
Cummins QSB 4.5L, ISB, 3.8 Inlet Catalyst Module DOC 2018-2024: OEM 5505815
CUMMINS QSB 4.5L, ISB, 3.8 INLET CATALYST MODULE DOC 2018-2024: OEM 5505815

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY
1M MILES OR 1 YEAR
PRODUCT DESCRIPTION
This is a Remanufactured Tamerx Inlet Catalyst Module DOC, Tamerx part number 5505815RM-DOC ( OEM Part Number 5505815 ). 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 QSB 4.5L, ISB, 3.8, production years 2018-2024, and comes with a One Million Miles or One Year Warranty.
Additional Notes: Stage V LD-SMS- Horizontal - SISO A060N055
OEM NUMBERS
| Primary OEM | 5505815 |
| Additional OEM | 5505815 |
ADDITIONAL DETAILS
| CONDITION | Remanufactured |
| UPC / Barcode | 00840490558366 |
| WEIGHT | 32.00 LBS |
SHIPPING OPTIONS
Ship Weight : 32.00 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 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, 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 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.
Optimize exhaust treatment with this Cummins QSB 4.5L, ISB 3.8 Inlet Catalyst Module DOC for 2018–2024 applications. OEM 5505815 helps oxidize harmful exhaust pollutants, supporting proper emissions control and aftertreatment system operation. A dependable replacement for damaged, contaminated, or failing inlet catalyst modules in compatible Cummins QSB 4.5L and ISB 3.8 engines.
FITMENT CHART
| YEAR | MAKE | ENGINE(S) | ||||
|---|---|---|---|---|---|---|
| 2018 | Cummins | QSB 4.5L | ISB | 3.8 | ||
| 2019 | Cummins | QSB 4.5L | ISB | 3.8 | ||
| 2020 | Cummins | QSB 4.5L | ISB | 3.8 | ||
| 2021 | Cummins | QSB 4.5L | ISB | 3.8 | ||
| 2022 | Cummins | QSB 4.5L | ISB | 3.8 | ||
| 2023 | Cummins | QSB 4.5L | ISB | 3.8 | ||
| 2024 | Cummins | QSB 4.5L | ISB | 3.8 | ||
PEOPLE ALSO ASKS | BLOG(S)
The first stage of exhaust treatment plays an important role in preparing diesel exhaust for the components that follow. The Cummins QSB 4.5L, ISB 3.8 Inlet Catalyst Module DOC 2018-2024: OEM 5505815 provides an oxidation catalyst section at the inlet of the aftertreatment system, helping treat exhaust compounds before they reach downstream filtration components.
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OEM 5505815 is intended for compatible 2018-2024 Cummins QSB 4.5L and ISB 3.8 diesel applications.
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Inlet catalyst positioning allows exhaust gases to undergo oxidation treatment early in the aftertreatment process.
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Diesel oxidation catalyst (DOC) technology helps convert carbon monoxide and unburned hydrocarbons into less harmful compounds.
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Catalyst-coated internal surfaces provide the reaction area needed for chemical oxidation as exhaust passes through the module.
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Flow-through substrate construction guides exhaust gases through the catalyst without trapping soot like a diesel particulate filter.
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Supports downstream DPF operation by contributing to exhaust conditions that can assist the regeneration process.
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Heat-resistant materials accommodate the elevated temperatures and repeated thermal changes within the exhaust system.
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Application-specific housing and connections help maintain proper alignment with compatible Cummins aftertreatment components.
The Cummins QSB 4.5L, ISB 3.8 Inlet Catalyst Module DOC OEM 5505815 provides an important initial treatment stage for diesel exhaust before it reaches downstream emissions components. Customers searching for a Cummins QSB 4.5L DOC catalyst, Cummins ISB 3.8 inlet catalyst module, diesel oxidation catalyst, DOC filter replacement, or OEM 5505815 can find this application-specific component at TamerX Diesel Parts for compatible 2018-2024 applications.
Cracks in an Inlet Catalyst Module Diesel Oxidation Catalyst (DOC) can allow exhaust gases to escape and produce unusual noises during engine operation. Since the DOC is part of the diesel aftertreatment system, damage to its housing, welds, or connections may affect exhaust flow, emissions performance, and surrounding components.
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Exhaust gas leaks: Cracks in the module housing or welded sections can allow hot exhaust gases to escape before reaching downstream aftertreatment components.
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Hissing or whistling sounds: Exhaust escaping through small cracks or damaged connections may create noticeable noises, especially during acceleration.
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Rattling noises: A damaged or loose internal catalyst substrate may produce rattling or vibration during engine operation.
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Visible soot deposits: Black soot marks around cracks, seams, or connections can indicate escaping exhaust gases.
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Increased exhaust noise: Larger cracks or damaged seals may cause louder exhaust sounds than normal.
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Aftertreatment fault codes: Exhaust leaks can affect temperature conditions or sensor readings, potentially triggering emissions-related diagnostic trouble codes.
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Reduced system efficiency: Leaks or internal DOC damage may interfere with normal catalyst operation and downstream DPF regeneration performance.
A cracked Inlet Catalyst Module DOC should be inspected promptly to prevent exhaust leaks and additional aftertreatment problems. Checking the module housing, welds, mounting points, gaskets, and internal catalyst condition can help determine whether repair or replacement is necessary.
Low exhaust temperatures, catalyst contamination, aging, or problems with upstream engine operation can reduce DOC effectiveness. Proper diagnosis is necessary to determine whether the catalyst or another component is responsible.
Internal restrictions can increase exhaust backpressure and interfere with normal exhaust flow. Depending on severity, this may contribute to reduced engine power, warning indicators, or aftertreatment problems.
Incomplete combustion can increase the amount of unburned hydrocarbons and soot entering the DOC. Excessive exposure may contribute to deposits, abnormal temperature conditions, or reduced catalyst effectiveness.
Proper exhaust flow allows gases to pass through the catalyst structure and contact its active surfaces. Restrictions or uneven flow can interfere with oxidation reactions and affect downstream aftertreatment operation.



