top of page
Toyota P0A91 Code – Hybrid Inverter Coolant Fault
Limited
Safe to drive :
Toyota hybrid vehicles only
Applies only to :
Not applicable to :
This explanation does NOT apply to other brands.
Medium
Severity level :
When Does This Code Appear on the Vehicles
P0A91 occurs when inverter detects cooling system fault.
What This Code means on the Vehicles
Toyota-specific inverter coolant circuit malfunction.
Why This is different from a generic OBD2 Code
Generic scanners cannot detect Toyota inverter coolant-specific issues.
Common Situations That Trigger This Code
Pump failure; Blocked coolant line; Sensor fault.
What Will NOT Fix This Code
Ignoring coolant alert; Replacing unrelated components.
How to Clear This Code on Vehicles
Inspect coolant system; verify flow; clear code with Techstream.
Related Manufacturer Specific Codes
Toyota P0A90; Toyota P0A92
bottom of page