Powertrain, generic (extended)

P2DAB DC/AC Converter Control Module A Switch B Circuit Range/Performance

Check engine lightUsually off
EmissionsNot relevant
Drive cycleRequired
Limp modeNo

With P2DAB, switch B of converter module A – the unit feeding the vehicle's AC sockets – fails a plausibility test. Wiring tests pass, yet switch B does not deliver what was asked of it: it stays closed after an off command, opens under load, or reports a position that disagrees with the measured output. CARB 13 CCR 1968.2 calls for such functional checks on output components. In Ford's patent US11043801B2 the controller opens socket switches on its own – after a timer, above a user current limit or when total power is too high – so a state the module did not expect can also come from this logic. No manufacturer documents P2DAB publicly. A switch that welds shut is the more serious case, because the socket can no longer be switched off; contact wear and moisture are the usual reasons.

Likely causes

Contacts of switch B or its relay welded, sticking or worn
Moisture or dirt at the outlet panel of group B
Load management or software in the converter module, update available

Symptoms

  • Outlets of group B switch off unexpectedly or cannot be switched off
  • Warning about onboard power in the display
  • Fault appears mainly with high loads connected

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

P2DAAP2DA9P0364U0589

References: patents.google.com, law.cornell.edu.