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DTC codes / P0Exx · Hybrid propulsion / P0E0F

P0E0FGenerator Inverter Power Supply A Circuit/Open

P0E0F indicates that the generator inverter control module has detected an open circuit in the power supply circuit for phase A of the inverter, meaning the expected voltage is missing on that supply line. The inverter converts direct current (DC) from the high-voltage battery into alternating current (AC) for the generator, and an open supply prevents it from energizing that phase.

SystemPowertrain
Code typeGeneric (all makes)
SeverityHigh
Fix difficultyProfessional
AreaHybrid propulsion

Symptoms you may notice

  • Illumination of the check engine light or hybrid system warning lamp, often with no other noticeable symptoms
  • Reduced or absent generator output, leading to a no-charge condition and possible 12-volt battery depletion
  • Hybrid system may enter a fail-safe mode, limiting vehicle speed or disabling the generator function
  • Rough running or stalling if the inverter cannot supply the generator field
  • Audible whine or hum from the inverter area may be absent due to loss of phase
  • In some cases, the vehicle may not start or may stall shortly after starting

Common causes, most likely first

  1. Open or damaged wire in the inverter power supply circuit A, including broken conductors or corroded terminals
  2. Blown high-voltage fuse or open fusible link feeding the inverter
  3. Faulty inverter assembly with an internal open circuit on the phase A supply
  4. Poor connection at the inverter connector, such as loose pins or water intrusion
  5. Failed generator control module (GCM) or hybrid control unit not supplying the correct signal
  6. Damaged wiring harness due to rodent damage, chafing, or heat exposure

How to diagnose and fix it

  1. Perform a visual inspection of the inverter wiring harness and connectors for obvious damage, corrosion, or loose pins
  2. Check all fuses and fusible links related to the inverter power supply, including high-voltage fuses, and replace as needed
  3. Use a digital multimeter to measure resistance and continuity on the phase A supply circuit from the inverter connector to the power source, looking for an open
  4. Backprobe the inverter connector to check for reference voltage or signal from the control module, following manufacturer-specific procedures
  5. Inspect the generator control module and hybrid control unit for stored codes and live data parameters related to inverter supply
  6. If the circuit tests good, substitute a known-good inverter or perform a wiggle test on the harness while monitoring live data to isolate intermittent opens
  7. Clear codes and perform a road test to verify the repair, ensuring the inverter supply circuit is functioning under load

Open circuits that mimic inverter failure

  • A common oversight is assuming the inverter itself has failed when the actual problem is a simple open in the wiring harness, often caused by chafing against a bracket or heat damage near the exhaust.
  • The code can be set by a momentary open that occurs only under vibration or temperature extremes, so a static continuity test may pass while the fault is still present during driving.
  • High-voltage systems require special safety precautions; never probe high-voltage circuits with a standard multimeter unless you are trained and equipped for hybrid vehicle service.
  • Some vehicles use a dedicated fuse for each inverter phase, and a blown fuse for phase A may be caused by a shorted generator winding rather than a wiring issue.
  • The generator inverter power supply A circuit may share a ground with other high-voltage components, so a bad ground can set this code even if the positive supply is intact.

Can I keep driving with P0E0F?

Do not continue driving with this code, as the hybrid system may shut down or limit power unexpectedly, and a failed inverter can lead to a no-start condition or further high-voltage damage. Have the vehicle towed to a qualified hybrid service facility for diagnosis.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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