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E-ONE Cummins ISL DEF Head Unit

E-ONE CUMMINS ISL 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 NUMBER723017
PART TYPEDEF Head Unit
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEISL
YEAR
PART NUMBER5410-13-FA01-1
APPLICATION NOTESE-ONE
ADDITIONAL NOTESDEF Header, 40 MICRON, 13"

PRODUCT DESCRIPTION

This is a Remanufactured, Tamerx DEF Head Unit, Tamerx part number 5410-13-FA01-1 ( OEM Part Number 723017 ). This part is primarily made for a Cummins ISL, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

Additional Notes: DEF Header, 40 MICRON, 13"

OEM NUMBERS

Primary OEM723017
Additional OEM723017

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490539860
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.


Introducing the E-ONE Cummins ISL DEF Head Unit — a reliable solution engineered to keep your emissions system operating at its best. Crafted for seamless compatibility with Cummins ISL engines in E-ONE vehicles, this unit ensures accurate DEF monitoring for level, temperature, and quality. Built tough for long-lasting performance, it helps prevent costly downtime, reduces the risk of engine derates, and keeps your vehicle compliant mile after mile.

PEOPLE ALSO ASKS | BLOG(S)

When you operate diesel vehicles like fire trucks or municipal trucks, staying compliant with emissions standards is nonnegotiable—and that’s where the DEF head plays a starring role. The E-ONE Cummins ISL DEF Head Unit (OEM 5142426-01) is a critical control point in your vehicle’s exhaust aftertreatment system. If this unit becomes faulty, you risk system errors, derates, and disrupted service. Investing in the right replacement keeps your fleet reliable and emissions-compliant.

  • Monitors DEF fluid temperature, concentration, and level to deliver precise dosing into the SCR (Selective Catalytic Reduction) system

  • OEM 5142426-01 ensures direct compatibility with Cummins ISL engines in E-ONE applications

  • Prevents emissions fault codes, system warnings, and engine derates caused by defective readings

  • Built to resist vibration, corrosion, and thermal stress common in heavy duty use

  • Designed for straightforward drop-in replacement to reduce downtime

  • Restores accurate data to your engine control module, allowing smooth system operation

A failing or degraded DEF head can lead to unexpected complications—don’t leave it to chance. By choosing the OEM 5142426-01 E-ONE Cummins ISL DEF Head Unit, you’re securing reliability, regulatory compliance, and peace of mind in one essential component. Keep your emissions system in top shape and stay ahead of costly surprises on the road.

The DEF (Diesel Exhaust Fluid) system is critical for reducing emissions in modern diesel engines, and the DEF head unit plays a central role by monitoring fluid level, temperature, and quality. When the DEF head unit fails, the system may no longer deliver accurate information to the engine control module (ECM). This often triggers a countdown toward reduced performance—or even complete vehicle shutdown—if the problem isn’t addressed quickly.

How Fast DEF Head Unit Issues Escalate

  • Immediate Warning Lights
    A failing DEF head unit can trigger dashboard warning lights or diagnostic trouble codes (DTCs) almost instantly.

  • Within Hours of Operation
    If ignored, the ECM may begin restricting power output within a few hours of detecting the fault, reducing performance to encourage immediate repairs.

  • 24 to 48 Hours of Driving
    Continued operation without fixing the issue may escalate the derate process. At this stage, the vehicle may limit speed or torque significantly.

  • Progressive Countdown to Shutdown
    Regulations require vehicles to enter a severe derate or shutdown mode if DEF system issues are not resolved. Depending on the engine and manufacturer, this countdown can span from a day to a few drive cycles.

  • Severity Varies by Conditions
    Factors like the specific fault code, DEF system design, and driving environment influence how quickly a derate occurs. Some systems may allow limited operation, while others move to shutdown more aggressively.

A DEF head unit issue should never be taken lightly. What starts as a simple warning can rapidly escalate into engine derates or full shutdowns, leaving you stranded and facing costly downtime. Addressing problems as soon as warning signs appear is the best way to keep your vehicle reliable and compliant on the road.

You drain the DEF, disconnect lines and electrical, remove the old head, install the replacement, prime it, and verify calibration.

The engine may derate power or eventually shut down to protect emissions compliance.

Periodic inspection during scheduled maintenance, sensor checks, and flushing low-use systems is recommended.

Extreme cold or heat can affect sensor accuracy or cause freezing, requiring heating or thermal management

Cummins DEF Head Units

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