NHTSA ID Number: 11012543
Manufacturer Communication Number: Circular 27BQ_REV9
TSB/Document Date: 2025-01-07
Summary
Under this service action, Audi dealers will replace the starter-alternator in affected vehicles at no cost to owners. A defective starter-alternator may inhibit start/stop functionality which could increase CO2 and other emissions while the vehicle is stopped. Emissions still remain within certification standards. Updated affected vehicle chart, owner notification letters, parts and claiming sections to reflect the addition of the final wave of vehicles. Updated criteria in parts section.
Emissions Service Action
Code: 27BQ
Subject
Document History
Affected Vehicles
Starter - Alternator
Date
Summary
12/17/2024
Updated criteria in parts section.
12/06/2024
Updated affected vehicle chart, owner notification letters, parts and
claiming sections to reflect the addition of the final wave of vehicles.
Updated work instructions (battery charger must be connected
before checking starter/generator software version).
11/15/2024
Updated affected vehicle chart & owner notification letters to reflect
the addition of the next wave of vehicles.
10/24/2024
Updated parts table in parts section.
10/10/2024
Updated affected vehicle chart & owner notification letters to reflect
the addition of 2022 model year.
08/19/2024
Updated affected vehicle chart & owner notification letters to reflect
the addition of 2021 model year.
Parts and claiming instructions updated.
06/26/2024
Updated parts sections, claiming and work instructions.
06/11/2024
Updated coolant claiming quantity.
05/03/2024
Updated claiming instructions.
04/30/2024
Original publication.
Country
Beginning
Model
Year
Ending
Model
Year
Vehicle
USA
2020
2024
A6 ALLROAD
USA
2019
2024
A6 SEDAN
USA
2019
2024
A7
USA
2019
2024
A8
USA
2020
2024
Q7
USA
2019
2024
Q8
USA
2021
2024
RS6 AVANT
USA
2021
2024
RS7
USA
2020
2024
RSQ8
USA
2020
2024
S6 SEDAN
USA
2020
2024
S7
USA
2020
2024
S8
CAN
2020
2024
A6 ALLROAD
CAN
2019
2024
A6 SEDAN
CAN
2019
2024
A7
CAN
2019
2024
A8
Vehicle
Count
The 27BQ
repair will
be launched
in multiple
waves.
The 27BQ
repair will
be launched
The repair information in this document is intended for use only by skilled technicians who have the proper tools, equipment and training to correctly and safely maintain your vehicle. These
procedures are not intended to be attempted by “do-it-yourselfers,” and you should not assume this document applies to your vehicle, or that your vehicle has the condition described. To
determine whether this information applies, contact an authorized Audi dealer. 2024 Audi of America, Inc. and Audi
Canada. All Rights Reserved.
27BQ Page 1 of 28
About this Emissions
Service Action
Code Visibility and
Owner Notification
CAN
2020
2024
Q7
CAN
2019
2024
Q8
CAN
2021
2024
RS6 AVANT
CAN
2021
2024
RS7
CAN
2020
2024
RSQ8
CAN
2020
2024
S6 SEDAN
CAN
2020
2024
S7
CAN
2020
2024
S8
in multiple
waves.
Under this service action, Audi dealers will replace the starter-alternator in affected vehicles at
no cost to owners. A defective starter-alternator may inhibit start/stop functionality which could
increase CO2 and other emissions while the vehicle is stopped. Emissions still remain within
certification standards.
WAVE
CRITERIA
VISIBILITY/LAUNCH
DATE
CUSTOMER MAILING
DATE
1
C8, A8, 4M, SC, S8, RQ
April 30, 2024
May 2024
2
21, 22, 23, 24, 25, 26, 27
August 19, 2024
August 2024
3
31, 32, 33, 34, 35, 36, 37
October 10, 2024
October 2024
4
41, 42, 43, 44, 45, 46, 47
November 15, 2024
November 2024
5
51, 52, 53, 54, 55, 56, 57
December 06, 2024
December 2024
Emissions Campaigns
Requirements
(CALIFORNIA ONLY)
The California Air Resources Board and the Department of Motor Vehicles (DMV) require
emissions-related campaigns to be completed prior to vehicle registration renewal. When
campaign work is done you must provide the owner with a signed “Vehicle Emission Recall –
Proof of Correction” certificate (RC EMISCAVWAU). Order certificates online via the
Compliance Label Ordering portal at www.accessaudi.com.
Additional Information
Please alert everyone in your dealership about this action, including Sales, Service, Parts
and Accounting personnel. Contact Warranty if you have any questions.
Dealers must ensure that every affected inventory vehicle has this campaign completed before
delivery to consumers.
The information in this document is intended for use only by skilled technicians who have the proper tools, equipment and training to correctly and safely maintain your vehicle. These procedures
are not intended to be attempted by “do-it-yourselfers,” and you should not assume this document applies to your vehicle, or that your vehicle has the condition described. To determine whether
this information applies, contact an authorized Audi dealer. 2024 Audi Group of America, Inc. and Audi Canada. All Rights Reserved.
27BQ Page 2 of 28
Parts Information
Criteria
Quantity
Part Number
P.O.C. Part Description
SC, 24, 34, 44, 54
1
4N0-903-028-S
C8, A8, 4M, S8
21, 22, 23, 25
31, 32, 33, 35
41, 42, 43, 45
51, 52, 53, 55
1
4N1-903-028
RQ, RS
26, 27
36, 37
46, 47
56, 57
1
4N1-903-028-B
Alternator
ALL
1
N -900-970-01
ALL
2
N -910-718-01
BOLT (if necessary)
C8, A8, 4M, SC
21, 22, 23, 24
31, 32, 33, 34
41, 42, 43, 44
51, 52, 53, 54
1
06M-121-488-A
GASKET
C8, 21, 31, 41, 51
1
06M-133-237-A
GASKET
4M, 23, 33, 43, 53
1
4M0-145-117
SEAL RING
RS, 26, 36, 46, 56
1
N -910-191-01
SEAL RING
S8, RS, RQ
25, 26, 27
35, 36, 37
45, 46, 47
55, 56, 57
4
N -910-968-01
S8, RS, RQ
25, 26, 27
35, 36, 37
45, 46, 47
55, 56, 57
1
WHT-008-729-A
SEAL RING
G -12E-100-1G CON
G12 EVO Coolant - Concentrate
(US Dealers)
G -12E-100-2G CON
G12 EVO Coolant - Concentrate
(Canadian Dealers)
G -12E-050-1G-RTU
G12 EVO Coolant - 50/50 Pre-mix
(US Dealers)
G -12E-050-2G-RTU
G12 EVO Coolant - 50/50 Pre-mix
(Canadian Dealers)
As needed
ALL
Ordering Method
Reference POC
comments
individually by part
number, or in the
POC Campaign
List
-OR-
As needed
NOTE: Approximately 3 liters of coolant should be needed for the repair.
The information in this document is intended for use only by skilled technicians who have the proper tools, equipment and training to correctly and safely maintain your vehicle. These procedures
are not intended to be attempted by “do-it-yourselfers,” and you should not assume this document applies to your vehicle, or that your vehicle has the condition described. To determine whether
this information applies, contact an authorized Audi dealer. 2024 Audi Group of America, Inc. and Audi Canada. All Rights Reserved.
27BQ Page 3 of 28
Initial Allocation:
NO
There will be no parts allocation.
NOTE
Your dealer’s Estimated Remaining Repairs by campaign can be found in Parts on Command.
Click on “View Campaign List” and review the Estimated Remaining Repairs column.
NOTE
Campaign parts should always be ordered as per the parts information in this circular. The ordering system will
supersede the part, if applicable.
The information in this document is intended for use only by skilled technicians who have the proper tools, equipment and training to correctly and safely maintain your vehicle. These procedures
are not intended to be attempted by “do-it-yourselfers,” and you should not assume this document applies to your vehicle, or that your vehicle has the condition described. To determine whether
this information applies, contact an authorized Audi dealer. 2024 Audi Group of America, Inc. and Audi Canada. All Rights Reserved.
27BQ Page 4 of 28
- High-performance wireless diagnostic workstation - Upgrade...
- Newest in Innovation Full System Diagnostic - CR MAX P auto...
- Up to 50 Reset Services Performs - Equipped with 50 hot...
- Powerful Bi-directional Control - This scanner can send...
- Dynamic Graphing Convenient - All system diagnostic datas...
If the PDF is very large, it may not load in the preview below.
Some older TSBs had multiple PDFs — visit the NHTSA Website to view all PDFs.
If the TSB PDF does not show, download or view it on the NHTSA Website.
Click on the (+) Plus Sign
Then Click on Associated Document(s)
Search NHTSA Database for Recalls
Search NHTSA Database for Vehicle Investigations
View Latest Vehicle Investigations
Search NHTSA Database for Vehicle Complaints
View Latest Vehicle Complaints
TSB/Document ID: Circular 27BQ_REV9
Replacement Service Bulletin Number:
MFR Communication Date: 2024-12-17
MFR Internal Campaign ID/Software Version: 27BQ
Communication Type: Service Campaign
NHTSA Components: UNKNOWN OR OTHER
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
- [Notice] When you receive a used device, it may be a customer return resold by Amazon without inspection. You can exchange it for a new one through Amazon. As this situation is unavoidable, we sincerely apologize. For any issues, contacting us via Amazon's "Messages" is the best way. THINKSCAN 689BT Bidirectional Scan Tool Can Be Used Immediately After It is Turned On, Without Complicated Registration Process, Which is More Convenient & Quick.
- Full Bi-Directional Control & 3000+ Active Tests: Take control and test components like actuators, fuel injectors, relays, and cooling fans in real time. You’ll quickly see if the problem is in the part itself or the control module — saving you hours of guesswork and frustrating trial-and-error.
- Advanced ECU Coding Capabilities: Handle module matching and hidden feature activation with confidence. When you replace an ECU or want to customize settings, this obd2 scanner diagnostic bi directional tool gives you the professional-level capabilities you need without the dealership price tag.
- 34+ Useful Reset and Maintenance Functions: Complete everyday service tasks smoothly with a wide range of helpful reset and maintenance functions. Whether you’re keeping up with regular upkeep or tackling a specific job, this scanner makes maintenance simpler and less stressful for both DIYers and pros.
- Comprehensive Full System Diagnostics: Diagnose every major system — Engine, Transmission, ABS, SRS, TPMS, and more — all in one place. Finally stop wondering if you’re missing something important; get the full picture and clear codes with ease.
- Top Reasons to Choose the D7S OBD2 Scanner: XTOOL D7S car scan tool, an upgrade of XTOOL D7, offers comprehensive features for automotive technicians, workshops, and DIY enthusiasts 1. Upgraded Hardware: 2+64GB memory, rear camera, intuitive interface, foldable bracket 2. Complete Diagnostics: FCA
Autoauth, OE-level all system scan, 39+ maintenance services, 4K+ bidirectional, CANFD/DoIP protocol 3. Advanced Capabilities: ECU coding, PMI functions 4. Wide Compatibility: Support 10,000+ models, covering 99% vehicle brands 5. Multi-language: Available in 22+ languages, No IP Restrictions 6. 3-Year Updates: Save 300 bucks on software updates for the latest features and optimizations - 2026 Upgraded D7S Car Scanner Features: The newly 2026 D7S V2.0 scanner for car brings exciting features for advanced vehicle diagnostics and enhanced user experience 1. FCA AutoAuth: Now supports FCA SGW module for Chrysler, for Jeep, for Dodge (2018+), for Fiat (2017+), enabling faster vehicle communication without gateway restrictions 2. PMI (Offline ECU Programming): Allows for Ford, for Lincoln, and for Mazda ECU programming for new modules 3. Optimized Diagnostic Report 2.0: Personalized reports with logos and customer info for auto shops. Note: Compatibility varies by cars, please check before order
- Cost-effective ECU Coding Scan Tool for Specific Brands: Enhance your vehicle's performance with XTOOL D7S! This obd2 scanner all systems bidirectional offers advanced capabilities at an affordable price, supports online for BMW, for Benz and offline for BENZ, for MIT, along with PMI functions for Ford, for Mazda, and for Lincoln. Ideal for technicians and DIY enthusiasts, this automotive scanner diagnostic tool optimizes vehicle performance and enhances the driving experience. Note: Not for all cars and modules, please send car VIN to check the compatibility before purchase
- OE All System Diagnostic & 8 Pids Graphing: XTOOL D7S is a comprehensive all system bi directional obd2 scanner that delivers dealer-level diagnostics, completely controlling over your vehicle’s performance and health. This automotive scan tool can read and clear DTCs, view live data and ECU information, retrieve freeze frames, and perform active tests and full obd2 functions. This bi-directional scan tool can can identify your vehicle's make, model, and year information with just one click and show up to 8 PIDs live data with options for CSV viewing, playback, and recording for in-depth analysis. It is easy-to-use for both professionals and beginners, helping pinpoint issues efficiently
- 3 Years Software Update, Value for Money: With 3 years of software updates and 22+ languages(no IP restrictions), XTOOL D7S auto scanner code scanner ensures ongoing compatibility for the latest car models and improved diagnostic functions. This all system vehicle diagnostic scanner comes with a 30-day return policy and a 24-month repair for dependable performance. XTOOL are dedicated to your satisfaction, so enjoy seamless support and lifetime expert assistance. Should you encounter any issues or concerns, don’t hesitate to reach out XTOOL. D7S with newest update with 22 languages freely transfer without authorization, check details from setting-language or from XTOOL
- 🔥 Historical lowest pr-ice now on sa-le--hot se-lling.
- 【🎈𝗜𝗙𝟳𝟰𝟱 𝗽𝗲𝗿𝗳𝗼𝗿𝗺𝘀 𝟲 𝗲𝘀𝘀𝗲𝗻𝘁𝗶𝗮𝗹 𝗿𝗲𝘀𝗲𝘁 𝗳𝘂𝗻𝗰𝘁𝗶𝗼𝗻𝘀—𝗔𝗕𝗦 𝗕𝗹𝗲𝗲𝗱𝗶𝗻𝗴, 𝗢𝗶𝗹 𝗥𝗲𝘀𝗲𝘁, 𝗘𝗣𝗕, 𝗦𝗔𝗦, 𝗧𝗵𝗿𝗼𝘁𝘁𝗹𝗲 𝗥𝗲𝗹𝗲𝗮𝗿𝗻, 𝗮𝗻𝗱 𝗕𝗠𝗦—𝗽𝘂𝘁𝘁𝗶𝗻𝗴 𝗽𝗿𝗼𝗳𝗲𝘀𝘀𝗶𝗼𝗻𝗮𝗹-𝗴𝗿𝗮𝗱𝗲 𝗺𝗮𝗶𝗻𝘁𝗲𝗻𝗮𝗻𝗰𝗲 𝗯𝗮𝗰𝗸 𝗶𝗻 𝘆𝗼𝘂𝗿 𝗵𝗮𝗻𝗱𝘀.】Spongy brakes? Stuck oil light? Parking brake won't release? Off-center steering? Rough idle after battery disconnect? Draining battery? IF745 handles all with a few taps. One tool covers six dealer-level resets, saving hundreds in labor costs. ❗ NOTE: Does NOT support bidirectional control, coding, or programming.
- 【✨ 𝗜𝗙𝟳𝟰𝟱 𝗴𝗼𝗲𝘀 𝗯𝗲𝘆𝗼𝗻𝗱 𝗯𝗮𝘀𝗶𝗰 𝗰𝗼𝗱𝗲 𝗿𝗲𝗮𝗱𝗶𝗻𝗴 𝘄𝗶𝘁𝗵 𝟭𝟬 𝗶𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗲𝗱 𝗳𝘂𝗻𝗰𝘁𝗶𝗼𝗻𝘀—𝗗𝗧𝗖 𝗟𝗼𝗼𝗸𝘂𝗽, 𝗜/𝗠 𝗥𝗲𝗮𝗱𝗶𝗻𝗲𝘀𝘀, 𝗙𝗿𝗲𝗲𝘇𝗲 𝗙𝗿𝗮𝗺𝗲, 𝗟𝗶𝘃𝗲 𝗗𝗮𝘁𝗮, 𝗢𝟮𝗦, 𝗢𝗕𝗠, 𝗘𝗩𝗔𝗣, 𝗮𝗻𝗱 𝗺𝗼𝗿𝗲. 】Pulling a code tells you something is wrong. IF745 tells you what the code means, when the fault happened, and what data surrounds it. Pass emissions with one I/M Readiness tap. Freeze the fault moment with Freeze Frame. Monitor live sensor data in real time. Turn cryptic codes into clear answers.
- 【🛒 𝗜𝗙𝟳𝟰𝟱 𝗽𝗲𝗿𝗳𝗼𝗿𝗺𝘀 𝗳𝘂𝗹𝗹-𝘀𝘆𝘀𝘁𝗲𝗺 𝗱𝗶𝗮𝗴𝗻𝗼𝘀𝘁𝗶𝗰𝘀 𝗮𝗰𝗿𝗼𝘀𝘀 𝗮𝗹𝗹 𝗺𝗼𝗱𝘂𝗹𝗲𝘀—𝗲𝗻𝗴𝗶𝗻𝗲, 𝗔𝗕𝗦, 𝗮𝗶𝗿𝗯𝗮𝗴, 𝘁𝗿𝗮𝗻𝘀𝗺𝗶𝘀𝘀𝗶𝗼𝗻, 𝘀𝘁𝗲𝗲𝗿𝗶𝗻𝗴, 𝘀𝘂𝘀𝗽𝗲𝗻𝘀𝗶𝗼𝗻, 𝗯𝗼𝗱𝘆 𝗲𝗹𝗲𝗰𝘁𝗿𝗼𝗻𝗶𝗰𝘀, 𝗮𝗻𝗱 𝗺𝗼𝗿𝗲. 】Warning lights on but you don't know why? Skip the $100+ diagnostic fee at the shop. Run a complete self-check from your driveway. IF745 reads and clears fault codes, retrieves ECU info, and displays live data from every accessible module—delivering a full vehicle health report in minutes, without leaving home.
- 【✅𝗜𝗙𝟳𝟰𝟱 𝗳𝗲𝗮𝘁𝘂𝗿𝗲𝘀 𝗮 𝟳-𝗶𝗻𝗰𝗵 𝗱𝗶𝘀𝗽𝗹𝗮𝘆, 𝗲𝗿𝗴𝗼𝗻𝗼𝗺𝗶𝗰 𝗱𝗲𝘀𝗶𝗴𝗻, 𝗪𝗶-𝗙𝗶 𝘂𝗽𝗱𝗮𝘁𝗲𝘀, 𝗮𝗻𝗱 𝘇𝗲𝗿𝗼 𝘀𝘂𝗯𝘀𝗰𝗿𝗶𝗽𝘁𝗶𝗼𝗻 𝗳𝗲𝗲𝘀 𝗳𝗼𝗿 𝗵𝗮𝘀𝘀𝗹𝗲-𝗳𝗿𝗲𝗲 𝗱𝗶𝗮𝗴𝗻𝗼𝘀𝘁𝗶𝗰𝘀.】Large screen means no squinting. Intuitive navigation and customizable data displays put key info at your fingertips. Wi-Fi delivers lifetime free updates without a computer. No recurring fees. No hidden costs. Just a reliable tool that works as hard as you do.
This product presentation was made with AAWP plugin.