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Cummins QSB 6.7L DEF Aftertreatment Injector 2018-2024: OEM 5578982

CUMMINS QSB 6.7L DEF AFTERTREATMENT INJECTOR 2018-2024: OEM 5578982

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$795.00

CORE CHARGE:

$150.00
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 NUMBER5578982
PART TYPEDEF Aftertreatment Injector
BRANDCummins
ENGINE MAKECummins
ENGINE TYPEQSB 6.7L
YEAR2018-2024
PART NUMBER5578982-OE
WARRANTY
One Million Miles or One Year

PRODUCT DESCRIPTION

This is a Genuine New, Cummins DEF Aftertreatment Injector, Cummins part number 5578982-OE ( OEM Part Number 5578982 ).This part is primarily made for a Cummins QSB 6.7L, production years 2018-2024, and comes with a One Million Miles or One Year Warranty.

OEM NUMBERS

Primary OEM5578982
Additional OEM5578982

ADDITIONAL DETAILS

CONDITIONGenuine New
UPC / Barcode00840490558830
WEIGHT4.00 LBS

SHIPPING OPTIONS

Ship Weight : 4.00 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.


Regulate DEF injection with this Cummins QSB 6.7L DEF Aftertreatment Injector for 2018–2024 applications. OEM 5578982 delivers diesel exhaust fluid into the exhaust stream to help reduce nitrogen oxide emissions through the SCR system. A dependable replacement for clogged, damaged, or faulty DEF injectors in compatible Cummins QSB 6.7L engines.

FITMENT CHART

YEARMAKEENGINE(S)
2018Cummins QSB 6.7L
2019Cummins QSB 6.7L
2020Cummins QSB 6.7L
2021Cummins QSB 6.7L
2022Cummins QSB 6.7L
2023Cummins QSB 6.7L
2024Cummins QSB 6.7L

PEOPLE ALSO ASKS | BLOG(S)

White deposits around a DEF injector can raise questions about clogging and replacement. The Cummins QSB 6.7L DEF Aftertreatment Injector 2018–2024, OEM 5578982, delivers diesel exhaust fluid into the exhaust stream, where unobstructed dosing is essential for effective SCR emissions treatment.

  • How crystals form: When water evaporates from DEF left on exposed surfaces, it can leave solid urea residue around the injector tip or connections.

  • Why deposit location matters: External residue and deposits obstructing the nozzle require different assessments; visible crystals alone do not establish injector failure.

  • Nozzle restrictions affect delivery: Accumulation at the spray openings can interfere with DEF distribution, reducing the ammonia available for NOx conversion.

  • Recurring deposits need investigation: Injector leakage, dosing problems, and unsuitable exhaust conditions should be checked when buildup repeatedly returns.

  • Testing guides the repair: A manufacturer-specified dosing test helps determine whether the injector delivers the required quantity and closes correctly.

  • Correct replacement matching matters: Confirm OEM 5578982, electrical requirements, and engine compatibility before purchasing a replacement DEF dosing injector.

For customers shopping at TamerX Diesel Parts, evaluating crystallization and verifying compatibility helps determine whether the Cummins QSB 6.7L DEF Aftertreatment Injector is the appropriate replacement.

Several factors can cause a DEF Aftertreatment Injector to fail, including contaminated Diesel Exhaust Fluid (DEF), crystallization buildup, electrical problems, and prolonged exposure to harsh exhaust conditions. Since the injector delivers DEF into the exhaust stream to help the Selective Catalytic Reduction (SCR) system reduce nitrogen oxide (NOx) emissions, injector failure can disrupt proper dosing and trigger aftertreatment system faults.

  • DEF crystallization buildup: Dried DEF deposits can accumulate around the injector nozzle, restricting spray passages and interfering with proper fluid distribution.

  • Contaminated DEF: Dirt, water dilution, fuel, or other foreign substances in the DEF supply can damage internal injector components or obstruct the nozzle.

  • Excessive heat exposure: High exhaust temperatures and inadequate thermal protection can damage injector seals, electrical components, or internal mechanisms.

  • Electrical connection problems: Corroded terminals, damaged wiring, or loose connectors can interrupt the signals required for proper DEF injector operation.

  • Clogged injector passages: Crystalline deposits and debris can restrict DEF flow, resulting in insufficient dosing or an irregular spray pattern.

  • Internal component wear: Repeated operation, seal deterioration, or mechanical damage can cause the injector to leak, stick, or deliver DEF incorrectly.

  • DEF supply system problems: Incorrect dosing pressure, restricted supply lines, or malfunctioning pumps can interfere with injector operation and may contribute to premature failure.

A failing DEF Aftertreatment Injector can cause SCR efficiency problems, elevated NOx emissions, and recurring diagnostic trouble codes. Checking DEF quality, inspecting the injector for deposits or leaks, and testing electrical connections and dosing pressure can help identify the cause of failure and determine whether cleaning or replacement is necessary.

Yes. Frozen DEF, damaged heating components, or problems with the thawing system can temporarily prevent normal dosing. The aftertreatment system is generally configured to manage DEF freezing under appropriate operating conditions.

Internal restrictions may develop from DEF crystallization, contamination, or deposits within the fluid passages. These conditions can reduce the amount of DEF delivered to the exhaust system.

Technicians can perform manufacturer-approved injector activation and dosing tests while monitoring the quantity of DEF delivered. Irregular operation or incorrect dosing results may indicate a sticking internal valve.

Uneven spray distribution can result from nozzle contamination, incorrect fluid pressure, or internal injector deterioration. Poor distribution may interfere with DEF evaporation and contribute to deposits inside the exhaust system.

Cummins DEF Aftertreatment Injectors