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Cummins ISB 6.7L DOC Filter 2018-2021: OEM 62420B05

CUMMINS ISB 6.7L DOC FILTER 2018-2021: OEM 62420B05

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$2,850.00

CORE CHARGE:

$2,000.00
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 NUMBER62420B05
PART TYPEDOC Filter
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEISB 6.7L
YEAR2018-2021
PART NUMBER62420B05-DOC
APPLICATION NOTESTigercat Tier 4
ADDITIONAL NOTESThis is a OEM DOC Housing with New insert

PRODUCT DESCRIPTION

This is a Remanufactured Tamerx DOC Filter, Tamerx part number 62420B05-DOC ( OEM Part Number 62420B05 ). 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 ISB 6.7L, production years 2018-2021, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

Additional Notes: This is a OEM DOC Housing with New insert

OEM NUMBERS

Primary OEM62420B05
Additional OEM62420B05

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490536401
WEIGHT38.00 LBS

SHIPPING OPTIONS

Ship Weight : 38.00 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 for Cummins ISB 6.7L engines from model years 2018–2021, OEM 62420B05 is a DOC filter engineered to serve as part of the factory exhaust aftertreatment system. This diesel oxidation catalyst helps treat exhaust gases by facilitating the oxidation of hydrocarbons and carbon monoxide before they move to downstream components. Manufactured to OEM specifications, it ensures accurate fitment and compatibility with the engine’s exhaust assembly. Constructed from durable materials, it is built to withstand the high-temperature conditions common in medium- and heavy-duty diesel applications. It is a dependable choice for fleet maintenance and targeted repair needs requiring consistent aftertreatment system operation.

FITMENT CHART

YEARMAKEENGINE(S)
2018Cummins ISB 6.7L
2019Cummins ISB 6.7L
2020Cummins ISB 6.7L
2021Cummins ISB 6.7L

PEOPLE ALSO ASKS | BLOG(S)

The main role of the Cummins ISB 6.7L DOC Filter 2018–2021: OEM 62420B05 is to treat exhaust gases by oxidizing harmful pollutants before they move further through the aftertreatment system.

DOC stands for Diesel Oxidation Catalyst, and this component is one of the first stages in the exhaust aftertreatment process. As hot exhaust gases pass through the DOC filter, a catalytic reaction occurs that converts carbon monoxide (CO) and unburned hydrocarbons (HC) into carbon dioxide and water vapor. This process helps reduce harmful emissions before the exhaust reaches downstream components such as the diesel particulate filter (DPF) and Selective Catalytic Reduction (SCR) system.

In addition to reducing certain pollutants, the DOC also helps raise exhaust temperatures when needed. This is important for supporting proper DPF regeneration, where trapped soot is burned off to maintain system efficiency.

The primary responsibilities of OEM 62420B05 include:

  • Oxidizing carbon monoxide and hydrocarbons
  • Supporting overall emissions reduction
  • Assisting with DPF regeneration temperature management
  • Serving as a key first stage in the aftertreatment system

Designed specifically for 2018–2021 Cummins ISB 6.7L engines, this DOC filter plays a critical role in emissions compliance, exhaust treatment efficiency, and proper operation of the entire aftertreatment system.

You should replace your DOC (Diesel Oxidation Catalyst) filter when diagnostics confirm it has permanently lost oxidation efficiency or suffered structural damage. The DOC is designed to last a long time, so replacement should only occur after verifying that upstream engine and fuel system issues have been corrected.

Replacement becomes necessary when the DOC can no longer generate proper heat during regeneration or when catalyst efficiency fault codes persist despite repairs. Because the DOC supports DPF regeneration, its failure often leads to repeated failed regens and rising soot levels.

Midway through the evaluation process, the following conditions typically indicate DOC replacement is required:

  • Persistent DOC or oxidation efficiency fault codes
  • Low exhaust temperature rise across the DOC during active regen
  • Repeated failed DPF regeneration events
  • Catalyst poisoning from oil, fuel, or sulfur contamination
  • Cracked, melted, or physically damaged substrate
  • Excessive thermal damage from overheating

Before replacing the DOC, inspect injectors for over-fueling, check for oil contamination from turbo seal leaks, verify exhaust temperature sensor accuracy, and correct any air-fuel or EGR system issues. Installing a new DOC without resolving the root cause can lead to repeat failure.

DOC replacement should be based on confirmed performance loss or physical damage, ensuring long-term emissions compliance and protecting downstream components like the DPF.

Yes, it works with upstream and downstream sensors to help the engine control module monitor aftertreatment status.

Heavy-duty trucks and commercial vehicles equipped with Cummins ISB 6.7L engines from 2018–2021 use this DOC filter.

Yes, a diagnostic scan is typically recommended after installation to confirm proper emissions system communication.

Yes, professional installation is recommended due to its integration with the exhaust and sensor systems.

Cummins DOC Filters