Body, generic

B0127 DC/AC Converter A High Voltage Power Outlet "A" Circuit/Open

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

B0127 reports an open circuit to power outlet A of DC/AC converter A, one of the household-voltage sockets the converter supplies. Ford's patent US11043801B2, behind Pro Power Onboard, gives every socket its own conductor, on/off switch and ground-fault interrupter, fed by an inverter that draws on the traction battery, the motor-generator or both; sensors ahead of and behind each switch let the controller check the path. GM's program N222385490 shows how directly the outlets hang on the converter: 2023 Silverado and Sierra 1500 built without a working inverter had dead dash and bed outlets until it was retrofitted. The makers keep the position of socket A to themselves; B0127 appears in no public document. Outlet A stays dead; driving is unaffected.

Likely causes

Wire or terminal in the feed to outlet A broken or pushed out
Socket insert or its built-in protection defective
Output switch or relay for outlet A inside the converter faulty

Symptoms

  • Outlet A supplies no power while other outlets may still work
  • Message that onboard power or the outlet is unavailable
  • Outlet circuits carry 120/240 V AC from a high-voltage source; work only with the system de-energised

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€60–800
Time0.5–3 h

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

Parts involved

dc ac converter ahv outlet a

Related codes

B0128B0129B012AB012BB012CP2DA8

References: patents.google.com, static.nhtsa.gov.