Audi A8 2013–2014 — technical service bulletin
Bulletin 01146120352352 · NHTSA communication 10222043 · issued Jan 23, 2014
Technical service bulletin
communication type
Fuel System, Gasoline
component
2013–2014
model years
6
vehicle entries
Official summary
The fuel metering valve of the high-pressure fuel pump is controlled by a specific on/off ratio. If there is a low system voltage, the on/off ratio may not be enough to keep the fuel metering valve constant in all areas. In such a situation, the fuel metering valve is deactivated and the high-pressure fuel pump switches to full supply mode. Because the increased rail pressure does not match the respective driving situation, the DTC appears.
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.