2021-2022 Audi A7/Q5 Drive System Warning TSB U041300

Owners of certain 2021-2022 Audi A7 and Q5 models may encounter a "drive system warning" message displayed in their vehicle's driver information system. This issue is linked to a software error within the vehicle's electrical system, specifically affecting the Battery Energy Control Module "B" and the Electric Drive Control Unit.

Audi has released Technical Service Bulletin PSS 93, also identified as 93 22 62 2065722/1, to address this condition. The bulletin confirms that a software solution is being developed to resolve the underlying problem, with an anticipated release in the third quarter of 2022.

Symptoms

The primary symptom reported by vehicle owners is the illumination of a "drive system warning" in the driver information system. This warning indicates a fault within the vehicle's drive system, prompting concern for many drivers.

Fault Codes and Diagnostic Trouble Codes (DTCs)

When this condition occurs, diagnostic scans may reveal specific fault codes stored in the vehicle's Engine Electronics (J623) and/or Electric Drive Control Unit (J841). The key diagnostic trouble code (DTC) associated with this issue is:

• U041300: "Invalid Data Received from Battery Energy Control Module “B”" with symptom code 23085.

This DTC points directly to a communication error involving the Battery Energy Control Module "B", which is a critical component in the vehicle's high-voltage battery system.

Diagnosis and Trigger Conditions

Technicians can reproduce the customer's reported "drive system warning" and confirm the presence of DTC U041300. A key diagnostic step involves checking the software version of the Battery Junction Box (BJB) SX6, which is part of the high-voltage battery system. Affected vehicles typically have BJB SX6 software versions 106 or 206.

To check the software version, technicians follow a specific procedure using the ODIS diagnostic system:

1. Navigate to Guided Functions in ODIS >> Diagnostic address 008C.
2. Select Guided Function >> "Read identification".
3. Proceed to "Read additional identification data" >> "Read and display identification data of sub-systems (slaves)".

The results, including the software version (e.g., 0106), are displayed on the scan tool and recorded in the diagnosis log. This step helps confirm if the vehicle's software matches the conditions described in TSB 93 22 62 2065722/1.

Important Warnings for Owners

Audi explicitly advises against replacing components to resolve this issue. The Technical Service Bulletin states: "Do not replace any components for this condition since this will not resolve the customer's concern." This is crucial information for owners, as attempting to replace parts like the Battery Energy Control Module "B" will not fix the underlying software error and could lead to unnecessary costs.

Owners should also be aware that a permanent software solution for the Audi A7 drive system warning U041300 is expected to be available in the third quarter of 2022. Until then, the current service procedure involves a temporary measure.

Current Service Procedure and Future Solution

Currently, the service procedure outlined in TSB 93 22 62 2065722/1 is a temporary measure while the permanent software fix is under development. Technicians are instructed to:

1. Delete the DTC U041300 from the vehicle's memory.
2. Inform the customer that a permanent software solution is forthcoming in the third quarter of 2022 and that no physical repairs or component replacements are necessary at this time. The Audi A7 drive system warning U041300 is a software issue.
3. Create a PSS (Pending Service Solutions) record in the PSS application via AccessAudi or the Technical Assistance page in Elsa.

This approach ensures that owners are aware of the situation and that the issue is documented while awaiting the final software update.

Warranty Information

Warranty claims for this condition fall under Claim Type 110 for vehicles up to 48 months or 50,000 miles. For Audi Certified Pre-Owned (CPO) vehicles, Claim Type G10 applies, requiring owner verification. If the vehicle is outside of any warranty coverage, this Technical Service Bulletin serves as informational guidance only. The Service Number for this bulletin is 9327, and the Damage Code is 0040. The diagnostic time is GFF, 0150 0000, with time stated on the diagnostic protocol (maximum 30 TU). All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual.

NHTSA ID: 10207163