MyTeslaMate
HVBATT family

HVBATT_a279_AcjbCpNeutralRelayMayBeWelded

Not Available

What does the HVBATT_a279_AcjbCpNeutralRelayMayBeWelded alert mean?

The battery management system (BMS) has detected that the AC Junction Box (ACJB) Charge Port (CP) neutral relay may be welded.

What you'll see in your Tesla

  • Not Available

What triggers it

The ACJB charge port neutral relay may be welded

When it clears

The BMS no longer qualifies the relay as welded.

Potential impact

Outlets unavailable. DC charging unavailable.

Affected models

Cybertruck

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Alerts like this reach MyTeslaMate through your car's Tesla telemetry API. MyTeslaMate logs every alert your Tesla reports and turns it into readable history and real-time notifications — hosted TeslaMate with no server to run.