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TICO Tractors Cummins DEF Head Unit

TICO TRACTORS CUMMINS 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 NUMBER20086-9
PART TYPEDEF Head Unit
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPE
YEAR
PART NUMBER5410-11-FA01-3
APPLICATION NOTESTICO Tractors
ADDITIONAL NOTESDEF Header, 40 MICRON, 11"

PRODUCT DESCRIPTION

This is a Remanufactured, Tamerx DEF Head Unit, Tamerx part number 5410-11-FA01-3 ( OEM Part Number 20086-9 ). This part is primarily made for a Cummins , 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

Primary OEM20086-9
Additional OEM20086-9

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490540224
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.


Optimize your TICO Tractor’s emissions system with our DEF Head Unit designed for Cummins engines—engineered to deliver precise DEF dosing, monitor fluid status and temperature, and protect your equipment from SCR errors and derates. Built to OEM standards for plug-and-play compatibility, this robust module offers field-ready reliability, so your machine stays compliant, efficient and ready for action when it counts.

PEOPLE ALSO ASKS | BLOG(S)

In busy terminal operations and yards where every minute counts, ensuring your emissions system stays in spec is more than compliance—it’s uptime. The DEF (Diesel Exhaust Fluid) head unit on TICO Tractors with a Cummins engine is one of the most critical components in the SCR (Selective Catalytic Reduction) system. The correct unit built to OEM 20086-9 standards ensures accurate sensing and dosing of DEF. If it fails or drifts out of calibration, you could end up with warning codes, dosing errors, or forced derates at inopportune times.

  • Monitors DEF fluid level, temperature, and urea concentration—and sends accurate feedback to the engine’s control unit

  • Controls precise dosing of DEF into the exhaust stream so that NOx emissions get properly reduced

  • Built to match OEM 20086-9 tolerances, ensuring drop-in compatibility for TICO Tractors / Cummins setups

  • Helps avoid fault codes, emissions warnings, or engine derates caused by sensor drift or inaccurate readings

  • Designed to withstand vibration, stop-start cycles, and exposure to diesel exhaust fluid chemistry

  • Comes with core return option and full 1-million-mile / 1-year warranty

Don’t let a small sensor become your equipment’s weak point. Installing the correct DEF head unit according to OEM 20086-9 ensures your emissions feedback loop stays accurate, your SCR system stays efficient, and your fleets remain ready to move when the yard demands it. Emissions readiness isn’t optional—it’s foundational.

The DEF (Diesel Exhaust Fluid) head unit is a vital component in modern diesel engines, responsible for monitoring DEF level, quality, and temperature. It ensures that the emissions system functions correctly and keeps the vehicle compliant with environmental standards. However, over time, several factors can lead to DEF head unit failure, often resulting in fault codes, false readings, or engine derate conditions.

Common Causes of DEF Head Unit Failures

  • Contaminated DEF Fluid
    Dirt, debris, or water entering the DEF tank can damage sensitive sensors inside the unit and cause inaccurate data readings.

  • Crystallization Buildup
    DEF can crystallize when exposed to air, forming deposits that block or interfere with the sensors’ ability to read accurately.

  • Extreme Temperatures
    Freezing weather can temporarily disable the sensors, while prolonged heat exposure can degrade electronic components over time.

  • Electrical or Wiring Issues
    Corroded connectors, damaged wiring, or poor grounding can interrupt communication between the DEF head unit and the ECM (Engine Control Module).

  • Normal Wear and Tear
    Long-term use in harsh operating environments can cause gradual sensor deterioration, especially in high-mileage vehicles.

  • Improper Handling During Maintenance
    Rough handling or improper cleaning methods can physically damage the sensors or seals within the unit.

DEF head unit failures are most often caused by contamination, crystallization, and temperature extremes—but many of these issues are preventable. Using clean, high-quality DEF fluid, inspecting the system regularly, and avoiding rough handling during maintenance can extend the life of the unit. Proper care ensures accurate readings and reliable emissions system performance for years to come.

Check for secure mounting, correct electrical connector fit, no leaks at fluid fittings, proper calibration and fault code clearance post-install.

While exterior cleaning of housing and connectors may help, internal metering or sensing faults usually require full replacement of the unit.

By providing rugged, accurate control of DEF dosing it helps ensure the after-treatment system remains fully operational under tough conditions.

With proper fluid quality, installation and maintenance it should provide long-term service, though actual lifespan will depend on operating conditions.

Cummins DEF Head Units

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