What this code means

The permanent magnets in the motor/generator rotor have lost magnetization strength, reducing motor output capability.

Symptoms

• Reduced motor torque output
• Motor efficiency decreased
• Increased current draw for same output
• Motor runs hotter than normal
• Electric range reduced
• Performance degradation gradual

Common causes

• Overtemperature exposure exceeding Curie point
• Excessive current demagnetizing fields
• Manufacturing magnet quality
• Age-related magnetic decay
• Repeated thermal cycling

Diagnostic steps

1. Measure motor back-EMF at known speed
2. Compare motor efficiency to factory specification
3. Check motor temperature history for overtemp events
4. Measure torque output vs current input
5. Review motor duty cycle history

Repair notes

Motor replacement required for demagnetization. No field repair for permanent magnet motors. Investigate and resolve thermal management issue that caused overtemperature.

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