What Does P0A93 Mean?
DTC P0A93 indicates the cooling system for inverter 'A' is not performing adequately. Inverters convert DC battery power to AC for the drive motors and generate significant heat during operation. Each inverter has a dedicated liquid cooling circuit, and this code means the cooling system cannot maintain the inverter within safe temperature limits. Overheating will cause the system to derate power output to protect the power electronics.
Safety Warning
An overheated inverter will derate power output, potentially causing sudden loss of acceleration capability. In severe cases, the inverter may shut down entirely, disabling the electric drive system. Extreme overheating can damage expensive power electronics (IGBTs/MOSFETs) requiring costly replacement.
Common Causes
30%
Failed or underperforming electric coolant pump in the inverter cooling loop
25%
Low coolant level in the inverter cooling circuit due to a leak
20%
Blocked or restricted coolant passages in the inverter heat sink or radiator
15%
Faulty inverter temperature sensor providing inaccurate readings
10%
Degraded thermal interface material between the inverter power modules and heat sink
Diagnostic Steps
1
Check the inverter coolant level in the dedicated reservoir — top off and inspect for leaks if low.
2
Verify the electric coolant pump is operating — listen for the pump running and feel for coolant flow in the hoses when the system is active.
3
Monitor inverter temperature via scan tool under load — compare to ambient and coolant temperature to assess cooling effectiveness.
4
Inspect the inverter cooling circuit radiator for blockage, debris, or damage that would reduce airflow.
5
Check for air trapped in the cooling circuit — bleed the system per manufacturer procedure, as air pockets can cause localized overheating.
6
If the pump and circuit are functional, the inverter's internal thermal path may be degraded, requiring inverter replacement.
Estimated Repair Cost
$300 - $3,000
Parts + labor, varies by vehicle and location
DTC P0A93 indicates the cooling system for inverter 'A' is not performing adequately. Inverters convert DC battery power to AC for the drive motors and generate significant heat during operation. Each inverter has a dedicated liquid cooling circuit, and this code means the cooling system cannot main...
The most common cause of P0A93 (Inverter "A" Cooling System Performance) is: Failed or underperforming electric coolant pump in the inverter cooling loop
Typical repair costs for P0A93 range from $300 to $3,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
An overheated inverter will derate power output, potentially causing sudden loss of acceleration capability. In severe cases, the inverter may shut down entirely, disabling the electric drive system. Extreme overheating can damage expensive power electronics (IGBTs/MOSFETs) requiring costly replacement.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0A93 to identify the root cause.
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Quick Info
Category
Powertrain
System
Inverter Cooling System
Difficulty
Type
Generic (SAE)
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