Code Definition

P0A93 — Inverter cooling system performance

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

About P0A93

P0A93 is a generic (obd-ii standard) powertrain diagnostic trouble code. 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

The inverter that drives the hybrid or EV motors generates significant heat and relies on active cooling, typically a dedicated electric coolant pump and coolant loop with its own radiator, to stay within safe operating temperature. DTC P0A93 sets when the control module detects insufficient inverter cooling performance, either because the inverter temperature rises beyond allowable limits or because coolant flow, the temperature differential across the inverter, or pump operation falls outside the expected range. The most common causes are a weak or failed coolant pump, low coolant, or air an...

Join TaT to view the complete code information and diagnostic details.

Quick Facts