Audi A4 2009–2012 — technical service bulletin
Bulletin 01133020270825 · NHTSA communication 10225004 · issued Sep 20, 2021
Technical service bulletin
communication type
Engine and Engine Cooling
component
2009–2012
model years
16
vehicle entries
Official summary
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.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.