M274 engine — Mercedes-Benz 2.0 (2L I4 turbo direct injection; mechanically belt-driven coolant pump with vacuum-controlled flow valve)

The M274 is a 2-litre four-cylinder turbocharged petrol from Mercedes-Benz with direct injection, built 2012-2019. An unusual detail is its mechanically belt-driven coolant pump with a vacuum-controlled flow valve, which governs coolant flow through the engine rather than leaving the pump running flat out. It is listed here for the C300 W205, the E300 and the GLC300. No recurring faults are documented here for this engine, and this page carries no torque figures, so it serves as an identification page rather than a repair reference. When working on one, check service history, oil grade and coolant condition first, and treat the vacuum supply to the coolant pump valve as part of any warm-up or overheating diagnosis.

Nothing specific is recorded for this engine here, so follow good general practice. For overheating or a slow warm-up, check the coolant level and condition, then the vacuum supply and control of the coolant pump flow valve. For running faults, read fault codes and live data before replacing parts, and confirm oil grade and change history.

Check first

• Vacuum line and control to the coolant pump flow valve.
• Drive belt condition, as it also turns the coolant pump.
• Coolant level and condition on warm-up or temperature complaints.
• Oil grade and change history on any running complaint.

Engine overview

Vehicles with this engine

Workshop procedures for this engine

Step-by-step procedures from the workshop database.

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