P0DAA on 2014 Cadillac ELR — Battery Charging System Isolation Fault
1 vehicles · 1 makes
How to diagnose and fix P0DAA: most-reported vehicles
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Cadillac ELR · 2014–2014
GM PIC5920B documents a 2014 ELR no-charge path with DTC P0DAA involving high-voltage isolation and possible heater, contactor, coolant-fill or internal isolation conditions. It does not support presuming a failed coolant-level sensor or simply topping off coolant and clearing the code.
Common Symptoms
- Service High Voltage Charging System message
- Vehicle will not charge
How to Fix
Do not touch orange high-voltage components. Have an EV-qualified Cadillac technician preserve DTC and freeze-frame data and follow the GM isolation and coolant-system diagnostic path, including TAC involvement where directed. Incorrect high-voltage work can cause serious injury or death.
Sources for this issue (1)
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P0DAA 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 P0DAA mean?
P0DAA stands for "Battery Charging System Isolation Fault." A hybrid/EV high-voltage code set when the battery management system loses electrical isolation between the high-voltage system and the vehicle chassis ground. GM documents it on the Chevrolet Volt (2011-2014), Cadillac ELR, Opel Ampera and Holden Volt, where it appears with a no-charge complaint and often alongside P0AA6, P1F0E or P1FFF; GM's own wording for the module-side fault is 'high voltage system isolation lost.' The vehicle will typically refuse to charge and may show a service high-voltage system message. Loss of isolation is a genuine shock hazard and should only be diagnosed by a technician with high-voltage training.
What are the most common causes of P0DAA?
The most common causes of P0DAA are: Coolant leak inside or external to the high-voltage battery pack, Loss of isolation within the battery cells or battery sections themselves, Moisture or water intrusion at the charge port receptacle or its housing, Chafed or damaged high-voltage cable insulation, Corrosion or conductive debris across high-voltage terminals, Failed on-board charger module, Faulty battery management / hybrid powertrain control module. The specific cause varies by vehicle.
How much does it cost to fix P0DAA?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by P0DAA?
Au7o has documented P0DAA across 1 vehicle models from 1 manufacturers: Cadillac.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.