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2017-2023 Audi Q7/Q8 Active Roll Stabilization Fault C129700

Audi has issued Technical Service Bulletin 2067804/1 for 2017-2023 Audi Q7, Q8, SQ7, SQ8, and RS Q8 vehicles. This TSB addresses the 'Air suspension fault' or 'roll stabilization/suspension' message and DTC C129700, providing a diagnostic and repair procedure for the roll stabilizer control units.

ByAhmet Topcu — Founder & Editor-in-Chief2023 Audi Q8
2023 Audi Q8 — Audi Q8 C129700 active roll stabilization
Editorial illustration generated for this article.
C1297001266485140 22 47 2067804/12067804"Air suspension fault""roll stabilization/suspension""Active Roll stabilization"J924J1096roll stabilizer control units

Si applica anche a

Audi Q7
2021–2023
Audi Q8
2021–2022
Audi RS Q8
2021–2023
Audi SQ7
2021–2023
Audi SQ8
2021–2023

Owners of certain 2017-2023 Audi Q7, Q8, SQ7, SQ8, and RS Q8 vehicles may encounter warning messages related to the air suspension or active roll stabilization system. This issue is addressed by Audi Technical Service Bulletin (TSB) 40 22 47 2067804/1, which provides a detailed procedure for diagnosing and resolving the underlying cause.

The TSB specifically targets situations where the diagnostic trouble code (DTC) C129700 is logged in the vehicle's control modules. This guide will help you understand the symptoms, diagnosis, and the recommended repair for the Audi Q8 C129700 active roll stabilization fault.

Symptoms

Vehicle owners may notice one or both of the following messages displayed in the instrument cluster:

  • "Air suspension fault"
  • "roll stabilization/suspension"

These messages indicate a potential issue with the vehicle's active roll stabilization system, which is crucial for ride comfort and handling.

Fault Codes / DTCs

When diagnosing this condition, technicians will typically find the following Diagnostic Trouble Code (DTC) logged in one of the two roll stabilizer control units, J924 or J1096, at diagnostic address 00D4 or 00D5.

Code Description Symptom Code
C129700 Function limitation due to malfunction in the control module 12664851

The presence of DTC C129700 indicates a function limitation within the roll stabilizer control module, specifically affecting the active roll stabilization system.

Diagnosis / Trigger Conditions

This TSB's repair procedure is applicable if no other relevant DTCs related to the suspension and/or roll stabilization system are logged. The primary condition for this TSB is the presence of DTC C129700, indicating a malfunction in the control module J924 or J1096.

Repair Procedure Summary

If no other relevant DTCs related to the suspension or roll stabilization are present, Technical Service Bulletin 2067804/1 outlines a precise sequence of actions. This procedure involves cycling the vehicle's electrical system and diagnostic connections to reset the control units. Technicians are instructed to:

  1. Unplug the diagnostic connector from the vehicle.
  2. Switch off the ignition.
  3. Lock the vehicle, ensuring all doors, the hood, and the rear lid are closed.
  4. Wait until the vehicle has entered bus sleep mode. This process ensures the control modules fully power down and reset.
  5. Unlock the vehicle.
  6. Plug the diagnostic connector back into the vehicle.
  7. Switch on the ignition.
  8. Attempt to erase any stored DTCs.
  9. Perform the step labeled "Replace Control Module" on both roll stabilization control units J924 and J1096 using the ODIS tester. It is crucial to note that this step refers to a software procedure within the ODIS tester, and technicians should not physically replace the control unit.

If the DTC C129700 is still logged after performing these steps, technicians should follow the instructions provided in Guided Fault Finding to resolve the issue. If no DTCs are stored after the procedure, the vehicle can be released.

Important Warnings

  • Do not replace the control unit: The TSB explicitly states to perform the

Frequently Asked Questions

What does the 'Air suspension fault' message mean in my Audi Q8?
If your 2017-2023 Audi Q8 displays an 'Air suspension fault' or 'roll stabilization/suspension' message, it indicates a potential issue with the active roll stabilization system. This often correlates with Diagnostic Trouble Code (DTC) C129700.
What is DTC C129700 and what does it affect?
DTC C129700, with symptom code 12664851, signifies a 'Function limitation due to malfunction in the control module' within your Audi's active roll stabilization system. This fault is typically logged in the J924 or J1096 roll stabilizer control units at diagnostic addresses 00D4 or 00D5.
Is there a recall for Audi Q7/Q8 active roll stabilization issues?
This specific issue is addressed by Technical Service Bulletin (TSB) 2067804/1, not a recall. TSBs provide repair procedures for common issues, while recalls are issued for safety defects or non-compliance with federal standards. Your dealer can perform the TSB procedure.
What should I do if I see an 'Air suspension fault' or 'roll stabilization/suspension' message?
If you experience an 'Air suspension fault' or 'roll stabilization/suspension' message in your 2017-2023 Audi Q7, Q8, SQ7, SQ8, or RS Q8, it is recommended to contact your authorized Audi dealer. They can diagnose the issue using TSB 2067804/1 and perform the necessary steps to resolve the Audi Q8 C129700 active roll stabilization fault.
Will this repair be covered under warranty?
Warranty coverage for this repair depends on your vehicle's age and mileage. For vehicles up to 48 months or 48,000 miles, it may be covered under Claim Type 110. For CPO vehicles, Claim Type G10 applies. If your vehicle is outside of warranty, this Technical Service Bulletin is informational only, and costs may apply.

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