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Home >> Toyota >> 2025 >> Prius Plug-In Hybrid SE >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (Hybrid Control System (HEV) - Diagnostic Codes (1 Of 4)) >> HYBRID CONTROL SYSTEM (for M20A-FXS) >> DTC P0A1F-94: Hybrid/EV Battery Energy Control Module Unexpected Operation [12/2022 - ] >> Description

DTC P0A1F-94: Hybrid/EV Battery Energy Control Module Unexpected Operation [12/2022 - ]: Description

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The hybrid vehicle control ECU (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 (main CPU) exceeds the threshold for a certain period of time.
(1 trip detection logic)
Battery ECU assembly Comes on Master Warning:
Comes on
Hybrid Control A SAE Code:
P0A1F