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2017 LEXUS NX 300H
2.5L I4 Hybrid•AWD•CVT•hybrid
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Repairs0Labor479Torque2115Fluid9DTC1925Battery1Maintenance0Recalls0
P3473moderate severityPowertrain

EV/Hybrid Battery Preconditioning System Fault

on 2017 Lexus NX 300h 2.5L I4 Hybrid · AWD

What this code means

The battery preconditioning system that heats or cools the battery before charging or driving has a fault.

Symptoms

  • Battery not preconditioned for fast charging
  • Reduced fast charge speed in cold weather
  • Battery not warmed before departure
  • Higher energy consumption in cold
  • Range reduced in extreme temperatures

Common causes

  • Preconditioning control module fault
  • PTC heater element failure
  • Heat pump refrigerant circuit leak
  • Preconditioning pump failure
  • Timer or scheduled charge communication error

Diagnostic steps

  1. Test preconditioning activation via scan tool
  2. Monitor battery temperature during preconditioning
  3. Check PTC heater circuit
  4. Test preconditioning coolant pump
  5. Verify scheduled charge and precondition settings

Repair notes

Replace failed PTC heater, pump, or control module. Ensure scheduled charging settings are configured to enable preconditioning.

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