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Cummins DOC Filter 2021-2026: OEM 5506239

CUMMINS DOC FILTER 2021-2026: OEM 5506239

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$3,850.00

CORE CHARGE:

$1,000.00
iCORE DISCLAIMER: The CORE charge is a 30 day hold and will not be processed as long as the CORE is returned within 30 days. If you do not have a CORE or fail to return the CORE within 30 days, the CORE charge hold amount will be processed at that time.

AVAILABILITY IN STOCK
OEM NUMBER5506239
PART TYPEDOC Filter
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEQSB 4.5L, B6.7
YEAR2021-2026
PART NUMBER5506239RM-DOC
APPLICATION NOTESStage 5
ADDITIONAL NOTESInlet Catalyst

PRODUCT DESCRIPTION

This is a Remanufactured Tamerx DOC Filter, Tamerx part number 5506239RM-DOC ( OEM Part Number 5506239 ). 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 , production years 2021-2026, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

Additional Notes: Inlet Catalyst

OEM NUMBERS

Primary OEM5506239
Additional OEM5506239

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490554245
WEIGHT52.00 LBS

SHIPPING OPTIONS

Ship Weight : 52.00 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.


Designed to support efficient exhaust treatment, the Cummins DOC Filter 2021–2026 (OEM 5506239) helps manage emissions at the oxidation stage of the aftertreatment system. This component plays a key role in converting exhaust gases before they move further through the system. Built to OEM standards, it ensures proper fitment and dependable compatibility for the listed applications. Choosing the correct DOC filter helps maintain consistent emissions system function and reliable operation

FITMENT CHART

YEARMAKEENGINE(S)
2021Cummins QSB 4.5L B6.7
2022Cummins QSB 4.5L B6.7
2023Cummins QSB 4.5L B6.7
2024Cummins QSB 4.5L B6.7
2025Cummins QSB 4.5L B6.7
2026Cummins QSB 4.5L B6.7

PEOPLE ALSO ASKS | BLOG(S)

Clean exhaust starts with the right foundation—and the DOC (Diesel Oxidation Catalyst) filter is where it all begins. Positioned at the front of the aftertreatment system, this component immediately works on breaking down harmful gases as they leave the engine. In Cummins applications, the DOC filter plays a crucial role in preparing exhaust flow, supporting downstream components, and keeping the entire emissions system operating efficiently.

  • Initiates the Emissions Treatment Process
    The DOC is the first stage in the aftertreatment system, treating exhaust gases right after they exit the engine to begin reducing pollutants.
  • Breaks Down Harmful Gases Through Oxidation
    It converts carbon monoxide and unburned hydrocarbons into carbon dioxide and water vapor, helping reduce toxic emissions early in the exhaust cycle.
  • Prepares Exhaust for DPF and SCR Systems
    By increasing exhaust temperature and conditioning gases, the DOC helps downstream components like the DPF and SCR function more effectively.
  • Supports Overall Aftertreatment System Efficiency
    A properly functioning DOC helps maintain balanced emissions control, improving how the entire system processes exhaust gases.
  • Built to OEM Standards for Cummins Applications (2021–2026)
    Manufactured to OEM 5506239 specifications, this DOC filter is designed for proper fitment and integration with the factory exhaust system.

The DOC filter is more than just a component—it’s the starting point of effective emissions control. For Cummins engines, having a reliable DOC in place helps ensure cleaner exhaust flow, supports downstream systems, and keeps the aftertreatment process running smoothly over time.

The Diesel Oxidation Catalyst (DOC) is designed to reduce harmful exhaust gases and support the overall efficiency of the aftertreatment system. Unlike some other components, the DOC does not require frequent cleaning under normal conditions. However, when contamination or buildup occurs, certain cleaning methods may be used to restore function depending on the severity of the issue.

  • Thermal cleaning is one of the most common methods, using controlled heat to burn off accumulated hydrocarbons and deposits inside the catalyst.
  • Pneumatic cleaning may be used in some cases to remove loose ash or debris from the surface without damaging the internal structure.
  • Professional cleaning services often combine multiple techniques to safely restore airflow and catalyst efficiency.
  • Chemical cleaning is generally avoided unless specifically recommended, as harsh chemicals can damage the catalyst material.
  • Before cleaning, it is important to diagnose and fix underlying issues such as oil or coolant leaks to prevent recontamination.
  • In cases of severe contamination or internal damage, replacement may be necessary instead of cleaning.

Proper diagnosis is essential before choosing a cleaning method. Maintaining engine health, using quality fuel, and addressing issues early can help reduce the need for DOC cleaning and extend the life of the aftertreatment system.

 

It reduces gases like carbon monoxide and unburned hydrocarbons.

Yes, heat from the exhaust is needed to activate the catalytic reactions.

Yes, buildup and contamination can reduce its ability to convert emissions.

It typically uses a ceramic honeycomb coated with catalytic metals like platinum or palladium.

Cummins DOC Filters

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