REV Group Cummins ISL DEF Head Unit
REV GROUP CUMMINS ISL DEF HEAD UNIT
ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY
WARRANTY
1M MILES OR 1 YEAR
PRODUCT DESCRIPTION
This is a Remanufactured, Tamerx DEF Head Unit, Tamerx part number 5410-13-FA01-3 ( 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 OEM | 723017 |
| Additional OEM | 723017 |
ADDITIONAL DETAILS
| CONDITION | Remanufactured |
| UPC / Barcode | 00840490539914 |
| WEIGHT | 8.00 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.
Upgrade your emissions control with the REV Group Cummins ISL DEF Head Unit — engineered for precision, durability, and seamless integration. This rugged module delivers real-time monitoring of DEF level, temperature, and quality to ensure your SCR system runs optimized and your engine avoids derates. Built tough for fleet duty and backed by Tamerx’s reliable warranty, it’s the emissions solution your rig deserves.
PEOPLE ALSO ASKS | BLOG(S)
In modern emission systems, the DEF (Diesel Exhaust Fluid) head unit is one of those small—but absolutely critical—components that many people take for granted. For REV Group vehicles using the Cummins ISL engine, the DEF Head Unit to OEM 719006 specification (Tamerx part 5410-11-FA01-5) ensures accurate sensing, consistent dosing, and reliable communication with the engine control module. If this device is compromised or out of calibration, you may see event codes, system derates, or SCR malfunctions—unpleasant surprises when you depend on your vehicle the most. tamerx.com
-
Constantly monitors DEF fluid level, temperature, and urea concentration, and transmits that data to the vehicle’s ECU
-
Regulates precise dosing of DEF into the exhaust stream so the SCR (Selective Catalytic Reduction) system can reduce NOx properly
-
Built to OEM 719006 tolerances, offering plug-and-play compatibility with REV Group Cummins ISL setups
-
Helps prevent fault codes, check engine warnings, and engine derates that result from misread or drifting sensor data
-
Includes a 40-micron filter to protect downstream components from particulate contamination
-
Designed to withstand real-world stresses—vibration, thermal cycling, and exposure to corrosive DEF chemistry
Even when everything appears normal, an aging or marginal DEF head can be creeping toward failure. Replacing it with a correct OEM 719006 unit restores the precision of your emissions feedback loop, keeps your SCR system functioning as intended, and helps your REV Group vehicle remain compliant and dependable. Don’t let a small sensor turn into a big problem.
The DEF (Diesel Exhaust Fluid) head unit is responsible for monitoring fluid level, temperature, and quality to keep your emissions system compliant. When it malfunctions, the system may no longer provide accurate data to the engine control module (ECM). While your vehicle may still run, continuing to drive with a bad DEF head unit can quickly lead to more serious problems.
What Happens If You Keep Driving
-
Dashboard Alerts
Warning lights such as the check engine or DEF system alerts may appear almost immediately. -
False Readings
You may see incorrect DEF levels or poor-quality fluid warnings even if the tank is properly filled with certified DEF. -
Diagnostic Trouble Codes (DTCs)
Fault codes like P203F, P205B, or P207F may be triggered and logged by the ECM. -
Derate Mode Risk
If the ECM cannot confirm accurate DEF data, it may reduce engine power or limit speed to meet emissions compliance. -
Possible Shutdown
Ignoring the issue may eventually lead to stricter restrictions or even vehicle shutdown within a few drive cycles.
While it may be possible to drive temporarily with a malfunctioning DEF head unit, doing so is risky. The problem can escalate quickly, leading to reduced power, derates, or even a complete shutdown. Addressing the issue promptly is the safest way to keep your vehicle reliable, compliant, and on the road.
You might see warning codes, inconsistent level/temperature readings, or the engine going into derate mode.
It should be checked during regular emissions or DEF system servicing or whenever DEF warnings appear.
Flush the DEF pickup area with clean, compliant fluid and gently clean or replace the internal strainer if necessary.
Yes — impurities can clog the filter, degrade sensor performance, cause false readings, or lead to system faults.
Cummins DEF Head Units
