P0DAA code meaning
Battery Charging System Isolation Fault
Powertrain system Generic code P0Dxx codes Check engine light
What P0DAA means
P0DAA reports that the resistance between the charging-side HV bus and chassis ground has fallen too low, so the charging path or the battery is no longer safely insulated. GM documents the logic for the 2014 Chevrolet Volt and Cadillac ELR in the HPC2 (VICM): in charge-only mode the active isolation resistance is measured, at most once per wake-up; below 325 kOhm, or 400 kOhm while the code is active, for 10 s, and with five of the last ten results low, the code sets as Type A with MIL after one trip. GM preliminary information PIC5920 links it to vehicles that will not charge and points to coolant leaking into the battery pack or insulation loss in the cells; technicians check the pack drain plug and reprogram HPCM2 and BECM, and call support if isolation stays under 275 kOhm. GM used P0AA6 for this on 2011–13 Volts.
P0DAA at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor0.6 to 10 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0DAA
- Vehicle will not charge
- MIL on (GM Type A)
- Low coolant level in the battery coolant reservoir
Common causes of P0DAA
- Most likelyCoolant leaking into the battery pack (GM)
- PossibleInsulation loss within battery cells or sections (GM)
- PossibleOutdated HPCM2/BECM calibration (GM, 2011–2014)
- Less likelyDamaged insulation in the on-board charger or charging cables
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
On board chargerIsolation monitorHv battery pack
What each part of P0DAA means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| AA | The exact fault in that area. |
What to do next
- Note P0DAA and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0DAA
What does P0DAA mean?
P0DAA means "Battery Charging System Isolation Fault". P0DAA reports that the resistance between the charging-side HV bus and chassis ground has fallen too low, so the charging path or the battery is no longer safely insulated. It is a generic code, so it means the same on every make.
Is it safe to drive with P0DAA?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P0DAA fail an emissions test?
P0DAA is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P0DAA to fix?
Difficulty: workshop only. A typical repair takes 0.6 to 10 hours of work. This is a job for a workshop.
Will P0DAA clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.