P0A93 on Lexus
Inverter Cooling System Performance
P0A93 on Lexus vehicles indicates inverter cooling system performance. Au7o has documented this code across 1 Lexus model — most commonly on CT. 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 Lexus range from $500 to $1,200, 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 Lexus by Model
Lexus CT(1 issue)
- Electric Water Pump Premature Failure2011-2017
The electric water pump on the CT200h hybrid system fails prematurely, causing coolant circulation loss for the hybrid inverter and electric motor. Unlike conventional belt-driven water pumps, this is an electric unit that controls coolant flow to the high-voltage hybrid components. Failure can lead to hybrid system overheating and shutdown.
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View P0A93 across all makes →Frequently Asked Questions
What does P0A93 mean on Lexus?▼
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 Lexus specifically, this code is documented across 1 model.
What causes P0A93 on Lexus vehicles?▼
Common causes on Lexus: 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 Lexus?▼
Repair costs on Lexus range from $500 to $1,200, depending on the specific model and root cause.
Which Lexus models have P0A93 documented?▼
Au7o has documented P0A93 on 1 Lexus model: CT.