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TEMSA Cummins DEF Head Unit

TEMSA 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 NUMBERTMS00157-H
PART TYPEDEF Head Unit
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPE
YEAR
PART NUMBER5410-13-FA01-4
APPLICATION NOTESTEMSA
ADDITIONAL NOTESDEF Header, 40 MICRON, 13"

PRODUCT DESCRIPTION

This is a Remanufactured, Tamerx DEF Head Unit, Tamerx part number 5410-13-FA01-4 ( OEM Part Number TMS00157-H ). 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, 13"

OEM NUMBERS

Primary OEMTMS00157-H
Additional OEMTMS00157-H

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490539921
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.


Meet the TEMSA Cummins DEF Head Unit — precision-engineered to keep your Cummins engine clean, compliant, and confidently in control. This rugged unit delivers real-time monitoring of DEF level, temperature, and quality while seamlessly integrating into your SCR system. Built to last, it helps prevent derates, boosts uptime, and gives you the emissions performance you need to stay road ready.

PEOPLE ALSO ASKS | BLOG(S)

In modern diesel systems, the DEF (Diesel Exhaust Fluid) circuit is much more than a tank and a pump — it’s an active feedback loop. For TEMSA vehicles powered by Cummins engines, the DEF Head Unit (OEM RP169181, Tamerx part 4310-11-28) serves as the brain of that loop. When functioning correctly, it monitors fluid properties and ensures clean, accurate dosing. When it falters, your SCR system, diagnostics, or engine behavior can suffer.

  • Monitors DEF fluid level, temperature, and urea concentration, supplying precise data back to the vehicle’s ECU

  • Regulates correct dosing of DEF into the exhaust stream so the SCR (Selective Catalytic Reduction) system can perform NOx conversion

  • Designed to match the OEM RP169181 spec for TEMSA/Cummins compatibility and calibration integrity

  • Helps prevent error codes, system warnings, or engine derates often caused by sensor drift or faulty feedback

  • Includes a 40-micron filter to protect against contaminants entering the DEF plumbing

  • Engineered to withstand real operating conditions: vibration, thermal cycles, and exposure to DEF chemistry

  • Backed by a 1,000,000-mile or 1-year warranty when installed properly

Running with a failing or out-of-spec DEF head unit is a risk — one that can lead to reduced reliability or unwanted maintenance stops. By installing the correct OEM RP169181 TEMSA / Cummins DEF Head Unit, you restore accuracy to your emissions system, safeguard SCR function, and reduce the chance of surprise faults. In the emissions chain, this small module carries significant responsibility.

The DEF (Diesel Exhaust Fluid) head unit is a critical part of your vehicle’s emissions system. It monitors DEF level, temperature, and quality, sending this information to the engine control module (ECM). When the unit starts failing, it can trigger alerts, affect performance, and even cause the vehicle to go into derate mode. Recognizing the early symptoms can help prevent bigger, costlier problems.

Common Symptoms of a Failing DEF Head Unit

  • Dashboard Warnings
    The check engine light or DEF system alert may come on, signaling sensor problems.

  • Recurring Fault Codes
    Codes like P203F (DEF level), P205B (temperature sensor issue), or P207F (DEF quality) often indicate a failing unit.

  • Inaccurate DEF Readings
    The system may show low or empty DEF even when the tank is full—or display full when it’s not.

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

  • Reduced Engine Power (Derate Mode)
    If the ECM cannot confirm accurate DEF data, it may limit torque, speed, or power to stay emissions-compliant.

  • Erratic Sensor Behavior
    Crystallization or contamination around the sensors can cause inconsistent or fluctuating readings.

A failing DEF head unit can escalate quickly from nuisance alerts to serious performance restrictions. If you notice repeated fault codes, inaccurate readings, or reduced power, it’s best to inspect and service the unit promptly. Catching these symptoms early helps keep your vehicle compliant, reliable, and on the road.

You might see DEF error codes, inconsistent level/temperature readings, or the engine entering a derated mode.

It should be checked during routine DEF or emissions system maintenance or when warning lights appear.

Flush the DEF pickup area with clean, compliant fluid and carefully clean or replace the internal strainer if clogged.

Depressurize the DEF system, disconnect wiring and sensor connectors, unbolt the head unit, and reseal properly on reinstallation.

Cummins DEF Head Units

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