Buy 6473311 - Genuine Cummins Turbocharger Actuator for ISB6.7 EPA24 - wisentpartscenter.com

Description

6473311 is a Genuine Cummins turbocharger actuator kit for EPA24 Cummins ISB/QSB 6.7L VGT turbo applications. The actuator controls the turbo vane position so the ECM can manage boost response, exhaust flow, and exhaust brake operation. Verify 6473311 by ESN, original actuator number, turbocharger number, connector style, and the cross-reference / supersession list shown on this page. This is an electronic VGT actuator, so correct matching and calibration matter. A wrong or low-quality actuator can cause failed relearn, communication faults, boost-control codes, or repeat derate issues after installation.

Purpose of the Part

The turbo actuator moves the variable-geometry turbo mechanism based on ECM commands. This allows the engine to build boost at low RPM, control exhaust flow, and support exhaust brake function. When the actuator cannot move correctly or cannot report position back to the ECM, the truck may lose boost control, run in derate, or fail the VGT calibration procedure.

Issue Symptoms / When to Replace

Common signs that 6473311 may need inspection or replacement include:

  • Exhaust brake inoperative or weak
  • Low boost, overboost, turbo lag, or unstable boost response
  • Reduced power, limp mode, or emissions/engine derate
  • Failed VGT actuator calibration or relearn
  • Actuator not responding during commanded sweep test
  • Damaged connector, coolant intrusion, corrosion, or harness issues at the actuator
  • Turbo vanes stuck or binding after actuator removal

Possible related 6.7L Cummins VGT codes may include P003A, P00AF, U010C, P226C, P2262, and P0299. I did not find a reliable EPA24-specific fault-code document for 6473311, so confirm codes through Cummins INSITE / QuickServe before replacing the actuator. These codes can also be caused by wiring, stuck turbo vanes, boost leaks, calibration issues, or a failed turbocharger.

Brand Information

Cummins is the OEM engine manufacturer for the ISB/QSB 6.7L platform and supplies the matching air-handling and electronic control parts used on these engines. For a turbo actuator, Genuine Cummins is preferred because the actuator must communicate correctly, complete calibration, and control vane position accurately.

Installation Notes

Before replacing 6473311, confirm the ESN, original actuator number, turbocharger number, and supersession list shown on this page. Let the exhaust and actuator area cool before removal. Inspect the turbo vane lever for free movement before installing the new actuator; do not install a new actuator on a sticking turbo. Route the harness the same way as the original and check connector pins for corrosion or coolant damage. After installation, perform the required VGT actuator calibration/relearn with Cummins INSITE or the proper OEM diagnostic tool. Refer to Cummins QuickServe for torque specs, coolant handling if required, 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.

Technical Documents

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Warranty Information

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Cummins

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