VCFRONT_a414_prechargeLVLoadReduction

Low Voltage (LV) bus load reduction activated due to inability to precharge the High Voltage (HV) bus.

Live incidence rate

<0.01% (Extremely rare)

Vehicle messages

None displayed

Impact

The Autopilot Electronic Control Unit (ECU), Media Control Unit (MCU), headlight, and sleep bypass LV power feeds are powered off (eFuses gating these power feeds are opened to reduce LV bus load).

Description

Low Voltage (LV) bus load reduction activated due to inability to precharge the High Voltage (HV) bus.

Cause

The vehicle controller detects HV bus precharge is unsuccessful due to low LV Bus voltage.

Clear condition

HV bus precharge succeeds or LV bus load reduction times out.

Models

Model 3 2017-2023, Model 3 2024+, Model Y, Model Y 2025+

Visibility

service

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