P2DD4Control Pilot Charging Switch B Stuck On
- Generic OBD-II code · Powertrain
- How the car detects it
- P2DD4 describes the reverse case: switch B remains closed against the module's command to open, and the pilot goes on asking for energy at about 6 V although charging should have ended or paused. Welded or sticking contacts, a driver stage shorted on, or software that does not release the switch are all possible. For switch A, Mercedes-Benz traced the corresponding code P0CFE to the AC charger software and cured it by SCN coding, advising against swapping parts, so an update check comes first. No manufacturer documents P2DD4 publicly. CARB requires plug-in hybrids to monitor the on-board charger. Counterpart: P2DD3; circuit faults: P2DCE to P2DD1. Scheduled charging pauses may be ignored, or the session may end with an error message instead of finishing normally.
- What you may notice
- Charging does not end or pause as planned
- Charging error message after the session
- Likely causes
- PossibleCharger software not releasing the switch
- PossibleWelded or sticking switch contacts
- RareDriver stage permanently switched on
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €50 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.