Audi A8 2008–2015 — technical service bulletin
Bulletin A191563 2042328- · NHTSA communication 10123703 · issued Oct 29, 2015
Technical service bulletin
communication type
Engine and Engine Cooling
component
2008–2015
model years
10
vehicle entries
Official summary
The red coolant light is illuminated, indicating that the coolant temperature is too high or that the coolant level is too low. The engine speed governing light is illuminated with the message ?Engine speed maximum XXXX rpm?. To prevent the engine from overheating, the engine speed is automatically limited to the displayed maximum. DTCs are stored in the ECM. Tolerances of opening spring in thermostat cause the condition.
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.