P0DAA on 2014 Cadillac ELR — Battery Charging System Isolation Fault
1 vehicles · 1 makes
Most Reported On
P0DAA is an OBD-II diagnostic trouble code meaning “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. This code is most commonly reported on 2014 Cadillac ELR.
Common Causes
Diagnostic Tools
This is a powertrain code, so a basic OBD-II reader can read it. These read P0DAA.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple code reader for engine (P) codes on many compatible OBD-II vehicles. It does not support every vehicle or hybrid/EV application, and it does NOT read body, chassis or network codes; confirm exact-vehicle compatibility before buying.
- Read & clear engine (P) codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth scanner with a companion app that reads beyond the engine module — ABS, SRS and transmission — plus manufacturer-specific codes on many vehicles.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X V3.0 Elite OBD-II Scanner
by LAUNCH
Handheld scanner covering the four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level tablet with all-system coverage and bi-directional control, so you can command a module rather than only read it.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
What you can do yourself, and what needs a shop
Reading the code, clearing it, and watching whether it returns is a driveway job with the right scanner. These steps are not:
- Module programming or software updates — needs the manufacturer software or a J2534 pass-through with a paid subscription.
- Replacing a control module — most are VIN-programmed and immobilizer-registered, so a new one does nothing until it is coded to your car.
- Airbag/SRS component work — a stored fault can deploy a live device.
If the vehicle is still under warranty, check for an open recall or technical service bulletin before buying anything — the repair may already be covered.
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
FAQ
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.