This bulletin applies to 2016-2023 Audi TT/TTS/TT Roadster, 2016-2020 A3/S3, 2016-2019 A3 Cabriolet, 2017-2020 RS3 and 2018-2022 TT RS vehicles.
Several warning lamps (ABS, TPMS, etc.) may be on sporadically when the engine is started (both manually and in start/stop mode). DTC B116831 (steering angle sensor no signal) may be stored in the ABS module. There is a voltage drop in the power steering control module. This DTC is logged in the power steering control module because it does not participate in the data bus communication during the start procedure. The main fuse carrier may be the cause.
When the engine is started, the voltage should not drop by more than one volt at contact 4 in the fuse carrier. This is the power supply to the power steering control module. If the voltage drops more than one volt, the fuse carrier must be replaced.
