NHTSA Owner Complaint Log
This page lists owner-reported complaints filed with NHTSA for the 2020 BMW M5. Complaints are unverified consumer reports submitted to NHTSA and do not by themselves prove a defect or defect rate.
Coolant expansion tank is leaking on fuel injectors, coils and plugs on engine below causing ‘drivetrain malfunction’ which puts vehicle into Limp Mode. Car can begin to shudder, misfire and stall. BMW has an SIB on the expansion tank, but has done nothing to address the components underneath that get damaged. Feel free to Google BMW M5 coolant expansion tank issues.
Data synced from NHTSA on May 4, 2026