2022-2024 Audi e-tron U046900 Belt Starter Generator DTC

This technical communication from Audi addresses a range of diagnostic inquiries and common vehicle issues across various models, including the 2022-2024 Audi e-tron, specifically detailing initial steps for issues like the U046900 Belt Starter Generator DTC. This document serves as a guide for technicians to gather necessary information and contact the Audi Helpline for support before attempting repairs.

Important Guidance for Technicians

Audi emphasizes that for all topics covered in this communication, technicians must contact the Audi Helpline before attempting any repairs. Additionally, specific worksheets must be filled out and attached to the Technical Assistance Center (TAC) ticket. These worksheets are available on ServiceNet under 'Technician References >> Vin-4-Pin >> Worksheets'.

Overview of Reported Issues and Initial Diagnostic Steps

This bulletin outlines various symptoms and the initial diagnostic information required for each. Below is a summary of the issues and the steps technicians are advised to take:

Coolant Warning Lamp (Audi Q3 2020-2021)

Owners of 2020-2021 Audi Q3 vehicles may observe a "low coolant warning" in the instrument cluster, even when the coolant reservoir appears full. Technicians are advised that this issue is not related to TSB 2061918 and should provide a photo showing the coolant reservoir level to the Audi Helpline.

Catalytic Converter Inspection (Audi A6, A7, Q7, Q8, S4, S5 2019-2023 with 3.0L engine)

For vehicles experiencing a "P042000: Catalyst System, Bank1 Efficiency Below" DTC, technicians must provide a GFF Log with all fault codes and completed test plans. Oil and fuel samples may be requested through TAC, and after collection, the oil and filter should be changed. A completed VIN-4-Pin Worksheet is also required.

Abnormal/No Sound from Engine Sound Generator (All Audi models with 3.0L EA839 engine 2021-2023, related to GX36 P240200 (7L0 906 243 F))

If a vehicle has "Abnormal/no sound from engine sound generator," technicians need to provide video/sound recordings of the abnormal noise from inside the vehicle both before and after repair. A video/sound recording while running the sound actuator test is also required, along with uploading a GFF log with executed tests and relevant DTCs.

Valve Cover Leak (Audi Q3, Q5 2022-2023)

For 2022-2023 Audi Q3 and Q5 models with a "Valve cover leak," Audi requires documentation of three cases with no previous repairs, all within the New Vehicle Limited Warranty (NVLW) period.

Low Fuel Pressure (Audi Q3 2019-2023 with DTC P008700)

This issue, indicated by "P008700 Low fuel pressure," applies specifically to Audi Q3 models within the NVLW. Technicians must attach a completed worksheet upon initial contact with TAC.

Oil Pan Leak (Audi Q3 2020-2023)

For 2020-2023 Audi Q3 vehicles, if an "Oil leak found coming from the oil pan" is identified, this issue is covered by the bulletin.

Belt Noise from Starter Generator (Audi Q5 2023)

If a 2023 Audi Q5 exhibits "Belt noise from Starter Generator" during starting or running, technicians should provide an audio/video recording of the noise. Documentation of ambient conditions (temperature/humidity) and whether the complaint occurs over a wider temperature range or only when cold is also requested.

Boost Pressure Sensor and Check Engine Lamp (Audi Q3 2022 2.0L with DTCs P010600, P023600, P023700, P023800)

For 2022 Audi Q3 2.0L models where the "Check engine lamp is on" with DTCs such as P010600, P023600, P023700, P023800, documentation is needed. This includes a wiggle test harness, checking pin fitment and drag, checking circuit resistance (if applicable), photos of findings, and a completed Q3 Boost pressure sensor worksheet.

MMI Ghost Touches (Audi Q3 2022-2023)

If the "MMI display switching screens by itself, makes permanent clicking noises, MMI screen ghost touches pushes buttons by itself (Ghost Touches)" occurs in 2022-2023 Audi Q3 models, technicians are required to provide a video of the "ghost touches occurring."

Battery Voltage Warning / Belt Starter Generator DTC U046900 (Audi A3 2022-2024)

For 2022-2024 Audi A3 models, and potentially other vehicles like the Audi e-tron, a "Battery voltage warning" may appear, often accompanied by the "Belt Starter Generator DTC U046900 symptom 26950." This issue may require on-site/data logger installation. The document notes that the U046900 DTC with symptom code 26950 is found in the ECM, but no DTC is present in the BSG (Belt Starter Generator) module itself.

USB Trim Detached (All Audi models 2023)

For all 2023 Audi models, if the "USB trim panel is pushed in, loose or detached from center console," this issue is covered.

Noise from Front Door Trim Panel (Audi e-tron Quattro, e-tron SB 2021-2022)

Owners of 2021-2022 Audi e-tron Quattro and e-tron SB models may experience "Noise from Front Door Trim Panel while driving." Technicians must provide a video of the noise before repair and photos of the repair.

Noise from Front Door Speaker Grill (Audi A5 2021-2022)

For 2021-2022 Audi A5 models with "Noise from Front Door speaker Grill," photos of both sides of the thorax/side airbag wire harness label (Figures 2, 3) are required.

What Owners Should Do

If you experience any of the symptoms or warning messages described in this technical communication, such as a "Battery voltage warning" or a U046900 DTC in your Audi e-tron, it is recommended to schedule an appointment with an authorized Audi service center. Technicians will follow these specific diagnostic protocols and consult with the Audi Helpline to ensure proper diagnosis and repair.

NHTSA ID: 10241486