Electric Motor/Generator Demagnetization Detected
2012-2017 Buick Regal 2.4L I4 Hybrid
Description
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
- Measure motor back-EMF at known speed
- Compare motor efficiency to factory specification
- Check motor temperature history for overtemp events
- Measure torque output vs current input
- 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.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P3227 on Other Vehicles
Common Questions
What does code P3227 mean on a 2012-2017 Buick Regal?
P3227 stands for "Electric Motor/Generator Demagnetization Detected". The permanent magnets in the motor/generator rotor have lost magnetization strength, reducing motor output capability.
What are the symptoms of P3227 on a Buick Regal?
Common symptoms of P3227 include: Reduced motor torque output, Motor efficiency decreased, Increased current draw for same output, Motor runs hotter than normal, Electric range reduced, Performance degradation gradual.
What causes P3227 on a 2012-2017 Buick Regal?
Common causes of P3227 include: Overtemperature exposure exceeding Curie point, Excessive current demagnetizing fields, Manufacturing magnet quality, Age-related magnetic decay, Repeated thermal cycling.