P0AA6

Hybrid/EV Battery Voltage System Isolation Fault

Severity

🚨 Critical

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$167–1111 (est.)

Symptoms

Check Engine light comes on
High voltage system fault warning appears
Reduced vehicle performance
The car may go into emergency mode
Possible charging problems (for PHEV/EV)

Causes

Damage to the insulation of high-voltage cables
Problems with high voltage battery
Damage or contamination of high voltage components
Insulation monitoring system malfunction
High Voltage System Grounding Problems

How to Fix

Conduct diagnostics of the high-voltage system using special equipment
Check the insulation integrity of all high voltage components
Inspect the high-voltage battery for damage
Check the operation of the insulation monitoring system
Repair only from an authorized dealer

Related codes

P0AA7 P0AA8 P0AA9