Powertrain, generic (extended)

P2DAA DC/AC Converter Control Module A Switch B Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Open or shorted wire or corroded connector in the switch B circuit
Switch B or its relay failed
Shared feed, ground or converter module faulty (when group A also fails)

Symptoms

  • AC outlets of group B without power, other outlets work
  • Message that onboard power is limited or unavailable

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–1,500
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

dcac converter module a switch bwiring harnessdc ac converter module a

Related codes

P2DABP2DA8P0364U0288

References: patents.google.com, static.nhtsa.gov, law.cornell.edu.