2017-2023 Audi Q7/Q8/SQ7/SQ8/RS Q8 Active Roll Stabilization DTC C129700

Owners of certain 2017-2023 Audi Q7, 2019-2023 Q8, and 2020-2023 SQ7, SQ8, and RS Q8 models equipped with Dynamic Ride Control may encounter warning messages related to the active roll stabilization system. This issue is detailed in Audi Technical Service Bulletin (TSB) 40 23 58 2067804/2, which was issued on May 25, 2023. This bulletin supersedes the earlier Technical Service Bulletin Group 40 number 22-47, dated August 18, 2022, due to a revised header that added model years.

This TSB specifically addresses situations where the instrument cluster displays messages such as "Air suspension fault" or a general message concerning the "roll stabilization/suspension" system. These warnings are typically accompanied by a specific diagnostic trouble code (DTC), C129700, indicating a malfunction in the control module.

Symptoms

Drivers may notice one or both of the following messages appearing in their vehicle's 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 maintaining vehicle stability and ride comfort, especially in models with Dynamic Ride Control.

Fault Codes / DTCs

When these symptoms occur, workshop diagnostics will typically reveal a specific DTC logged in one of the two roll stabilizer control units, J924 or J1096 (diagnostic address 00D4 or 00D5). The primary fault code associated with this condition is:

Code	Symptom Code	Description	Module / Address
C129700	12664851	Function limitation due to malfunction in the control module	J924 or J1096 (00D4/00D5)

This DTC, C129700, points to a functional limitation within the control module itself, rather than a mechanical failure of the roll stabilization components. This is particularly relevant for the Audi Q7 Q8 active roll stabilization C129700 issue.

Diagnosis and Trigger Conditions

The TSB outlines a specific diagnostic approach for the Audi Q7 Q8 active roll stabilization C129700 issue. The presence of DTC C129700 in the J924 or J1096 roll stabilizer control units, without other related suspension or roll stabilization DTCs, indicates the need for a system reset rather than component replacement. The procedure involves a sequence of steps designed to allow the control units to enter bus sleep mode and then be reinitialized.

Important Warnings

Audi explicitly states a critical instruction for technicians regarding this issue: when performing the "Replace Control Module" step on the roll stabilization control units J924 and J1096 with the ODIS tester, technicians should not replace the control unit. This step is a software-based reinitialization, not a hardware replacement.

Furthermore, for vehicles outside of their warranty period, this Technical Service Bulletin is for informational purposes only. This implies that repairs may not be covered by Audi if the vehicle is no longer under warranty.

Repair Procedure Summary

If no other relevant DTCs related to the suspension and/or roll stabilization are logged, the following steps should be performed:

1. Unplug the diagnostic connector from the vehicle.
2. Switch off the ignition.
3. Lock the vehicle (ensure doors, hood, and rear lid are closed).
4. Wait until the vehicle has entered bus sleep mode.
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. Then, perform the "Replace Control Module" step on both roll stabilization control units J924 and J1096 using the ODIS tester. It is crucial to remember not to replace the actual control unit during this step.

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

Warranty Information

This service is covered under specific warranty conditions:

• Claim Type 110: Up to 48 Months/48,000 Miles.
• Claim Type G10: For CPO (Certified Pre-Owned) Covered Vehicles, requiring owner verification.
• Service Number: 4024
• Damage Code: 0040
• Labor Operations:
  • Check vehicle (CAN BUS Sleep mode): 0689 0199 (10 Time Units)
  • GFF (Guided Fault Finding): 0150 0000 (Time stated on the diagnostic protocol, Max 50 Time Units)
  • Road test prior to service procedure: No allowance (0 Time Units)
  • Road test after service procedure: 0121 004 (10 Time Units)
• Claim Comment: As per TSB 2067804/2.

All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual and are subject to review or audit by Audi Warranty. If the vehicle is outside any warranty, this Technical Service Bulletin is informational only.

Revision History

This Technical Service Bulletin, 40 23 58 2067804/2, is Revision 2, published on May 25, 2023. It supersedes Revision 1, which was initially published on August 18, 2022, as Technical Service Bulletin Group 40 number 22-47. The primary reason for the revision was to update the header to include additional model years.

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Source: NHTSA ID: 10240974