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Service bulletins for the 2020 BMW Z4

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.

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

By type

By component

Only bulletins with component: Glass, wipers and mirrors are shown. Show all

Bulletins, newest first
B6404222024-03-02. Service bulletin. ELECTRICAL SYSTEM; VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM. An interference noise (groaning noise) can be heard from within the heating and air-conditioning unit in thecenter of the instrument panel. The groaning noise always occurs when either a ventilation flap, air stratification flap or the recirculated airflap moves to a different position. Due to the complex design of the heating and air-conditioning unit, the kinematics causing it (top or bottom,left or right) may not be able to be precisely located. Depending on the vehicle model, the number of servomotors (and the associated kinematics unit) varies.Various models use either 2 or 3 servomotors.
B5108192024-02-01. Service bulletin. VISIBILITY:POWER WINDOW DEVICES AND CONTROLS; ELECTRICAL SYSTEM. The basic conditions for initializing the power windows are not met.
B6102232023-03-20. Service bulletin. EQUIPMENT; VISIBILITY. Check control message (CCM) 183 Windscreen wiper malfunction is displayed.
B6112222022-12-12. Service bulletin. VISIBILITY. After opening the vehicle with the radio remote control and changing the profile, the exterior mirror settings are lost.
B6404222022-10-31. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM. An interference noise (groaning noise) can be heard from within the heating and air-conditioning unit in the center of the instrument panel.
B6403212021-12-20. Service bulletin. EQUIPMENT; VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM. After replacing the microfilter during a previous service, the customer notices that the ventilation system airflow rate is noticeably less.
B5402212021-05-24. Service bulletin. VISIBILITY:SUN/MOON ROOF ASSEMBLY; ELECTRICAL SYSTEM:SOFTWARE. CHECK CONTROL MESSAGE "ROOF NOT LOCKED": A check control message is displayed stating "Roof not locked", although the roof is securely locked.
B5113182021-03-15. Service bulletin. VISIBILITY. LIN BUS FAULTS WITH EXTERIOR REARVIEW MIRROR GLASS DAMAGE: 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.
B6123152020-12-21. Service bulletin. VISIBILITY:WINDSHIELD WIPER/WASHER; EQUIPMENT. Low Washer Fluid Warning Light is illuminated when the Washer Fluid Tank is Full: Low Washer Fluid Warning Light is illuminated when the Washer Fluid Tank is Full.There are no faults stored in the system for the washer fluid level switch.
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.
B5110202020-04-20. Service bulletin. BACK OVER PREVENTION; VISIBILITY. INTERFERENCE NOISE WHEN FOLDING THE OUTSIDE MIRRORS: Interference noises (creaking groaning clicking) may be present when folding the side view mirrors in or out. Excessive friction on the pivoting mechanism of the side view mirror hinge.
B5113182020-03-16. Service bulletin. VISIBILITY. LIN BUS FAULTS WITH EXTERIOR REARVIEW MIRROR GLASS DAMAGE: This Service Information Bulletin (Revision 2) replaces SI B51 13 18 dated February 2020. The exterior rearview mirror glass is discolored or cracked. The power windows and folding mirrors may not operate.

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