Audi · Known Issues

2024 Audi A6 Problems: 1 Known Issue

2024 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated November 2026

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2024 Audi A6 has 1 documented issue, with 1 rated critical. The most serious is Mild-Hybrid Belt Starter-Generator Warning and VIN-Specific Campaigns. DIY maintenance guides at au7o.io.

2024 · All trims · All engines

Choose the year and equipment for your written issues and visual request.

YearTrimEngine

No email neededHow interest is saved

Interest applies to the selected vehicle and configuration; it is not a reservation. Voting stores a first-party identifier for up to 180 days to prevent repeat votes. No account or email is needed. Clearing cookies or using another device may count separately. Privacy

Visual coming soon

Your interest helps us choose what to build next.

Visual Known Issues · Coming soon

$7.99/month plus taxes at launch on January 1, 2027 · No payment today

Preview the XT6 example

All 1 Known Issue

Filter:

On the 2019-2025 Audi A6, 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, which use a 12V rather than a 48V starter generator, are covered by safety recall 27H2 or 20V-153 for moisture intrusion into the belt starter generator, which can cause a short circuit, smoldering, or fire. Audi also issued VIN-specific emissions service action 27BQ for qualifying 2019-2020 vehicles, including the A6, to replace the starter-alternator. Outside those campaigns, the exact Audi fault code and symptom number matter: U046900 with symptom 34763 and actual mode 8 can point to another CAN or sensor fault, and Audi states that replacing the starter generator will not fix that case.

Common Symptoms

48V electrical-system warning
Electrical-system malfunction message
Burning odor, smoke, or smoldering from the engine compartment on recall-affected vehicles

How to Fix

Check the VIN with Audi for open 27H2, 20V-153, or 27BQ work before authorizing parts. Follow Audi's safety instructions for an open fire-risk campaign and have the dealer perform the remedy. For a warning outside an open campaign, use Audi ODIS-guided diagnosis and preserve the complete code, symptom number, and actual mode. U046900 or P0CA700 alone is not permission to order a starter generator. Audi must select the correct starter-alternator suffix and associated hardware by VIN and guided-test result.

Find a nearby Audi dealer in Google Maps ↗

Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.

What you need to fix it

Only diagnosis- and fitment-reviewed repair parts are linked here.

Check your VIN for an open recall before buying.A dealer repairs an open manufacturer recall at no charge. Confirm coverage with NHTSA first.

48V belt starter generator and campaign hardware (VIN-specific dealer selection)
Quantity 1 only when an open campaign or Audi guided diagnosis requires replacement. The part suffix and hardware are VIN-specific; no consumer commerce link is safe.

Owner tips & cautions

TipSave a scan showing the full Audi symptom number and actual mode. U046900 by itself is not enough to select a starter generator.
WarningA conventional 12V battery, trickle charger, starter, or alternator cannot substitute for the 48V campaign remedy or guided diagnosis.

Research This Issue

Google Reddit YouTube NHTSA

NHTSA Verified

High ConfidenceVerifiedUpdated Oct 28, 2026

NHTSA Recalls14 recalls

BACK OVER PREVENTION: SENSING SYSTEM: CAMERA

Volkswagen Group of America, Inc. (Audi) is recalling certain 2019-2026 vehicles. Please see the recall report for a complete list of models. A software error may prevent the rearview camera image from displaying as intended. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 111, "Rear Visibility."

Campaign #25V90000020/12/2025

SEAT BELTS:REAR/OTHER:RETRACTOR

Volkswagen Group of America, Inc. (Audi) is recalling certain 2025 SQ6 E-Tron, SQ6 Sportback E-Tron, Q6 Sportback E-Tron, A6, A5, A6 Sportback E-Tron, Q6 E-Tron, S5, and S6 Sportback E-Tron vehicles. The automatic locking retractor may fail to engage when a child seat is installed using the seat belt. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) numbers 208, "Occupant Crash Protection" and 209, "Seat Belt Assemblies."

Campaign #25V89900020/12/2025

ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)

Volkswagen Group of America, Inc. (Audi) is recalling certain 2022 Audi A6 Sedan, A4 Sedan, Q5, and Q5 Sportback vehicles. The semiconductor inside the engine control unit may short-circuit and cause an engine stall.

Campaign #22V36800023/05/2022

EQUIPMENT:ELECTRICAL:INFOTAINMENT:VIDEO (TOUCH)SCREEN/MONITOR/UNIT

Volkswagen Group of America, Inc. (Audi) is recalling certain 2021-2022 AUDI A8, A6 Allroad, E-TRON Quattro, 2022 S3, RSQ8, RS7, RS6 Avant, Q8, Q7, Q3, E-TRON Sportback Quattro, S5 Cabriolet, E-TRON GT, S5 Sportback, A7, A6, A5 Sportback, A5 Cabriolet, A4, A4 Allroad, A3, S8, SQ7, SQ8, S6, and S4 vehicles. The infotainment main unit may become damaged internally when the vehicle is shut off, resulting in an inoperative rearview camera display the next time the vehicle is started. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 111, "Rear Visibility."

Campaign #22V80600026/10/2022

ELECTRICAL SYSTEM

Volkswagen Group of America, Inc. (Audi) is recalling certain 2020-2022 Audi S7, S6 Sedan, A6 Allroad, 2021-2022 RS7, RS6 Avant, 2019-2022 A7, and A6 Sedan vehicles. Liquid spilled in the rear seat may penetrate and cause the gateway control module to shut down.

Campaign #22V86100021/11/2022

+ 9 more recalls. Check all on NHTSA.gov

Enter your VIN at NHTSA.gov to check recalls specific to your vehicle.

🔧

A mechanic who knows YOUR exact car

Answers tuned to your year, make, model & trim — not generic advice. Save your garage so it always has the right context.

Get ahead of Audi A6 problems — free

Leave your email and we'll alert you the moment there's a new recall or known issue for your Audi A6. Free, no account needed.

Join 700+ subscribers following Au7o for vehicle insights and updates.

Don't see your problem? Describe your symptoms to get a diagnosis, or get a full repair guide.

Other Audi Models

Audi A427 Audi Q326 Audi R826 Audi S720 Audi Q718 Audi A818

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 2024 Audi A6 has 1 documented issue. The documented issue is: Mild-Hybrid Belt Starter-Generator Warning and VIN-Specific Campaigns. Of these, 1 is rated critical and should be addressed promptly.

Is the Audi A6 reliable?

The 2024 Audi A6 has 1 known issue compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 1 issue is rated critical: Mild-Hybrid 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.

What is the 2019-2025 Audi A6 Mild-Hybrid 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, which use a 12V rather than a 48V starter generator, are covered by safety recall 27H2 or 20V-153 for mo… Severity: high.

Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.