U540E Transmission Solenoid Kit 6-Piece Shift and Lockup

A full six-piece solenoid set for the Aisin-built U540E, the 4-speed transverse automatic used in Toyota and Lexus front-drive and AWD models. Check the code on your transmission ID tag or build sheet to confirm it reads U540E. The set includes the on/off shift solenoids and the linear pressure-control and lockup solenoids, so you replace the whole bank at once instead of chasing them one at a time.

Worn U540E solenoids are behind a lot of the common complaints on this box: flare or slip on the 2-3 upshift, harsh engagement into drive, torque converter lockup shudder, and shift or lockup solenoid circuit codes such as P0750, P0755 and P0770. Once the fluid has gone dark and one solenoid has failed, the others are usually close behind.

On the bench: drain the fluid, drop the pan and filter, unplug the solenoid connectors and unbolt each solenoid from the valve body, noting which connector goes where. Install the new solenoids with clean O-rings lubricated in ATF, torque the bolts lightly, reconnect, and refill with the Toyota ATF specified in your owner's manual. Clear codes and let the ECU relearn shift adaptation over a few drive cycles. Confirm your transmission is the 4-speed U540E before ordering; the 5-speed U151E and 6-speed U660E use different solenoids.