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: Transmission and driveline are shown. Show all
| A3924702059057_11 | 2024-09-06. Service bulletin. POWER TRAIN. This bulletin provides informatin when there is binding or vibrations in tight turns with quattro Ultra. |
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| A3724222074826_1 | 2024-09-06. Service bulletin. POWER TRAIN. This bulletin offers information about the basic information needed for technical requests for gaerbox complaints. |
| A4824682028220_11 | 2024-08-06. Service bulletin. POWER TRAIN. This bulletin provides information when there is visual damage on the steering wheel. |
| A3924652059057_10 | 2024-08-06. Service bulletin. POWER TRAIN. This bulletin provides informatino when there are vibrations or binding in tight turns with quattro Ultra. |
| A3924642074618_1 | 2024-08-06. Service bulletin. POWER TRAIN. This bulletin provides information when there are vibration or binding in tight turns with quattro Ultra. |
| A3924632059057_9 | 2024-08-06. Service bulletin. POWER TRAIN. This bulletin provides information when there are vibrations or binding in tight turns. |
| A3724192074766_2 | 2024-08-06. Service bulletin. POWER TRAIN. This bulletin provides information when tehre are homing noises when cornering; 0CK gearbox. |
| A3724142074751_1 | 2024-08-06. Service bulletin. POWER TRAIN. This bulletin provides information about replacing the clutch end cover. |
| A3724132074750_1 | 2024-08-06. Service bulletin. POWER TRAIN. This bulletin provides information about replacing the clutch end cover. |
| A3424692067653_8 | 2024-08-06. Service bulletin. POWER TRAIN. This bulletin provides information when there is function restriction with event memory P071800 - P276800. |
| A2424622074811_1 | 2024-08-06. Service bulletin. POWER TRAIN. This bulletin provides infomration when the Engine: coasting function not available - 4-cyl. 2.0 ltr. TFSI mild hybrid. |
| A2424612074810_1 | 2024-08-06. Service bulletin. POWER TRAIN. This bulletin provides information when there is a fault shown; Engine: start/stop system, and the start system is not working; mileage below 50 km/32 miles. |
| A3424682067653_7 | 2024-07-02. Service bulletin. POWER TRAIN. This bulletin provides information when there is function restriction with event memory entry P071800 - P276800 (symptom 20736 - 20737). |
| A3424682067653_7 | 2024-07-02. Service bulletin. POWER TRAIN. This bulletin provides information when there is function restriction with event memory entry P071800 - P276800 (symptom 20736 - 20737). |
| A3924602059057_8 | 2024-05-06. Service bulletin. POWER TRAIN. This bulletin provides information when there is binding or vibrations in tight turns in vehicles equipped with quattro Ultra. |
| A3924582059057_7 | 2024-03-06. Service bulletin. POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE). This bulletin provides information when quattro Ultra has vibrations or binding in tight turns. |
| A3424672067653_6 | 2024-02-06. Service bulletin. POWER TRAIN; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). This bulletin provides information when there is function restriction with event memory P071800 - P276800 (symptom 20736-20737). |
| A1524462072713_1 | 2024-02-06. Service bulletin. POWER TRAIN. This bulletin provides service information on noises from the drivetrain duel-mass flywheel. |
| A1323222072511_1 | 2024-01-04. Service bulletin. POWER TRAIN; FUEL SYSTEM, OTHER:KINETIC:FLYWHEEL,BEARINGS. This bulletin provides service information when there are noises from the drivetrain, dual mass flywheel. |
| A3523472064312_5 | 2024-01-04. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM); UNKNOWN OR OTHER. This bulletin provides information when the Gearbox warning is on, DTC P17F900 is stored in the TCM. |
| A3923552059129_4 | 2023-10-05. Service bulletin. POWER TRAIN. This bulletin provides information for when there are noises and/or vibrations in tight turns. |
| A3523452064312_4 | 2023-10-05. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). This bulletin provides information for when a Gearbox warning is on and DTC P17F900 is stored in the TCM. |
| A3423632070167_1 | 2023-06-06. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). This bulletin provides instructions for when DTC P1A5B00 is stored after replacing the transmission control module or valve body for another concern. |
| A3422592067653_1 | 2022-08-03. Service bulletin. POWER TRAIN. This bulletin provides instructions to address DTCs P071800, P276800, P071800, and P276800. |
| A3422562060242_3 | 2022-05-05. Service bulletin. POWER TRAIN. This bulletin contains instructions for when DTC P071800 and P081100 are stored with various transmission issues. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.