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Cummins ECO-FIT Cummins ISB 6.7L, B6.7 DEF Head Unit

CUMMINS ECO-FIT CUMMINS ISB 6.7L, B6.7 DEF HEAD UNIT

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$750.00

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 NUMBER 5511564
PART TYPE DEF Head Unit
BRAND Tamerx Diesel Products
ENGINE MAKE Cummins
ENGINE TYPE ISB 6.7L, B6.7
YEAR
PART NUMBER 2317-11-1
APPLICATION NOTES Cummins ECO-FIT
ADDITIONAL NOTES DEF Header, 297mm

PRODUCT DESCRIPTION

This is a Remanufactured, Tamerx DEF Head Unit, Tamerx part number 2317-11-1 ( OEM Part Number 5511564 ). This part is primarily made for a Cummins ISB 6.7L, B6.7, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

Additional Notes: DEF Header, 297mm

OEM NUMBERS

Primary OEM5511564
Additional OEM4378049, 5511564

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490540910
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.


Unleash precision emissions control with the Cummins ECO-FIT ISB 6.7L / B6.7 DEF Head Unit — expertly engineered for seamless fitment and high performance. This rugged, remanufactured unit delivers real-time accuracy in DEF level, temperature, and quality monitoring, helping your SCR system stay in balance, avoid derates, and maintain compliance. Built for longevity and backed by Tamerx’s proven warranty, it’s the smart, eco-friendly upgrade your engine deserves.

PEOPLE ALSO ASKS | BLOG(S)

Driving a Cummins ECO-FIT (ISB 6.7L / B6.7) engine means your aftertreatment system is under constant scrutiny. At the heart of that system is the DEF (Diesel Exhaust Fluid) head unit. The ECO-FIT DEF Head Unit, built to OEM 5511561 specifications, provides critical sensing, dosing, and feedback functions. When it fails or drifts from spec, you risk emissions faults, warning lights, or even engine derates.

  • Measures DEF fluid level, temperature, and urea concentration, sending that data to the engine control module

  • Controls precise dosing of DEF into the exhaust stream to support the SCR (Selective Catalytic Reduction) system’s NOx reduction

  • Designed to meet OEM 5511561 tolerances for seamless compatibility with the ECO-FIT / ISB 6.7L / B6.7 application

  • Helps prevent fault codes, emissions warnings, and engine derates triggered by incorrect sensor readings

  • Built to withstand vibration, thermal cycling, and exposure to corrosive DEF chemistry

  • Simplified replacement design helps reduce vehicle downtime

Many failures in emission systems trace back to a degraded DEF head whose readings no longer reflect reality. Installing the correct OEM 5511561 ECO-FIT DEF Head Unit restores your system’s accuracy, safeguards you from unexpected derates, and ensures your emissions system remains reliable. Don’t let a small component become your biggest liability.

The DEF (Diesel Exhaust Fluid) head unit is a key part of the emissions system, monitoring DEF level, quality, and temperature. When it begins to fail, the system can no longer send accurate information to the engine control module (ECM). This can lead to false warnings, reduced performance, and even costly downtime. Recognizing the symptoms early allows operators to address issues before they escalate.

Common Symptoms of a Failing DEF Head Unit

  • Dashboard Warning Lights
    Check engine lights or DEF system alerts often appear as one of the earliest signs of trouble.

  • Recurring Fault Codes
    Diagnostic codes such as P203F, P205B, or P207F may indicate sensor failures inside the DEF head unit.

  • Incorrect DEF Level Readings
    The system may show the tank as empty when it’s full, or full when it’s actually low.

  • False DEF Quality Alerts
    Poor-quality warnings may appear even when using clean, certified DEF fluid.

  • Reduced Engine Power or Derate
    The ECM may limit power or speed if it cannot verify accurate DEF data from the head unit.

  • Sensor Malfunctions Due to Crystallization
    Build-up around the sensors can interfere with accurate monitoring, leading to erratic readings.

A failing DEF head unit can quickly progress from false alarms to serious restrictions on vehicle operation. By paying attention to early signs like inaccurate readings, warning lights, or recurring codes, operators can take corrective action before a breakdown occurs. Proactive maintenance and timely repairs help keep vehicles compliant and reliable.

Flush gently with specification-grade DEF, avoid harsh solvents, and carefully clean sensor ports without damaging them.

Drain or isolate the DEF, disconnect fluid and electrical lines, remove the old unit, install the replacement, prime, and calibrate.

The engine may derate, emit emissions faults, or enter a safe mode until the DEF head is repaired or replaced.

It sends electrical signals representing level, temperature, and fluid quality to the engine control module for dosing decisions.

Cummins DEF Head Units

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