Audi May Be Too Sensitive

When servicing a 2016-2017 Audi A6, DTC P050100 (speed signal 1, implausible signal) may be stored and the EPC light may be on. It can be caused by air leaks in the intake and/or crankcase ventilation system. In some cases, due to allowable hardware tolerances, the diagnostics in the ECU software may be too sensitive.

Information courtesy of Mitchell 1

Mike Mavrigian

July 22, 2022

When servicing a 2016-2017 Audi A6, DTC P050100 (speed signal 1, implausible signal) may be stored and the EPC light may be on. This DTC can be caused by air leaks in the intake and/or crankcase ventilation system. In some cases, due to allowable hardware tolerances, the diagnostics in the ECU software may be too sensitive.

Perform the following steps before updating the ECM software:

Complete the guided fault finding (GFF) test plan for DTC P050100.
If GFF identified an issue, perform the needed repairs.
If GFF does not identify the issue, check the oil filler cap and dipstick tube plug to ensure that they are correctly closed.

If no other issues are found, proceed with the software update. Update the ECM, J623 (address word 0001). The new software P/N is 4G5907115C..version 0001 or higher.

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.