CUMMINS DEF HEAD UNIT : OEM ASP-908-2317-564
ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY
WARRANTY
1M MILES OR 1 YEAR
PRODUCT DESCRIPTION
This is a Remanufactured, DuraWRX DEF Head Unit, DuraWRX part number ASP-908-2317-564 ( OEM Part Number ASP-908-2317-564 ). 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, 564mm
OEM NUMBERS
| Primary OEM | ASP-908-2317-564 |
| Additional OEM | 4378044, 4378046, 5511559, 5511561, ASP-908-2317-564 |
ADDITIONAL DETAILS
| CONDITION | New |
| UPC / Barcode | |
| WEIGHT | 4.00 LBS |
SHIPPING OPTIONS
Ship Weight : 4.00 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.
"This Product Doesn't Have a Core"
Intended for use in Cummins diesel emission systems, the OEM ASP-908-2317-564 DEF Head Unit delivers precise monitoring of diesel exhaust fluid levels and temperature. Its design follows original equipment standards, ensuring a direct fit and smooth integration with existing components. This unit plays a key role in maintaining accurate system feedback and supporting proper emissions function. Whether replacing a faulty sensor or completing scheduled service, it offers a reliable and consistent solution. OEM-grade construction ensures compatibility and long-term durability.
PEOPLE ALSO ASKS | BLOG(S)
The OEM ASP-908-2317-564 DEF head unit is a crucial component in the Cummins Selective Catalytic Reduction (SCR) system, responsible for monitoring and managing the Diesel Exhaust Fluid (DEF) inside the tank.
This unit ensures the DEF system functions reliably by performing several key tasks:
Primary functions include:
- DEF Level Sensing
- Measures the amount of DEF in the tank and communicates this data to the engine control module (ECM) to avoid low-fluid warnings or faults.
- Temperature Monitoring
- Tracks the DEF temperature to ensure it stays within the proper range for dosing, and to detect freezing conditions.
- Integrated Heater (if equipped)
- Activates in cold weather to prevent DEF from freezing, allowing the system to function in low temperatures.
- System Interface
- Connects directly to Cummins wiring harnesses for accurate communication with the ECM and other emissions system components.
- Delivery Port Support
- Enables fluid flow from the DEF tank to the dosing module as needed for NOx reduction.
Before installation, verify that OEM part number ASP-908-2317-564 matches your Cummins system to ensure proper fit and performance.
A failing DEF (Diesel Exhaust Fluid) head unit—also called the DEF level sensor or reservoir module—can cause a range of issues in your diesel vehicle’s emissions system. It’s responsible for monitoring DEF level, temperature, and fluid quality. When it fails, it often triggers warnings or incorrect system behavior.
Signs Your DEF Head Unit Might Be Bad:
- Incorrect DEF level readings
- The gauge may read empty or full inaccurately, even after refilling.
- “Service DEF System” or “No Start in XXX Miles” messages
- These countdown alerts are triggered when the system can't verify DEF status.
- Check engine light (CEL) or DEF warning light
- These lights appear when the sensor data is out of range or missing.
- Stored fault codes
- Common diagnostic trouble codes (DTCs) include:
- P203F – Reductant Level Low
- P206A/B – Reductant Quality Sensor Circuit
- P204C – Reductant Temperature Sensor Performance
- Common diagnostic trouble codes (DTCs) include:
- Limp mode or reduced speed limitation
- When the system can't confirm DEF functionality, it may limit vehicle speed as a failsafe.
What to Do:
- Use a scan tool to check for related fault codes.
- Visually inspect wiring and connectors for damage or corrosion.
- Confirm DEF level and quality.
- If issues persist, the DEF head unit may need replacement.
Prompt diagnosis can help you avoid being stuck in derate mode or facing a no-start condition.
No, its operation is monitored electronically through the vehicle’s ECM—diagnostic tools are required for evaluation.
Yes, incorrect positioning can lead to inaccurate readings or DEF pickup issues due to suction tube misalignment.
Internal contamination usually requires replacement, as cleaning can damage the sensors or heater.
Yes, issues with level sensing, temperature detection, or DEF delivery can trigger SCR faults that result in reduced engine torque.
Cummins DEF Head Units
