Service bulletins for the 2012 Audi S4
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.
795 on file from NHTSA, as of 2026-10-19.
About P174B on the 2012 Audi S4: what the code means, and the bulletins and recalls about the same components.
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Only bulletins with trouble code: P174B are shown. Show all
| 3412122032227 | 2024-02-20. Service bulletin. POWER TRAIN. Gearbox warning light on - vehicles with 7 Speed S-tronic (DTC P174B or P174F in gearbox control unit) |
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| A341212 2032227- | 2017-11-08. Service bulletin. POWER TRAIN. The gearbox warning light is on. P174B (valve 4 in the sub-gearbox 1, electric complaint) or P174F (valve 4 in the sub-gearbox 2, electric complaint) is logged in the gearbox control unit. The entry occurs mainly up to an ATF temperature of 30°C. Check this in the extended environmental conditions of the diagnosis protocol. The entry only occurs once and cannot be reproduced. After a reset there are no more complaints. |
| A351620 2030477- | 2017-10-04. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. Gearbox malfunction message in cluster. DTCs P17D800, P179D00, P174000, P174C, P174B, P174F, P179C, P174A, and/or P174E are stored in the transmission control module. Fault codes and symptom codes must match exactly or this TSB should not be followed. Poor internal contact area on circuit board will lead to faults. Oil additives can cause the plastic circuit plates to delaminate, causing contact loss. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.