Genuine Holset VGT Turbo Actuator 5579127H – Cummins ISB 6.7L

Upgrade or replace your failing turbo actuator with this Genuine Holset VGT Turbo Actuator 5579127H, engineered specifically for Cummins ISB 6.7L diesel engines. This is a factory OEM Holset electronic variable geometry turbo (VGT) actuator — not a reman, not aftermarket — delivering precise boost control, improved throttle response, optimal fuel efficiency, and reliable exhaust brake performance.

If you're experiencing turbo actuator fault codes, loss of boost, exhaust brake issues, or limp mode, this OEM Holset actuator restores proper turbo vane positioning and performance exactly as Cummins intended.

Product Overview

• Part Number: 5579127H
• Brand: Genuine Holset
• Application: Cummins ISB 6.7L Diesel Engines
• Turbo Type: Holset Variable Geometry Turbo (VGT)
• Condition: New, Genuine OEM
• Electronic VGT actuator with factory calibration
• Direct replacement for failed or sticking turbo actuators
• Designed for optimal turbo vane control and exhaust brake function

This actuator is built to meet strict Holset manufacturing standards, ensuring durability, heat resistance, and long service life in demanding diesel applications.

Common Applications

• Cummins ISB 6.7L engines
• Ram 2500 / 3500 6.7L Cummins diesel trucks
• Medium-duty trucks and commercial applications running ISB 6.7

(Always verify by part number to ensure correct fitment.)

Cross Reference Part Numbers

This Genuine Holset 5579127H replaces and interchanges with the following OEM and supersession numbers:

5452689
5456327
5494878
549487800HX
5494878H
5494878HX
5494878NX
5494878RX
5498269
549826900H
5498269H
5498269HX
5498269NX
5498269RX
5579127
557912700H
557912700HX
5579127H
5579127HX
5641695
68232771
68232771AA
68244609
68244609AA
68307025
68307025AA
68444773AA
68445522AA
68481772
68481772AA
R8444773AA
R8481772AA

If your turbo actuator matches any of these numbers, this unit is the correct OEM replacement.