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Home / DTC / P0E46 — Hybrid/EV Battery Pack Voltage Sense E Circuit Low

P0E46 — Hybrid/EV Battery Pack Voltage Sense E Circuit Low

Detailed page for trouble code P0E46.

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22,461specific
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P0E46

Generic P — Powertrain

Hybrid/EV Battery Pack Voltage Sense E Circuit Low

Brand: Generic
Type: P — Powertrain
Views: UK: 19 EN: 19 RU: 13
AI status
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Page language: EN

Causes

  • Open or high-resistance wiring in the voltage sense E circuit
  • Corroded, loose or damaged connector at the BMS or module
  • Failed resistor divider or voltage sensing component
  • Ground short or short to low potential on the sense line
  • Intermittent connection due to harness damage
  • Faulty battery management system (BMS) or powertrain control module (PCM)

Symptoms

  • Hybrid/EV system warning or CHECK HYBRID/EV light illuminated
  • Reduced power or limp mode of hybrid/EV system
  • Inability to start in EV mode or loss of regenerative braking
  • Charging inhibited or charging fault
  • Stored related HV battery or BMS communication codes

What to check

  • Read freeze frame and all related codes; check for other battery-sense circuit codes
  • Retrieve live data for pack voltage, sense E voltage, and BMS-reported pack voltage
  • Visually inspect battery pack harness and connectors for corrosion, damage or moisture
  • Check for physical damage to the resistor divider or sensing module area
  • Verify continuity and resistance of the sense line with power off and HV system made safe
  • Confirm proper CAN/BMS communication and that other modules report consistent pack voltage

Signal parameters

  • Battery pack actual voltage: (example) 200–800 V depending on vehicle platform (check OEM spec)
  • Sense E line expected voltage: scaled 0–5 V (typical); operational range often ~0.5–4.5 V depending on pack voltage
  • Low-fault threshold: sense line voltage significantly lower than expected for measured pack voltage (e.g.,
  • Open circuit: very high resistance on sense line or no measurable voltage
  • Short to ground: sense line near 0 V; short to Vref: near reference/high rail (varies by design)

Diagnostic algorithm

  1. Safety first: follow manufacturer high-voltage safety procedures and isolate HV system before performing physical work.
  2. Scan tool: record P0E46 and any related codes; view freeze frame and live data for pack voltage and sense E voltage while system is in the appropriate state (ignition/ready as required).
  3. Compare sensed voltage to BMS-reported pack voltage. If pack voltage is normal but sense E is low, suspect the sense circuit or wiring.
  4. Visually inspect connectors and harness for corrosion, damage, or loose pins at the BMS, junction blocks and chassis grounds; repair as needed.
  5. With HV isolated and system safe, measure continuity and resistance of the sense E wire back to the BMS. Look for opens, high resistance, or intermittent connections.
  6. With proper precautions and following OEM procedures, measure the sense E voltage at the BMS connector with the system powered to confirm whether the module receives a valid scaled voltage.
  7. If wiring and connectors test OK, inspect or test the resistor divider / sensing circuitry on the battery pack end or BMS input. Replace or repair faulty components.
  8. Re-check for related CAN/BMS communication faults; if sense line and external components are good, consider BMS/PCM internal fault and consult OEM diagnostic flow for module replacement or reprogramming.
  9. Clear codes and perform a drive/ready cycle to confirm the fault does not return and verify normal operation.

Likely causes

  • Loose or corroded connector at the battery pack sense harness
  • Damaged wiring harness (abrasion, pinched, rodent damage)
  • Failed voltage divider or sensor input on the BMS
  • Open circuit in sense line (high resistance)
  • BMS/PCM internal sensor/input fault

Fault status

⚠️ Status
Battery pack voltage sense E circuit low — control module detects the sense input voltage is below the expected scaled value for the measured pack voltage. Stored when the sensing circuit reports a persistent low condition.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

P0E45 P0E47 P0E40 P0E44 P0E48
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