P0E95

Code

Generic P — Powertrain

Drive Motor B Inverter Voltage Sensor B” Circuit Intermittent/Erratic

Brand: Generic

Type: P — Powertrain

Views: UK: 19 EN: 33 RU: 28

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Page language: EN

Causes

Damaged or chafed wiring harness to inverter voltage sensor B
Loose, corroded or pushed-out connector/pins at sensor or inverter
Poor or intermittent sensor ground or power supply
Faulty inverter voltage sensor (internal sensor element or signal conditioning)
Internal inverter electronics fault (signal conditioning/ADC failure)
Intermittent short to battery positive or ground

Symptoms

MIL (Check Engine) or EV system warning lamp illuminated
Reduced motor torque or limp/inverter-protect mode
Loss or reduction of regenerative braking
Intermittent or jerky drive/motor response
Freeze frame or live data shows unstable/rapidly changing inverter voltage sensor readings

What to check

Retrieve all stored and pending codes and freeze-frame data with a capable scan tool
Capture live data stream for inverter voltage sensor B while attempting to reproduce condition (drive or commanded motor run)
Visually inspect harness, connectors, and pin condition at Drive Motor B inverter and sensor; look for corrosion, damage, loose pins or water ingress
Perform wiggle test on harness/connectors while monitoring live data to find intermittent changes
Measure sensor signal, reference and ground with multimeter/oscilloscope (see signal_params) while inverter is running (observe all HV safety procedures)
Check power supply and ground/reference continuity to the inverter sensing circuit with vehicle power off and HV system isolated/disabled per manufacturer procedure

Signal parameters

Expected DC-link/high-voltage pack range: typically nominal pack voltage (example: 200–800 V) — depends on vehicle; confirm with manufacturer data
Sensor output to controller: scaled analog voltage typically 0–5.0 V proportional to pack voltage (confirm pinout and scale with wiring diagram)
Normal idle/static sensor output: stable steady voltage proportional to pack voltage; no rapid fluctuation greater than a few tens of millivolts/sec when system is stable
Intermittent/erratic condition: sudden jumps, dropouts, noise, or irregular waveform on the sensor line; open-circuit may show floating or near 0 V; short-to-ground shows near 0 V; short-to-battery shows rail or clipped voltage
Expected wiring resistance (power off): low resistance between sensor reference/ground and known chassis ground per manufacturer spec; open or very high resistance indicates break or poor contact

Diagnostic algorithm

Safety first: follow manufacturer high-voltage isolation and PPE procedures before any HV measurements or connector disassembly
Read all codes and freeze-frame data; note operating conditions when fault set
Use scan tool to monitor inverter voltage sensor B live data while attempting to duplicate fault (key on, ready state, and during driving or motor command)
Perform a visual inspection of the inverter B area: connectors, harness routing, signs of rubbing, heat damage, corrosion, or moisture
Wiggle test harness/connectors while watching live data to identify intermittent wiring/connector faults
With vehicle safe and HV disabled, disconnect connector and inspect pins for corrosion, damage, pushed-out terminals or water — repair or replace as needed
Check continuity and resistance of sensor supply, signal, and ground/reference circuits back to the inverter/controller and to chassis ground; repair any open/shorts
Re-enable system and measure sensor output voltage at the controller/inverter connector while inverter is operating (use oscilloscope if available) to confirm stable signal scaled to pack voltage
If wiring and connectors are good but signal remains erratic, suspect internal inverter voltage sensing circuitry or sensor module — consult manufacturer procedures for inverter module bench tests or replacement
After repairs, clear codes and perform a full drive cycle and re-check live data to verify fault does not return
If issue persists, consult service bulletins and consider replacement of inverter module or ECU only after eliminating wiring and connector causes