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Home / DTC / P0E0F — Generator Inverter Power Supply A Circuit/Open

P0E0F — Generator Inverter Power Supply A Circuit/Open

Detailed page for trouble code P0E0F.

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P0E0F

Generic P — Powertrain

Generator Inverter Power Supply A Circuit/Open

Brand: Generic
Type: P — Powertrain
Views: UK: 17 EN: 33 RU: 23
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Page language: EN

Causes

  • Open circuit in Power Supply A wiring/harness
  • Blown fuse or failed supply relay for inverter/generator
  • Corroded, loose or damaged connector/terminal
  • Faulty generator/inverter power module
  • Poor battery main positive or ground connection
  • Control module internal fault

Symptoms

  • Charge system warning lamp or HV system indicator illuminated
  • Reduced engine or drive power (limp mode) on hybrids/EVs
  • 12V battery not charging or rapid 12V battery drain
  • No inverter/generator output measured at expected terminals
  • Possible additional related DTCs for charging or HV inverter faults

What to check

  • Read and record freeze-frame data and all stored/related DTCs with a capable scan tool
  • Visually inspect fuses, fusible links and supply relays for the inverter/generator
  • Inspect wiring harness and connectors for damage, corrosion, or loose terminals
  • Measure 12V supply voltage at the inverter power supply A input with ignition ON
  • Check continuity/ resistance of the supply circuit back to the battery feed and ground
  • Verify battery state of charge and main battery isolator/relay operation

Signal parameters

  • Signal type: DC power supply (switched battery/ignition feed) to inverter power module
  • Expected voltage at supply terminal with ignition ON: approximately battery voltage (~11–14.5 V for 12V systems) or specified manufacturer HV feed where applicable
  • Open-circuit: no measurable voltage at the inverter supply terminal with fuse/relay confirmed in place
  • Continuity: low resistance path to battery positive (typical wiring continuity
  • Ground reference: chassis/negative battery should be

Diagnostic algorithm

  1. Connect a scan tool, confirm P0E0F and note any related codes or freeze-frame data.
  2. Disable vehicle high-voltage system per manufacturer procedure before any HV work; observe safety protocols.
  3. Visually inspect the inverter/generator power supply A harness, connectors, fuses and relays. Replace any blown fuses or visibly damaged components.
  4. With ignition ON (and HV system made safe), measure DC voltage at the inverter Power Supply A input terminal relative to chassis ground. Compare to battery voltage.
  5. If no supply voltage, check upstream fuse/relay and continuity from the battery positive to the inverter input. Repair open or high-resistance sections.
  6. Check the inverter/generator ground(s) for good contact and low resistance to chassis/battery negative. Clean and tighten ground connections.
  7. If wiring and fuses are good, perform resistance/continuity checks on the internal harness between inverter and control module; consider back-probing connector pins.
  8. If wiring checks pass, suspect internal inverter/generator power module failure. Refer to manufacturer procedures for module functional tests and replacement.
  9. After repairs, clear codes, recharge 12V battery if required, reconnect HV system per procedure, and road test while monitoring for recurrence.
  10. If code returns or diagnosis is unclear, consult manufacturer technical service information for pinouts, wiring diagrams and specific test values.

Likely causes

  • Blown primary fuse or fusible link feeding the inverter power supply A
  • Separation or broken wire between battery/ignition feed and inverter power terminal A
  • Connector pin pushed out, bent, or corroded at the inverter or harness junction
  • Inverter high-voltage power module failure (internal open)
  • Battery pack, 12V battery or main battery isolator/relay not providing feed
  • High-resistance ground or chassis connection causing effective open under load

Fault status

⚠️ Status
Generator Inverter Power Supply A Circuit/Open — the inverter's power feed A is open or not present. Investigate fuses/relays, wiring harness and connectors, battery and inverter power module. May disable inverter operation or charging.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.5-3.0 hours

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