Back to 2012 Toyota Highlander

2012 TOYOTA HIGHLANDER

3.3L V6 HybridAWDAUTOMATIChybrid
2 active safety recalls on this vehicle — view recalls
Repairs0Labor495Torque3678Fluid9DTC906Battery0Maintenance0Recalls2
P3203critical severityPowertrain

Hybrid/EV Battery Pack Internal Resistance High

on 2012 Toyota Highlander 3.3L V6 Hybrid · AWD

What this code means

The internal resistance of the HV battery pack has exceeded acceptable limits. High resistance reduces power capability and increases heat generation.

Symptoms

  • Reduced acceleration
  • Lower electric driving range
  • Battery overheating
  • Reduced charging speed
  • Power limit warning
  • Increased energy consumption

Common causes

  • Battery age-related degradation
  • Frequent fast charging cycles
  • Exposure to extreme temperatures
  • Cell connection corrosion
  • Individual cell resistance increase

Diagnostic steps

  1. Measure pack internal resistance via BMS data
  2. Compare to factory specification
  3. Check individual module resistance values
  4. Inspect HV bus connections for corrosion
  5. Review battery usage and charging history

Repair notes

Battery pack or module replacement based on which modules show elevated resistance. No repair for cell-level degradation.

Other Powertrain codes on this vehicle

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