P2DBA code meaning
Battery Charging System B High Voltage Interlock Circuit High
What P2DBA means
P2DBA flags an interlock signal of charging system B that reads too high. A loop fed from a test source and measured at its far end shows a raised level when it is shorted to a supply voltage, or, depending on the circuit, when added resistance or a break lets the measuring input float upward. No manufacturer documents P2DBA publicly. GM checks the A-side loop of the Volt in two states (P0D18): with the 5 V source off, a reading above 24 % of reference counts as a fault, with it on, one above 44 %; both are Type A in the 2011 and 2014 tables. Telling a short to voltage from an open therefore needs both states. The low counterpart is P2DB9. Charging through path B stays blocked.
P2DBA at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2DBA
- No charging via path B
- Charging system warning message
Common causes of P2DBA
- PossibleInterlock wire shorted to a supply voltage
- PossibleAdded resistance or partial break in the interlock loop
- Less likelyFaulty measuring input in the control module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Bcs b hv interlockWiring harnessOn board charger
What each part of P2DBA means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| BA | The exact fault in that area. |
What to do next
- Note P2DBA 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 P2DBA
What does P2DBA mean?
P2DBA means "Battery Charging System B High Voltage Interlock Circuit High". P2DBA flags an interlock signal of charging system B that reads too high. It is a generic code, so it means the same on every make.
Is it safe to drive with P2DBA?
P2DBA does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P2DBA fail an emissions test?
P2DBA 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 P2DBA to fix?
Difficulty: medium. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P2DBA clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.