P2DB8Battery Charging System B High Voltage Interlock Circuit Performance
- Generic OBD-II code · Powertrain
- How the car detects it
- P2DB8 means the interlock loop of charging system B carries a signal, but one that does not behave as the control unit expects. A common test switches the module's test source on and off and checks that the sensed level follows; a reading that stays put or hovers between the valid bands points to contact resistance, a half-seated plug or corrosion rather than a clean break. No manufacturer documents P2DB8 publicly. GM's Volt summary tables (2011, 2014) judge the A-side charging loop in exactly these two states, sourced and unsourced, against separate limits (P0D17, P0D18). The hard open is P2DB7, fixed low or high levels P2DB9 and P2DBA. While the fault is present, path B is normally not used for charging.
- What you may notice
- Charging via path B refused or interrupted
- Charging system warning message
- Likely causes
- LikelyRaised contact resistance in an interlock terminal
- PossiblePlug in the charging path inserted only partway
- PossibleCorrosion or moisture in an interlock connector
- RareTest source or measuring stage of the module not working correctly
- 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.