P2DAADC/AC Converter Control Module A Switch B Circuit
- Generic OBD-II code · Powertrain
- How the car detects it
- P2DAA flags an electrical fault in the line of switch B belonging to DC/AC converter control module A, the vehicle's inverter for 120/230 V sockets. The module finds the switch B line open, shorted to ground or to supply, or without a usable signal. Having a second switch makes sense where outlets are split into groups – in Ford's patent US11043801B2 every socket, or a set of sockets, gets its own ON/OFF switch, driven by the DCACA through relays, and the controller sheds low-priority sockets when total load gets too high. No manufacturer documents P2DAA publicly, and which outlet group B serves is set by the maker. Only the sockets behind switch B should be dead; if group A fails at the same time, a common feed, ground or the module itself is the more likely culprit than two separate switches.
- What you may notice
- AC outlets of group B without power, other outlets work
- Message that onboard power is limited or unavailable
- Likely causes
- LikelyOpen or shorted wire or corroded connector in the switch B circuit
- PossibleSwitch B or its relay failed
- RareShared feed, ground or converter module faulty (when group A also fails)
- Repair
- Medium · 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.