Service bulletins for the 2020 BMW M4
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.
48 on file from NHTSA, as of 2026-10-19.
By type
By component
Only bulletins with component: Heating and air conditioning are shown. Show all
| B640422 | 2022-10-31. 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. |
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| B640613 | 2021-02-01. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER; EQUIPMENT; ELECTRICAL SYSTEM. ?A/C COOLING INTERMITTENT REDUCTION OF AIR FLOW: Customer may complain of reduced air flow when the air conditioning system is operated for an extended time, usually longer than 30 minutes. The evaporator starts to freeze up. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.