2024-2026 Audi e-tron GT Electrical System Fault B182D16

Owners of 2024-2026 Audi e-tron GT and RS e-tron GT models may encounter a specific warning message in their instrument cluster: "Electrical system: fault. Please contact workshop." This message is often triggered by a diagnostic trouble code (DTC) related to the high-voltage heating system. Audi has released Technical Service Bulletin (TSB) 93 24 09 2074915/1 to provide clarification on this issue, ensuring proper diagnosis and preventing unnecessary part replacements.

This TSB, dated August 29, 2024, is crucial for understanding the root cause of the Audi e-tron GT electrical system fault B182D16 and guiding appropriate service actions.

Symptoms

Owners will typically observe a yellow warning message displayed prominently in the instrument cluster. The exact wording of this message is: "Electrical system: fault. Please contact workshop". This visual alert indicates a potential issue within the vehicle's electrical system, prompting the driver to seek professional assistance.

Fault Codes / DTCs

When the "Electrical system: fault. Please contact workshop" message appears, workshops will often find a specific diagnostic trouble code logged in the Thermal management control module -J1024- (address word 00C5). This code provides more detail about the nature of the fault.

Code	Description
B182D16	HV heater 2, voltage too low

This DTC, B182D16, specifically points to an issue with the second high-voltage heater's voltage supply. It's important to note that the code indicates a supply problem, not necessarily a heater malfunction.

Diagnostic Clarification

Audi TSB 93 24 09 2074915/1 clarifies the interpretation of the B182D16 fault code. The presence of this event memory entry does not signify that the high-voltage heater itself is defective. Instead, it indicates that the necessary voltage supply to the high-voltage heater is missing.

The component, HV heater 2, is still functional despite the fault code. This distinction is critical for proper repair and avoiding unnecessary costs.

Important Warnings

The TSB explicitly states a key directive for technicians and owners regarding the Audi e-tron GT electrical system fault B182D16:

• Do not replace the HV heater 2. The component still works and must not be replaced, as replacing it will not resolve the underlying issue of the missing voltage supply.

This warning prevents misdiagnosis and the replacement of a perfectly functional part, which would not fix the customer's concern and could lead to additional, unwarranted expenses.

Owner Action

If you experience the "Electrical system: fault. Please contact workshop" message in your 2024-2026 Audi e-tron GT or RS e-tron GT, it is recommended to schedule a service appointment with an authorized Audi dealership. Inform them about the specific warning message and mention the potential relevance of TSB 93 24 09 2074915/1 and DTC B182D16.

Since this TSB is informational and clarifies a diagnostic path rather than outlining a specific repair procedure, the dealership will need to investigate the cause of the missing voltage supply to the HV heater 2. This issue is not applicable to Audi Warranty claims as per the TSB's warranty section, indicating it's a diagnostic guideline rather than a defect requiring a specific warranty repair.

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Source: NHTSA ID: 11007359