EFUSE-W155
EFUSE_w155_12VTempSensDiscnect
Also written as EFUSE_W155 / EFUSE W155 / EFUSE_w155_12VTempSensDiscnect / efuse_w155_12vtempsensdiscnect
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-W155 mean?
Tesla warning code in the Electronic Fuse (EFUSE) module. The temperature sensor for the 12V battery is disconnected from the E-fuse and reporting open circuit on the harness. This will result in a default voltage set-point being used for charging the 12V battery, which will not be optimized for the present temperature. As a result, it is likely the 12V battery life will be reduced.
Original Description
The temperature sensor for the 12V battery is disconnected from the E-fuse and reporting open circuit on the harness. This will result in a default voltage set-point being used for charging the 12V battery, which will not be optimized for the present temperature. As a result, it is likely the 12V battery life will be reduced.
Affected Tesla Models
What You May Notice
- Electronic Fuse alert: The temperature sensor for the 12V battery is disconnected from the E-fuse and reporting open circuit on the harness. Th
- Related vehicle feature may be reduced or unavailable
- Alert visible in the Tesla app: The temperature sensor for the 12V battery is disconnected from the E-fuse and r
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-W155 is a Warning in the Electronic Fuse system. Schedule service soon. Monitor your vehicle for additional warnings.