2021 Audi A6 Transmission Oil Leak TSB 2061714/2

Owners of 2021 Audi A4, A5, A6, A7, and Q5 vehicles may experience an oil leak from the transmission case. This issue, along with potential transmission malfunction messages or gear noises, is addressed by Audi Technical Service Bulletin (TSB) 34 22 55 2061714/2. This TSB outlines the diagnostic and repair procedures for resolving the 2021 Audi A6 transmission oil leak and similar issues in other affected models.

Symptoms of a Transmission Oil Leak

Owners might notice several signs indicating a transmission oil leak. The most common symptom is "An oil leak was noticed under the vehicle." Additionally, drivers may observe "A transmission malfunction message is displayed in the instrument cluster" or hear "Gear noises are heard" coming from the transmission.

Workshop findings confirm that the oil is typically found leaking from the transmission case, specifically from the bolts located on the side of the case.

Technical Background

According to Audi, the root cause of these transmission oil leaks is missing seals from the bearing plate bolts within the transmission case. This allows transmission fluid to escape, leading to the observed symptoms.

Important Warnings for Owners and Technicians

When diagnosing and repairing transmission leaks, it is crucial to follow specific guidelines:

• Do not use oil dyes in any Audi transmission. This practice is explicitly prohibited as it can cause further issues.
• If the oil leak originates from any area of the transmission other than the bearing plate bolts, this TSB 34 22 55 2061714/2 does not apply. Further diagnosis and repair should proceed according to standard warranty policies.
• If your vehicle is outside of its warranty period, this Technical Service Bulletin is for informational purposes only, meaning repairs may not be covered.

Repair Procedure Summary

The repair for a 2021 Audi A6 transmission oil leak involves a precise sequence of steps:

1. Preparation: Clean and thoroughly remove all oil residue from the transmission, allowing the surface to dry completely.
2. Leak Confirmation: Apply oil leak tracing powder to the suspected areas to confirm the exact location of the leak. This helps ensure that the leak is indeed from the bearing plate bolts.
3. Inspection: Visually check the bearing plate bolts for signs of oil leakage.
4. Bolt Replacement: If the leak is confirmed to be from one or more bearing plate bolts, replace only the leaking bolts according to the detailed instructions in the repair manual. In some cases, removing the transmission may be necessary to access certain bolts.
5. Fluid Level Adjustment: Check and top up the MTF (Manual Transmission Fluid) oil level to the correct specification.
6. Final Check: Perform a test drive of the vehicle and recheck for any remaining leaks.

Required Parts and Tools

Technicians will need specific parts and materials to perform this repair:

• Fasteners, Bolts, Nuts, and Screws: As needed per the repair manual (refer to ETKA/ELSA).
• Hexagon socket head bolt: Part Number WHT009043 (as needed).
• Transmission oil MTF: Part Number G 055549A2 (up to 4 liters maximum, as needed to correct the level).
• Oil leak locating spray: Part Number G 001900A1 (or equivalent, considered a shop supply).

Warranty Information

This repair, identified by Service Number 3435 and Damage Code 0050, is covered under specific warranty conditions:

• Standard Warranty: Applicable for vehicles up to 48 months or 50,000 miles.
• CPO Vehicles: Claim type G10 applies for Certified Pre-Owned vehicles, requiring owner verification.
• Labor Operations: Specific labor codes include 3435 19XX for removing and installing the gearbox (if required) and 3435 5199 for replacing leaking bolts. Diagnostic time is 0150 0000 (maximum 50 TU), with a 10 TU allowance for the post-service road test (0121 0004).

All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual. This TSB 34 22 55 2061714/2 supersedes Technical Service Bulletin Group 34 number 20-50 dated December 17, 2020.

NHTSA ID: 10210234