VCFRONT1_a127 — iBooster eFuse Trip

Full alert identifier: VCFRONT1_a127_iBoosterEFuseTrip

Alert description

The front vehicle controller (VCFRONT) has opened the Low Voltage (LV) power feed circuit (eFuse) to the electromechanical brake booster (iBooster / IBST) controller, interrupting power supply to the iBooster (IBST).

Potential impact

Brake assist functionality may be limited.

Set condition

VCFRONT detects the eFuse circuit gating LV power feed to iBooster as open (tripped).

Clear condition

VCFRONT no longer detects the eFuse circuit gating LV power feed to iBooster as open (tripped) after a retry or sleep cycle, or the vehicle enters a state where the eFuse is expected to be open (off).

Signals to check

Open this alert in Service Mode Plus and review the Payload tab. Use the field names below to identify the values shown by your vehicle.

Signal	Unit
I Booster E Fuse Current `VCFRONT1_a127_iBoosterEFuseCurrent`	A
I Booster E Fuse Temp `VCFRONT1_a127_iBoosterEFuseTemp`	degC
I Booster E Fuse Voltage `VCFRONT1_a127_iBoosterEFuseVoltage`	V

Check other alerts

With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of VCFRONT1_a127.