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Home >> Toyota >> 2025 >> Prius Plug-In Hybrid SE >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (Motor Generator Control System (HEV) - Diagnostic Codes (1 Of 5)) >> MOTOR GENERATOR CONTROL SYSTEM (for M20A-FXS) >> DTC P0A1B-94: Drive Motor "A" Control Module Unexpected Operation [12/2022 - ] >> Description

DTC P0A1B-94: Drive Motor "A" Control Module Unexpected Operation [12/2022 - ]: Description

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When the separate microcomputers within the motor generator control ECU (MG ECU) that monitor each other detect an abnormality in the information, a DTC is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate DTC Output from Priority Note
P0A1B-94 Drive Motor "A" Control Module Unexpected Operation When the separate microcomputers within the motor generator control ECU (MG ECU) that monitor each other detect a value in the information that differs from what is expected for a specified period of time.
(1 trip detection logic)
  • Inverter with converter assembly
  • IGCT-MAIN NO. 1 relay
Comes on Master Warning:
Comes on
Motor Generator A SAE Code:
P0A1B