P2DBABattery Charging System B High Voltage Interlock Circuit High
- Generic OBD-II code · Powertrain
- How the car detects it
- 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.
- What you may notice
- No charging via path B
- Charging system warning message
- Likely causes
- PossibleInterlock wire shorted to a supply voltage
- PossibleAdded resistance or partial break in the interlock loop
- RareFaulty measuring input in the control module
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.