No ERR12 on startup, but ERR12 occurs during driving

• Fault Cause: Controller malfunction or drive motor malfunction

  
  

  Troubleshooting Method: Using a multimeter to measure the drive motor resistance

  
  

  1. The normal resistance should be approximately 0.3-0.8Ω. If the resistance is abnormal, it indicates a malfunction of the drive motor, need replacement.

  
  

  2. Measure the resistance of the drive motor harness at the controller end: 

  The normal resistance should be approximately 0.3-0.8Ω. If the resistance is normal, it indicates controller malfunction, and the controller needs to be replaced.

  
  

  Tools Required: Multimeter