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Audi · Known Issues

2025 Audi A6 Problems: 1 Known Issue

2025 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated September 2026

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Issue summary

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2025 Audi A6 has 1 documented issue, with 1 rated critical. The most serious is 48V Belt Starter-Generator Warning and VIN-Specific Campaigns. DIY maintenance guides at au7o.io.

In This Article

  • A6 Electrical1
  • Recalls14
  • FAQ
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In This Article

  • Electrical1
  • Recalls14
  • FAQ

All 1 Known Issue

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ALL YEARS2025202420232022202120202019201820172016201520142013201220112010200920082007200620052004200320022001200019991998199719961995

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 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 service action 27BQ for qualifying later vehicles. 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. Do not buy any of the former Optima, ACDelco, Battery Tender, Denso, or Remy 12V products for this 48V fault.

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Call to confirm they service Audi vehicles and check your VIN, recall eligibility, parts availability, and appointment options.

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

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NHTSA Verified
High ConfidenceVerifiedReviewed Jul 2026
NHTSA Recalls14 recalls

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 #25V89900019/12/2025

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 #25V90000019/12/2025

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.

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Other Audi Models

Audi R830Audi Q329Audi A427Audi S722Audi S419Audi S819

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 2025 Audi A6 has 1 documented issue. The documented issue is: 48V 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 2025 Audi A6 has 1 known issue compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 1 issue is rated critical: 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.

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.

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.

Data compiled from NHTSA recalls, manufacturer TSBs, automotive forums, and AI-assisted research. No aggregated owner-report counts available for this vehicle yet.

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

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