Service function guideEV Charging Fault Diagnosis

This guide delivers a complete, professional procedure for diagnosing why an electric vehicle (EV) refuses to charge, covering the onboard charger, charge port, high-voltage battery management, and communication networks. It is written for working mechanics and technically confident owners who already understand high-voltage safety and have access to scan tools and service information. You will learn how to prepare the vehicle safely, perform a logical step-by-step fault-finding routine from the charge port to the battery, interpret measured values and diagnostic trouble codes (DTCs), and verify a successful repair. The guide also explains how the procedure changes across different EV architectures and what aftercare steps prevent a repeat failure.