Service bulletins for the 2018 Audi S8
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.
344 on file from NHTSA, as of 2026-10-19.
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By component
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Only bulletins with component: Transmission and driveline are shown. Show all
| TSB_2074808_4 | 2026-06-04. Service bulletin. POWER TRAIN. The high-voltage batteries in electric vehicles are subject to various ageing effects which could lead to the energy content (energy density) being reduced. This reduction in the energy content, which is due to factors. Revised header. Added Model years |
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| TSB_2074808_3 | 2026-01-07. Service bulletin. POWER TRAIN. This bulletin provides additoinal information to assist in determining the energy content of lithium-ion high-voltage batteries. |
| TSB_2060560_4 | 2025-08-05. Service bulletin. POWER TRAIN. This bulletin providesi nformation when various DTCs are stored; high maximum temperature recorded for clutch K1. |
| A3920342060169_1 | 2020-08-06. Service bulletin. EQUIPMENT; POWER TRAIN:DRIVELINE:DIFFERENTIAL UNIT. This bulletin contains instructions for when DTC U101300 is logged with sports differential warning lamps or messages. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.