P0AA6 on GMC
Hybrid Battery Voltage System Isolation Fault
P0AA6 on GMC vehicles indicates hybrid battery voltage system isolation fault. Au7o has documented this code across 1 GMC model — most commonly on Hummer EV SUV. P0AA6 is a hybrid/EV code meaning the battery management system detected an isolation (insulation) fault between the high-voltage battery system and the vehicle's chassis ground. For safety, the high-voltage system is normally electrically isolated from the metal body; this code sets when the measured insulation resistance drops too low, suggesting current could leak to the chassis. This is treated as a serious safety concern and often disables hybrid/EV operation or limits propulsion. The vehicle should be inspected by a qualified hybrid technician, as high-voltage components can pose a shock hazard.
Common Causes of P0AA6
- •Moisture or coolant intrusion inside the high-voltage battery pack
- •Damaged or chafed insulation on high-voltage cables
- •Corrosion or water in high-voltage connectors
- •Failed or leaking battery cell/module
- •Faulty inverter, converter, or A/C compressor (high-voltage components)
- •Damaged high-voltage wiring rubbing against the chassis
- •Failed battery isolation/monitoring sensor
P0AA6 on GMC by Model
GMC Hummer EV SUV(1 issue)
- DC Fast Charging Session Interruption2024-2025
DC fast charging sessions terminate prematurely or fail to initiate at certain charger networks. Communication errors between the vehicle and charger can prevent charging above 80% or cause sessions to stop repeatedly.
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View P0AA6 across all makes →Frequently Asked Questions
What does P0AA6 mean on GMC?▼
P0AA6 stands for "Hybrid Battery Voltage System Isolation Fault." P0AA6 is a hybrid/EV code meaning the battery management system detected an isolation (insulation) fault between the high-voltage battery system and the vehicle's chassis ground. For safety, the high-voltage system is normally electrically isolated from the metal body; this code sets when the measured insulation resistance drops too low, suggesting current could leak to the chassis. This is treated as a serious safety concern and often disables hybrid/EV operation or limits propulsion. The vehicle should be inspected by a qualified hybrid technician, as high-voltage components can pose a shock hazard. On GMC specifically, this code is documented across 1 model.
What causes P0AA6 on GMC vehicles?▼
Common causes on GMC: Moisture or coolant intrusion inside the high-voltage battery pack, Damaged or chafed insulation on high-voltage cables, Corrosion or water in high-voltage connectors, Failed or leaking battery cell/module, Faulty inverter, converter, or A/C compressor (high-voltage components). Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0AA6 on a GMC?▼
Repair costs vary widely depending on the root cause and specific GMC model.
Which GMC models have P0AA6 documented?▼
Au7o has documented P0AA6 on 1 GMC model: Hummer EV SUV.