DTC P16B4-79: Multi Flow Control Valve Stopper Mechanical Linkage Failure [09/2023 - ]: Description

WARNING: This page is about a different car, the 2024 Lexus TX 500h. However, it is still accessible from the selected car via links, so may be relevant.

The water control valve shaft is fixed to the center of the ball valve, and its role is to transmit the rotational drive torque transmitted from the internal DC motor via the gear to the ball valve.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P16B4-79	Multi Flow Control Valve Stopper Mechanical Linkage Failure	Both of the following conditions are met for 0.5 seconds (2 trip detection logic): Ball valve of water control valve operates beyond the upper limit stopper during forced operation immediately after ignition switch off Ball valve of water control valve operates beyond the lower limit stopper during forced operation immediately after ignition switch off	Water control valve	Comes on	Engine	B	SAE Code: P16B4 DTC for Mexico Models: Applies