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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

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

Bulletins, newest first
A2723612067906_42023-11-06. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY. This bulletin provides information for when DTC P0A7D00 is stored.
A0123812028842_42023-11-06. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides instructions regarding unauthorized chip tuning (TD1).
A0023782066297_42023-11-06. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. This bulletin provides information related to the VIN-4-PIN Program.
A0023762071721_12023-11-06. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. This bulletin provides information for when unauthorized/unjustified DTC memory entries are captured in ODIS test Plans (Ghost faults).
A9123252062115102023-09-01. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. This bulletin contains instructions to reinstall the navigation database in the presence of DTC B126CF1 stored in the 005F.
A9123222061028_52023-09-01. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. This bulletin provides information for when there are no Audi connect services in the MMI, and the SOS LED does not turn green after PDI.
A9123202065817_32023-09-01. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. This bulletin provides information for when the key user pairing process or myAudi login cannot be completed in the vehicle.
A9023382071281_12023-09-01. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; ELECTRICAL SYSTEM. This bulletin provides information for when the warning "Fault: Limited warning messages" appears in the instrument cluster with DTC B174404.
A9023352063913_62023-09-01. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; ELECTRICAL SYSTEM. This bulletin provides information for when the driver information system display is blank in the instrument cluster.
A0123692071199_22023-09-01. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. This bulletin provides information for when the MIL is on and P045600 is stored.
A9023322059335_42023-08-04. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. This bulletin provides information for when there is noise from the area around the instrument cluster.
A9023332063913_52023-08-04. Service bulletin. ELECTRICAL SYSTEM; ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. This bulletin provides information for when the instrument cluster driver information system display is blank.
A5323082063913_52023-08-04. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; ELECTRICAL SYSTEM. This bulletin provides information for when the instrument cluster driver information system display is blank.
A9123072064681_32023-07-10. Service bulletin. EQUIPMENT:ELECTRICAL:INFOTAINMENT; EQUIPMENT:ELECTRICAL:INFOTAINMENT:SOFTWARE; ELECTRICAL SYSTEM:SOFTWARE. This bulletin provides information for when wireless charging with the Audi Phone Box does not work.
A9123982069112_32023-07-10. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT; EQUIPMENT:ELECTRICAL:INFOTAINMENT. This bulletin provides a software update for instances where saved addresses (including the home address), favorites, last destinations, and/or icon and shortcut order are lost sporadically, the MMI screen turns blue, or becomes stuck on the welcome screen.
A9123052068573_22023-07-10. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM:ADAS:PARKING ASSIST:SENSORS. This bulletin provides information for when the parking aid sensor bracket(s) separate from the rear bumper.
A9123022061257_32023-07-10. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. This bulletin provides information for when the message "Audi connect installation: error during installation" is shown in the drop down menu of the MMI.
A9123002070573_12023-07-10. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. This bulletin provides a software update for instances where the integrated toll module settings can no longer be accessed via the MMI, or the Audi smartphone interface can only be used wired. No relevant DTCs have been stored, and 91DZ has been performed.
A9023282070020_22023-07-10. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; EQUIPMENT. This bulletin provides information for when semi circular marks appear on the edges of the virtual cockpit display.
A5723082027406_52023-07-10. Service bulletin. ELECTRICAL SYSTEM:IGNITION:ANTI-THEFT:IMMOBILIZER/PROXIMITY:KEY/SENDER. This bulletin provides information regarding the Audi advanced key.
A2723562069747_32023-07-10. Service bulletin. ELECTRICAL SYSTEM. This bulletin provides additional diagnostic instructions for when the vehicle does not start due to a drained 12v battery (A).
A9123952067843_22023-06-06. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. This bulletin provides instructions to disable the configuration wizard.
A7223462069350_12023-06-06. Service bulletin. ELECTRICAL SYSTEM; SEATS. This bulletin provides information for when the starter battery is discharged, and the vehicle cannot be started due to the front adjustment seat switch becoming jammed.
A4323742059665_52023-06-06. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. This bulletin provides an SVM update for when the warning light for the suspension appears in the instrument cluster, and the SVM registers an unknown event when carrying out "Check control unit configuration" and cannot be automatically parameterized.
A4323732051336_72023-06-06. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. This bulletin advises that if the warning lamp for the damper control in the instrument cluster is on, and DTC B200FF0 is stored to delete the DTC and perform suspension basic settings.

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