P0AA6 on Honda
Hybrid Battery Voltage System Isolation Fault
P0AA6 on Honda vehicles indicates hybrid battery voltage system isolation fault. Au7o has documented this code across 1 Honda model — most commonly on CR-V. 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 Honda by Model
Honda CR-V(1 issue)
- CR-V e:FCEV Fuel Cell Stack Coolant Leak — Loss of Drive Power (Recall 25V858000)2025
The hydrogen-powered 2025 CR-V e:FCEV (plug-in fuel-cell variant) was recalled because coolant can leak from the fuel cell stack coolant system into the fuel cell stack case, causing an internal short circuit between the bipolar plate and support-bar housing. This can trigger power-system, fuel-cell, and insulating-fluid warnings, drop the vehicle into a low-output mode (about 20 kW / ~27 hp), and ultimately cause a loss of drive power. Root causes were an under-validated reduction in adhesive sealant on the FC stack end joint and a supplier's missing deburring step on an O-ring groove in a coolant wobble joint. NHTSA recall 25V858000 covers 388 vehicles (nearly the entire U.S. fleet); the vehicles also fail FMVSS 305.
Looking for P0AA6 on a different make?
View P0AA6 across all makes →Frequently Asked Questions
What does P0AA6 mean on Honda?▼
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 Honda specifically, this code is documented across 1 model.
What causes P0AA6 on Honda vehicles?▼
Common causes on Honda: 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 Honda?▼
Repair costs vary widely depending on the root cause and specific Honda model.
Which Honda models have P0AA6 documented?▼
Au7o has documented P0AA6 on 1 Honda model: CR-V.