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Service bulletins for the 2009 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.

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

By type

By component

By trouble code

Bulletins, newest first
37 12 75 20298082022-05-31. Service bulletin. POWER TRAIN. Customer may report the vehicle holds second gear intermittently
34 13 13 20286502022-05-31. Service bulletin. SUSPENSION:FRONT:WHEEL BEARING; WHEELS. Grinding or wheel bearing type noises from front when accelerating or at constant speed
30 13 18 20282292022-05-31. Service bulletin. ELECTRICAL SYSTEM; POWER TRAIN:MANUAL TRANSMISSION; ENGINE. Vehicle does not start or only starts when the clutch pedal is pressed very firmly
28 13 22 20284192022-05-31. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM). Fault stored in access start authorization control unit
28 13 21 20175552022-05-31. Service bulletin. ENGINE; ELECTRICAL SYSTEM:IGNITION:ANTI-THEFT:IMMOBILIZER/PROXIMITY:KEY/SENDER. Key does not stay or engage in ignition lock
27 14 24 20253602022-05-31. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY. Low battery charge: Diagnosis tips and TAC instructions
27 13 19 20290102022-05-31. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY. Low battery charge: excess current draw location
27 13 18 20232822022-05-31. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY. Battery testing and charging - vehicles with BDM
26 13 18 20279452022-05-31. Service bulletin. EQUIPMENT:MECHANICAL; ELECTRICAL SYSTEM:12V/24V/48V BATTERY. Humming or metallic rattling noise from under the vehicle, heard most consistently during engine idle or slow acceleration. Initial inspection indicates that the noise is coming from the exhaust system. Relative movements in the rear mounting of the exhaust system (rear silencer).
26 13 17 20279452022-05-31. Service bulletin. ENGINE; POWER TRAIN:AUTOMATIC TRANSMISSION. Humming or metallic rattling noise from under the vehicle, heard most consistently during engine idle or slow acceleration. Initial inspection indicates that the noise is coming from the exhaust system. Relative movements in the rear mounting of the exhaust system (rear silencer).
24 14 50 20382122022-05-31. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM). The engine judders or runs erratically. The vehicle judders during acceleration. No event entry is stored in the engine control module (ECM). The air mass meter is suspected to be faulty. Possible incorrect function on the sensor elements of the air mass meter.
A4022382024318122022-05-05. Service bulletin. WHEELS. This bulletin describes the proper procedure to address a clicking or clacking noise from the wheel bearing
A9022572032113_62022-05-05. Service bulletin. EQUIPMENT:ELECTRICAL. This is an informational bulletin containing information about the outside temperature reading.
37 14 31 20130022022-05-02. Service bulletin. POWER TRAIN; ENGINE AND ENGINE COOLING; POWER TRAIN:AUTOMATIC TRANSMISSION:FLUID/LUBRICANT:SEALS/GASKETS. As the sump pan gasket settles, the torque of the bolts decreases and the seal may leak. Automatic transmission fluid is leaking at the sump pan gasket.
37 14 30 20036582022-05-02. Service bulletin. ELECTRONIC STABILITY CONTROL (ESC):CONTROL MODULE:SOFTWARE; POWER TRAIN. This condition may be caused when the brake pedal and the accelerator pedal are depressed simultaneously. Drivers who drive with their left foot resting on the brake pedal are prone to experience this condition. With the introduction of Electronic Power Control (EPC) (no accelerator cable) to fuel injection systems, an engine RPM control feature has been incorporated into the engine electronic control system software. Customer states that the engine returns to idle speed of approximately 1,400 RPM although the accelerator is depressed, and/or the vehicle hesitates (lacks power on take-off).
37 14 23 20284722022-05-02. Service bulletin. ELECTRICAL SYSTEM:IGNITION:SWITCH; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; ELECTRICAL SYSTEM; UNKNOWN OR OTHER. The ignition key cannot be removed even though the gear shifter is in Park (P). The vehicle is mechanically in the Park position, but this is not recognized electronically. The gear shifter cannot be moved from the Park position. On vehicles with Audi advanced key, the vehicle cannot be locked by remote control after the engine has been switched off.The Park position of the gear shifter is sporadically not recognized, which causes the ignition key to not be cleared and prevents the vehicle from being locked.
37 13 81 20211932022-05-02. Service bulletin. ENGINE; STEERING:GEAR BOX (OTHER THAN RACK AND PINION); POWER TRAIN:MANUAL TRANSMISSION. Because of an unfavorable adjustment between engine and gearbox, vehicle can shudder under certain driving conditions when changing from second to first gear.
37 13 09 20287152022-05-02. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY; POWER TRAIN:AUTOMATIC TRANSMISSION:INTERNAL:GEARS. After a mechatronics, torque converter, or complete gearbox replacement, the clutches must be adapted to the new component. This requires a gradual move of the clutch linings toward the optimal operating points in the most diverse load conditions. As a result, sporadic driving power disruptions lasting for less than a second or reduced shift comfort are possible over the first 500 miles. This is normal, and these issues will decrease over time. The issues can also occur if the adaptation values of the gearbox were deleted.
37 13 07 20336582022-05-02. Service bulletin. SERVICE BRAKES. This condition may be caused when the brake pedal and the accelerator pedal are depressed simultaneously. Drivers who consciously or unconsciously drive with their left foot resting on the brake pedal are prone to experience this condition. With the introduction of Electronic Power Control (EPC) (no accelerator cable) to fuel injection systems, an engine RPM control feature has been incorporated into the engine electronic control system software. As a result, application of the brake and accelerator pedals at the same time (brake pedal with left foot and accelerator pedal with right foot) results in the following: ? Brake pedal function (normal at all times) overrides any throttle application. ? Diagnostic Trouble Codes (DTCs) will not be stored. ? When the brake pedal is applied while the accelerator is depressed, engine RPMs will return to idle speeds of 1400 RPMs after approximately two seconds. ? When the accelerator is applied while the brake pedal is depressed, the vehicle accelerates slower than usual (reduced engine torque).
37 12 75 20298082022-05-02. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). New software in the Transmission Control Module (J217) addressed the condition.
34 13 13 20286502022-05-02. Service bulletin. POWER TRAIN. Customer states constant howling, droning, or scraping noises heard from the front of the vehicle when accelerating lightly. The ball bearing for the left flange shaft spins in the gearbox housing because of a gap between the outer bearing ring and the support bracket. This can result in grinding marks and swarf (Figure 1, Figure 2).
30 13 18 20282292022-05-02. Service bulletin. POWER TRAIN:MANUAL TRANSMISSION; ELECTRICAL SYSTEM. There may be clutch mechanism wear. Customer may report that the vehicle does not start or only starts when the clutch pedal is pressed very firmly. The message ?Press clutch pedal to start vehicle? may appear in the instrument cluster.
28 13 22 20284192022-05-02. Service bulletin. SEAT BELTS; STEERING. Before a replacement electronic steering column lock control unit, J764, is installed, the software of the access start authorization control unit, J393, must be updated due to a diagnostic software error that prevents the DTC from being cleared.
28 13 21 20175552022-05-02. Service bulletin. ELECTRICAL SYSTEM. It is possible that objects have been inserted into the ignition lock, which causes the slide of the ignition lock to become stuck in the rear part of the lock (S-contact position). The stuck slide is not allowed to return to the starting point (0-position).
27 14 24 20253602022-05-02. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY; ELECTRICAL SYSTEM. This TSB provides basic diagnosis steps for discharged batteries, general tips for working with batteries, and system verification steps to ensure that the vehicle is configured correctly. For additional information on known current draw issues, refer to the following TSBs: ? 2014127: 27 Battery dead or low after returning to the vehicle (2007 A6, A8, Q7) ? 2019143: 27 Battery discharged on some vehicles with Advanced Key (2005 - 2008 A6, Q7)

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