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DTC codes / P0Exx · Hybrid propulsion / P0E8F

P0E8FDrive Motor A Inverter Voltage Sensor B Circuit

P0E8F indicates that the inverter for drive motor A has detected a fault in the voltage sensor circuit for phase B, which monitors the voltage of one of the three motor phases. The computer compares this sensor's signal with expected values and other phase sensors, and when the signal is out of range or inconsistent, it sets this code and may disable the motor to prevent damage.

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
  • Reduced power or limp mode, often limiting vehicle speed
  • The vehicle may refuse to start or move in electric mode
  • Intermittent loss of drive power while accelerating
  • Often no symptoms besides the warning light, especially if the fault is intermittent

Common causes, most likely first

  1. Faulty voltage sensor B inside the inverter assembly
  2. Damaged or chafed wiring between the sensor and the inverter control module
  3. Corroded or loose electrical connector at the sensor or inverter
  4. Internal failure of the inverter control module affecting sensor readings
  5. High-voltage cable or connector issue causing signal interference
  6. Software glitch in the inverter control module requiring reprogramming

How to diagnose and fix it

  1. Use a scan tool to retrieve all stored codes and freeze-frame data, then clear codes and test-drive to see if P0E8F returns
  2. Visually inspect the inverter wiring harness and connectors for damage, corrosion, or loose pins, and repair as needed
  3. Measure resistance and voltage on the sensor B circuit according to manufacturer specifications to check for opens or shorts
  4. Compare live sensor B data with sensor A and C readings to identify an outlier
  5. If the sensor is faulty, replace the voltage sensor or the entire inverter assembly as required by the manufacturer
  6. Check for technical service bulletins or software updates for the inverter control module and reprogram if available
  7. After repairs, clear codes and verify the fault does not return during a thorough test drive

What Most Miss on P0E8F Diagnostics

  • A loose or corroded connector at the inverter is a frequent cause that is often overlooked because the fault may be intermittent and not set during a quick inspection.
  • The code can be set by a failing 12-volt battery or poor ground connection, which causes voltage irregularities that the inverter misinterprets as a sensor fault.
  • Technicians sometimes replace the inverter unnecessarily when the actual problem is a chafed wire in the harness, so always perform a thorough circuit test before condemning the inverter.
  • P0E8F may appear alongside codes for other phase sensors or motor performance codes, indicating a shared power or ground issue rather than a single sensor failure.
  • After any repair, the inverter may need a calibration or learn procedure to relearn the sensor offsets, which is often missed and leads to repeat codes.

Can I keep driving with P0E8F?

Do not continue driving with this code because it can cause a sudden loss of power or leave the vehicle in limp mode, increasing the risk of a collision. Have the vehicle towed to a qualified repair facility for diagnosis and repair.

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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