
Cummins ISL SCR Filter 2013-2018: OEM 4376445
CUMMINS ISL SCR FILTER 2013-2018: OEM 4376445

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY
1M MILES OR 1 YEAR
PRODUCT DESCRIPTION
This is a Genuine, Cummins SCR Filter, Cummins part number 4376645 ( OEM Part Number 4376445 ).This part is primarily made for a Cummins ISL, production years 2013-2018, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here
OEM NUMBERS
| Primary OEM | 4376445 |
| Additional OEM | 4376445 |
ADDITIONAL DETAILS
| CONDITION | Genuine |
| UPC / Barcode | 00840490543171 |
| WEIGHT | 33.00 LBS |
SHIPPING OPTIONS
Ship Weight : 33.00 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.
Maintain proper emissions system operation with the Cummins ISL SCR Filter 2013–2018, OEM Part Number 4376445. Designed for compatibility with select Cummins ISL engine applications, this SCR filter works within the selective catalytic reduction system to help reduce NOx emissions through controlled DEF treatment. Manufactured to meet OEM specifications, it ensures accurate fitment and dependable durability in demanding on-road and vocational environments. A restricted or failing SCR filter can result in warning lights, derate conditions, or increased exhaust system concerns, making timely replacement essential. Tamerx Diesel Products LLC provides reliable diesel aftertreatment components to help keep your Cummins ISL engine operating cleanly and consistently.
FITMENT CHART
| YEAR | MAKE | ENGINE(S) | ||||
|---|---|---|---|---|---|---|
| 2013 | Cummins | ISL | ||||
| 2014 | Cummins | ISL | ||||
| 2015 | Cummins | ISL | ||||
| 2016 | Cummins | ISL | ||||
| 2017 | Cummins | ISL | ||||
| 2018 | Cummins | ISL | ||||
PEOPLE ALSO ASKS | BLOG(S)
Effective emissions control is essential in modern diesel engines, and the Cummins ISL SCR Filter OEM 4376445 plays a central role in that system. Designed for 2013–2018 Cummins ISL applications, this component is part of the Selective Catalytic Reduction (SCR) aftertreatment system.
The primary role of the SCR filter is to reduce nitrogen oxide (NOx) emissions in the exhaust stream. It works in conjunction with Diesel Exhaust Fluid (DEF) to convert harmful NOx gases into harmless nitrogen and water vapor before the exhaust exits the system.
The Cummins ISL SCR Filter OEM 4376445 is responsible for:
- Supporting NOx reduction within the exhaust system
- Providing a catalyst-coated substrate for chemical reactions
- Working with the DEF doser injector
- Maintaining proper exhaust flow
- Assisting in emissions compliance
Inside the SCR filter is a honeycomb-style catalyst substrate coated with materials that promote chemical reactions. When DEF is injected upstream, it decomposes into ammonia. As exhaust gases pass through the SCR catalyst, ammonia reacts with NOx and converts it into nitrogen and water vapor.
The OEM 4376445 SCR filter is engineered specifically for Cummins ISL engines, ensuring proper fitment and integration with sensors, DEF components, and control modules.
When functioning correctly, the SCR filter plays a critical role in maintaining emissions compliance, supporting clean exhaust output, and ensuring dependable engine operation.
The SCR (Selective Catalytic Reduction) filter works with Diesel Exhaust Fluid (DEF) to reduce harmful NOx emissions. Because it relies on precise chemical reactions and proper exhaust temperatures, contamination is the most common reason it fails.
The main cause of SCR filter failure is DEF contamination and improper dosing.
When low-quality, expired, or contaminated DEF is introduced into the system, it can create deposits that coat the catalyst surface. Over time, these deposits reduce the filter’s ability to convert emissions effectively.
Other contributing factors include:
- Crystallized DEF buildup
- Faulty NOx sensors
- Malfunctioning DEF doser injector
- Exhaust leaks
- Excessive soot from engine problems
- Prolonged overheating
Improper dosing can also damage the SCR filter. If too much or too little DEF is injected, the catalyst may not operate within its intended range, leading to efficiency fault codes.
Engine issues such as faulty injectors or EGR problems can increase soot levels, placing additional strain on the entire aftertreatment system.
Routine maintenance, using fresh DEF that meets ISO standards, and addressing warning lights quickly can significantly reduce the risk of premature SCR filter failure and help maintain proper emissions system function.
Yes, the Cummins 4376445 SCR Filter is designed to work with the engine’s factory emissions sensors and control systems.
Yes, professional installation helps ensure proper sealing and sensor connections in the aftertreatment system.
Yes, a clogged SCR Filter can trigger diagnostic codes and impact emissions system readings.
Using the correct OEM 4376445 SCR Filter helps maintain proper emissions control and supported aftertreatment system functionality.





































