across their 1.5L, 1.6L and 1.8L front-drive applications. The U340E family also includes the U341E and U341F variants with different port counts and solenoid layouts, so compare the ports and solenoid connectors on your original unit against the photos before ordering rather than going by model year alone. If your casting carries the P377402 number or a different port layout, see our P377402 U340E valve body instead, which covers a different application range within the same family.
Drain the fluid and drop the pan, pull the filter, then disconnect the solenoid connectors and the internal wiring harness before removing the valve body bolts - the bolt lengths differ by position, so keep them organized as you pull them. Lower the old unit straight down so the checkballs stay seated in the separator plate, and compare checkball positions and solenoid count against the replacement before you install it. Refill with Toyota WS fluid, which most references list for this transaxle family, and set the level at operating temperature rather than cold. A new filter and pan gasket are worth installing in the same job; our U340E master rebuild kit covers the full job instead if the clutch packs also need attention, and genuine Toyota WS fluid is worth having on hand before you start. Clear the adaptive shift memory and road-test through all four gears once the valve body is in, since skipping the relearn is the most common reason a good valve body still shifts rough for the first several miles.
| Transmission | Toyota U340E (listing also references U341E, U341F) |
| Condition | Remanufactured |
| Material | Aluminum |
| Ports | 6 |
| Shipping weight | 12.97 lb |
| Fitment | Toyota / Scion 1.5L, 1.6L, 1.8L front-drive applications incl. Corolla, Yaris, Scion xA, xB |
This is a remanufactured unit, a complete six-port aluminum casting that bolts in as one assembly rather than requiring you to transfer individual valves from your old body.
It is built for the U340E four-speed transaxle in the Toyota Corolla, Matrix, Yaris and Scion xA and xB across their 1.5L, 1.6L and 1.8L front-drive applications. Compare the port count and solenoid connectors on your original unit before ordering, since the related U341E and U341F variants differ.
Check the stored codes and fluid condition first. If a solenoid resistance check comes back normal and the fluid is clean, the valve body bores themselves have usually worn oval, which cleaning or a solenoid swap alone will not fix.
Most references point to Toyota WS fluid for the U340E family. Set the level at operating temperature rather than cold, and confirm against the fill-plug tag or your service manual.
Yes. Installing a new filter and pan gasket in the same job keeps debris from the old unit from circulating through the new valve body, and it is a small added cost compared to a second teardown later.
This is almost always a skipped adaptive relearn. Clear the TCM's adaptive shift memory and road-test through all four gears so it relearns clutch apply timing against the new valve body.
