TSB: BMW 3 SERIES, 330E, 330I, 340I, 4 SERIES, 430I, 440I, 8 SERIES, 840I, 850I, M4, M4 GT4, M440I, X1, X1 SAV (2013–2024)

Bulletin B521723 — December 11, 2023

Bulletin Details

Bulletin IDB521723
ManufacturerBMW
Models3 SERIES, 330E, 330I, 340I, 4 SERIES, 430I, 440I, 8 SERIES, 840I, 850I, M4, M4 GT4, M440I, X1, X1 SAV
Model Years2013–2024
Date IssuedDecember 11, 2023
Date Added to NHTSAFebruary 1, 2024
ComponentELECTRICAL SYSTEM
Vehicles Affected105 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

Customer states one of the front seats is inoperative. The seat heater and power supply are inoperative .During the vehicle test, the seat module does not respond. The power supply fuse for the seat module is found to have blown.

Affected Vehicles

MakeModelYearComponent
BMW 330E 2024 110000 ELECTRICAL SYSTEM
BMW 330E 2024 220000 SEATS
BMW 330I 2024 110000 ELECTRICAL SYSTEM
BMW 330I 2024 220000 SEATS
BMW 430I 2024 110000 ELECTRICAL SYSTEM
BMW 430I 2024 220000 SEATS
BMW 840I 2024 110000 ELECTRICAL SYSTEM
BMW 840I 2024 220000 SEATS
BMW M4 2024 110000 ELECTRICAL SYSTEM
BMW M4 2024 220000 SEATS
BMW M440I 2024 110000 ELECTRICAL SYSTEM
BMW M440I 2024 220000 SEATS
BMW X1 2024 220000 SEATS
BMW 3 SERIES 2023 110000 ELECTRICAL SYSTEM
BMW 3 SERIES 2023 220000 SEATS
BMW 330E 2023 110000 ELECTRICAL SYSTEM
BMW 330E 2023 220000 SEATS
BMW 330I 2023 110000 ELECTRICAL SYSTEM
BMW 330I 2023 220000 SEATS
BMW 340I 2023 110000 ELECTRICAL SYSTEM
BMW 340I 2023 220000 SEATS
BMW 4 SERIES 2023 220000 SEATS
BMW 4 SERIES 2023 110000 ELECTRICAL SYSTEM
BMW 4 SERIES 2023 220000 SEATS
BMW 430I 2023 110000 ELECTRICAL SYSTEM
BMW 430I 2023 220000 SEATS
BMW 8 SERIES 2023 110000 ELECTRICAL SYSTEM
BMW 8 SERIES 2023 220000 SEATS
BMW 840I 2023 110000 ELECTRICAL SYSTEM
BMW 840I 2023 220000 SEATS
BMW 850I 2023 110000 ELECTRICAL SYSTEM
BMW 850I 2023 220000 SEATS
BMW M4 2023 110000 ELECTRICAL SYSTEM
BMW M4 2023 220000 SEATS
BMW M4 GT4 2023 110000 ELECTRICAL SYSTEM
BMW M4 GT4 2023 220000 SEATS
BMW M440I 2023 110000 ELECTRICAL SYSTEM
BMW M440I 2023 220000 SEATS
BMW X1 2023 220000 SEATS
BMW 330E 2022 110000 ELECTRICAL SYSTEM
BMW 330E 2022 220000 SEATS
BMW 330I 2022 110000 ELECTRICAL SYSTEM
BMW 330I 2022 220000 SEATS
BMW 430I 2022 110000 ELECTRICAL SYSTEM
BMW 430I 2022 220000 SEATS
BMW 840I 2022 110000 ELECTRICAL SYSTEM
BMW 840I 2022 220000 SEATS
BMW M4 2022 110000 ELECTRICAL SYSTEM
BMW M4 2022 220000 SEATS
BMW M440I 2022 110000 ELECTRICAL SYSTEM
BMW M440I 2022 220000 SEATS
BMW X1 2022 220000 SEATS
BMW X1 2022 110000 ELECTRICAL SYSTEM
BMW X1 2022 220000 SEATS
BMW 330E 2021 110000 ELECTRICAL SYSTEM
BMW 330E 2021 220000 SEATS
BMW 330I 2021 110000 ELECTRICAL SYSTEM
BMW 330I 2021 220000 SEATS
BMW 430I 2021 110000 ELECTRICAL SYSTEM
BMW 430I 2021 220000 SEATS
BMW 840I 2021 110000 ELECTRICAL SYSTEM
BMW 840I 2021 220000 SEATS
BMW M4 2021 110000 ELECTRICAL SYSTEM
BMW M4 2021 220000 SEATS
BMW M440I 2021 110000 ELECTRICAL SYSTEM
BMW M440I 2021 220000 SEATS
BMW X1 2021 220000 SEATS
BMW X1 2021 110000 ELECTRICAL SYSTEM
BMW X1 2021 220000 SEATS
BMW 330E 2020 110000 ELECTRICAL SYSTEM
BMW 330E 2020 220000 SEATS
BMW 330I 2020 110000 ELECTRICAL SYSTEM
BMW 330I 2020 220000 SEATS
BMW 340I 2020 110000 ELECTRICAL SYSTEM
BMW 340I 2020 220000 SEATS
BMW 430I 2020 110000 ELECTRICAL SYSTEM
BMW 430I 2020 220000 SEATS
BMW 440I 2020 110000 ELECTRICAL SYSTEM
BMW 440I 2020 220000 SEATS
BMW 840I 2020 110000 ELECTRICAL SYSTEM
BMW 840I 2020 220000 SEATS
BMW X1 2020 220000 SEATS
BMW X1 2020 110000 ELECTRICAL SYSTEM
BMW X1 2020 220000 SEATS
BMW 330I 2019 110000 ELECTRICAL SYSTEM
BMW 330I 2019 220000 SEATS
BMW 340I 2019 110000 ELECTRICAL SYSTEM
BMW 340I 2019 220000 SEATS
BMW X1 2019 220000 SEATS
BMW X1 2019 110000 ELECTRICAL SYSTEM
BMW X1 2019 220000 SEATS
BMW X1 2018 220000 SEATS
BMW X1 2018 110000 ELECTRICAL SYSTEM
BMW X1 2018 220000 SEATS
BMW X1 2017 220000 SEATS
BMW X1 2017 110000 ELECTRICAL SYSTEM
BMW X1 2017 220000 SEATS
BMW X1 SAV 2017 110000 ELECTRICAL SYSTEM
BMW X1 SAV 2017 220000 SEATS
BMW X1 2016 220000 SEATS
BMW X1 2015 220000 SEATS
BMW X1 2014 220000 SEATS
BMW X1 2013 220000 SEATS
BMW 3 SERIES 220000 SEATS
BMW 8 SERIES 220000 SEATS

Related BMW Recalls

CampaignModelYearComponentSummary
C EVOLUTION 2017 ELECTRICAL SYSTEM:WIRING:CONNECTORS/P... BMW of North America, LLC (BMW) is recalling certain 2017-2018 C Evolution mo...
C EVOLUTION 2018 ELECTRICAL SYSTEM:WIRING:CONNECTORS/P... BMW of North America, LLC (BMW) is recalling certain 2017-2018 C Evolution mo...
K 1600 GRAND AMERICA 2024 POWER TRAIN:MANUAL TRANSMISSION:SEALS... BMW of North America, LLC (BMW) is recalling certain 2017-2025 K 1600 GT, GTL...
K 1600 GRAND AMERICA 2023 POWER TRAIN:MANUAL TRANSMISSION:SEALS... BMW of North America, LLC (BMW) is recalling certain 2017-2025 K 1600 GT, GTL...
K 1600 B 2017 POWER TRAIN:MANUAL TRANSMISSION:SEALS... BMW of North America, LLC (BMW) is recalling certain 2017-2025 K 1600 GT, GTL...

What Should You Do?

If your vehicle is affected by this TSB, contact your authorized BMW dealer. Bring this bulletin ID (B521723) 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.