P0A93 on Toyota
Inverter Cooling System Performance
P0A93 on Toyota vehicles indicates inverter cooling system performance. Au7o has documented this code across 1 Toyota model — most commonly on Prius C. This hybrid/electric code means the computer detected that the inverter's cooling system isn't performing well enough to keep the inverter at a safe temperature. The inverter converts high-voltage DC battery power to AC for the drive motors (and back), and it has its own dedicated liquid-cooling loop with an electric pump. When coolant flow or temperature stays out of range — meaning the inverter is overheating or at risk of it — this code sets. It commonly points to a weak inverter coolant pump or low/blocked coolant, and continuing to drive risks expensive inverter or hybrid-system damage. Typical repair costs on Toyota range from $200 to $600, depending on the specific model and root cause.
Common Causes of P0A93
- •Failed or weak inverter (high-voltage) coolant pump
- •Low coolant level or air pocket in the inverter cooling loop
- •Coolant leak in the hybrid cooling system
- •Clogged or restricted inverter cooling radiator/heat exchanger
- •Kinked or blocked coolant hose
- •Faulty coolant temperature sensor or pump wiring
- •Contaminated or degraded coolant
P0A93 on Toyota by Model
Toyota Prius C(1 issue)
- Inverter Coolant Pump Failure and Hybrid System Overheat2012-2019
The Prius C has a separate cooling circuit for the power electronics (inverter/converter). The electric pump that circulates coolant through this circuit can fail, causing the inverter to overheat. When the inverter overheats, the hybrid system enters a protective shutdown mode, displaying "Hybrid System Malfunction" and severely limiting power output. The pump failure is often caused by coolant contamination or bearing wear.
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View P0A93 across all makes →Frequently Asked Questions
What does P0A93 mean on Toyota?▼
P0A93 stands for "Inverter Cooling System Performance." This hybrid/electric code means the computer detected that the inverter's cooling system isn't performing well enough to keep the inverter at a safe temperature. The inverter converts high-voltage DC battery power to AC for the drive motors (and back), and it has its own dedicated liquid-cooling loop with an electric pump. When coolant flow or temperature stays out of range — meaning the inverter is overheating or at risk of it — this code sets. It commonly points to a weak inverter coolant pump or low/blocked coolant, and continuing to drive risks expensive inverter or hybrid-system damage. On Toyota specifically, this code is documented across 1 model.
What causes P0A93 on Toyota vehicles?▼
Common causes on Toyota: Failed or weak inverter (high-voltage) coolant pump, Low coolant level or air pocket in the inverter cooling loop, Coolant leak in the hybrid cooling system, Clogged or restricted inverter cooling radiator/heat exchanger, Kinked or blocked coolant hose. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0A93 on a Toyota?▼
Repair costs on Toyota range from $200 to $600, depending on the specific model and root cause.
Which Toyota models have P0A93 documented?▼
Au7o has documented P0A93 on 1 Toyota model: Prius C.