2020 BMW M8 Gran Coupe Service and Repair Manual

This factory service and repair manual for the 2020 BMW M8 Gran Coupe covers a four-door sedan sold as Base or Competition, both powered by the same turbocharged 4.4L DOHC V8 on gasoline. With one engine across the range, the powertrain chapters carry a single set of clearances, torque values and diagnostic thresholds, and what distinguishes the two specifications sits in the body and equipment material. Procedures are arranged by system rather than by trim, so a job starts in the same place either way.

Engines covered

• 4.4L V8 — DOHC, turbocharged, gasoline

Body styles covered

• 4-door sedan

Trims covered

• Base
• Competition

Known issues on the 2020 M8 Gran Coupe. Two recalls stand on the federal record for this model year. In one, sensors in the front seat belt buckles can read a belted occupant as unbelted, which may cause the air bags and belt pretensioners to deploy improperly in a crash. In the other, a damaged transmission wiring harness can short, dropping the transmission into neutral and cutting drive without warning. Both are electrical faults at root, and the wiring diagrams, connector-level test procedures and control unit diagnostics in this manual cover those circuits.