Code Definition

P0A93 (346) — Inverter cooling system performance

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

About P0A93

P0A93 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.

When P0A93 is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour.

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 P0A93 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 DTC indicates that the hybrid vehicle control ECU has detected abnormal inverter coolant temperature behaviour consistent with reduced or no coolant flow. Subcode 346 typically points to a mechanical or electrical malfunction in the inverter water pump circuit, causing insufficient coolant circulation. The ECU uses the inverter temperature sensor to monitor how quickly the coolant temperature rises under load. If the temperature rises too rapidly or remains high without expected cooling, the ECU sets this fault.

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