Global Environmental Products Cummins ISL DEF Head Unit
GLOBAL ENVIRONMENTAL PRODUCTS 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 5410-11-FA01-10 ( OEM Part Number GS329564 ). 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, 11"
OEM NUMBERS
| Primary OEM | GS329564 |
| Additional OEM | GS329564 |
ADDITIONAL DETAILS
| CONDITION | Remanufactured |
| UPC / Barcode | 00840490541795 |
| 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.
Designed for Global Environmental Products equipment powered by Cummins ISL engines, the DEF Head Unit OEM GS329564 ensures dependable Diesel Exhaust Fluid system operation. This OEM-certified component is manufactured to precise factory standards, delivering accurate fitment and consistent functionality in municipal and industrial applications. By keeping the DEF system working properly, it supports emissions compliance and smooth engine performance under demanding conditions. Built with durability in mind, it withstands the rigors of daily operation, offering long-lasting reliability. For fleets and operators, this DEF head unit provides the trusted quality and assurance of a genuine OEM replacement.
PEOPLE ALSO ASKS | BLOG(S)
Vehicles built by Global Environmental Products and powered by Cummins ISL engines rely on Diesel Exhaust Fluid (DEF) technology to meet modern emission standards. At the heart of this system is the DEF Head Unit OEM GS329564, a compact but vital component that ensures the DEF system works correctly and consistently.
Why It’s Important
- Monitors DEF Levels
- The head unit constantly measures the amount of DEF in the tank and alerts the engine control module (ECM) when levels are low, helping prevent unexpected downtime.
- Tracks Temperature
- DEF can freeze in cold conditions or degrade in excessive heat. The head unit measures temperature to keep the system operating smoothly across all environments.
- Controls Fluid Flow
- Acts as the connection point between the DEF tank and the dosing system, providing both a pickup port to deliver fluid and a return port for unused DEF.
- Provides Filtration
- Built-in strainer keeps crystals, debris, and impurities from entering sensitive aftertreatment components.
- Communicates with the ECM
- Transmits real-time data that allows precise dosing, fault detection, and protective actions when necessary.
The DEF Head Unit OEM GS329564 is crucial for keeping your vehicle compliant with emissions standards and running reliably. Without it, the SCR system could not manage DEF effectively, leading to system faults, reduced performance, or costly repairs.
When a DEF (Diesel Exhaust Fluid) head unit starts failing, many drivers wonder if it can be serviced or repaired instead of replaced. While this might seem like a cost-saving option, the design of the component makes repair unlikely.
Why It Can’t Be Serviced
The DEF head unit is a sealed component containing sensitive sensors and electronics. Once these fail, they cannot be recalibrated or cleaned. Opening the unit usually causes more damage and voids its integrity.
Common Failure Points:
- Contaminated DEF fluid
- damaging internal sensors
- Extreme temperatures
- leading to cracking or crystallization
- Moisture intrusion
- affecting electronics
- Normal wear
- after years of use
In almost all cases, the answer is no. The DEF head unit isn’t built to be rebuilt, and replacement is the standard industry solution. DIY fixes or attempts to flush the unit rarely succeed and may even cause further system failures.
A faulty DEF head unit cannot be serviced or repaired. The only reliable fix is a complete replacement. Preventive care — such as proper DEF handling and storage — is the best way to avoid premature failure.
Yes, a failing unit may cause the machine to enter derate mode or limit functionality.
They scan for fault codes and verify sensor accuracy with diagnostic tools.
No, it installs as a direct-fit OEM part within the DEF tank assembly.
Delays can lead to false DEF readings, system warnings, and unexpected downtime.
Cummins DEF Head Units
