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Autocar Cummins ISX DEF Head Unit

AUTOCAR CUMMINS ISX DEF HEAD UNIT

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$1,295.00

CORE CHARGE:

$250.00
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 NUMBER
PART TYPEDEF Head Unit
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEISX
YEAR
PART NUMBER5410-11-FC01-1
APPLICATION NOTESAutocar
ADDITIONAL NOTESDEF Header, 40 MICRON, 11"

PRODUCT DESCRIPTION

This is a Remanufactured, Tamerx DEF Head Unit, Tamerx part number 5410-11-FC01-1. This part is primarily made for a Cummins ISX, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

Additional Notes: DEF Header, 40 MICRON, 11"

OEM NUMBERS

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490540385
WEIGHT8.00 LBS

SHIPPING OPTIONS

Ship Weight : 8.00 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.


Meet the Autocar Cummins ISX DEF Head Unit — your engine’s precision partner in emissions control. Built for durability and accuracy, this head unit delivers consistent DEF dosing, seamless integration with Cummins ISX systems, and peace of mind that your vehicle stays compliant under all conditions. Rugged, reliable, and engineered for performance — it’s the upgrade your exhaust system deserves.

PEOPLE ALSO ASKS | BLOG(S)

The DEF (Diesel Exhaust Fluid) head unit is a vital part of modern diesel engines, ensuring the system accurately monitors fluid quality, level, and temperature. A failing DEF head unit can lead to costly downtime, reduced efficiency, and engine derates. Fortunately, with the right maintenance practices, you can extend its lifespan and keep your vehicle running smoothly.

Key Maintenance Practices for DEF Head Units

  • Use Certified DEF Fluid
    Always fill the tank with high-quality, ISO 22241-compliant DEF fluid to prevent contamination and sensor damage.

  • Keep the Tank Clean
    Routinely inspect the DEF tank for debris, dirt, or crystallization build-up. A clean tank helps sensors function properly.

  • Check Electrical Connections
    Inspect wiring and connectors regularly for corrosion, looseness, or wear that could disrupt communication with the ECM.

  • Avoid Extreme Temperatures
    Whenever possible, store vehicles in environments that minimize freezing or overheating, both of which can damage sensors.

  • Schedule Regular Inspections
    Incorporate DEF system checks into routine maintenance to catch small issues before they become major failures.

  • Handle Components Carefully
    During servicing, avoid rough handling of the DEF head or tank, as improper care can shorten its lifespan.

Consistent maintenance practices not only extend the life of the DEF head unit but also protect the entire emissions system. By using quality fluid, keeping the system clean, and performing regular checks, operators can reduce the risk of breakdowns and ensure their vehicles remain reliable and compliant.

Common failures include sensor drift, clogging from contaminants, float sticking, or seal leaks causing false readings.

Gently flush with clean DEF (meeting manufacturer’s spec), avoid harsh solvents, and carefully clean around sensors to prevent damage.

You drain the DEF from the tank, disconnect electrical and fluid lines, remove the old head, install the new one, prime, and verify calibration.

You risk engine derate, emissions noncompliance faults, or shutdown due to SCR system errors.

 

Cummins DEF Head Units

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