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Service bulletins for the 2018 BMW 640i

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.

279 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
B6104192019-05-20. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY. VEHICLE DOES NOT START BATTERY TOTALLY DISCHARGED This Service Information bulletin replaces SI B61 04 19 dated March 2019.
B6611192019-04-22. Service bulletin. ELECTRICAL SYSTEM. NIGHT VISION 3: INTERNAL SOFTWARE ERROR FAULT. During vehicle diagnosis of an unrelated issue the following erroneous fault may be stored in the Night Vision 3 control unit.
B6104192019-04-22. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY. THE VEHICLE DOES NOT START BATTERY TOTALLY DISCHARGED. The customer's vehicle does not start due to a totally discharged battery.
B3403192019-04-22. Service bulletin. ELECTRICAL SYSTEM; PARKING BRAKE; SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:WHEEL SPEED SENSOR/TONE RING; SERVICE BRAKES, AIR:ANTILOCK:WHEEL SPEED SENSOR. HUMMING/RUMBLING NOISES AFTER OPENING THE DOOR. After waking up/unlocking and entering the vehicle may cause a humming/rumbling noise to occur.
B6619182019-02-25. Service bulletin. ELECTRICAL SYSTEM. FAULT CODE 804417 CAUSED BY THE REMOTE KEY. When a short test is performed as part of a workshop visit for an unrelated situation.
B6304182019-02-25. Service bulletin. EXTERIOR LIGHTING; ELECTRICAL SYSTEM. DAYTIME RUNNING LIGHT IS DIM OR DISCOLORED. One or more of the LED daytime running lights are dim or discolored. The connection between the LED module and light tube inside the headlight is damaged.
B5205182019-01-07. Service bulletin. ELECTRICAL SYSTEM. SEAT MEMORY SWITCH SPORADICALLY NOT FUNCTIONING. Selecting one of the saved seat positions (via the memory seat position switch on the door panel), fails to work. A saved seat position cannot be retrieved. The memory function works again after a terminal change or backrest width adjustment. Note: Manual seat adjustment using the button for forward/back seat adjustment still works. Software error in the seat module.
B5107182019-01-07. Service bulletin. ELECTRICAL SYSTEM. POWER WINDOWS WILL NOT INITIALIZE AFTER WINDOW LIFT MOTOR REPLACEMENT. The windows are unable to be initialized after replacement of a window lift motor. This only affects vehicles with I-level S15A-18-03-511 or lower. For vehicles with I-level S15A-18-03-511 or lower, there is a software error in the BDC (Body Domain Controller) that affects initialization of replacement window lift motor electronics.
B8406162018-12-03. Service bulletin. ELECTRICAL SYSTEM. ?BMW ONLINE NON-FUNCTIONAL: CHECK ICC-ID IN ACCOUNT. BMW Online/BMW ConnectedDrive not functional. Vehicle and service cockpit have different ICC-ID's (Integrated Circuit Card Identifier).
B8402142018-12-03. Service bulletin. ELECTRICAL SYSTEM. ?CONNECTEDDRIVE/BMW ASSIST SYSTEM DIAGNOSIS INFORMATION. ConnectedDrive/BMW Assist features are partially or completely inoperative. This Service Information bulletin is being published because vehicles are down for an extended period of time when researching system failures with ConnectedDrive or BMW Assist. This Service Information bulletin will assist you both in identifying the issue and providing technical support. CAUSE Not enough information is available for BMW NA engineers to assist the technician in diagnosing the root cause.
B6620172018-12-03. Service bulletin. ELECTRICAL SYSTEM. ?DISPLAY KEY IS NON-FUNCTIONAL. Display key is non-functional. Display key cannot be charged or switched on. Possibly defective display key.
B1207182018-11-26. Service bulletin. ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING. DME FC 1C0102 IS STORED WITH NO OTHER RELATED FAULTS. The following fault has been stored in the Digital Motor electronics (DME) fault memory with no other engine oil pressure faults stored: ??1C0102 - oil pressure control, plausibility, static: Pressure too low This fault will not cause a customer complaint or a Check Control Message (CCM). The fault is typically identified during unrelated diagnostics. Software error in the Digital Motor Electronics (DME) may cause the fault code to be erroneously stored. Only Integration level 17-11-5xx and higher are affected.
B7204172018-11-26. Service bulletin. AIR BAGS; ELECTRICAL SYSTEM; SEAT BELTS. FALSE WARNINGS THAT THE FRONT PASSENGER SEAT IS OCCUPIED WITHOUT THE SEAT BELT BUCKLED. Acoustic and visual warnings indicate that the front passenger seat is occupied and the seat belt is not fastened, when the seat is actually unoccupied. If the situation is currently present, sit in the seat and move the seat to a different position then the POL (Passenger Occupancy Light) light will function correctly. In some cases the Air bag Warning Light was illuminated. Advanced Crash Safety Module (ACSM) fault "930A1C - Front passenger seat occupancy detection transmitting fault (moisture)" is stored. 1. Electronics (for example smart phones or laptops) are connected to the USB charging port or cigarette lighter and placed on the seat. 2. The seat was wet (e.g. very high humidity, spilled liquids or rain). 3. Faulty plug connection to Evaluation Electronics CIS (Capacitive Interior Sensing). 4. Excessive spacing between seat mat sensor signal wires and their grounding shield sleeve. * Drying the seat mat due to moisture. * If there is no moisture, secure loose cables and install 2 cable ties * If the 2 cables ties are already installed properly, replace the seat mat * Statement added to SI - do not replace the CIS electronics or the ACSM module for this siutation.
B6208182018-10-09. Service bulletin. ELECTRICAL SYSTEM. INSTRUMENT CLUSTER DISPLAY SHAKES-SHIFTS TO THE LEFT: The Instrument cluster intermittently flickers, shakes and has shifted to the left.
B6206182018-10-09. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. FUEL GAUGE INCORRECTLY DISPLAYING LOW FUEL LEVEL AFTER VEHICLE IS REFUELED: Occasionally, on restart after refueling, the fuel gauge will display the fuel level as low (minimum) and the range display will be at an implausible (maximum) value.
B6205182018-10-09. Service bulletin. ELECTRICAL SYSTEM. HEADS UP DISPLAY SPORADICALLY INOPERATIVE: Fault memory entry ÒB7F6E4 HUD: Fault in display backlighting is stored in the instrument cluster.
B5205182018-10-09. Service bulletin. SEATS; ELECTRICAL SYSTEM. SEAT MEMORY SWITCH SPORADICALLY NOT FUNCTIONING: Selecting one of the saved seat positions (via the memory seat position switch on the door panel), fails to work.
B8408182018-08-06. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; ELECTRICAL SYSTEM. HEAD UNIT HIGH 2 RESET WHILE BLUETOOTH IS CONNECTED: The following event may cause an unexpected reset of the Head Unit High 2 (NBT EVO) when:
B8406162018-08-06. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; ELECTRICAL SYSTEM:SOFTWARE. BMW ONLINE NON-FUNCTIONAL: CHECK ICC-ID IN ACCOUNT: BMW Online/BMW ConnectedDrive not functional.
B6205182018-08-06. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. HEADS UP DISPLAY SPORADICALLY INOPERATIVE: Fault memory entry ÒB7F6E4 HUD: Fault in display backlighting Òis stored in the instrument cluster.
B6144172018-08-06. Service bulletin. VISIBILITY; ELECTRICAL SYSTEM. WINDOW WILL NOT CLOSE AFTER REPEATED BUTTON PUSHES: One or more power windows stops operating after repeated button pushes. This usually occurs when trying to close the window.
B6605182018-05-21. Service bulletin. ELECTRICAL SYSTEM. COMFORT ACCESS SPORADICALLY INACTIVE VIA DOOR HANDLE: Sporadically, CA (Comfort Access) locking or unlocking of the vehicle does not work via the door handles.
B6513162018-05-21. Service bulletin. EQUIPMENT:ELECTRICAL:NAVIGATIONAL SYSTEM(GLOBAL POSITIONING SYSTEM); EQUIPMENT; ELECTRICAL SYSTEM:SOFTWARE. NBT-EVO Head Unit Cannot be Swapped between Vehicles for Testing: If either the NBT-EVO head unit or Body Domain Controller (BDC) are swapped into a different vehicle they will cause the head unit NBT-EVO to enter a locked mode once it recognizes a different VIN.
B6212152018-05-21. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. INSTRUMENT CLUSTER OUTSIDE TEMPERATURE DISPLAY IMPLAUSIBLE: In the Instrument Cluster (Kombi) display you may observe an implausible outside temperature reading.
B6122172018-05-21. Service bulletin. ELECTRICAL SYSTEM. DIAGNOSTIC COMMUNICATION WITH FLEXRAY CONTROL MODULES NOT POSSIBLE: There are no customer complaints associated with this issue.

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