This bulletin applies to 2015-2017 Audi A8 vehicles equipped with a 3.0L TFSI engine. The warning light might be on accompanied by diagnostic trouble code (DTC) P046100 (fuel level sensor circuit range/performance). This DTC can be caused by miscalculations within the engine control module (ECM) software when the vehicle is being fueled with gasoline when the ignition is on. New ECM software has been implemented to correct this condition. Check the vehicle’s ECM software part number/version prior to the update. If the software has already been updated, replace the respective fuel sensor only.
Update the ECM, J623 (address word 0001) using the support vector machines (SVM) action code 01A203 (old and new software P/N 4H2907551A; old version 0001/0003/0004; new version 0008; SVM code input 01A203).
After SVM update, cycle the ignition.
Start the engine. If the engine runs rough and then surges, cycle the ignition once again.
About the Author
Information courtesy of Mitchell 1
Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.
Mike Mavrigian
Motor Age Editor
Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety of specialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.