2021-2024 Audi Air Suspension Malfunction Warning TSB

Owners of 2021-2024 Audi vehicles may encounter an "Air suspension malfunction warning" in their instrument cluster. This issue is detailed in Audi Technical Service Bulletin (TSB) 2059363/5, which outlines the diagnostic and repair procedures for related fault codes. This TSB supersedes an earlier bulletin, Group 43 number 23-78, dated August 24, 2023, with the current revision 5 issued on April 5, 2024.

This bulletin specifically addresses instances where the Audi e-tron air suspension warning appears, often accompanied by specific diagnostic trouble codes (DTCs) stored in the suspension control module.

Symptoms

The primary symptom owners will notice is an "Air suspension malfunction warning in the instrument cluster" accompanied by a symbol for the air spring. This indicates a potential problem with the vehicle's air suspension system.

Fault Codes / DTCs

When diagnosing the Audi e-tron air suspension warning, technicians may find one of the following DTCs stored in the suspension control module, J775 (address word 0074):

Code	Description	Symptom Code
C1260F0	compressor control unit for adaptive suspension, no communication	262400
U112100	data bus, missing message	262400

Diagnosis / Trigger Conditions

The root cause of these DTCs and the "Air suspension malfunction warning" can often be traced to communication issues between the suspension control module J775 and the compressor control module J1135. An improved software solution was introduced in August 2023 to address some of these concerns.

Technicians are instructed to check for any irregularities in the wiring and connector contacts between the suspension control module J775 and the compressor control module J1135. This initial inspection helps rule out simple connection problems.

Repair Procedure Summary

The repair procedure for the Audi e-tron air suspension warning depends on the nature of the stored DTCs:

• If the DTC (C1260F0 or U112100) is passive or sporadic, the technician should delete the DTC and release the vehicle. This suggests a temporary fault that may not require component replacement.
• If the DTC is active or static, indicating a persistent problem, the compressor control unit J1135 must be replaced. This replacement should follow the detailed instructions found in the Elsa Repair Manual, specifically under Chassis >> Suspension, Wheels, Steering >> 43 Self Levelling Suspension >> Air Suspension >> Level Control System Compressor Electronics J1135, Removing and Installing.
• Furthermore, if either DTC C1260F0 (262400) or U112100 (262400) is stored for a second time in the suspension control unit J775 as passive/sporadic, the compressor control unit J1135 must be replaced.

Important Warnings

Owners should be aware that if their vehicle is outside of any applicable warranty coverage, this Technical Service Bulletin is for informational purposes only, and repair costs may not be covered.

Warranty Information

Repairs performed under TSB 2059363/5 are generally covered under Audi's warranty. This includes vehicles up to 48 months or 50,000 miles. For Certified Pre-Owned (CPO) vehicles, coverage is provided under claim type G10. The service number for this repair is 4316, with a damage code of 0039. All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual.

Required Tools or Parts

For the replacement of the compressor control unit J1135, technicians should consult ETKA for the specific part number (01) for the "Level Control System Compressor Electronics J1135." Additionally, any necessary fasteners, bolts, nuts, and screws should be sourced as specified in the repair manual.

Owner Action

If your 2021-2024 Audi vehicle displays an "Air suspension malfunction warning" or you suspect an issue with your air suspension, especially if you've seen DTCs C1260F0 or U112100, it is recommended to schedule an appointment with an authorized Audi service center. Inform them about the symptoms and reference Audi Technical Service Bulletin 2059363/5 for proper diagnosis and repair.

Source: NHTSA ID 10253255