P0A93 on Toyota
Inverter Cooling System Performance
P0A93 on Toyota vehicles indicates inverter cooling system performance. Au7o has documented this code across 2 Toyota models — most commonly on Highlander, 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 $1,100, 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 Highlander(1 issue)
- Hybrid Inverter Coolant Pump Failure (Inverter Overheat) — P0A05 / P0A932006-2019
The Highlander Hybrid uses a dedicated electric water pump to circulate coolant through the power inverter/converter, which runs separately from the engine cooling system. The electric pump wears out and stops circulating coolant, allowing the inverter and hybrid electronics to overheat. Failures often present with little warning beyond a check engine light and hybrid warning lights; if ignored, the inverter itself (a far more expensive component) can be damaged. Owners report this most on the 2006-2010 generation but it recurs across later hybrids.
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 2 models.
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 $1,100, depending on the specific model and root cause.
Which Toyota models have P0A93 documented?▼
Au7o has documented P0A93 on 2 Toyota models: Highlander, Prius C.