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Service bulletins for the 2018 Audi A3

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.

640 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
Dealer 34L4 Rev22024-01-04. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). Transmission Control Module (TCM) Software - Updated parts and claiming information
Circular34L4Rev22024-01-04. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). Transmission Control Module (TCM) Software - Updated parts and claiming information
Dealer34L4_REV12023-12-07. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). Transmission Control Module (TCM) Software - Updated repair steps after software update is completed. Added example photos of transmission damage.
Circ34L4_REV12023-12-07. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). Transmission Control Module (TCM) Software - Updated repair steps after software update is completed. Added example photos of transmission damage.
A3523462050723_42023-11-06. Service bulletin. POWER TRAIN. This bulletin provides information for when there is a Gearbox Malfunction warning stored in the TCM; DTCs P176F00, P176E00, P175E00, P175D00, P189900, P060700, P081000.
A3523442070217_12023-10-05. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). This bulletin provides information for when the Gearbox warning comes on, and various DTC memory entries are stored in the TCM.
Dealer 34L42023-09-01. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM); POWER TRAIN. Dealer Letter to announce Repair Available - Service Action 34L4 / TCM Software
Circular 34L42023-09-01. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM); ELECTRICAL SYSTEM; POWER TRAIN. Audi is providing updated transmission control module (TCM) software to enhance an in-vehicle alert should a problem arise within the auxiliary hydraulic pump. Additionally, if a specific fault is found after the software is updated, a repair will be made to the transmission.
A3523432050723_32023-09-01. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM); POWER TRAIN. This bulletin provides information for when Gearbox Malfunction Warning, DTC P0C2900, P176F00, P176E00 or P175E00 stored in the TCM.
A3923532043144_92023-05-05. Service bulletin. POWER TRAIN. This technical service bulletin provides repair instructions for the all-wheel drive coupling.
A3422582067365_12022-08-03. Service bulletin. POWER TRAIN; ENGINE AND ENGINE COOLING. This bulletin describes the appropriate repairs in instances where an oil leak is found near the transmission oil cooler.
A4022332066441_12022-04-05. Service bulletin. POWER TRAIN:AXLE ASSEMBLY. This bulletin describes the procedure to address a clicking noise from the front axle when turning.
A3421512050725_22021-04-06. Service bulletin. POWER TRAIN. This bulletin contains repair instructions for when TAC directs the tech to this TSB in regards to DTCs stored in the TCM.
A3020292060560_12020-09-03. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:INTERNAL:CLUTCHES/BANDS. This bulletin contains instructions for when the clutch is slipping, there is a gearbox malfunction message, and the vehicle shudders on odd number digits (several DTCs could be stored as well).
A3920332043144_72020-08-06. Service bulletin. POWER TRAIN:DRIVELINE:HYDRAULIC:MOTOR/PUMP; ELECTRONIC STABILITY CONTROL (ESC):CONTROL MODULE:SOFTWARE. This technical service bulletin provides repair instructions for the all-wheel drive coupling.
A3720992060148_12020-08-06. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:OIL/LUBRICATION: OIL COOLER; POWER TRAIN:MANUAL TRANSMISSION:INTERNAL:GEARS. This informational bulletin states to not replace parts for the beveling groove as it is normal.
A3720002060146_12020-08-06. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE:SOFTWARE; ENGINE. This bulletin contains a software update that addresses a brief but sudden increase in engine speed without DTCs or leaks.
AWA 20-032020-05-07. Service bulletin. POWER TRAIN. This Document informs dealers on the new gear shift micro switch warranty extension for 2019 Q3 and 2015-2019 A3 vehicles
A3520372058504_12020-03-05. Service bulletin. POWER TRAIN. This bulletin contains repair instructions for when DTC P173500 and/or P173600 are logged with a shuddering transmission or messages or Limp Home Mode.

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