Audi · Known Issues

2020 Audi A6 Problems: 6 Known Issues

2020 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated September 2026

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2020 Audi A6 has 6 documented known issues, with 2 rated critical. The most serious are Gateway Control Module Liquid-Ingress Recall 90V2 (22V-861) ($0-$0 repair) and 48V Belt Starter-Generator Warning and VIN-Specific Campaigns. Across all issues with published estimates, repair costs range from $100 to $2,500. DIY maintenance guides at au7o.io.

Frequently Asked Questions

What are the most common Audi A6 problems?

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2020 Audi A6 has 6 documented issues. The most frequently reported are: Gateway Control Module Liquid-Ingress Recall 90V2 (22V-861), 48V Belt Starter-Generator Warning and VIN-Specific Campaigns, 2019-2021 A6 3.0L Misfire Codes - Check ECM Software Before Mechanical Cleaning. Of these, 2 are rated critical and should be addressed promptly.

Is the Audi A6 reliable?

The 2020 Audi A6 has 6 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 2 issues are rated critical: Gateway Control Module Liquid-Ingress Recall 90V2 (22V-861) and 48V Belt Starter-Generator Warning and VIN-Specific Campaigns. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common Audi A6 problems?

Repair costs for known Audi A6 issues range from $0 to $2,500, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Gateway Control Module Liquid-Ingress Recall 90V2 (22V-861), typically costs $0-$0 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2019-2022 Audi A6 Gateway Control Module Liquid-Ingress Recall 90V2 (22V-861)?

Certain 2019-2022 Audi A6 Sedan and 2020-2022 A6 allroad vehicles are included in safety recall 22V-861, Audi campaign 90V2. Liquid spilled on the rear seat can reach the gateway control module beneath the rear middle seat. If the module detects implausible signals or internal sh… Repairs typically run $0-$0. Severity: high.

What is the 2019-2025 Audi A6 48V Belt Starter-Generator Warning and VIN-Specific Campaigns?

A 48V electrical-system warning on a mild-hybrid A6 is not repaired with an ordinary 12V battery, charger, alternator, or starter. Certain 2019-2020 2.0T mild-hybrid vehicles are covered by safety recall 27H2 or 20V-153 for moisture intrusion into the belt starter generator, whic… Severity: high.

What is the 2019-2021 Audi A6 2019-2021 A6 3.0L Misfire Codes - Check ECM Software Before Mechanical Cleaning?

For a 2019-2021 Audi A6 equipped with the 3.0L TFSI engine, the malfunction indicator lamp may illuminate with P0300 and one or more cylinder-specific P0301-P0306 codes. Audi's service information identifies an applicable ECM software-calibration condition and publishes model-yea… Severity: medium.

What is the 2005-2023 Audi A6 Water Pump and Thermostat Failure (Overheating)?

Water pump failures are common across all A6 generations due to plastic impeller degradation and seal leaks. Audi uses plastic impellers that crack or disintegrate over time (typically 80,000-120,000 miles), causing coolant leaks and overheating. The water pump is often driven by… Repairs typically run $800-$1,500. Severity: medium.

What is the 2005-2023 Audi A6 Electrical Issues (Window Regulators, Door Locks, MMI)?

The Audi A6 is prone to various electrical gremlins across all generations, including window regulator failures, door lock actuator failures, MMI/infotainment glitches, and battery drain issues. Window regulators fail due to weak plastic clips in the mechanism, causing windows to… Repairs typically run $100-$2,500. Severity: low.

What is the 2018-2021 Audi A6 2018-2021 A6 Adaptive Suspension - Verify Compressor Pressure With a Physical Tester?

Audi TSB 2062932/1 describes an informational diagnostic issue on 2018-2021 A6/A7 vehicles with adaptive suspension. During PDI or diagnosis, ODIS address 0074 may show accumulator or system pressure above 25 bar even though that is not the actual pressure; some J775 suspension-c… Severity: low.

All 6 Known Issues

2019-2022 Audi A6: Gateway Control Module Liquid-Ingress Recall 90V2 (22V-861)#

2019-2025 Audi A6: 48V Belt Starter-Generator Warning and VIN-Specific Campaigns#

2005-2023 Audi A6: Electrical Issues (Window Regulators, Door Locks, MMI)#

2019-2021 Audi A6: 2019-2021 A6 3.0L Misfire Codes - Check ECM Software Before Mechanical Cleaning#

2005-2023 Audi A6: Water Pump and Thermostat Failure (Overheating)#

2018-2021 Audi A6: 2018-2021 A6 Adaptive Suspension - Verify Compressor Pressure With a Physical Tester#

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