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Home >> Toyota >> 2025 >> Prius Plug-In Hybrid SE >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Hybrid Battery System (HEV) - Diagnostic Codes (1 Of 2)) >> HYBRID BATTERY SYSTEM (for M20A-FXS) >> DTC P0A1D-94: Hybrid/EV Powertrain Control Module Unexpected Operation [12/2022 - ] >> Description

DTC P0A1D-94: Hybrid/EV Powertrain Control Module Unexpected Operation [12/2022 - ]: Description

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The battery ECU assembly monitors the hybrid vehicle control ECU via CAN communication. If the battery ECU assembly detects that the hybrid vehicle control ECU is malfunctioning, it will illuminate the MIL and store a DTC.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate DTC Output from Priority Note
P0A1D-94 Hybrid/EV Powertrain Control Module Unexpected Operation Hybrid vehicle control ECU internal malfunction:
An abnormal signal from the hybrid vehicle control ECU is detected by the battery ECU assembly.
(1 trip detection logic)
Hybrid vehicle control ECU Comes on Master Warning:
Comes on
HV Battery A SAE Code: P0A1D