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 2005-2011 Audi A6 Timing Chain Tensioner Failure (3.2L V6 & 4.2L V8)?

The C6 A6 with the 3.2L V6 and 4.2L V8 engines suffers from timing chain tensioner failures due to wear over time. Audi designates the chains and tensioners as "lifetime" parts requiring no maintenance, but they fail as early as 80,000-120,000 miles. The 3.2L engine has 4 chains,… Repairs typically run $3,000-$12,000. Severity: high.

What is the 1995-1999 Audi A6 Timing belt/tensioner failure causes catastrophic valve-piston contact?

The 2.8L V6 (both 12V AAH in the C4 1995-1997 and 30V AHA/ATQ in the C5 starting 1998) is an interference engine, so timing belt, tensioner, idler, or hydraulic damper failure between service intervals will allow the valves to strike the pistons, bending valves and sometimes crac… Repairs typically run $900-$4,500. Severity: high.

What is the 2000-2002 Audi A6 C5 A6 2.7T Low Boost or Smoke - Diagnose the System Before Buying a Turbo?

The 2000-2002 C5 A6 Quattro 2.7T APB uses two position-specific turbochargers plus wastegate control, N75 regulation, recirculation valves, vacuum plumbing, charge-air hoses/intercoolers, crankcase ventilation, and separate oil/coolant connections. Low boost, noise, or exhaust sm… Severity: high.

What is the 1998-2004 Audi A6 Headlight-Switch Wiring Fire Recalls JC and JN?

Audi recall 04V-133 (campaign JC) covers certain 1998-2004 A6 and S6 vehicles because the headlight-switch wiring harness can contact the driver's-side crossmember area, eventually shorting and creating a fire risk in the left dashboard. Audi later issued recall 06V-198 (campaign… Repairs typically run $0-$0. Severity: high.

What is the 1998-1999 Audi A6 Tie-Rod Seal Failure Recalls 99V-248 and 00V-414?

Certain 1998-1999 Audi A6 vehicles were included in safety recalls 99V-248 and 00V-414 for tie rods whose seals might not keep moisture and dust out of the swivel-bearing mechanism. Contamination can accelerate wear and create excessive play, reducing steering control. Clunking,… Repairs typically run $0-$0. Severity: high.

What is the 2012-2015 Audi A6 2012-2015 A6 ABS/ESP Warning With Engine Will Not Switch Off?

Audi TSB 2037761/1 covers a specific situation in which a 2012-2015 A6 shows ABS/ESP warnings and the engine does not switch off with a normal press of START ENGINE STOP. The ignition system uses the ABS control unit's vehicle-speed signal to determine whether the car is stationa… Severity: medium.

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 1998-2004 Audi A6 C5 Sunroof and Fresh-Air Plenum Drain Water Ingress?

The federal Dewey settlement record identifies 1998-2005 Audi A6 C5 vehicles with the 4B platform code, including allroad, S, and RS versions, among vehicles alleged to be susceptible to passenger-compartment water ingress through sunroof drains or the fresh-air plenum. This page… Severity: medium.

What is the 2019 Audi A6 2019 MIB2+ Lower MMI/HVAC Display Distortion or Flicker?

Audi TSB 2053875/1 applies to 2019 A6 vehicles equipped with MIB2+. The documented condition is a flickering lower MMI/HVAC display or streaked colored horizontal lines. Audi attributes it to a hardware problem in the upper MMI screen that corrupts image data sent to the lower di… 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 1998-2001 Audi A6 C5 A6 2.8L Rear-Engine Coolant Leak - Locate the Connection First?

Audi repair literature for the C5 2.8L AHA engine identifies a rear coolant pipe and multiple sealed cooling-system connections. Owner reports on 2.8L AHA/ATQ cars also show why a leak at the rear of the engine cannot be assigned to one O-ring from symptoms alone: coolant can esc… Severity: medium.

What is the 2000-2004 Audi A6 Front Suspension Multi-Link Control Arm and Tie-Rod Wear Causing Clunks and Tire Wear?

The C5 A6 uses a multi-link aluminum front suspension with multiple upper and lower control arms whose ball joints and bushings commonly wear out, especially on rough roads or higher-mileage cars. Owners frequently report front-end clunking over bumps, wandering steering, vibrati… Repairs typically run $600-$1,800. Severity: medium.

What is the 2000-2004 Audi A6 2.7T Ignition Coil Pack Failure Causing Misfires and Flashing Check Engine Light?

The 2.7T V6 used in A6 2.7T models is well known for ignition coil pack failures that cause sudden misfires, rough running, and loss of power. This issue was widespread across many early-2000s Audi/VW turbo models and generated numerous owner complaints and service actions. Failu… Repairs typically run $120-$500. Severity: medium.

What is the 2021-2022 Audi A6 2021-2022 A6 Virtual Cockpit Continuous Colored Pixel Line?

Audi TSB 2064983/1 covers 2021-2022 A6 models equipped with Audi Virtual Cockpit Gen2+. A red, green, or blue continuous vertical line can appear through the instrument-cluster display; Audi identifies this as a hardware issue in the Virtual Cockpit. This is distinct from the old… Severity: low.

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.

Audi · Known Issues

1995-2025 Audi A6 Problems: 23 Known Issues

1995-2025 model years · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated August 2026

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According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 1995-2025 Audi A6 has 23 documented known issues, with 9 rated critical. The most serious are Gateway Control Module Liquid-Ingress Recall 90V2 (22V-861) ($0-$0 repair), 48V Belt Starter-Generator Warning and VIN-Specific Campaigns, Timing Chain Tensioner Failure (3.2L V6 & 4.2L V8) ($3,000-$12,000 repair), Timing belt/tensioner failure causes catastrophic valve-piston contact ($900-$4,500 repair), C5 A6 2.7T Low Boost or Smoke - Diagnose the System Before Buying a Turbo, Headlight-Switch Wiring Fire Recalls JC and JN ($0-$0 repair), Tie-Rod Seal Failure Recalls 99V-248 and 00V-414 ($0-$0 repair), 2006 A6 Multitronic 01J Delayed D/R Engagement - Check the Axial-Seal TSB and C5 A6 Bosch 5.3 ABS Warning or No Communication - Identify and Test Before Module Work. Across all issues with published estimates, repair costs range from $100 to $12,000. at .

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 1995-2025 Audi A6 has 23 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, Timing Chain Tensioner Failure (3.2L V6 & 4.2L V8). Of these, 9 are rated critical and should be addressed promptly.

Is the Audi A6 reliable?

The 1995-2025 Audi A6 has 23 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 9 issues are rated critical: Gateway Control Module Liquid-Ingress Recall 90V2 (22V-861) and 48V Belt Starter-Generator Warning and VIN-Specific Campaigns and Timing Chain Tensioner Failure (3.2L V6 & 4.2L V8) and Timing belt/tensioner failure causes catastrophic valve-piston contact and C5 A6 2.7T Low Boost or Smoke - Diagnose the System Before Buying a Turbo and Headlight-Switch Wiring Fire Recalls JC and JN and Tie-Rod Seal Failure Recalls 99V-248 and 00V-414 and 2006 A6 Multitronic 01J Delayed D/R Engagement - Check the Axial-Seal TSB and C5 A6 Bosch 5.3 ABS Warning or No Communication - Identify and Test Before Module Work. 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 $12,000, 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 year Audi A6 is the most reliable?

Reliability varies across model years of the Audi A6. Based on documented issues, problems are most commonly reported in earlier model years. Au7o recommends checking the specific known issues for your target year before purchasing, and having a pre-purchase inspection performed by a qualified mechanic. Our known issues database covers the 1995-2025 Audi A6 with 23 documented issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports.

All 23 Known Issues

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Frequently Asked Questions

What are the most common Audi A6 problems?

Is the Audi A6 reliable?

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

What year Audi A6 is the most reliable?

When Issues Typically Appear

Gateway Control Module Liquid-Ingress Recall 90V2 (22V-861)#

48V Belt Starter-Generator Warning and VIN-Specific Campaigns#

Headlight-Switch Wiring Fire Recalls JC and JN#

2019 MIB2+ Lower MMI/HVAC Display Distortion or Flicker#

2021-2022 A6 Virtual Cockpit Continuous Colored Pixel Line#

Electrical Issues (Window Regulators, Door Locks, MMI)#

C5 A6 Center Driver-Information Display Pixel Loss#

Timing Chain Tensioner Failure (3.2L V6 & 4.2L V8)#

Timing belt/tensioner failure causes catastrophic valve-piston contact#

C5 A6 2.7T Low Boost or Smoke - Diagnose the System Before Buying a Turbo#

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

Water Pump and Thermostat Failure (Overheating)#

2.7T Ignition Coil Pack Failure Causing Misfires and Flashing Check Engine Light#

Supercharger Clutch Engagement Noise vs Pulley Fault — CREC 3.0T#

C5 A6 Bosch 5.3 ABS Warning or No Communication - Identify and Test Before Module Work#

2012-2015 A6 ABS/ESP Warning With Engine Will Not Switch Off#

Tie-Rod Seal Failure Recalls 99V-248 and 00V-414#

2006 A6 Multitronic 01J Delayed D/R Engagement - Check the Axial-Seal TSB#

Front Suspension Multi-Link Control Arm and Tie-Rod Wear Causing Clunks and Tire Wear#

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

C5 Sunroof and Fresh-Air Plenum Drain Water Ingress#

C5 A6 2.8L Rear-Engine Coolant Leak - Locate the Connection First#

Crankcase Pressure-Regulating Valve Service Action 17F9 (2.0T)#