
Cummins ISB 6.7L DEF Head Unit 2013-2021: OEM 213330
CUMMINS ISB 6.7L DEF HEAD UNIT 2013-2021: OEM 213330

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY
1M MILES OR 1 YEAR
PRODUCT DESCRIPTION
This is a New Tamerx DEF Head Unit, Tamerx part number 213330-DH ( OEM Part Number 213330 ). All parts are proudly remanufactured in the U.S.A. to the highest of OEM standards, and improvements are often applied to the original design in the remanufacturing process. This part is primarily made for a
Cummins ISB 6.7L, production years 2013-2021, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here
OEM NUMBERS
| Primary OEM | 213330 |
| Additional OEM | 213330 |
ADDITIONAL DETAILS
| CONDITION | New |
| UPC / Barcode | 00840490536487 |
| 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.
Installed on Cummins ISB 6.7L engines from model years 2013–2021, OEM 213330 is a DEF head unit engineered to manage and distribute Diesel Exhaust Fluid within the SCR aftertreatment system. This component is manufactured to OEM specifications to ensure accurate fitment and compatibility with factory dosing and exhaust assemblies. Constructed from durable materials, it is built to withstand the operating conditions common in medium- and heavy-duty diesel applications. The head unit supports controlled DEF flow and system communication to help maintain proper emissions treatment. It is a reliable choice for fleet service and targeted repair needs requiring dependable aftertreatment system performance.
FITMENT CHART
| YEAR | MAKE | ENGINE(S) | ||||
|---|---|---|---|---|---|---|
| 2013 | Cummins | ISB 6.7L | ||||
| 2014 | Cummins | ISB 6.7L | ||||
| 2015 | Cummins | ISB 6.7L | ||||
| 2016 | Cummins | ISB 6.7L | ||||
| 2017 | Cummins | ISB 6.7L | ||||
| 2018 | Cummins | ISB 6.7L | ||||
| 2019 | Cummins | ISB 6.7L | ||||
| 2020 | Cummins | ISB 6.7L | ||||
| 2021 | Cummins | ISB 6.7L | ||||
PEOPLE ALSO ASKS | BLOG(S)
The Cummins ISB 6.7L DEF Head Unit 2013–2021: OEM 213330 works as the control and monitoring module mounted on the Diesel Exhaust Fluid (DEF) tank. It manages fluid delivery to the SCR system while also monitoring DEF level and condition to ensure proper emissions system operation.
Installed at the top of the DEF tank, the head unit integrates multiple functions into one assembly. It communicates directly with the engine control module (ECM), providing real-time data that allows the system to maintain accurate DEF dosing.
Here’s how the DEF head unit operates within the system:
- Monitors DEF level
- using an internal level sensor
- Measures DEF temperature
- to prevent freezing or overheating issues
- Supplies DEF
- from the tank to the dosing pump or injector
- Communicates with the ECM
- to report fluid status and system conditions
When the engine is running, the ECM calculates how much DEF is needed based on exhaust conditions. The DEF head unit ensures that fluid is available and properly supplied to the dosing system. If fluid levels are low or if temperature conditions are outside normal range, the unit sends signals that may trigger warning lights or protective measures.
OEM 213330 is engineered specifically for 2013–2021 Cummins ISB 6.7L applications. Proper operation of the DEF head unit is essential for emissions compliance, accurate DEF delivery, and preventing aftertreatment-related fault codes or derates.
When your DEF head unit is failing, immediate diagnosis is important to prevent SCR faults, inaccurate DEF level readings, and potential engine derates. The DEF head unit typically contains the level sensor, temperature sensor, and quality sensor, and it communicates directly with the engine control module. When it fails, the system may trigger warning lights or countdown messages even if the DEF tank is full.
The first step is to perform a full diagnostic scan and review DEF level, temperature, and quality sensor data. Compare live readings to actual tank conditions to determine whether the issue is electrical, sensor-related, or communication-based.
Midway through troubleshooting, focus on these critical checks:
- Verify DEF level reading matches actual tank level
- Inspect wiring harness and connectors for corrosion or damage
- Check for crystallization buildup inside the tank
- Confirm proper voltage supply and ground to the head unit
- Scan for communication or sensor range/performance fault codes
- Verify DEF quality meets ISO 22241 standards
If readings are erratic, stuck, or outside normal range and wiring integrity is confirmed, the head unit likely requires replacement. Before installing a new unit, clean the tank if contamination or crystallization is present to prevent repeat failure.
Do not ignore DEF head unit faults, as they can lead to speed limitations or no-start conditions. Proper diagnostics and correction of electrical or contamination issues are essential to restoring reliable SCR system operation.
It is the factory diesel exhaust fluid (DEF) head assembly that houses key components of the DEF delivery system on Cummins ISB 6.7L engines from 2013–2021.
It is mounted in the DEF system near the DEF tank and dosing lines to support fluid distribution.
It serves as the central manifold that connects DEF pump, filters, and injector lines to deliver fluid to the aftertreatment system.
Yes, it is an OEM-specified component designed for direct replacement on compatible Cummins engines.





















































































































































































































































































