What does Audi TSB 2056944/6 address?

Audi TSB 2056944/6 addresses the issue of water entering the cabin from the sunroof area in certain 2021 Audi Q3, Q8, and e-tron models, providing detailed diagnostic and repair procedures.

What are the common causes of a sunroof water leak in affected Audi models?

Common causes include pinched or obstructed sunroof drain hoses, detached or malformed roof opening seals, misaligned glass sunroof panels, and water breaching the sunroof frame's normal drainage, especially around the wind deflector.

Is the repair for an Audi e-tron sunroof water leak covered under warranty?

Yes, repairs for this issue are generally covered under Audi's warranty for up to 48 months or 50,000 miles, whichever comes first. Specific coverage may also apply to Certified Pre-Owned (CPO) vehicles.

What special tools are used to fix the sunroof water leak?

Special tools mentioned in TSB 2056944/6 include the VAS6620 Sunroof Drain Snake for clearing obstructions and a 3356 roller tool for applying pressure during the wind deflector modification.

2021 Audi Q3, Q8, e-tron Sunroof Water Leak TSB 2056944/6

Owners of certain 2021 Audi Q3, Q8, and e-tron models may experience an Audi e-tron sunroof water leak or water intrusion into the cabin from the sunroof area. Audi has issued Technical Service Bulletin (TSB) 2056944/6 to provide diagnostic and repair procedures for this issue.

Symptoms

The primary symptom reported by vehicle owners is a visible water drip from the headliner area. This water intrusion can occur during rain, car washes, or even when the vehicle is stationary with standing water on the roof panel.

Diagnosis / Trigger Conditions

Audi's technical background identifies several potential scenarios that could lead to an Audi e-tron sunroof water leak:

Sunroof Drain Hose or Outlet Valve Issues: The drain hoses can become pinched, kinked, or obstructed with debris, preventing proper water drainage. Technicians use a VAS6620 Sunroof Drain Snake to check for blockages.
Roof Opening Seal Problems: The seal around the sunroof opening may be detached or malformed, allowing water to bypass the drainage system.
Glass Sunroof Panel Misalignment: Poor adjustment of the sunroof glass panels can create gaps where water can enter.
Sunroof Frame Water Entry: Water can enter the sunroof frame and breach normal water drainage channels, especially if the sunroof is opened or vented while the vehicle is wet. Water may also migrate along the wind deflector hinge arms or enter the wind deflector's stowage area, which is not water-tight and lacks drainage.

Repair Procedure Summary

The repair process involves a comprehensive inspection and, if necessary, corrective actions for each potential cause of the Audi e-tron sunroof water leak. The steps include:

Drain Hose Inspection and Cleaning: Ensure water flows freely through the sunroof frame drainage areas. If a drain hose is pinched or kinked, it must be replaced.
Roof Opening Seal Replacement: If the roof opening seal is found to be detached, malformed, or damaged during inspection, it will be replaced.
Glass Sunroof Panel Adjustment: If dimensional measurements indicate an issue with the sunroof glass panels, they will be adjusted to ensure proper sealing.
Sunroof Frame Inspection: The sunroof frame is inspected for damage like cracks or holes in the drainage structure. Frame replacement is only necessary if damage is found, and the damaged area must be clearly marked for analysis by Audi of America (AoA).
Wind Deflector Modification: This involves several steps to improve water flow and drainage:
- Locate the sunroof wind deflector mounting points.
- Inspect the wind deflector for a redesigned version that includes small tabs. If the older design is present, the wind deflector will be replaced with the redesigned part.
- Clean the sunroof frame area thoroughly using a primer applicator and all-purpose cleaner.
- Apply two 25mm strips of Butyl adhesive/sealing cord into the designated groove to ensure a watertight seal.
- Modify the sunroof glass panel by bonding two small pads to the front corners inside the rubber 'skirt'. This creates a gap to prevent water from contacting the sunroof mechanism.
- Clean the glass panel 'skirt' surface and apply bonding agent, allowing it to dry completely.
- Cut two 10mm x 10mm packing pads and bond them to the front areas of the sunroof glass panel 'skirt'.
- Use a roller tool to apply firm pressure to the newly adhered pads, enhancing adhesion strength.

Required Tools or Parts

Special tools and specific parts are required to perform the repairs outlined in TSB 2056944/6:

D 00940104 (or equivalent) surface preparation solvent (e.g., isopropyl alcohol) - All Purpose Cleaner
D 355205A2 (or equivalent) adhesion promoter (e.g., 3M™ 111 Adhesion Promoter or AC77 Adhesive Primer) - Bonding Agent
D 00950025 (or equivalent) - Primer Applicator
AKL45000505 - Butyl Adhesive / Sealing Cord
251201525 - Packing
83A877459 / 83A877459A - Roof opening perimeter seal (Audi e-tron quattro, Audi e-tron Sportback, Q3)
4M0877459C - Roof opening perimeter seal (Q8)
4KE877201 / 4KE877201A - Front sunroof water drain hoses (Audi e-tron quattro, Audi e-tron Sportback)
4KE877203 / 4KE877203A - Rear sunroof water drain hoses (Audi e-tron quattro)
4K4877203 - Rear sunroof water drain hoses (Audi e-tron Sportback)
4M8877201 - Front sunroof water drain hoses (Q8)
4M8877204 - Right rear sunroof water drain hoses (Q8)
4M8877203 - Left rear sunroof water drain hoses (Q8)
83A877201 / 83A877201A - Front sunroof water drain hoses (Q3)
83A877204 / 83A877204A - Right rear sunroof water drain hoses (Q3)
83A877203 / 83A877203A - Left rear sunroof water drain hoses (Q3)
4M8877651 - Wind Deflector
VAS6620 - Sunroof drain snake
3356 (or equivalent tool) - Roller Tool

Owner Action

If you notice water dripping from your vehicle's headliner, it is recommended to schedule an appointment with an authorized Audi dealer. They will perform the necessary inspections and repairs as outlined in TSB 2056944/6. Warranty coverage for this issue typically extends up to 48 months or 50,000 miles, and specific provisions exist for Certified Pre-Owned (CPO) vehicles.

Source: NHTSA ID: 10188598