P0AA6 on Jeep: How to Diagnose & Fix
Hybrid Battery Voltage System Isolation Fault
1 Jeep model · 2 documented issues · 2 critical
P0AA6 on Jeep by model: symptoms, diagnosis and fix
Wrangler 4xe owners report repeated dead 12V auxiliary batteries and, in some cases, complete electrical shutdowns. Several owners found the included Level 1 charger drains the 12V battery after the high-voltage pack reaches 100%, leaving the vehicle unresponsive within days. Beyond no-starts, some 4xe vehicles abruptly lose power or shut off while driving (often when EV range is exhausted), and owners have had to disconnect and reconnect the 12V battery to revive the vehicle, sometimes with persistent warning lights afterward. Dealers frequently cannot locate the parasitic drain even when the 12V battery tests good.
Common Symptoms
- Dead 12V battery / no-start
- Complete electrical shutdown
- Vehicle loses power or stalls while driving
- Battery drains after reaching full charge
- Requires disconnecting/reconnecting 12V to restart
- Persistent warning lights after restart
How to Fix
Apply all available 4xe software/PCU updates (some shutdown reports trace to OTA update regressions, and updates have also addressed charging-state drain). Test the 12V auxiliary battery and charging system; replace a weak 12V battery and verify proper terminal connections. As an interim measure many owners unplug the Level 1 charger once the pack reaches 100% to stop the drain. For drive-cycle shutdowns/loss of propulsion, have the dealer pull stored faults and check for related recalls/customer-satisfaction campaigns, as some 4xe loss-of-power conditions overlap with open safety actions.
Sources for this issue (2)
Chrysler recalled 320,068 vehicles — including all 2020-2025 Wrangler 4xe — because the high-voltage traction battery can fail internally and start a fire whether the vehicle is parked or being driven. This is a separate campaign from the 4xe engine sand-casting-contamination recall; here the defect is inside the HV pack itself. Owners were told to park outside away from structures and to stop charging entirely until remedied, and for months after the December 17, 2025 notification letters no final remedy existed. NHTSA complaints from 2025 Wrangler 4xe owners document the practical consequences: vehicles that cannot be garaged or charged, dealers refusing to open STAR cases, and at least one 2025 Wrangler that caught fire at the passenger front wheel area after a sudden loss of power on the interstate with a family aboard.
Common Symptoms
- Vehicle fire originating at the high-voltage battery while parked or driving
- Recall notice instructing owner to park outside and stop charging
- Sudden loss of propulsion preceding smoke or fire
- Hybrid system warnings before a thermal event
How to Fix
Until the recall is completed, follow Stellantis' instructions literally: park outdoors and away from buildings, and do not plug the vehicle in to charge. Have the dealer perform Recall 25V741 (FCA 68C) — high-voltage battery software update with HV battery replacement as necessary, free of charge. Ask the dealer to document the pack's State of Health reading from the diagnostic session; several owners report dealers declining to share it. If the dealer refuses to open a STAR case, escalate through Jeep Wave and file with NHTSA.
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 Jeep?
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 Jeep it is documented across 1 model: Wrangler.
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 Jeep?
Repair costs vary widely with the root cause and Jeep model; each issue on this page carries its own estimate where one is published.
Looking for P0AA6 on a different make?
View P0AA6 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.