Is GTW_W157 the same as GTW-W157?

Yes. GTW_W157, GTW W157, and GTW-W157 are alternate spellings of the same Tesla alert code. Also written as: GTW-W157, GTW_W157, GTW W157, GTW_w157_lowVoltageSupportFault, gtw_w157_lowvoltagesupportfault.

What symptoms can GTW-W157 cause?

Gateway alert: There has been an issue in providing support to the low voltage (LV) bus, and the voltage has dropped below the target. One or more features may temporarily be unavailable Usually resolves after a reboot

What should I check for GTW-W157?

1. Perform a soft reboot (hold both scroll wheels) 2. Check for pending OTA software updates 3. Schedule service if the alert recurs frequently

Is it safe to drive with GTW-W157?

🟡 Check the vehicle display for drive or charge restrictions and schedule service promptly.

TESLA Warning

GTW-W157

GTW_w157_lowVoltageSupportFault

Also written as GTW_W157 / GTW W157 / GTW_w157_lowVoltageSupportFault / gtw_w157_lowvoltagesupportfault

System

GTW

Gateway

Type

Warning

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 GTW-W157 mean?

Tesla warning code in the Gateway (GTW) module. There has been an issue in providing support to the low voltage (LV) bus, and the voltage has dropped below the target. This can be caused by: Wiring issues between the DCDC and rest of vehicle on LV harness (B+ or ground).Loose 12V battery positive or negative connections at either end of the harness.No LV support provided due to low Battery Management System (BMS) State of Charge (SOC).No LV support provided due to BMS issues.No LV support provided due to DCDC issues.No LV support provided due to E-fuse DCDC fuse tripped.DCDC is not enabled by the BMS or E-fuse.Controller area network (CAN) bus issues with PT or BDY. This alert does not mean the 12V battery is bad. It means the vehicle is not adequately supporting the 12V battery and LV system.

Original Description

There has been an issue in providing support to the low voltage (LV) bus, and the voltage has dropped below the target. This can be caused by: Wiring issues between the DCDC and rest of vehicle on LV harness (B+ or ground).Loose 12V battery positive or negative connections at either end of the harness.No LV support provided due to low Battery Management System (BMS) State of Charge (SOC).No LV support provided due to BMS issues.No LV support provided due to DCDC issues.No LV support provided due to E-fuse DCDC fuse tripped.DCDC is not enabled by the BMS or E-fuse.Controller area network (CAN) bus issues with PT or BDY. This alert does not mean the 12V battery is bad. It means the vehicle is not adequately supporting the 12V battery and LV system.

Affected Tesla Models

Model SModel XModel 3Model YCybertruck

What You May Notice

Gateway alert: There has been an issue in providing support to the low voltage (LV) bus, and the voltage has dropped below the target.
One or more features may temporarily be unavailable
Usually resolves after a reboot

How to Diagnose and Resolve

1 Perform a soft reboot (hold both scroll wheels)
2 Check for pending OTA software updates
3 Schedule service if the alert recurs frequently

Severity Notes

GTW-W157 is a Warning in the Gateway system. Schedule service soon. Monitor your vehicle for additional warnings.

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