EFUSE_w128
EFUSE_w128_dcdcEFuseTrip
What does EFUSE_w128 mean?
Tesla warning code in the Electronic Fuse (EFUSE) module. This alert will trigger when the DCDC E-fuse output (input into the 12V system) is faulted as seen by the E-fuse electronic control unit (ECU). This can occur if an unexpectedly high inrush current into the DCDC module or a short circuit event has occurred at the output of the E-fuse. Once the E-fuse is tripped (turned off), the Electronic Stability Program (ESP) Motor will measure ~0V when it is loaded or ~2V when there is an open circuit for the -D and -E Top Level Assemblies (TLAs). For -F and beyond TLAs, the open circuit voltage is 9.8V. ?
Original Description
This alert will trigger when the DCDC E-fuse output (input into the 12V system) is faulted as seen by the E-fuse electronic control unit (ECU). This can occur if an unexpectedly high inrush current into the DCDC module or a short circuit event has occurred at the output of the E-fuse. Once the E-fuse is tripped (turned off), the Electronic Stability Program (ESP) Motor will measure ~0V when it is loaded or ~2V when there is an open circuit for the -D and -E Top Level Assemblies (TLAs). For -F and beyond TLAs, the open circuit voltage is 9.8V. ?
Severity Notes
EFUSE_w128 is a Warning in the Electronic Fuse system. Schedule service soon. Monitor your vehicle for additional warnings.
Other EFUSE Codes
View all EFUSE codes →Tesla alert codes sourced from the community-maintained Tesla Alerts Dictionary. This information is for educational purposes only. Always consult Tesla Service for official diagnosis and repairs.