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Service bulletins for the 2018 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.

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

By type

By component

By trouble code

By topic

Only bulletins with component: Transmission and driveline are shown. Show all

Bulletins, newest first
A3924642074618_12024-08-06. Service bulletin. POWER TRAIN. This bulletin provides information when there are vibration or binding in tight turns with quattro Ultra.
A3924632059057_92024-08-06. Service bulletin. POWER TRAIN. This bulletin provides information when there are vibrations or binding in tight turns.
A3724202074806_12024-08-06. Service bulletin. POWER TRAIN. This bulletin provides information for when there are noises after selecting a gear at idlijng speed when the vehicle is stationary; noises when driving in different gears.
A3724192074766_22024-08-06. Service bulletin. POWER TRAIN. This bulletin provides information when tehre are homing noises when cornering; 0CK gearbox.
A3724172074804_12024-08-06. Service bulletin. POWER TRAIN. This bulletin provides information for when there are dorning/vibrations in tight bends - 0CL Gearbox.
A3724142074751_12024-08-06. Service bulletin. POWER TRAIN. This bulletin provides information about replacing the clutch end cover.
A3724132074750_12024-08-06. Service bulletin. POWER TRAIN. This bulletin provides information about replacing the clutch end cover.
A3424712074761_12024-08-06. Service bulletin. POWER TRAIN. This bulletin provides informion for when there is difficulty changing gear/complaints about changing gear - 1st and/or 2nd gear.
A2424612074810_12024-08-06. 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.
A3924602059057_82024-05-06. Service bulletin. POWER TRAIN. This bulletin provides information when there is binding or vibrations in tight turns in vehicles equipped with quattro Ultra.
A3924582059057_72024-03-06. Service bulletin. POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE). This bulletin provides information when quattro Ultra has vibrations or binding in tight turns.
A1524462072713_12024-02-06. Service bulletin. POWER TRAIN. This bulletin provides service information on noises from the drivetrain duel-mass flywheel.
A1323222072511_12024-01-04. 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.
A3923552059129_42023-10-05. Service bulletin. POWER TRAIN. This bulletin provides information for when there are noises and/or vibrations in tight turns.
A3423632070167_12023-06-06. 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.
A3022312053597_62023-01-06. Service bulletin. POWER TRAIN. This bulletin contains repair instructions for when there is a leak from the lower bellhousing.
A3422562060242_32022-05-05. Service bulletin. POWER TRAIN. This bulletin contains instructions for when DTC P071800 and P081100 are stored with various transmission issues.
A3422542060242_22022-04-05. Service bulletin. POWER TRAIN. This bulletin contains instructions for when DTC P071800 and P081100 are stored with various transmission issues.
A3421532064848_12021-11-05. Service bulletin. POWER TRAIN. This bulletin addresses an issue where basic settings cannot be performed as DTC P17F900 is stored in the TCM.
A3020302053597_52020-12-04. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:FLUID/LUBRICANT; EQUIPMENT ADAPTIVE/MOBILITY. This bulletin contains repair instructions for when there is a leak from the lower bellhousing.
A3920352051558_42020-09-03. Service bulletin. POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE); EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT. This bulletin contains repair instructions for when the message "four-wheel drive malfunction" shows up sporadically in the instrument cluster with DTC C05ED00.
A3020282053597_42020-09-03. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION; EQUIPMENT; POWER TRAIN:CLUTCH ASSEMBLY:BELL HOUSING. This bulletin contains repair instructions for when there is a leak from the lower bellhousing.
A3020272060101_22020-08-06. Service bulletin. POWER TRAIN:MANUAL TRANSMISSION:INTERNAL:GEARS. This bulletin contains instructions for DTCs P181C00, P181E00, and P181E00 with Start-Stop not working or a message appearing.
A3920342060169_12020-08-06. Service bulletin. EQUIPMENT; POWER TRAIN:DRIVELINE:DIFFERENTIAL UNIT. This bulletin contains instructions for when DTC U101300 is logged with sports differential warning lamps or messages.
A3020262060101_12020-08-06. Service bulletin. ENGINE; POWER TRAIN:MANUAL TRANSMISSION:INTERNAL:GEARS. This bulletin contains instructions for DTCs P181C00, P181E00, and P181E00 with Start-Stop not working or a message appearing.

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