2020 Mercedes-Benz CLS450 Service and Repair Manual

This factory service and repair manual for the 2020 Mercedes-Benz CLS450 applies to the 4-door sedan in Base and 4Matic trim. Power comes from one engine only, and its description deserves a close read: a 3.0L inline-six, turbocharged and running on gasoline, with dual overhead camshafts and mild hybrid assistance built in. The engine and body are shared by both trims, and the manual gives engine specifications, torque values and wiring diagrams for them.

Engines covered

• 3.0L inline-six mild hybrid — DOHC, turbocharged, gasoline

Body styles covered

• 4-door sedan

Trims covered

• Base
• 4Matic

Known issues on the 2020 CLS450. Five recalls name this exact car. One covered certain cars whose communication module might have been switched off by accident during a service visit, leaving the emergency call function dead until a dealer checked and reactivated it. Another concerned certain cars in which a software error in that module's SIM card could drop the mobile network link and so disable emergency calling, fixed by an over-the-air or dealer update. Of five complaints about the 2020 CLS450, four cite the electrical system, while engine and wheels are each named once. Diagnostics and wiring diagrams in the manual cover these electrical systems.