P0DAA on Cadillac: How to Diagnose & Fix
Battery Charging System Isolation Fault
1 Cadillac model · 1 documented issue · 1 critical
P0DAA on Cadillac by model: symptoms, diagnosis and fix
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.
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Sources for this issue (1)
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 on a Cadillac?
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. On Cadillac it is documented across 1 model: ELR.
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 on a Cadillac?
Repair costs vary widely with the root cause and Cadillac 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.