N436 and N440 are pressure control valves located in the mechatronic unit that regulate the hydraulic pressure of clutches K1 and K2. They operate according to signals from the Transmission Control Unit (TCU) and precisely adjust the oil pressure delivered to the clutch pistons. Accurate pressure regulation ensures smooth take-off, proper torque transfer, and comfortable gear shifts.

If these valves malfunction, symptoms may include clutch slip, shudder, harsh or delayed shifting, and activation of limp mode. N436 typically controls clutch K1, while N440 controls clutch K2, and both are critical for the balanced and safe operation of the dual-clutch system.