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Home / DTC / P0E45 — Hybrid/EV Battery Pack Voltage Sense E Circuit Range/Performance

P0E45 — Hybrid/EV Battery Pack Voltage Sense E Circuit Range/Performance

Detailed page for trouble code P0E45.

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P0E45

Generic P — Powertrain

Hybrid/EV Battery Pack Voltage Sense E Circuit Range/Performance

Brand: Generic
Type: P — Powertrain
Views: UK: 13 EN: 26 RU: 18
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Page language: EN

Causes

  • Open, short or high resistance in the Voltage Sense E wiring or connector
  • Corroded, loose or contaminated connector at the BMS or junction box
  • Failed or out-of-spec voltage divider/sensor in the battery pack or BMS
  • BMS internal fault or software/calibration error
  • Actual pack or module group voltage outside expected range (cell failure, isolation event)
  • Low or lost low-voltage supply or ground to the BMS

Symptoms

  • Battery system warning and/or master warning illuminated
  • Reduced vehicle propulsion or limp-home mode engaged
  • Charging disabled or limited charging capability
  • Incorrect pack voltage or state-of-charge reporting on scan tool
  • Possible unexpected shutdown of HV systems or inability to start in EV mode

What to check

  • Read freeze-frame and stored codes from BMS and vehicle ECUs; note battery pack voltage and vehicle conditions at fault
  • Check for additional related DTCs (other voltage sense channels, isolation faults, communication errors)
  • Visually inspect HV and sense wiring harnesses, connectors, and junction box for damage, corrosion, water ingress, or loose terminals
  • Verify low-voltage supply and ground to the BMS are present and within specification
  • Use manufacturer-recommended diagnostic tool to read pack voltage, individual module/group voltages and compare to reported Voltage Sense E value
  • Confirm connector retention/terminal condition by reseating and inspecting contacts

Signal parameters

  • Battery pack total voltage: typically ranges ~100–800 V depending on vehicle architecture (refer to manufacturer spec)
  • Voltage Sense E signal to controller: commonly a scaled 0–5 V analog input proportional to pack voltage (expected to vary smoothly with pack voltage)
  • Fault condition: sense signal outside expected 0–5 V range, open-circuit (no signal), short to ground or battery, or signal not proportional to measured pack voltage
  • Low-voltage (BMS supply) rails: typically 12 V or vehicle-specific auxiliary supply — required for proper sensing

Diagnostic algorithm

  1. Retrieve DTCs and freeze-frame data from BMS and related controllers; record pack voltage, ambient and pack temperature, and operating state at time of fault.
  2. Check for and address any additional battery/communication/isolation codes first; some faults are secondary.
  3. Visually inspect Voltage Sense E wiring, connectors, and the battery junction box for damage, corrosion or moisture; repair as needed.
  4. With vehicle safely isolated per manufacturer HV procedures, measure actual pack voltage and the Voltage Sense E signal at the BMS harness using approved HV-safe procedures/tools. Confirm the sense voltage scales appropriately with pack voltage.
  5. Check low-voltage supply and ground to the BMS (and reference ground for the sense circuit). Repair poor grounds or supply faults.
  6. Perform wiggle/stress tests on the harness while monitoring the sense signal and DTC status to find intermittent faults.
  7. If wiring and connectors are good but the sense signal remains out-of-range, consider replacing or bench-testing the voltage divider/sensor module or the BMS input module per manufacturer guidance.
  8. After repairs, clear codes and perform road/charger verification cycles and monitor for recurrence. If DTC persists, consult manufacturer technical service information for advanced diagnostics or software updates.

Likely causes

  • Damaged or loose connector at BMS or battery pack junction
  • Open/short in sense circuit wiring or poor crimp/contact
  • Failed BMS voltage sense input circuitry
  • Battery module group imbalance or disconnected sensor harness

Fault status

⚠️ Status
Hybrid/EV Battery Pack Voltage Sense E Circuit Range/Performance — stored when BMS detects sense input outside expected range or performance limits; may be current or intermittent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.5 hours

Similar codes

P0E44 P0E46 P0E47 P0E48 U0100
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