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Home / DTC / P0E94 — Drive Motor B Inverter Voltage Sensor B” Circuit High

P0E94 — Drive Motor B Inverter Voltage Sensor B” Circuit High

Detailed page for trouble code P0E94.

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P0E94

Generic P — Powertrain

Drive Motor B Inverter Voltage Sensor B” Circuit High

Brand: Generic
Type: P — Powertrain
Views: UK: 12 EN: 17 RU: 15
AI status
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Page language: EN

Causes

  • Faulty inverter voltage sensor (sensor B)
  • Open or shorted wiring between inverter and controller (short to battery positive or other high-voltage source)
  • Poor or corroded connector/terminal at sensor or controller
  • Faulty inverter control module or internal sensor circuitry
  • High-voltage supply anomaly (unexpectedly high DC bus voltage or surge)
  • Fault in controller’s reference/ground or ADC input

Symptoms

  • DTC P0E94 stored and possibly MIL illumination
  • Reduced traction or limp-home mode for Drive Motor B
  • Unusual behavior from motor B (reduced torque, forced derating)
  • Possible loss of regeneration from motor B
  • Possible presence of other HV-related DTCs

What to check

  • Read freeze frame and diagnostic data: capture live sensor voltage and related HV bus voltage
  • Check for additional DTCs that may indicate HV supply or ground issues
  • Visually inspect inverter, harness, and connectors for damage, heat discoloration, or corrosion
  • Verify connectors are fully seated and locking tabs intact
  • Measure sensor signal voltage at the sensor connector and at the controller/inverter harness (compare both ends)
  • Measure continuity/resistance of wiring between sensor and controller/inverter with power off and HV system disabled

Signal parameters

  • Sensor output is a scaled representation of the HV DC bus; control modules typically expect a low-voltage signal proportional to HV bus
  • Expected signal typically in low-voltage range (e.g., 0–5 V) depending on vehicle — verify vehicle-specific nominal and threshold values
  • Fault is logged when the sensor signal exceeds the controller's upper threshold (signal-high condition)
  • HV bus actual voltage (pack voltage) should be checked simultaneously — abnormalities in HV bus may correlate with high sensor reading

Diagnostic algorithm

  1. Record codes, freeze frame, and live data. Note sensor B voltage, HV bus voltage, and related parameters.
  2. Attempt a key cycle and clear the code. See if the code returns and under what conditions it sets.
  3. Perform a visual inspection of inverter B, harnesses, and connectors for damage, melting, or contaminants.
  4. Verify safety: disable high-voltage system and follow the manufacturer’s HV safety procedure before touching harnesses or connectors.
  5. With HV disabled, disconnect the sensor/inverter connector and inspect pins for corrosion, bent pins, or contamination.
  6. With appropriate PPE and tools, measure the sensor output voltage at the connector with the system in the commanded state per service manual. Compare to vehicle-specific expected values.
  7. Check continuity and insulation: measure resistance between the sensor signal wire and vehicle positive HV bus and ground to detect shorts.
  8. Verify the controller/inverter reference ground and supply voltages to the sensing circuit.
  9. If wiring and connectors are good, test or replace the inverter voltage sensor or inverter assembly per service procedures. If available, swap with a known-good unit or harness to isolate the fault.
  10. After repairs, clear codes and perform a road/functional test to confirm the fault does not recur. Re-scan for related DTCs and recheck live data.

Likely causes

  • Damaged or pinched harness near inverter (short to HV bus)
  • Corroded connector causing intermittent high reading
  • Failed inverter internal sensing electronics
  • Improperly repaired or modified HV wiring introducing a fault
  • Controller/ECU internal fault or lost reference ground

Fault status

⚠️ Status
Drive Motor B Inverter Voltage Sensor B Circuit High — sensor signal above allowable range; inspect inverter sensing circuit, wiring, and HV supply.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.0-4.0 hours

Similar codes

P0E90 P0E91 P0E92 P0E93 P0E95 P0E96
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