P0620 OBD2 Diagnostic Code in 2017 Hyundai Accent: Causes and Solutions
My 2017 Hyundai Accent is experiencing a noticeable vibration and rough idle, with an inconsistent and high idle speed. A diagnostic scan revealed the P062-0 error code. It's worth noting that the alternator was recently replaced with a used unit. Given this, I'm seeking advice on how to properly diagnose the root cause of these symptoms.
Begin by reviewing the official OBD2 code explanation at https://www.obd-codes.com/p0620. Since the vibration and rough idle began after replacing the alternator with a used unit, it's possible that the new alternator is faulty. To verify this, remove the serpentine belt and manually spin each pulley to check for smoothness and noise. Any irregularity or grinding sound may indicate a defective component.