B0129

Code

Generic B — Body

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

Brand: Generic

Type: B — Body

Views: UK: 24 EN: 32 RU: 28

AI status

Completed

ready

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Page language: EN

Causes

Blown fuse or tripped circuit protector for HV outlet C
Open, damaged, or corroded connector or wiring harness between DC/AC converter and outlet
Faulty relay or contactor controlling outlet C
Internal failure in DC/AC converter/inverter output stage
Accessory or outlet device shorted or disconnected
Poor ground or high-resistance return path

Symptoms

High-voltage power outlet C does not produce AC power
Accessory plugged into outlet C is not powered
Associated dash message or indicator for outlet/inverter fault
Possible other inverter/auxiliary power faults stored

What to check

Verify DTC presence and freeze-frame with a scan tool; note ignition state and conditions
Follow vehicle high-voltage safety procedures before any physical inspection
Visually inspect fuses, fusible links and circuit protectors for outlet C
Inspect connectors and wiring between converter and outlet for damage, corrosion, or disconnection
Check for corrosion or burn marks at outlet and connector pins
Measure supply and return continuity between converter connector and outlet (with HV system isolated per OEM procedure)

Signal parameters

Control input: converter enable command present when outlet requested (logic-level or CAN-controlled)
Supply voltage: expected DC input to converter = vehicle HV battery nominal voltage (check against manufacturer spec)
Output voltage: expected AC voltage at outlet C when enabled (typical ~120 VAC or manufacturer-specified value)
Continuity/resistance: low ohms between converter output terminal and outlet terminal when wiring intact
Ground/return: low-resistance path to vehicle ground or negative HV return as specified

Diagnostic algorithm

Safety: Disable high-voltage system and follow manufacturer lockout/tagout and PPE procedures before touching HV components.
Read codes and freeze-frame with a scan tool; record related inverter/DC-AC and body module codes.
Visual inspection: check fuses, circuit protectors, relay/contactor, connectors and harness along the route to outlet C.
Verify fuses/circuit protectors: replace any blown protective device and inspect for cause of failure.
With HV system made safe per OEM instructions, perform continuity/resistance check between converter output pin for outlet C and outlet terminal. Repair any open or high-resistance sections.
Check operation of relay/contact controlling outlet C (apply appropriate control or bench-test per service manual). Replace if contacts are open or intermittent.
Re-enable HV system per manufacturer procedure and measure output voltage at outlet C while commanding the converter to enable the outlet (use appropriate HV-rated measurement tools and PPE).
If wiring, fuses and relays are good but output not present, suspect internal converter output stage failure—verify converter input power and control signals; consult manufacturer service info before replacing module.
Clear codes, perform functional test with a known good load, and re-scan. If code returns, escalate to module-level diagnosis or replacement after confirming wiring and connectors.

Likely causes

Blown fuse or protective device for outlet C
Disconnected or corroded connector at outlet or converter
Broken or pinched wiring in harness to outlet C
Faulty relay/contact controlling the HV outlet
Internal converter output circuit failure

Fault status

⚠️ Status

Open or high-resistance detected on DC/AC Converter A High Voltage Power Outlet "C" circuit — outlet C may be unpowered. Code stored when expected output or continuity not detected.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours