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2011 LEXUS LS 600H
5.0L V8 Hybrid•AWD•AUTOMATIC•hybrid
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Repairs0Labor480Torque2158Fluid8DTC1896Battery1Maintenance0Recalls0
P3226critical severityPowertrain

Motor/Generator Stator Winding Insulation Resistance Low

on 2011 Lexus LS 600h 5.0L V8 Hybrid · AWD

What this code means

The insulation resistance of the motor/generator stator windings has dropped below the safety threshold, indicating potential winding degradation.

Symptoms

  • Motor output may be limited
  • HV isolation warning possible
  • Motor efficiency reduced
  • Unusual motor noise
  • Power output derated

Common causes

  • Moisture intrusion into motor housing
  • Winding insulation aging
  • Overtemperature damage to windings
  • Contamination of windings
  • Manufacturing defect

Diagnostic steps

  1. Measure motor phase-to-ground insulation resistance
  2. Check motor housing for moisture intrusion
  3. Test phase-to-phase resistance balance
  4. Inspect motor cable glands and seals
  5. Review motor overtemperature history

Repair notes

Motor replacement required if insulation resistance is below minimum specification. Repair any moisture intrusion path.

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