Improper Facility Grounding where the Wall Connector is Installed causes Tesla Alert CC_a001

Electrical Installation Grounding

No ground connection detected in the Wall Connector.

The most likely cause is that the electrical circuit supplying the Wall Connector lacks a valid, high-integrity connection to the building's grounding system. To confirm this, a qualified electrician must use a multimeter to measure voltage potential between L1 and Ground, and L2/N and Ground at the terminal block. A significant deviation or lack of continuity between the ground wire and the true earth reference indicates the facility grounding system is insufficient or non-existent.