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Service bulletins for the 2020 BMW M340i

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

251 on file from NHTSA, as of 2026-10-19.

By type

By component

Only bulletins with component: Electrical system are shown. Show all

Bulletins, newest first
B6101202020-11-16. Service bulletin. EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY; ELECTRICAL SYSTEM. ACCESSORIES DO NOT POWER ON: Customer is unable to power up or charge accessories through a plug adapter inserted in the front 12-volt power socket plug. Alternatively, it will only operate when constant downward hand pressure is maintained. A design change was intended to reduce short circuits and blown fuses. When the plug adapter is inserted, the center contact pin may not make proper contact with the center pin of the power socket plug.
B3410202020-11-16. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; SERVICE BRAKES; ENGINE. TICKING NOISE FROM DRIVERS FOOTWELL DURING LIGHT BRAKING WHILE COASTING: A ticking sound can be heard from the drivers footwell while coasting with the engine OFF. The noise occurs when the pedal is slightly pressed with minimum force without the brake light being activated.
B6113202020-10-19. Service bulletin. ELECTRICAL SYSTEM. SERVICE ACTION - CHECKING THE DUAL STORAGE SYSTEM AND REPLACE IF NECESSARY: In the event of an accident, the two-battery Dual Storage System (DSS) is disconnected from the electrical system via an internal relay. In some cases, the relay is stuck closed and a fault is set. In these circumstances: A crash shutdown of the DSS does not occur The power distribution box is supplied with power until the DSS is fully discharged.
B6624192020-09-14. Service bulletin. ELECTRICAL SYSTEM. REMOTE CONTROL IS NOT DETECTED: Vehicle cannot be opened or closed using comfort access, engine start is not possible, and the vehicle may not start when placing the key against the steering column. Note: Opening, closing and starting via the BMW Digital Key or the Digital Key Card are not affected. Software error in the BDC (Body Domain Controller) module.
B6619192020-09-14. Service bulletin. ELECTRICAL SYSTEM. COMFORT ACCESS AND COMFORT GO NOT POSSIBLE: Vehicle cannot be unlocked/locked or started via Comfort Access. Remote control functionality is restored by pressing any of the key buttons or by removing and reinstalling the remote control key battery.
B6515202020-09-14. Service bulletin. ELECTRICAL SYSTEM. HEAD UNIT RESETS WHEN NAVIGATION IS USED IN CERTAIN LOCATIONS: The head unit resets sporadically causing the CID to turn black and then starts up again after a short time with the message "Start navigation system". This only occurs during navigation guidance when the "3D building" function is used Software in the Head Unit High (HU-H3).
B6117202020-09-14. Service bulletin. ELECTRICAL SYSTEM. DELIVERY STOP - HIGH-VOLTAGE BATTERY: Please do not charge the vehicle high-voltage battery until further notice. There may be a potential issue in the welding process of the HV-modules.
B6101202020-09-14. Service bulletin. ELECTRICAL SYSTEM. ACCESSORIES DO NOT POWER ON: Customer is not able to power accessories using the 12 volt power socket. Design change to reduce short circuits and blown fuses.
B1222192020-09-14. Service bulletin. ELECTRICAL SYSTEM. EME GROUND CONNECTION MONITORING FAULTS: Check Control message (CCM ID 794): "Drive. Check as soon as possible" illuminates. Increased ground cable contact resistance at Electrical Machine Electronics (EME) due to corrosion/oxidation.
B0902202020-09-14. Service bulletin. ELECTRICAL SYSTEM. REMOTE SOFTWARE UPGRADE: For BMW, Remote Software Upgrade (RSU) is the next consequent step with regard to digitalization and customer satisfaction. With the introduction of RSU, customers now can update the vehicle software by themselves.
B0902182020-09-14. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; ELECTRICAL SYSTEM. NEW ECU VALIDATION NEEDED AFTER REPLACING CERTAIN CONTROL MODULES: With introduction of the new Headunit HU-H3 (MGU Media Graphics Unit), there is a new protection mechanism against tampering. If one or more of the following components needs to be replaced, the secure connection between them must be re-established: MGU TCB Telematic Communication Box (ATM-02) RSE Rear Seat Entertainment and/or KOMBISP18 instrument cluster Prior to re-establishing this connection, an electronic certificate must be created in the BMW backend for importing into the Vehicle. After the replacement of one of the mentioned Modules, the Control Module needs a valid certificate for it to communicate with the other Modules.
B8404202020-08-31. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. SERVICE ACTION - PROGRAM TELEMATICS MODULE: A software error in the telematics control unit can result in an interruption in communication between the vehicle and the back end (BMW server). Software error in the Advanced Telematics Module (ATM).
B6512202020-08-31. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. BMW CONNECTEDDRIVE APPS ARE NO LONGER AVAILABLE AFTER PROGRAMMING: After programming vehicle with "20-03" software, BMW ConnecedDrive apps are no longer available in the head unit. Software in the Head Unit High (HU-H3).
B6507092020-08-31. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. NAVIGATION SYSTEM - REPORTING MISSING OR INCORRECT ROADMAP DATA: Do not replace parts and do not program the vehicle. Roads can change by up to 15% every year. To ensure the best navigation experience, we do everything in our power to create the best maps. Your reports help us to detect changes in your area and keep future versions of our maps as accurate as possible. Therefore, a road map error or missing data must be reported directly to the map supplier.
B6116202020-08-31. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. SERVICE ACTION - REWORKING THE HIGH-VOLTAGE SYSTEM CONNECTOR: The sealing plugs (aka sealing grommets) on the low-voltage connector to the high-voltage battery were incorrectly mounted. The white-colored plugs seal off the individual wire chambers in the connector.
B6115202020-08-31. Service bulletin. STRUCTURE; ELECTRICAL SYSTEM. DELIVERY STOP - TRUNK LOCK SWITCH WIRING HARNESS: BMW AG has issued a Delivery Stop (effective June 5, 2020) on a small number of Model Year 2020 BMW 3 Series vehicles that were produced on March 25, 2020 and March 26,2020. The wiring harness from the Body Domain Controller (BDC) to the hotel setting switch is missing. Do not deliver to a customer, a New, Certified Pre-Owned or Used vehicle subject to a Delivery Stop, until the vehicle is repaired. Do not use or sell replacement equipment/parts subject to a Delivery Stop. The wire from the Body Domain Controller (BDC) to the wiring harness connector leading to the hotel position switch is missing.
B3406202020-08-31. Service bulletin. ELECTRICAL SYSTEM; ELECTRONIC STABILITY CONTROL:AUTOMATIC (ASC). NOISE FROM DYNAMIC STABILITY CTRL(DSC)UNIT WHEN DRIVING RAPIDLY OVER SPEED BUMP: When driving rapidly over a speed bump, the following issues may arise: 1. DSC pump noise 2. Power output delayed for 1-2 seconds DSC software application.
B6115202020-07-27. Service bulletin. ELECTRICAL SYSTEM; STRUCTURE. DELIVERY STOP: TRUNK LOCK SWITCH WIRING HARNESS: BMW AG has issued a Delivery Stop (effective June 5, 2020) on a small number of Model Year 2020 BMW 3 Series vehicles that were produced on March 25, 2020 and March 26,2020. The wiring harness from the Body Domain Controller (BDC) to the hotel setting switch is missing.
B6611202020-06-15. Service bulletin. ELECTRICAL SYSTEM. REVERSING ASSISTANT LIMITATIONS: The Reversing Assistant function is not operating to customer expectations. Some possible customer concerns are: Vehicle does not avoid objects in its path tires or wheels contact the curb reversing Assistant only works for a short distance.
B6609202020-06-15. Service bulletin. ELECTRICAL SYSTEM. SURROUND VIEW WRONG VEHICLE DISPLAYED AFTER PROGRAMMING: After programming the wrong vehicle model is displayed in the Central Information Display (CID) when the Surround View is activated.
B5113182020-06-15. Service bulletin. VISIBILITY; ELECTRICAL SYSTEM; POWER TRAIN. LIN BUS FAULTS WITH EXTERIOR REARVIEW MIRROR GLASS DAMAGE: Any or all of these conditions may be present: A. The exterior rearview mirror glass is discolored or cracked B. The power windows and folding mirrors may not operate C. One or more of the following LIN bus faults are stored in the BDC (Body Domain Controller): D90C03 LIN bus master B: short circuit - BDC D90C04 LIN bus master B: No communication - BDC D90C05 LIN bus master B: Communication failed - BDC D90D07 Operating facility switch block (LIN): Missing LIN slave D90D0A exterior rearview mirror left (LIN bus): Absent LIN slave - BDC D90D0D exterior rearview mirror right (LIN bus): Absent LIN slave - BDC 804246 exterior rearview mirror left (LIN bus): Heating or electrochrome: faulty - BDC 804256 exterior rearview mirror right (LIN bus): Heating or electrochrome: faulty - BDC 804265 exterior mirror left or right: Excess temperature - BDC 804260 exterior mirror left or right: Overvoltage - BDC 804261 exterior mirror left or right: Undervoltage - BDC Faulty exterior rearview mirror electronics have created a short on the LIN bus damaging the mirror glass and causing functional errors in power window and exterior mirror operation.
B8402202020-05-18. Service bulletin. ELECTRICAL SYSTEM. REMOTE 3D VIEW NOT AVAILABLE: Remote 3D View cannot be launched In the BMW ConnectedDrive App. Software error in the Advanced Telematics Module 2 (ATM2).
B8401202020-05-18. Service bulletin. ELECTRICAL SYSTEM. BMW CONNECTEDDRIVE SERVICES ARE NOT AVAILABLE: The BMW ConnectedDrive services are not available for an extended period. This may include: Calls in the BMW Assistance app (Concierge Service) Vehicle data and status in the BMW ConnectedDrive app Remote services Remote 3D View Real Time Traffic Information (RTTI) Weather News Software error in Advanced Telematics Module 2 (ATM2).
B6608202020-05-18. Service bulletin. ELECTRICAL SYSTEM. SERVICE ACTION - REPLACE RIGHT REAR SHORT RANGE RADAR SENSOR (SRR): The functionality of the right rear SRR sensor could be reduced which would display the Driving Assistance Check Control Message.
B6607202020-05-18. Service bulletin. ELECTRICAL SYSTEM. SERVICE ACTION - REPLACE LEFT REAR SHORT RANGE RADAR SENSOR (SRR): The functionality of the left rear SRR sensor could be reduced which would display the Driving Assistance Check Control Message.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.