P0AA6critical severityPowertrain
Hybrid Battery Voltage System Isolation Fault
on 2023 Chevrolet Bolt EUV 65 kWh Single Motor FWD · FWD
What this code means
The hybrid control system detects a loss of electrical isolation between the high-voltage battery system and the vehicle chassis. This is a safety concern involving potential high-voltage leakage.
Symptoms
- Hybrid system warning light
- Vehicle may not start
- Reduced or disabled hybrid operation
Common causes
- Damaged high-voltage wiring insulation
- Moisture in high-voltage components
- Faulty battery pack isolation
- Failed high-voltage component ground
Diagnostic steps
- Scan hybrid system codes safely
- Inspect high-voltage cables and connectors
- Test isolation resistance of HV system
- Check for moisture intrusion in components
🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
✓ ANCEL official store
Serious DIY~$100
BlueDriver Pro →
Enhanced codes (ABS, airbag, TPMS) plus repair reports.
SHOP FAVORITEShop-grade tablet~$300
Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.
Other Powertrain codes on this vehicle
P0005
Fuel Shutoff Valve A Control Circuit/Open
P0006
Fuel Shutoff Valve A Control Circuit Low
P0007
Fuel Shutoff Valve A Control Circuit High
P0008
Engine Position System Performance - Bank 1
P0009
Engine Position System Performance - Bank 2
P0026
Intake Valve Control Solenoid Circuit Range/Performance Bank 1
P0027
Exhaust Valve Control Solenoid Circuit Range/Performance Bank 1
P0028
Intake Valve Control Solenoid Circuit Range/Performance Bank 2
P0029
Exhaust Valve Control Solenoid Circuit Range/Performance Bank 2
P0033
Turbocharger/Supercharger Bypass Valve Control Circuit