Turbocharger Actuator 6NW009420 – Mercedes Turbo Boost Control Valve

The turbocharger actuator (OEM 6NW009420 / G-277 / 712120) is an electronic control unit that plays a crucial role in regulating boost pressure on turbocharged diesel engines by precisely controlling the waste-gate or variable geometry vanes in the turbocharger. When functioning correctly, this actuator ensures optimum turbo boost delivery across the engine’s RPM range, resulting in smoother acceleration, improved torque response and better fuel efficiency. A failing actuator can lead to loss of power, inconsistent boost, turbo-related fault codes and limp-home mode, making timely replacement essential for dependable performance and drivability.

OEM Number: 6420901880, 6420902080, 6420903080, 6420904780, 6420904980, 6NW009420, 6NW009420-20, G-277, 6420901080, A6420901080

Product Details:

Number of pins : 5-pin connector

Operating Mode : Electronic

Charge Type : Electrically controlled actuator

Quantity : 1 

Our SKU: TMG-2776NW009420_94

All our Turbocharger Actuator are OEM quality and reliable after market car parts. This Turbocharger Actuator is specifically compatible with Mercedes-Benz: C-Class, CLK, CLS, E-Class, G-Class, GL-Class, GLK-Class, M-Class, R-Class, S-Class, Sprinter 3-T, Sprinter 3.5-T, Sprinter 4.6-T, Sprinter 5-T, Viano, Vito, Vito / Mixto, .

Please use our make-model-year tool to check this part's compatibility with your vehicle. However, please note that our tool is for reference only and we recommend that you check the part number on your old unit prior to purchasing.

If you are still not sure about the compatibility of this part to your vehicle, please supply us with the VIN number or Reg number in our live chat or contact form! You can also find details on our purchasing & shipping guide here.

Key Benefits

Accurate Turbo Boost Control
The actuator electronically adjusts the turbo waste-gate or variable vanes to maintain correct boost pressure as commanded by the engine control unit (ECU), supporting efficient combustion and engine responsiveness.

Restores Engine Power & Response
By ensuring the turbocharger operates at its designed boost levels, this actuator helps restore strong acceleration, smooth throttle response and improved mid-range performance.

OEM Reference Compatibility (6NW009420 / G-277)
Designed to match original equipment turbo actuator part numbers such as 6NW009420, G-277 and 712120, enabling a direct replacement on vehicles that originally used this specification.

Reduces Faults & Limp Mode Issues
Replacing a worn or erratic actuator can clear boost control faults and reduce occurrences of limp-home mode triggered by turbocharger malfunction codes.

Broad Vehicle Application
Commonly used on Mercedes-Benz turbocharged diesel models equipped with OM642/OM646/OM611 engines, including E-Class, C-Class, ML, GL, R-Class, Viano, Vito and Sprinter applications — as well as some Jeep and Dodge vehicles that share the OM642 turbo system architecture.

Frequently Asked Questions (FAQs)

Q: What does a turbocharger actuator do?
A turbocharger actuator electronically controls the position of the internal waste-gate or variable geometry vanes; by doing so, it regulates turbo boost pressure to match engine demands and maintain optimal performance.

Q: What are symptoms of a failing turbo actuator?
Common signs include reduced engine power, delayed or weak acceleration, black smoke on acceleration, turbo fault codes (e.g., boost pressure faults), and the vehicle entering limp-home mode.

Q: Which vehicles commonly use part number 6NW009420?
This actuator is found on many Mercedes-Benz diesel turbo systems such as the E-Class, C-Class, GL, ML, R-Class, Viano, Vito and Sprinter with the OM642 engine family; it’s also compatible with some Jeep, Dodge and Chrysler models that share similar turbo components. Always confirm fitment using your OEM number before ordering.

Q: Is this a direct replacement unit?
Yes — when matched to the correct original part codes (e.g., 6NW009420, G-277, 712120), this actuator installs as a direct replacement without major modification.

Q: Does the actuator require calibration or programming?
In most cases, replacing the actuator is a plug-in replacement, but on some vehicles a diagnostic reset or ECU relearn may be needed to clear fault codes and regenerate correct boost control mapping.