P2DBBBattery Charging System B High Voltage Interlock Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- How the car detects it
- P2DBB covers an interlock loop of charging system B that keeps dropping out and recovering, so its state flips between valid and invalid. The trigger is usually mechanical: a terminal with low contact pressure, a plug that is not fully latched, or a wire that only loses contact when the body flexes or the parts heat up. No manufacturer documents P2DBB publicly. A useful parallel is Mercedes bulletin LI54.10-P-067823 for the smart electric drive with the 22 kW charger option: loose low-voltage contacts at the charger produced sporadic interlock faults, filed there under the general codes P0A0A and P0A0E, and the car would not charge. CARB expects plug-in hybrids to catch faults that block charging. Steady faults are P2DB7 to P2DBA. Charging may stop for no visible reason.
- What you may notice
- Charging via path B stops without warning
- Fault comes and goes, often depending on temperature
- Likely causes
- LikelyLoose or widened terminal in an interlock connector
- PossibleConnector in the charging path not fully latched
- PossibleChafed interlock wire that loses contact only with movement or heat
- 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.