P0AA6 on RAM: How to Diagnose & Fix
Hybrid Battery Voltage System Isolation Fault
1 RAM model · 1 documented issue · $800-$2,000 repair
P0AA6 on RAM by model: symptoms, diagnosis and fix
The 2019+ RAM 1500 with eTorque mild hybrid system (standard on V6, optional on V8) experiences failures of the 48-volt battery pack, belt-driven motor generator (BDM), and eTorque control module. Symptoms include rough idle, stalling at stops, auto start-stop not working, and "Service eTorque System" warning messages. The 48V lithium-ion battery pack located under the rear seat deteriorates over time, especially in hot climates. TSB 08-074-20 REV.A addresses eTorque motor generator unit noise and vibration. Replacement of the 48V battery pack costs $800-1,500 and the BDM unit runs $1,200-2,000.
Common Symptoms
- Service eTorque System warning message
- Auto start-stop system not functioning
- Rough idle or stalling at stops
- Vibration or shudder during restart
- Check engine light with P0AA6 or U1466 codes
- Reduced fuel economy
- Clicking or grinding noise from belt-driven motor
How to Fix
Diagnose with a Mopar wiTECH scan tool to identify if the 48V battery, BDM, or control module is at fault. Check TSB 08-074-20 REV.A for motor generator noise. If the 48V battery is degraded (below 42V resting), replace the battery pack under the rear seat ($800-1,500). If the BDM is failed, replace the unit and serpentine belt ($1,200-2,000). Software reflash may resolve intermittent issues. The eTorque system is covered under the powertrain warranty (5yr/60k miles).
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 RAM?
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 RAM it is documented across 1 model: 1500.
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 RAM?
Published repair estimates on RAM range from $800 to $2,000 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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.