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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.

About P0234 on the 2009 Audi A4: what the code means, and the bulletins and recalls about the same components.

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Only bulletins with trouble code: P0234 are shown. Show all

Bulletins, newest first
011330202708252023-01-03. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER. DTC P0234 (Turbo/Super Charger Overboost Condition) is stored in the engine control module, J623 (address word 01). No other DTCs are stored. Technical Background DTC P0234 can be set inadvertently by the software application.
011330202708252022-10-31. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER. DTC P0234 (Turbo/Super Charger Overboost Condition) is stored in the engine control module, J623 (address word 01). No other DTCs are stored. Technical Background DTC P0234 can be set inadvertently by the software application.
011330202708252022-09-26. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER. DTC P0234 (Turbo/Super Charger Overboost Condition) is stored in the engine control module, J623 (address word 01). No other DTCs are stored. Technical Background DTC P0234 can be set inadvertently by the software application.
A011330 2027082-2017-10-31. Service bulletin. ENGINE. Supersedes Technical Service Bulletin Group 24 number 12-28 dated April 24, 2012. MIL on. DTC P0234 (Turbo/Super Charger Overboost Condition) is stored in the engine control module, J623 (address word 01). No other DTCs are stored. DTC P0234 can be set inadvertently by the software application. DTC P0234 can be set with an actual cause in combination with loss of engine power and low/uneven engine performance, based on charge pressure control.

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