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Cummins X15 SCR 2018-2024: OEM 4394994

CUMMINS X15 SCR 2018-2024: OEM 4394994

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$4,995.00

AVAILABILITY IN STOCK
OEM NUMBER4394994
PART TYPESCR
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEX15
YEAR2018-2024
PART NUMBER4394994RM-SCR
APPLICATION NOTESVolvo 400-565 EPA21, EPA17

PRODUCT DESCRIPTION

This is a Remanufactured Tamerx SCR, Tamerx part number 4394994RM-SCR ( OEM Part Number 4394994 ). All parts are proudly remanufactured in the U.S.A. to the highest of OEM standards, and improvements are often applied to the original design in the remanufacturing process. This part is primarily made for a Cummins X15, production years 2018-2024, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

OEM NUMBERS

Primary OEM4394994
Additional OEM4394994

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490552029
WEIGHT75.00 LBS

SHIPPING OPTIONS

Ship Weight : 75.00 LBS
UPS Ground, 2nd Day Air, Next Day Air

SHIPPING POLICY

Tamerx Diesel Products ships via UPS Ground. Next day air shipping can be arranged for a reasonable price of anywhere from $50.00 - $100.00 depending on the weight of the product and your location. We will do everything we can to make sure that you get the service you need. We understand how important it is to receive your order as quickly as possible.
In most cases Tamerx Diesel Products only needs one address, as long as your product is shipping to the same location as your billing information. In order to eliminate credit card fraud, your billing information must match the credit card you provide.

The terms, conditions, and details of our warranty vary from product to product. Specific warranty details can be found below.

Tamerx Diesel Products provides a replacement warranty on all of our parts. The duration and mileage limitations of the warranty vary by product and are specified on the product's detail page/item listing.

Please note that the warranty covers replacement of the part and the cost of shipping the replacement part to you only. It does not cover any shop, labor, towing, or any similar or related costs. This is not a "money back guarantee".

If you experience a problem with your part or it is not functioning properly, the correct warranty procedure is to call us at (510) 257-1777 (8:00 AM - 5:00 PM ET Monday through Friday). Be sure to have your order number and/or other relevant order information ready so we can easily locate your order and resolve your issue as quickly as possible. From that point, we will review with you any troubleshooting steps that may need to be taken and other areas or systems that can be checked to rule out external problems contributing to your part's issue. If a replacement is determined to be necessary, we will then arrange for your replacement part to ship out ASAP and issue any necessary return shipping labels and/or documents.

As is the case for the majority of the diesel products sold on Tamerx Diesel Products, your part's warranty is active as soon as you install it. In some other cases, warranty activation is contingent upon you sending us your core (i.e., your old part). Tamerx Diesel Products will provide you a return shipping label for parts that have a warranty with a core return condition. When we have received your core return, the part's warranty coverage begins. We reserve the right to void the product warranty if your core is not received within the allotted time, or if it isn't received at all. If the warranty for the diesel part you are purchasing has a core return requirement, it will be clearly noted on the product detail page/item listing.

What is a Core Charge?

A core charge (also called "core deposit") is similar to the deposit you might pay for a can or bottle of soda and is a standard requirement in the auto parts industry. For example, in many states, to promote recycling, you pay a deposit when you purchase a can of soda and receive your deposit back when you return the empty can. Many automotive parts have a core charge, or core price, that works in essentially the same way as a soda can deposit.

30 Day Core Charge Hold

You authorize Tamerx Diesel Products, to hold your credit card for the specified core charge amount and that you agree to return your core with 30 days of receiving the purchased part. When we have received your core return, the hold is released and the core charge payment is canceled.

The customer, or parts buyer, is responsible for any shipping costs associated with core returns unless otherwise specified in the product listing/detail page. Tamerx Diesel Products offers prepaid UPS shipping labels (SKU numbers UPS-CR1 and UPS-CR2) for use in returning your core that are available for purchase on our website during your shopping/order process.

The shipping label you will need to use for the core return is dependent upon what part you are purchasing. UPS-CR1 is good for cores weighing up to 20 pounds. UPS-CR2 is appropriate for shipping cores weighing 21 pounds or more. You must include enough information with the core return that clearly identifies it as a.) a Core Return, and b.) contains enough information we can use to clearly associate the core return with your order. Including a copy of the invoice or packing slip that came with the original shipment, clearly marked "Core Return", is ideal. Alternately, you can include a note marked as "Core Return" that includes your order number, full name and address, and phone number or other contact information. Failure to include this information with your returned core will most likely delay any due core credit being issued and/or delay any applicable warranty activation. Core returns need to be for the exact part purchased and cannot be damaged. Substituting another part in place of the part you have purchased is not acceptable.

All fluids must be drained.

If you have purchased a set or a parts package, you will need to return cores for all components of the set. For example, if you have purchaed a high pressure oil pump with an IPR valve, you will need to return both HPOP and IPR valve cores to receive proper credit. If you have purchased an EGR cooler/EGR valve package, your core return must consist of an EGR cooler core and an EGR valve core, or core credit will not be given.

Core Charges are often mandated by state legislature, and, as such, the actual core charge and taxes on the charge may vary depending on the state in which you buy your part. The Tamerx Diesel Products core charge presented to you online today with your item is representative of the most common core charge.


Transform your emissions system with the Cummins X15 SCR 2018–2024: OEM 4394994, designed to lower harmful NOx output while enhancing engine efficiency. This genuine SCR module meets exact OEM specifications for a secure fit and dependable durability in demanding heavy-duty applications. Built to handle long hauls and tough routes, it helps keep your rig compliant with emissions standards without compromising performance. Choose a solution that keeps your X15 running cleaner and stronger mile after mile.

FITMENT CHART

YEARMAKEENGINE(S)
2018Cummins X15
2019Cummins X15
2020Cummins X15
2021Cummins X15
2022Cummins X15
2023Cummins X15
2024Cummins X15

PEOPLE ALSO ASKS | BLOG(S)

Diesel emission systems are under increasing scrutiny as regulations tighten across the trucking industry. For owners of trucks with Cummins X15 engines, the Cummins X15 SCR 2018–2024: OEM 4394994 plays a central role in reducing harmful nitrogen oxides (NOx) and ensuring clean operation. Understanding how this SCR unit enhances your emission aftertreatment performance can help you make smarter maintenance decisions and extend the life of your truck’s system.

  • Designed to fit Cummins X15 engines from 2018 through 2024, the OEM 4394994 SCR unit integrates precisely into the emission aftertreatment setup for accurate function.

  • The SCR (Selective Catalytic Reduction) system introduces diesel exhaust fluid (DEF) into the exhaust stream, where a chemical reaction transforms NOx into harmless nitrogen and water vapor.

  • Installing the genuine OEM 4394994 SCR ensures proper compatibility with your engine’s emission control system, helping minimize diagnostic trouble codes and unnecessary service interruptions.

  • A reliable SCR unit supports accurate DEF dosing, which promotes efficient NOx reduction and helps prevent excessive fluid usage that can occur with ill-fitting parts.

  • Maintaining an effective SCR contributes to smoother communication between emission sensors and the engine control module, reducing false warnings that could lead to downtime.

  • Common service indicators, such as repeated emission alerts or DEF dosing errors, may signal that your SCR unit needs inspection or replacement.

  • Built to Cummins’ exact manufacturing standards, this SCR module withstands the heat, vibration, and challenging conditions typical of highway and regional usage.

  • Installation is straightforward for professional technicians and fleet maintenance teams during scheduled emission system servicing or parts replacement.

Selecting the Cummins X15 SCR 2018–2024: OEM 4394994 from Tamerx Diesel Parts gives you confidence that your emission control system is equipped with a quality, engine-specific component. With the right SCR unit in place and attentive system care, your truck can maintain emission compliance and reliable operation mile after mile.

The Selective Catalytic Reduction (SCR) system is built for long-term durability, but certain conditions can lead to contamination or reduced efficiency over time. While routine maintenance focuses on DEF quality and related components, there are situations where professional cleaning may be necessary. Knowing when to seek professional service can help prevent permanent damage and costly replacement.

  • Persistent catalyst efficiency fault codes that remain after repairing sensors and DEF-related issues may indicate internal buildup.

  • Oil or coolant contamination from engine leaks can leave deposits inside the SCR that require specialized cleaning.

  • Excessive soot exposure from unresolved Diesel Particulate Filter (DPF) problems may affect exhaust flow and catalyst performance.

  • Repeated engine derate conditions without a clear sensor or electrical fault may point to restricted catalyst function.

  • Visible DEF crystallization in related components, combined with ongoing SCR performance issues, may require professional inspection.

  • High mileage combined with declining emissions performance can sometimes justify deeper cleaning evaluation.

Professional cleaning services use specialized equipment designed to safely remove certain types of buildup without damaging the catalyst substrate. However, severe contamination or internal damage may still require replacement. Prompt diagnosis and early intervention can help determine whether cleaning is sufficient or if more extensive repairs are needed.

If conversion efficiency drops, NOx levels in the exhaust can increase, potentially causing emissions errors or test failures. Diagnostic scans can help locate the issue before it worsens.

Yes, very cold weather can affect DEF fluid condition and flow, while extreme heat can impact system components. Proper DEF storage and monitoring help maintain performance across climates.

Ignoring warning signs can lead to escalating repair costs and potential emissions test failures. Addressing problems early can help avoid expensive aftertreatment system damage.

Keeping the SCR system in good condition helps ensure the vehicle continues to meet emissions standards for many miles. Consistent operation also helps avoid unexpected vehicle derates or performance issues.

Cummins SCRs