Failure mode - Mercedes-Benz 3.0L V6 Diesel (Sprinter 2007-2022)

Intake port shutoff (swirl) flap motor and stuck flaps

Reliability tier: aggregated - verify before ordering, see /disclosure/

Symptoms

check engine light with P2006/P2015-range intake flap codes
reduced power / limp episodes, rough or uneven idle
worst on vans that sit for days/weeks between runs (campers, seasonal fleet units)

Compare with the other causes of the same sign on this engine: loss of power, limp mode or derate (4 causes) · misfire, rough idle, hesitation or surging (4 causes)

Root cause

The OM642 intake manifold carries port shutoff (swirl) flaps actuated by an electric motor and linkage rods; carbon buildup and a tired actuator stick the flaps. Community and vendor guides document the motor/flap repair and the rod-kit fixes; oil mist from nearby leaks (the oil cooler stack sits above the intake area) accelerates the coking.

Diagnosis

read the intake flap DTCs and command the actuator with a scan tool - listen for the motor running
inspect the linkage rods and flap levers through the manifold opening for carbon lock
check for oil contamination sources (coolant stack, cam covers) before replacing the actuator alone

Fixes

intake flap actuator / linkage repair or manifold cleaning; some owners fit rod repair kits - the flaps are repaired to stock function, never deleted ()

intake-manifold - more than one option: OM642 Intake Manifold Gasket (642-141-05-80), OM642 Intake Manifold with Port Shutoff Flaps (NCV3, 642-090-06-37), OM642 Intake Manifold, VS30 (642-090-09-00)

Prevalence

common