Code Definition

P0A93 (347) — 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 sets when the hybrid vehicle control ECU detects insufficient cooling performance in the inverter cooling system. Subcode 347 specifically indicates that the coolant temperature in the inverter has risen above a calibrated threshold under certain load and ambient conditions, suggesting degraded cooling efficiency. The ECU uses data from the inverter temperature sensor and monitors coolant flow and temperature trends to detect anomalies.

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