Buy wp20255 - Genuine Cummins Turbocharger VGT Actuator HE300VG/HE351VE - wisentpartscenter.com

Description

4034175 is a Genuine Cummins electronic VGT turbocharger actuator for select Cummins ISL, ISC, and ISB applications using HE300VG / HE351VE-style variable geometry turbochargers. This actuator is not a wastegate part; it controls the VGT mechanism inside the turbo so the engine can manage boost, exhaust flow, and exhaust brake operation where equipped. Verify 4034175 by ESN, original actuator number, turbocharger assembly number, connector style, voltage, and the supersession list shown on this page. Many Cummins VGT actuators look similar, but the wrong service number can cause failed calibration, actuator communication faults, or repeat turbo diagnostics.

Purpose of the Part

The VGT actuator moves the turbo’s variable geometry mechanism based on ECM commands. By changing turbo position, the engine can build boost at low RPM, control exhaust backpressure, and maintain proper air handling under load. When the actuator cannot move, report position, or complete calibration, the turbo may stay in the wrong position and cause power, boost, or derate problems.

Issue Symptoms / When to Replace

Common signs that 4034175 may need inspection or replacement include:

  • Low boost, overboost, slow boost response, or turbo lag
  • Exhaust brake weak or not working
  • Reduced power, limp mode, or engine derate
  • Failed VGT actuator calibration / installation procedure
  • Actuator not responding during commanded sweep test
  • Turbo mechanism sticking after actuator removal
  • Corrosion, coolant intrusion, damaged pins, or harness damage at the actuator connector

Possible related Cummins VGT fault examples include Fault Code 2636 for actuator communication-related issues and Fault Code 2387 for VGT sticking-related issues. Some OBD-style applications may also show codes such as P003A, P00AF, U010C, P226C, P2262, or P0299. These codes do not prove the actuator is bad by themselves. Wiring, power supply, grounds, connector condition, stuck turbo mechanism, boost leaks, and calibration should be checked before replacing the actuator.

Brand Information

Cummins is the OEM engine manufacturer for ISC, ISL, and ISB platforms and supplies the matched air-handling and electronic control components used on these engines. For a VGT actuator, Genuine Cummins is preferred because the actuator has to communicate correctly, complete calibration, and move the turbo mechanism accurately. A cheaper actuator can cost more if it fails relearn, causes repeat derates, or adds another round of labor and downtime.

Installation Notes

Before replacing 4034175, confirm the ESN, original actuator number, turbocharger number, voltage, and supersession list shown on this page. Let the turbo area cool before removal. Disconnect battery power if required, unplug the actuator, and remove it without forcing the gear or linkage. Before installing the new actuator, check that the VGT mechanism moves freely. Installing a new actuator on a sticking turbo can damage the new unit or cause another failed calibration. Route the harness like the original, inspect pins and seals, then perform the required VGT calibration/relearn with Cummins INSITE or the proper OEM diagnostic tool. Refer to Cummins QuickServe for torque specs and final test procedure.

How to Identify an OEM Part

An OEM Cummins/Holset turbo actuator should have HOLSET branding cast into the actuator housing, not only painted or printed on the surface. Aftermarket units often do not have the HOLSET casting mark, and some may have markings painted on instead of molded/cast into the metal. Verify the casting mark, actuator label, part number, connector, and original packaging before installation.

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    Send VIN/ESN and we’ll confirm.

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Warrany & Return Information

Warranty Information

Wisent Parts offers a 180-day warranty on all parts from the date of delivery. This warranty covers orders placed directly through our website. If a part fails during this period, we’re here to help - whether it’s a replacement, repair, or refund. For full details, refer to the Warranty page.

Return Information

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