Cummins Holset actuators (including the HE300VG, HE351VG, and many other part numbers) are a common failure point for Dodge and Freightliner trucks from 2007 to 2023. There are a wide range of replacement options available with varying levels of reliability, so it’s important to understand exactly why the actuator failed in the first place to avoid more problems down the road. In addition, replacing an actuator requires proper calibration for maximum efficiency. We’ll walk you through the root cause of failure, replacement options, and show you the proper methods for actuator calibration. 

What are the symptoms of a bad 6.7L turbo actuator? 

Common symptoms of a faulty HE300VG include the following: 

• Exhaust brake not functioning 

• Code U010C – No communication 

• Code P00AF – Boost control module performance 

• Code P003A – Boost control module exceeding learning limit.  

• Lack of power 

• Rough acceleration 

• Diminished fuel economy 

If you have one of these issues and are attempting to troubleshoot, be sure to check any wiring related to the actuator before replacing the actuator. If the wiring is intact, move on to the actuator itself. Failure of the actuator can result from faulty internal components – both mechanical and electrical. 

Can you drive with a bad VGT actuator? 

You can technically drive with a bad Variable Geometry Turbo (VGT) actuator, but doing so is not recommended and can lead to several issues over time. The VGT actuator controls the vanes inside the turbocharger, adjusting their position to optimize boost pressure based on engine load and speed. When the actuator malfunctions, it can cause poor throttle response, reduced power, excessive turbo lag, and increased exhaust smoke. In addition, a non-functional exhaust brake can be a major safety hazard. Continued operation under these conditions can strain the turbocharger and engine components, reduce fuel efficiency, and even damage the diesel particulate filter (DPF) due to improper exhaust flow. Therefore, while the vehicle may still be drivable, it's important to address a faulty VGT actuator promptly to avoid more costly repairs and safety issues. 

How to Fix a 6.7L Cummins Holset Turbo Actuator 

The best way to fix a broken turbo actuator is to get a remanufactured unit. This may seem contrary to conventional wisdom as a brand-new part should (in theory) be better than a used/repaired part, but that’s not the case for holset turbo actuators. There are several reasons for this, the first being that the brand-new units are likely to fail the same way as your original. The original actuators fail for a variety of reasons that trace back to the manufacturing process and design. Since brand new units have been manufactured in this same way, they are prone to the same failures. 

One alternative to getting a brand-new unit is to purchase an aftermarket actuator. These often are much cheaper than other options, because they are mass produced very cheaply. Unfortunately, the internal electronics are completely different from the original design, and the actuator does not adhere to the same quality standards. The cheap price reflects the design and manufacturing.  

Remanufactured holset actuators are the best solution to get your truck back up and running for the long haul. At Circuit Board Medics, we remanufacture 6.7L actuators to exceed the original specifications both electronically and mechanically. Not only is this a more affordable option than a brand-new part, it’s also a much more reliable and higher quality actuator, so you’re protected from future failures. 

How to Calibrate a Cummins VGT Actuator 

Anytime a turbo actuator is removed from the vehicle, it needs to be calibrated upon reinstallation. Calibration can be performed with any standard, capable tool including Cummins INSITE, Holset E-Tool, and various Snap-On, Matco, and Autel tools. For those without access to these expensive options, we offer an optional calibration tool in the shipment of your actuator for an additional rental fee. This calibration tool allows you to complete the entire installation process without a trip to the dealer or mechanic. Additionally, unlike other calibration procedures, our calibration tool will not require any changes to your custom tune. The tool will guide you step-by-step through the process to make calibration fast and simple. 

Circuit Board Medics Remanufactured Holset Actuators 

If you’re in need of a high-quality, affordable actuator replacement, you can find your exact part here. Our actuators include the installation kit and gaskets for 6.7 Liter Cummins Engines, and ship out the same day your order is placed so you’ll have everything you need to get back up and running quickly. If you have any questions about turbo actuators or would like help diagnosing or troubleshooting your vehicle, you can browse our site for more information or give us a call at (800) 547-2049. We look forward to serving you!