2021-2023 Audi Q7/Q8 Rear Suspension Lowering TSB

Owners of 2021-2023 Audi Q7, Q8, SQ7, SQ8, and RS Q8 vehicles may experience an issue where the rear suspension lowering function is intermittently unavailable. This problem is addressed by Audi Technical Service Bulletin (TSB) 2059841/3, which supersedes TSB Group 43 number 22-64 dated July 8, 2022.

This TSB provides guidance for diagnosing and resolving the Audi Q7 Q8 rear suspension lowering concern, which is often triggered by specific fault codes related to the suspension control system.

Symptoms

The primary symptom reported by owners is that the "rear suspension lowering is intermittently not available." This means the vehicle's rear suspension may not lower as expected when the function is activated, leading to inconvenience or difficulty with loading and unloading.

Fault Codes / DTCs

When this issue occurs, workshop findings indicate that one or both of the following Diagnostic Trouble Codes (DTCs) may be logged in the suspension control module, J775 (address word 0074):

Code	Description
C11B515	"Button for high load level, interruption/short circuit to positive"
C11B615	"Button for low load level, interruption/short circuit to positive"

Diagnosis and Trigger Conditions

The technical background for this Audi Q7 Q8 rear suspension lowering issue suggests that the problem often arises if the button for the rear suspension lowering is unintentionally operated while driving. This can happen, for example, if objects moving in the trunk area press the button. When this occurs, the rear suspension lowering function becomes sporadically unavailable.

Important Warnings

Audi explicitly states: "Do not replace the J775 or the button for the rear suspension lowering or any other component in the vehicle." This warning is crucial as it prevents unnecessary parts replacement and associated costs, indicating that the solution does not involve hardware replacement.

Repair Procedure Summary

The repair procedure outlined in TSB 2059841/3 is straightforward and does not involve complex mechanical work:

1. Explain Functionality: Technicians are instructed to explain the functionality of the system to the customer. This includes informing them about the possibility of unintentional operation of the lowering button while driving.
2. Clear DTCs: The next step is to clear any logged DTCs (C11B515 or C11B615) from the suspension control module.
3. Release Vehicle: After clearing the codes, the vehicle can be released to the customer.

This process indicates that the issue is primarily a software or operational anomaly rather than a component failure.

Warranty Information

This Technical Service Bulletin provides specific details regarding warranty claims:

• Claim Type 110: Applicable for vehicles up to 48 months or 50,000 miles.
• Claim Type G10: For Certified Pre-Owned (CPO) vehicles, requiring owner verification.
• If the vehicle is outside of any applicable warranty, this TSB is for informational purposes only.

The Service Number for this procedure is 4316, and the Damage Code is 0040. Diagnostic time (GFF) is allocated at 0150 0000, with a maximum of 20 Technical Units (TU) as per the diagnostic protocol. No allowance is provided for road tests before or after the service procedure.

All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual and are subject to review or audit by Audi Warranty. The claim comment should reference TSB 2059841/3.

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Source: NHTSA ID: 10217631