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DTC codes / P0Exx · Hybrid propulsion / P0E92

P0E92Drive Motor A Inverter Voltage Sensor B Circuit High

P0E92 indicates that the inverter for drive motor A has detected an abnormally high voltage on its 'B' sensor circuit, which typically monitors a specific phase or internal bus voltage. The computer sets this code when the signal from that sensor exceeds the expected range for a set time, often pointing to a wiring fault, sensor failure, or inverter internal issue.

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

Symptoms you may notice

  • Illumination of the check engine light or service vehicle soon message, often with no other symptoms
  • Reduced power or limp mode as the hybrid/EV system limits motor output to protect components
  • Inability to start or engage drive if the high voltage system is disabled
  • Intermittent stalling or sudden loss of propulsion while driving
  • Audible warnings or dashboard messages indicating a high voltage system fault

Common causes, most likely first

  1. Faulty voltage sensor B inside the inverter, sending a high signal
  2. Damaged or chafed wiring in the sensor circuit, causing a short to voltage or high resistance
  3. Loose or corroded connector pins at the inverter or sensor harness
  4. Internal inverter fault, such as a failed circuit board or isolation issue
  5. High voltage cable or bus bar problem affecting sensor reference voltage
  6. Software glitch in the inverter control module requiring recalibration or update

How to diagnose and fix it

  1. Perform a visual inspection of the inverter harness and connectors for damage, corrosion, or loose pins
  2. Use a scan tool to check live data for sensor B voltage and compare with expected values
  3. Measure resistance and voltage on the sensor circuit to identify opens, shorts, or high resistance
  4. Check for technical service bulletins or software updates for the inverter control module
  5. If wiring and connectors are good, test the sensor itself and replace if faulty
  6. If the sensor is integrated, replace the inverter assembly as per manufacturer procedures
  7. Clear codes and perform a road test to verify the repair and ensure no pending codes return

Before you replace the inverter assembly

  • A high voltage sensor code often results from a simple chafed wire or loose connector, so always inspect the harness before condemning the inverter.
  • The 'B' sensor may monitor a specific phase or redundant circuit, and its failure can mimic other inverter faults, so use live data to confirm the actual signal.
  • Some vehicles require a software update to correct false high voltage readings from the sensor circuit, so check for bulletins first.
  • High voltage systems can set this code due to a weak 12-volt battery causing erratic module behavior, so verify battery condition and charging system.
  • After repairs, the inverter may need a calibration or learn procedure to reset adaptive values, otherwise the code may reappear.

Can I keep driving with P0E92?

Do not continue driving if the vehicle enters limp mode or shows high voltage warnings, as this can lead to sudden loss of power and potential safety risk. Have the vehicle towed to a qualified technician 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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