2025-2026 Audi e-tron GT Yellow Electrical System Fault U019B00

Owners of 2025-2026 Audi e-tron GT and RS e-tron GT models may encounter a specific issue indicated by a "Yellow electrical system fault" message in the instrument cluster. This condition, often accompanied by diagnostic trouble code U019B00, can prevent the vehicle from starting. Audi has issued Technical Service Bulletin (TSB) 93 24 19 2075400/2, a Pending Service Solution (PSS), to address this concern.

Symptoms of the Audi e-tron GT Yellow Electrical System Fault

If your 2025-2026 Audi e-tron GT is affected by this issue, you might observe the following:

• A "Yellow electrical system fault" message appearing in the instrument cluster.
• The vehicle being unable to start.
• The ability to drive the vehicle again after switching the ignition off and then back on.

This Audi e-tron GT yellow electrical system fault is primarily linked to communication issues within the vehicle's electrical system.

Diagnostic Trouble Codes (DTCs)

When diagnosing this issue, technicians will typically find specific Diagnostic Trouble Codes (DTCs) stored in the vehicle's control modules:

• U019B00 - "Lost communication with Battery Charger Control Module." This code is usually logged in the Gateway control module (J533, address word 0019).
• Additional DTCs with titles such as "Lost communication with High-Voltage Battery Control Module" or similar may also be present in various other control units.

These codes indicate a loss of communication between the Battery Charger Control Module and other critical control modules, leading to the Audi e-tron GT yellow electrical system fault.

Important Warnings for Owners and Technicians

Audi has provided specific guidance regarding this issue:

• Do not replace any components for this condition, as doing so will not resolve the underlying problem. The issue is expected to be software-related.
• Owners should be informed that if the vehicle cannot be started, cycling the ignition off and on again will typically allow the vehicle to start and be driven.
• Audi is actively working on a software solution. Information regarding the availability of this planned solution is not expected before the first quarter of 2025, and this timeline is subject to change.

Current Status and Manufacturer's Recommendation

This TSB, identified as 93 24 19 2075400/2 (superseding 93 24-18), is a Pending Service Solution (PSS). This means a permanent fix is still under development. Audi's current recommendation for technicians is to explain the situation to customers and create a PSS record in the AccessAudi system. This helps Audi track the prevalence of the Audi e-tron GT yellow electrical system fault and ensures that affected vehicles are noted for future updates.

Warranty Information

For vehicles still under warranty, this Technical Service Bulletin provides guidance for processing claims. The Service Number is 9352, and the Damage Code is 0039. Labor operations include GFF/Guided Functions (0150 0010) and GFF (0150 0060), with claims to be submitted as per TSB 2075400/2. If the vehicle is outside of its warranty period, this bulletin serves as informational guidance only.

Next Steps for Owners

If your 2025-2026 Audi e-tron GT or RS e-tron GT exhibits the "Yellow electrical system fault" or experiences starting issues related to DTC U019B00, you should:

1. Attempt to restart the vehicle by turning the ignition off and then on again.
2. Contact your authorized Audi dealership to report the issue. They will create a PSS record for your vehicle, ensuring you are in the system for future updates and the eventual software solution.
3. Do not authorize any component replacements for this specific issue, as Audi advises against it.

NHTSA ID: 11009405