P0AA6 on Chrysler: How to Diagnose & Fix
Hybrid Battery Voltage System Isolation Fault
1 Chrysler model · 1 documented issue · 1 critical
P0AA6 on Chrysler by model: symptoms, diagnosis and fix
The high-voltage battery pack in Pacifica PHEV models can develop internal short circuits and spontaneously catch fire, even while parked and turned off. Stellantis recalled 24,000+ vehicles after 7+ fire incidents. A previous software fix was deemed not effective and a second recall was issued. Recall 72B / NHTSA 24V-482 provides free battery replacement.
Common Symptoms
- Service Hybrid Electric Vehicle System warning
- Battery not charging properly
- Unusual heat from under vehicle
- Burning smell from underneath
- In worst case, fire while parked
How to Fix
Park vehicle outside immediately, away from structures, until recall is completed. Do NOT charge the vehicle until recall remedy is applied. Contact Chrysler at 800-853-1403 for recall status. Recall 72B provides free diagnostic software update and battery replacement if abnormality detected.
Sources for this issue (3)
P0AA6 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0AA6 mean on a Chrysler?
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 Chrysler it is documented across 1 model: Pacifica.
What are the most common causes of P0AA6?
The most common causes of P0AA6 are: 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. The specific cause varies by vehicle.
How much does it cost to fix P0AA6 on a Chrysler?
Repair costs vary widely with the root cause and Chrysler model; each issue on this page carries its own estimate where one is published.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.