DTC P0A1F-94: Hybrid/EV Battery Energy Control Module Unexpected Operation [12/2023 - ]: Description

WARNING: This page is about a different car, the 2024 Lexus TX 550h+. However, it is still accessible from the selected car via links, so may be relevant.

The hybrid vehicle control ECU assembly (main CPU) monitors the battery ECU assembly and stores this DTC when it detects a malfunction.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Warning Indicate	DTC Output from	Priority	Note
P0A1F-94	Hybrid/EV Battery Energy Control Module Unexpected Operation	The battery ECU assembly value received by the hybrid vehicle control ECU assembly (main CPU) exceeds the threshold for a certain period of time. (1 trip detection logic)	No. 1 HV supply stack sub-assembly No. 2 HV supply stack sub-assembly No. 3 HV supply stack sub-assembly No. 4 HV supply stack sub-assembly Battery voltage sensor	Comes on	Master Warning: Comes on	Hybrid Control	A	SAE Code: P0A1F