EFUSE-W128
EFUSE_w128_dcdcEFuseTrip
Also written as EFUSE_W128 / EFUSE W128 / EFUSE_w128_dcdcEFuseTrip / efuse_w128_dcdcefusetrip
Why does the exact Tesla alert ID matter?
Record the exact alert ID, including underscores, suffixes, and companion alerts. Tesla alerts that look similar can point to different modules, timestamps, and service procedures.
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. ?
Affected Tesla Models
What You May Notice
- Electronic Fuse alert: This alert will trigger when the DCDC E-fuse output (input into the 12V system) is faulted as seen by the E-fuse electro
- Related vehicle feature may be reduced or unavailable
- Alert visible in the Tesla app: This alert will trigger when the DCDC E-fuse output (input into the 12V system)
How to Diagnose and Resolve
- 1 Reboot the vehicle by holding both scroll wheels for 10 seconds
- 2 Check for pending OTA software updates in Controls > Software
- 3 If the alert persists, schedule a Tesla Service appointment
- 4 Describe the alert code and any symptoms when booking service
Severity Notes
EFUSE-W128 is a Warning in the Electronic Fuse system. Schedule service soon. Monitor your vehicle for additional warnings.