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DTC codes / P0Exx · Hybrid propulsion / P0E93

P0E93Drive Motor A Inverter Voltage Sensor B Circuit Intermittent/Erratic

P0E93 indicates that the inverter for drive motor A has reported an intermittent or erratic signal from voltage sensor B, which monitors a specific voltage point inside the inverter. The computer sets this code when the sensor signal drops out, jumps, or becomes inconsistent beyond a calibrated threshold, often due to a poor connection or failing sensor rather than a complete failure.

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

Symptoms you may notice

  • Illumination of the check engine light or service vehicle soon message, often with no other symptoms.
  • Intermittent loss of power or hesitation during acceleration, especially under load.
  • The vehicle may enter a reduced power or limp mode if the fault triggers repeatedly.
  • Unusual electrical noises or warning chimes from the hybrid system.
  • In some cases, the vehicle may fail to start or shift into gear if the inverter fault is severe.

Common causes, most likely first

  1. Loose, corroded, or damaged wiring and connectors at the inverter voltage sensor B circuit.
  2. Failing voltage sensor B inside the drive motor A inverter.
  3. Intermittent short or open in the sensor signal circuit due to chafed wires or heat damage.
  4. Poor ground connection for the inverter or sensor reference circuit.
  5. Internal fault in the inverter assembly affecting sensor readings.
  6. Software glitch or outdated calibration in the inverter control module.

How to diagnose and fix it

  1. Inspect and clean the sensor B connector and terminals for corrosion or looseness.
  2. Perform a wiggle test on the sensor wiring harness while monitoring live data to identify intermittent faults.
  3. Check the sensor reference voltage and ground circuits with a multimeter for drops or spikes.
  4. Compare sensor B readings with other voltage sensors in the inverter to verify consistency.
  5. If wiring is good, replace the voltage sensor B if it is serviceable separately.
  6. If the sensor is integrated into the inverter, replace the inverter assembly after confirming all external circuits are sound.
  7. Reprogram or update the inverter control module software if a known calibration issue exists.

Intermittent faults hide in connectors and grounds

  • A common oversight is replacing the entire inverter when the root cause is a loose pin tension in the sensor connector, which only acts up under vibration or temperature changes.
  • The code can be set by a momentary voltage spike from a failing DC-DC converter or auxiliary battery, so checking the 12-volt system is worthwhile before condemning the inverter.
  • Technicians often miss that the sensor B circuit shares a ground with other sensors, and a corroded ground point can cause erratic readings that mimic a failed sensor.
  • In some vehicles, this code appears after jump-starting or battery replacement due to voltage transients, and it may clear after a few drive cycles if no hard fault exists.
  • Always check for technical service bulletins (TSBs) related to inverter software updates, as a reflash can resolve intermittent sensor codes without parts replacement.

Can I keep driving with P0E93?

If the vehicle drives normally and the light is steady, you can continue driving but should schedule a diagnostic inspection soon. Avoid heavy acceleration or long trips until the fault is resolved, as an intermittent inverter fault could escalate to a sudden loss of power.

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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