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REV Group Cummins ISL DEF Head Unit

REV GROUP 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 NUMBER721463
PART TYPEDEF Head Unit
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEISL
YEAR
PART NUMBER5410-22-FA01-4
APPLICATION NOTESREV Group
ADDITIONAL NOTESDEF Header, 40 MICRON, 22"

PRODUCT DESCRIPTION

This is a Remanufactured, Tamerx DEF Head Unit, Tamerx part number 5410-22-FA01-4 ( OEM Part Number 721463 ). 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, 22"

OEM NUMBERS

Primary OEM721463
Additional OEM721463

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490540156
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 REV Group Cummins ISL DEF Head Unit — precision-engineered for seamless compatibility with your SCR system. This rugged unit delivers real-time readings of DEF level, temperature, and quality, helping prevent derates and keep your engine running clean and compliant. Built tough for fleet duty and backed by Tamerx’s reliability, it’s the upgrade your rig deserves.

PEOPLE ALSO ASKS | BLOG(S)

Precision in Emissions: REV Group Cummins ISL DEF Head Unit (OEM 719006)

In today’s regulated environment, every component of your emissions system must deliver accuracy—and the DEF (Diesel Exhaust Fluid) head unit is no exception. For REV Group vehicles powered by the Cummins ISL engine, the OEM 719006 DEF Head Unit is a critical sensor and control point that ensures your SCR (Selective Catalytic Reduction) system receives reliable feedback. A failing or miscalibrated head can lead to warning codes, engine derates, or emissions faults just when you need your vehicle most.

  • Continuously measures DEF fluid level, temperature, and urea concentration, relaying precise data to the ECU

  • Controls exact dosing of DEF into the exhaust stream to enable efficient NOx reduction

  • Designed to meet OEM 719006 tolerances, allowing plug-and-play compatibility with REV / Cummins ISL systems

  • Helps prevent fault codes, system warnings, and engine power restrictions caused by drifting sensor readings

  • Built to resist vibration, thermal cycling, and exposure to DEF’s corrosive nature

  • Includes internal filtration to protect injectors and plumbing from contamination

Many operators ignore DEF head maintenance until an emissions alarm forces their hand. But proactive replacement with the correct OEM 719006 DEF Head Unit restores sensor integrity, helps your SCR system perform optimally, and prevents surprise downtime. In the emissions chain, precision isn’t optional—this part ensures your system stays in balance.

How can I test if my DEF head unit is functioning properly?

The DEF (Diesel Exhaust Fluid) head unit is responsible for monitoring the DEF tank’s fluid level, quality, and temperature—key data needed for your emissions system to operate correctly. If the unit malfunctions, it can trigger fault codes, warning lights, or even reduced engine performance. Testing your DEF head unit helps confirm whether it’s working as it should or if it needs service or replacement.

Ways to Test a DEF Head Unit

  • Check for Warning Lights
    Look for DEF system or check engine lights on the dashboard. Intermittent or constant alerts may signal sensor issues.

  • Scan for Fault Codes
    Use a diagnostic tool to check for codes such as P203F (low DEF level), P205B (temperature sensor fault), or P207F (DEF quality issue)—all potential signs of a failing unit.

  • Verify DEF Levels Manually
    Compare the displayed DEF level to the actual fluid level in the tank. Inconsistent readings suggest a problem with the sensor.

  • Inspect for Crystallization or Contamination
    Look inside and around the DEF tank for crystal buildup or dirt that may interfere with the sensors.

  • Check Electrical Connections
    Ensure the wiring harness and connectors are clean, tight, and corrosion-free. Faulty electrical connections can mimic head unit failure.

  • Monitor System Performance
    After clearing any codes, observe whether they return. Recurring alerts often confirm that the head unit isn’t functioning properly.

Testing your DEF head unit involves a mix of visual inspection, code scanning, and comparing real-time data with actual DEF conditions. A properly functioning unit should deliver consistent readings without triggering warnings. If issues persist, it’s best to have the head unit professionally diagnosed or replaced to keep your emissions system running smoothly and your vehicle compliant.

You depressurize the DEF system, disconnect electrical connectors, unbolt the unit, and install a new one with proper sealing.

With clean DEF and regular maintenance, it can last many years, on par with the SCR system’s components.

Without a functioning heater, low temperatures may cause freezing or high viscosity, hindering dosing.

Yes — excessive vibration or impact can damage sensors, loosen connectors, or cause internal leaks.

Cummins DEF Head Units

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