B0127

Code

Generic B — Body

DC/AC Converter A High Voltage Power Outlet “A” Circuit/Open

Brand: Generic

Type: B — Body

Views: UK: 29 EN: 34 RU: 25

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Blown fuse or open fusible link in inverter/outlet supply
Faulty relay or power switch for the inverter/outlet circuit
Damaged, disconnected, or corroded wiring or connector between inverter and outlet
Failed DC/AC converter (inverter) or failed power outlet assembly
Poor or open ground connection
Water intrusion or physical damage at outlet or wiring

Read and record freeze frame and all stored codes with a scan tool; note any related codes
Visually inspect outlet, inverter/inverter module, connectors and wiring for corrosion, water damage, burns, or mechanical damage
Check relevant fuses and relays for continuity and proper operation
Inspect and verify ground connections at inverter/outlet and chassis ground points
With the outlet commanded ON, measure supply voltage to inverter and to the outlet socket (use appropriate meter and safety precautions)
Perform a wiggle test of wiring while observing voltage/continuity to reproduce intermittent faults

Supply (battery) input to inverter: ~12–14 V DC (vehicle-dependent) present at fuse/input with ignition/accessory and outlet feed ON
Enable/control signal to inverter: 0/12 V logic or CAN enable message depending on design; verify presence when outlet is commanded
Outlet AC output (when inverter enabled): expected AC voltage per vehicle spec (commonly ~110–130 VAC) — only measure AC output when safe and according to service manual
Continuity from outlet socket positive terminal to inverter output terminal: low resistance (near 0 Ω) when wiring intact
Resistance to chassis ground from inverter and outlet ground terminal: near 0 Ω (good ground)
Open-circuit detection: infinite or very high resistance on supply or control circuit when fault present

Connect a scan tool, read and record B0127 and any related codes; clear codes and attempt to re-create the fault to confirm persistence.
Visually inspect the outlet, inverter module, connectors and harness for damage, corrosion, or water ingress. Repair as required.
Check fuses and relays in the inverter/outlet power circuit. Replace any blown fuses and test relays for proper operation.
With the outlet commanded ON (vehicle in the correct mode), measure supply voltage at the inverter input fuse terminal and at the outlet feed pin. If supply is absent, trace back to fuse/relay and battery.
Verify the inverter enable/control signal is present when the outlet is commanded. This may be a switched 12 V feed, a ground-switched signal, or a CAN message — consult wiring diagram and measure accordingly.
Check continuity between the outlet socket terminals and the inverter output terminals. Repair or replace any open or high-resistance wiring/connectors.
Inspect and test ground connections for low resistance to chassis ground; clean/tighten or repair as needed.
If wiring, fuses, relays and control signals are good but no AC output is present, bench-test or replace the DC/AC converter (inverter) or the outlet assembly per service procedures.
After repairs, clear codes and verify operation; perform road or load test if required to confirm the fault is resolved.

Blown fuse or tripped/failed relay supplying the inverter/outlet
Open or damaged wiring connector between inverter and outlet (pin corrosion, broken conductor)
Failed outlet socket or internal inverter failure
Open/poor ground at inverter or outlet