2021-2024 Audi Q7/Q8 Active Roll Stabilization DTC C129700

Symptoms

Owners of 2021-2024 Audi Q7, Q8, SQ7, SQ8, and RS Q8 vehicles equipped with Dynamic Ride Control may notice warning messages appearing in their instrument cluster. These messages typically include an "Air suspension fault" and/or a message concerning the "roll stabilization/suspension" system. If you encounter these warnings, your vehicle may be experiencing the condition described in this bulletin, often linked to an Audi Q8 active roll stabilization C129700 fault.

Fault Codes / DTCs

When these symptoms occur, a Diagnostic Trouble Code (DTC) C129700 may be logged. This specific DTC is associated with symptom code 12664851 and indicates a "Function limitation due to malfunction in the control module." The fault code C129700 will typically be found in one of the two roll stabilizer control units, specifically J924 or J1096, which correspond to diagnostic addresses 00D4 or 00D5.

Revision History and Superseded Bulletins

This Technical Service Bulletin (TSB) 2067804/3 is the third revision, published on January 18, 2024. It supersedes a previous bulletin, TSB Group 40 number 23-58, which was dated May 25, 2023. The initial publication (Revision 1) of this TSB was on August 18, 2022. Revisions primarily involved updating the header to include revised and added model years to the affected vehicle list.

Diagnosis and Trigger Conditions

The presence of DTC C129700 in either the J924 or J1096 control unit, along with the instrument cluster warnings, points to an issue with the active roll stabilization system. This condition specifically affects vehicles equipped with Dynamic Ride Control. The Technical Service Bulletin 2067804/3 provides a specific procedure for addressing this condition, ensuring proper diagnosis and resolution for the Audi Q8 active roll stabilization C129700 issue.

Important Warnings

During the diagnostic and service procedure, it is crucial to follow the instructions precisely. When prompted by the ODIS tester to perform the "Replace Control Module" step on roll stabilization control units J924 and J1096, do not replace the control unit. This TSB specifically states that replacing the control unit is not the correct action for this particular DTC C129700. Incorrectly replacing the control unit will not resolve the underlying issue.

Repair Procedure Summary

If no other relevant DTCs related to the suspension or roll stabilization are present, technicians should follow a specific sequence of steps to address the Audi Q8 active roll stabilization C129700 fault:

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.
5. Unlock the vehicle.
6. Plug the diagnostic connector back into the vehicle.
7. Switch on the ignition.
8. Attempt to erase the DTCs.
9. Then perform the step "Replace Control Module" on both roll stabilization control units J924 and J1096 with the ODIS tester, but remember, do not replace the actual control unit as this will not resolve the C129700 fault.

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

Warranty Information

Warranty claims for this issue are processed under specific guidelines:

• Claim Type: Type 110 applies for vehicles up to 48 months or 48,000 miles. Type G10 is used for CPO (Certified Pre-Owned) Covered Vehicles, requiring owner verification.
• Informational Only: If the vehicle is outside of any applicable warranty, this Technical Service Bulletin is informational only, meaning the repair would not be covered.
• Service Number: 4024
• Damage Code: 0040
• Labor Operations:
  • Check vehicle (CAN BUS Sleep mode): Labor operation 0689 0199, 10 Time Units (TU).
  • Diagnostic Time (GFF): Labor operation 0150 0000, Time stated on the diagnostic protocol (Maximum 50 TU).
  • Road test prior to the service procedure: No allowance, 0 TU.
  • Road test after the service procedure: Labor operation 0121 004, 10 TU.
• Claim Comment: As per TSB 2067804/3.

Source: NHTSA ID: 10249767