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Service bulletins for the 2021 Audi A4 allroad

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

785 on file from NHTSA, as of 2026-10-19.

By type

By component

By trouble code

Bulletins, newest first
A9123612062115_92023-02-07. Service bulletin. BACK OVER PREVENTION:DISPLAY FUNCTION. This bulletin provides instructions for when a customer states that after an over-the-air navigation map update the navigation system is permanently initializing or the navigation map is incomplete or corrupt and DTC B126CF0 and/or B126CF1 may be stored in the electronics control module.
A9123592036576_72023-02-07. Service bulletin. EQUIPMENT:ELECTRICAL:INFOTAINMENT. This bulletin advises that the MMI screen may freeze, or go blank and then restart when a special character like a symbol or emoticon is used in the name field for contact(s).
A8023122062583_22023-02-07. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM. This bulletin provides instructions for when the customer advises that there is insufficient or uneven cabin heating from the HVAC system.
A6023612063187_22023-02-07. Service bulletin. VISIBILITY:SUN/MOON ROOF ASSEMBLY. This bulletin provides instructions for when a customer reports concerns with the sunroof opening permeter seal is generating noise, dripping water, or if the seal is distorted and/or not flush with the roof panel.
A5123262068999_12023-02-07. Service bulletin. STRUCTURE. This bulletin provides instruction for when a customer advises that a visible line of corrosion is forming in the roof.
A4623402069078_12023-02-07. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This bulletin contains instructions for when the zirconium inserts found to be not firmly attached during service work.
A1323162061461_62023-02-07. Service bulletin. ENGINE AND ENGINE COOLING. This bulletin provides instructions for when there is a grinding/squeaking/tweeting noise coming from the engine compartment OR there is a message in the driver information system stating "Electrical system Malfunction! Please go to workshop". DTC P2BA300 may be stored.
DC_Alternator2023-01-06. Service bulletin. ELECTRICAL SYSTEM:ALTERNATOR/GENERATOR/REGULATOR. Support for Customers Affected by Alternator Back-order
DC_RECALLS2023-01-06. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. SAFETY RECALLS, COMPLIANCE RECALLS and STOP SALES
A5722002022032102023-01-06. Service bulletin. LATCHES/LOCKS/LINKAGES:DOORS:LOCK. This technical service bulletin provides troubleshooting information for the vehicle locking system.
A9022842064983_52023-01-06. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. This bulletin provides directions for when there is a pixel fault in the instrument cluster.
A9722892061976_32022-12-06. Service bulletin. ELECTRICAL SYSTEM:WIRING; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This bulletin contains guidance for submitting warranty wiring repairs.
A9122512062266_12022-12-06. Service bulletin. EQUIPMENT:ELECTRICAL. This bulletin advises to create a PSS record in instances where information in the MMI such as last destinations, favorites, and user defined buttons are lost.
A9122472062466_32022-12-06. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. This bulletin describes the ways in which a variety of Audi vehicles connect to Apple Wireless CarPlay, and the methods to troubleshoot connection concerns.
A9122492059528_72022-12-06. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. This bulletin provides directions when the SOS malfunction warning is displayed in the instrument cluster accompanied by DTC B200096 or DTCB200000.
A9122462065728_42022-12-06. Service bulletin. EQUIPMENT:ELECTRICAL:INFOTAINMENT. This bulletin describes an error which may arise due to a bug in the software of a customer's phone, which causes the Apple CarPlay screen to appear blank, and for audio drop-outs.
A9122452068435_12022-12-06. Service bulletin. EQUIPMENT:ELECTRICAL:INFOTAINMENT:BLUETOOTH/WIFI. This bulletin states that due to a software malfunction in Apple iOS Version 16.0.x there are restrictions with bluetooth connection.
A9122422065817_22022-12-06. Service bulletin. EQUIPMENT:ELECTRICAL. This bulletin provides troubleshooting tips for logging in to Audi Connect and Key User Pairing
A3922492059057_52022-12-06. Service bulletin. WHEELS. This bulletin contains repair instructions for noises when in reverse or vibrations/humming/droning or rubbing when fully turning the wheel.
A3422602067653_22022-12-06. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides instructions to address DTCs P071800, P276800, P071800, and P276800.
A9722882068037_22022-11-04. Service bulletin. EQUIPMENT:ELECTRICAL. This bulletin provides instructions on how to address DTC U014000, or DTC U110100.
A9122402065728_32022-11-04. Service bulletin. EQUIPMENT:ELECTRICAL:INFOTAINMENT. This bulletin describes an error which may arise due to a bug in the software of a customer's phone, which causes the Apple CarPlay screen to appear blank, and for audio drop-outs.
A9122392062115_82022-11-04. Service bulletin. LANE DEPARTURE:LANE KEEP:NAVIGATION SYSTEM/SOFTWARE; EQUIPMENT:ELECTRICAL:NAVIGATIONAL SYSTEM(GLOBAL POSITIONING SYSTEM). This bulletin contains instructions for when the nav files are corrupted during an update.
A2022502061461_52022-11-04. Service bulletin. ENGINE AND ENGINE COOLING. This bulletin advises on the repair recommendation for a squeaking, grinding, or tweeting noise coming from the engine compartment. DTC P2BA300 may be stored.
A9622792061932_52022-10-05. Service bulletin. EQUIPMENT:ELECTRICAL. This bulletin provides information on how to properly address DTC U112300.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.