Code Definition

P0A1D (159) — Hybrid PCM error

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Toyota

About P0A1D

P0A1D is a generic (obd-ii standard) powertrain diagnostic trouble code recorded for Toyota vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0A1D is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

This code with subcode 159 is set when the hybrid vehicle control ECU detects an internal fault in its output driver control circuits. These circuits generate the control signals that actuate components such as relays, the system main contactors, or the gate drive signals for the inverter and motor systems. The ECU monitors its own output control logic, and logs this code when it detects an internal open, short, or failure to drive a required signal. When set, the vehicle may fail to reach Ready, lose hybrid drive, or enter reduced power failsafe, with the hybrid system and master warning lamp...

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