{"nhtsa_id":10121296,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2017-10-31","date":"2013-10-09","document_id":"A011336 2035235-","mfr_campaign":null,"replaces":null,"component":"FUEL SYSTEM, OTHER:DELIVERY:FUEL PUMP; ENGINE","mfr_system":null,"summary":"The customer reports that the engine warning light illuminates sporadically. The engine may have reduced performance without significant loss of power or stalling. Noise is heard coming from the engine compartment, specifically from the High Pressure Fuel Pumps 2. DTCs are stored in the engine control module (ECM). 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.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2013/MC-10121296-9999.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2013/MC-10121296-0001.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10121296","components":[{"id":"engine","name":"Engine","parent":null},{"id":"fuel-system","name":"Fuel system","parent":null},{"id":"fuel-pump","name":"Fuel pump","parent":"fuel-system"}],"codes":[],"topics":[],"vehicles":[{"make":"AUDI","model":"A8","year_from":2013,"year_to":2014,"match":"exact","vehicle_ids":["2013_audi_a8","2014_audi_a8"]},{"make":"AUDI","model":"S6","year_from":2013,"year_to":2014,"match":"exact","vehicle_ids":["2013_audi_s6","2014_audi_s6"]},{"make":"AUDI","model":"S7","year_from":2013,"year_to":2014,"match":"exact","vehicle_ids":["2013_audi_s7","2014_audi_s7"]},{"make":"AUDI","model":"S8","year_from":2013,"year_to":2014,"match":"exact","vehicle_ids":["2013_audi_s8","2014_audi_s8"]}],"as_of":"2026-10-19","note":"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.","attribution":[]}