Tiffin Motorhomes Cummins ISX DEF Head Unit
TIFFIN MOTORHOMES CUMMINS ISX 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 5410-22-FC01-3 ( OEM Part Number 5023032 ). This part is primarily made for a Cummins ISX, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here
Additional Notes: DEF Header, 40 MICRON, 22"
OEM NUMBERS
| Primary OEM | 5023032 |
| Additional OEM | 5023032 |
ADDITIONAL DETAILS
| CONDITION | Remanufactured |
| UPC / Barcode | 00840490540651 |
| 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.
Unleash dependable emissions control with the Tiffin Motorhomes Cummins ISX DEF Head Unit — engineered to keep your motorhome’s Cummins ISX running clean and compliant wherever the road takes you. This precision device delivers real-time monitoring of DEF level, temperature, and quality, integrating seamlessly into your system to help prevent derates and costly downtime. Rugged, efficient, and designed for the long haul, it’s the smart upgrade your RV deserves.
PEOPLE ALSO ASKS | BLOG(S)
When you’re navigating cross-country in a Class A motorhome, the last thing you want is a DEF (Diesel Exhaust Fluid) error flashing mid-trip. The Tiffin Motorhomes Cummins ISX DEF Head Unit, OEM 5023032, is much more than a sensor—it’s an essential control node in your vehicle’s emissions system. If it malfunctions, you risk warning lamps, reduced engine performance, or even enforced derates that can ruin your travel plans.
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Measures and sends real-time data on DEF fluid level, temperature, and quality to your ECM
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Regulates precise dosing of urea into the exhaust stream for effective SCR (Selective Catalytic Reduction) function
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Designed to meet OEM 5023032 tolerances for seamless integration with Tiffin ISX systems
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Helps prevent emissions fault codes, check engine light alarms, and engine derates caused by inaccurate sensor signals
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Built to withstand the rigors of motorhome service life—temperature changes, vibration, and DEF exposure
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Simplified replacement design to reduce downtime and get your rig back on the road
Owners of Tiffin motorhomes often report sudden DEF sensor failures that lead to check engine lights and costly service stops—some have even been warned their rig could be derated to 5 mph if not addressed quickly. Being proactive about DEF head maintenance is one of the best ways to protect your engine and your schedule.
By installing a reliable, OEM-matched DEF head unit, you restore the proper feedback loop to your emissions system, avoid nasty surprises, and keep your Tiffin’s Cummins ISX running clean and compliant. Don’t wait for a warning light—treat this component as a key to your motorhome’s peace of mind.
The DEF (Diesel Exhaust Fluid) head unit is an important part of modern diesel emission systems, responsible for monitoring fluid level, quality, and temperature. Like any component, it has a limited service life. Understanding how long a DEF head unit typically lasts—and what factors influence its lifespan—can help operators plan ahead and avoid unexpected downtime.
Typical Lifespan and Influencing Factors
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Average Service Life
A DEF head unit generally lasts 5 to 7 years under normal operating conditions, though some may last longer with proper care. -
Operating Environment
Vehicles exposed to extreme temperatures, heavy vibration, or harsh weather may experience shorter DEF head unit lifespans. -
DEF Fluid Quality
Using certified, contamination-free DEF fluid reduces strain on sensors and extends the life of the unit. -
Maintenance Practices
Regular system checks, tank cleaning, and careful handling during service help prevent premature failure. -
Usage Patterns
Fleet vehicles with high operating hours may see faster wear compared to trucks used less frequently. -
Signs of Aging
Frequent diagnostic trouble codes (DTCs), inaccurate readings, or false quality alerts often indicate that a DEF head unit is reaching the end of its life.
While a DEF head unit is built to last several years, its actual lifespan depends heavily on fluid quality, environment, and maintenance. By following preventive care practices and addressing issues early, operators can maximize the life of the unit and keep their vehicles compliant and reliable on the road.
Inspect and test it at every regular service interval, checking sensor outputs, connections, and cleanliness.
Cold can slow sensor response or risk freezing, while heat may cause drift, degrade components, or shift calibration.
Very sensitive — particles, crystals, or impurities can interfere with sensors or clog internal pathways.
The engine control module may interpret the delay as a fault or abnormal reading until the signal stabilizes or is reset.
Cummins DEF Head Units
