TSB: AUDI A4, A5, A5 CABRIOLET, A6, A7, AUDI, Q5, S4, S5, S5 CABRIOLET, S6, S7, SQ5 (2018–2020)

Bulletin A3921422051558_6 — March 2, 2021

Bulletin Details

Bulletin IDA3921422051558_6
ManufacturerAUDI
ModelsA4, A5, A5 CABRIOLET, A6, A7, AUDI, Q5, S4, S5, S5 CABRIOLET, S6, S7, SQ5
Model Years2018–2020
Date IssuedMarch 2, 2021
Date Added to NHTSAApril 6, 2021
ComponentELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
Vehicles Affected29 combinations

What is a TSB?

A Technical Service Bulletin is a document issued by the vehicle manufacturer to inform dealership technicians about a known issue and the recommended repair procedure. TSBs are not mandatory recalls — they serve as repair guidance for common problems.

If your vehicle has this issue, bring this bulletin ID to your dealer. If under warranty, the repair should be covered at no cost.

Summary

This bulletin contains repair instructions for when the message "four-wheel drive malfunction" shows up sporadically in the instrument cluster with DTC C05ED00.

Affected Vehicles

MakeModelYearComponent
AUDI A6 2020 117000 ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
AUDI A7 2020 117000 ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
AUDI S6 2020 117000 ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
AUDI S7 2020 117000 ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
AUDI A4 2019 117000 ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
AUDI A5 2019 117000 ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
AUDI A5 CABRIOLET 2019 117000 ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
AUDI A6 2019 117000 ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
AUDI A7 2019 117000 ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
AUDI Q5 2019 117000 ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
AUDI S4 2019 117000 ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
AUDI S5 2019 117000 ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
AUDI S5 CABRIOLET 2019 117000 ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
AUDI S6 2019 117000 ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
AUDI S7 2019 117000 ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
AUDI SQ5 2019 117000 ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
AUDI A4 2018 117000 ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
AUDI A5 2018 117000 ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
AUDI A5 CABRIOLET 2018 117000 ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
AUDI A6 2018 117000 ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
AUDI A7 2018 117000 ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
AUDI Q5 2018 117000 ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
AUDI S4 2018 117000 ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
AUDI S5 2018 117000 ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
AUDI S5 CABRIOLET 2018 117000 ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
AUDI S6 2018 117000 ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
AUDI S7 2018 117000 ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
AUDI SQ5 2018 117000 ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
AUDI AUDI 117000 ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL

Related AUDI Recalls

CampaignModelYearComponentSummary
Q8 2019 LANE DEPARTURE:SOFTWARE Volkswagen Group of America, Inc. (Audi) is recalling certain 2019 Audi Q8, A...
A7 2019 LANE DEPARTURE:SOFTWARE Volkswagen Group of America, Inc. (Audi) is recalling certain 2019 Audi Q8, A...
A6 2019 LANE DEPARTURE:SOFTWARE Volkswagen Group of America, Inc. (Audi) is recalling certain 2019 Audi Q8, A...
A6 2019 LANE DEPARTURE:SOFTWARE Volkswagen Group of America, Inc. (Audi) is recalling certain 2019 Audi Q8, A...
A7 2019 LANE DEPARTURE:SOFTWARE Volkswagen Group of America, Inc. (Audi) is recalling certain 2019 Audi Q8, A...

What Should You Do?

If your vehicle is affected by this TSB, contact your authorized AUDI dealer. Bring this bulletin ID (A3921422051558_6) when you visit. If under warranty, the repair should be free. If your warranty has expired, ask about goodwill coverage — manufacturers sometimes cover TSB-related repairs beyond the warranty period.

Frequently Asked Questions

A recall is a mandatory safety fix — the manufacturer must repair every affected vehicle for free. A TSB is an advisory document that describes a known issue and the recommended fix, but repairs are not required. However, some TSBs eventually lead to recalls if the issue poses a safety risk. TSBs are generally issued for quality or performance problems, while recalls address safety defects.

If your vehicle is still under the manufacturer's warranty, TSB-related repairs are typically covered at no cost. If your warranty has expired, you can ask the dealer about goodwill or customer assistance programs. Many manufacturers will cover or partially cover repairs for well-known issues, especially if the TSB was issued recently or affects a large number of vehicles.

Check the make, model, and model year listed above against your vehicle. If they match, this bulletin likely applies. However, TSBs may only affect vehicles with specific production dates, VIN ranges, or configurations. Your dealer can confirm by entering your VIN into their service system, which will show all applicable TSBs and recalls.

This data comes from the National Highway Traffic Safety Administration (NHTSA). Manufacturers are required to submit copies of all communications (including TSBs) sent to their dealers to NHTSA. The agency makes this data publicly available as part of its vehicle safety monitoring program.