DTC P0243-13: Turbocharger/Supercharger Wastegate Solenoid "A" Circuit Open [03/2023 - ]: Description

WARNING: This page is about a different car, the 2025 Lexus NX 350, 2024 Lexus NX 350, 2023 Lexus NX 350, and 2022 Lexus NX 350. However, it is still accessible from the selected car via links, so may be relevant.

The waste gate valve is built into the turbine housing with valve sub-assembly and is operated by the vacuum regulating valve assembly. The ECM uses duty control to open and close the vacuum regulating valve assembly. The amount of opening is controlled according to the operation status.

When the engine is started, the degree of opening of the waste gate valve is optimally adjusted so that the hot combustion gases passing through it flow directly into the catalyst. In the low-engine-load operating range, the waste gate valve opens to lower the exhaust manifold pressure to reduce pumping losses and improve fuel economy. Closing the waste gate valve increases the torque in the engine low-speed, high-load range to improve response during acceleration.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Note
P0243-13	Turbocharger/Supercharger Wastegate Solenoid "A" Circuit Open	Open or short in vacuum regulating valve assembly circuit for 1 second or more (1 trip detection logic)	Open or short in vacuum regulating valve assembly circuit Vacuum regulating valve assembly ECM	Comes on	SAE Code: P0243