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Service bulletins for the 2021 Audi A4

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.

1057 on file from NHTSA, as of 2026-10-19.

By type

By component

By trouble code

Only bulletins with component: Electrical system are shown. Show all

Bulletins, newest first
A3921452048671_52021-12-07. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. This bulletin contains instructions for when DTC U030000 appears and “All Wheel Drive Malfunction Message” is displayed in the instrument cluster.
A9021222064983_12021-12-07. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. This bulletin states to replace the instrument cluster when there is a colorful vertical line (pixel error) in the Audi virtual cockpit.
A9121472061625_32021-12-07. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. This bulletin states to create a PSS record when the message "SOS - Emergency call malfunction, please contact service" is displayed in the instrument cluster and DTCs B129B11 and B239C11 are stored in the control module for emergency call module and communication unit.
A9021162063913_32021-11-05. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. This bulletin contains a software update for when the cluster's driver information system is blank.
SM 70-20212021-10-06. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. This special notice is to inform dealers to return the parts listed if it meets the criteria provided.
A9121312061028_32021-10-05. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. This bulletin explains and troubleshoots when Audi connect does not have a green SOS light.
A9121172062266_22021-09-03. Service bulletin. ELECTRICAL SYSTEM. This bulletin states to create a PSS record when last destinations, favorites, and home/work addresses are sporadically lost.
A9121162061257_22021-09-03. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. This bulletin contains instructions regarding Audi connect software failures and how to resolve it.
A9021112063913_22021-08-04. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT. This bulletin contains a software update for when the cluster's driver information system is blank.
A9121142053916_32021-08-04. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT. This informational bulletin contains instructions for when a non-plus sized iPhone heats up while wirelessly charging and the CarPlay screen may appear frozen.
A9121122059528_32021-08-04. Service bulletin. ELECTRICAL SYSTEM; ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. This bulletin contains ODIS instructions for DTC B200096 or B200000 with an SOS malfunction warning displayed in the instrument cluster.
A1321152061461_42021-08-04. Service bulletin. ELECTRICAL SYSTEM:ALTERNATOR/GENERATOR/REGULATOR:INTEGRATED STARTER(OTHER THAN PROPULSION); EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; ENGINE. This bulletin contains repair instructions to address noises or a message in the DIS display.
A9021092063913_12021-07-02. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; ELECTRICAL SYSTEM:SOFTWARE. This bulletin contains a software update for when the cluster's driver information system is blank.
A9121092063702_12021-07-02. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY. This bulletin states to create a PSS when the MMI display turns blue. Workaround provided.
A9121082063290_12021-07-02. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; ELECTRICAL SYSTEM. This bulletin contains instructions for troubleshooting FoD malfunctions.
A4821022061904_32021-07-02. Service bulletin. STEERING; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; ELECTRICAL SYSTEM. This bulletin contains repair instruction for when DTC C110DF0 is stored and the yellow steering lamp is on.
A4321482059665_22021-07-02. Service bulletin. SUSPENSION; ELECTRICAL SYSTEM:SOFTWARE. This bulletin contains a software update that corrects the control module configuration and addresses a warning light.
A9121052061933_22021-06-03. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; EQUIPMENT:ELECTRICAL:NAVIGATIONAL SYSTEM(GLOBAL POSITIONING SYSTEM). This bulletin contains an explanation and troubleshooting for the Navigation messages in the instrument cluster.
A1321142061461_32021-06-03. Service bulletin. ELECTRICAL SYSTEM:ALTERNATOR/GENERATOR/REGULATOR:INTEGRATED STARTER(OTHER THAN PROPULSION); POWER TRAIN:DRIVELINE:CHAIN/BELT. This bulletin contains repair instructions to address noises or a message in the DIS display.
A9121042024323_82021-06-03. Service bulletin. EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; ELECTRICAL SYSTEM:ADAS:PARKING ASSIST:SOFTWARE. This bulletin contains technical information regarding when the parking aid sporadically warns of obstacles that don't exist or it is inoperative/constant warning.
ELSAallignAudi2021-05-06. Service bulletin. ELECTRICAL SYSTEM. Elsa2Go campaign information is now 100% aligned with ElsaPro. This update to Elsa2Go ensures that both systems are displaying the same campaign information, including OPEN/CLOSED status, repair date as well as criterions at the same time without any discrepancy.
A9021982059335_22021-05-06. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; ELECTRICAL SYSTEM. This bulletin contains information on noises from the instrument cluster installation area.
A9021992063038_12021-05-06. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; ELECTRICAL SYSTEM. This informational bulletin explains why the version information pops-up.
A4321462051336_32021-05-06. Service bulletin. SUSPENSION; ELECTRICAL SYSTEM. This bulletin contains repair instructions for DTC B200FF0.
A0121042062862_12021-05-06. Service bulletin. ELECTRICAL SYSTEM. This bulletin states that if DTC P227900, P001600, and DTC P001700 recorded together in the ECM to follow the isntructions on replacing the intake manifold pressure sender.

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