Volvo/Mack D13/MP8 DEF Head Unit
VOLVO/MACK D13/MP8 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 24382877 ( OEM Part Number 24382877 ). This part is primarily made for a Volvo/Mack D13/MP8, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here
Additional Notes: DEF Header, 25L
OEM NUMBERS
| Primary OEM | 24382877 |
| Additional OEM | 22278207, 24382877 |
ADDITIONAL DETAILS
| CONDITION | Remanufactured |
| UPC / Barcode | 00840490541764 |
| 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.
Designed for Volvo and Mack trucks, the DEF Head Unit OEM 24382877 ensures reliable Diesel Exhaust Fluid system operation in D13 and MP8 engines. This genuine OEM component is manufactured to precise factory standards, providing accurate fitment and dependable service in demanding applications. By keeping the DEF system functioning properly, it helps maintain emissions compliance and steady engine performance. Its durable construction is built to endure the challenges of heavy-duty trucking, offering long-term reliability. For operators and fleets, this DEF head unit delivers OEM-certified quality and the confidence of a trusted replacement.
PEOPLE ALSO ASKS | BLOG(S)
Volvo and Mack trucks equipped with the D13 and MP8 engines use advanced aftertreatment technology to meet strict emission standards. A key component in this system is the DEF (Diesel Exhaust Fluid) Head Unit, part number 24382877. Mounted at the top of the DEF tank, this unit serves as both a monitoring hub and a fluid management system.
Main Purposes
- Monitor DEF Level
- Continuously measures the amount of DEF in the tank, ensuring operators know when fluid needs to be refilled.
- Track DEF Quality
- Verifies the concentration of DEF to confirm it meets required urea standards and is free from contamination.
- Temperature Control
- Detects DEF temperature to prevent freezing or overheating and works alongside heating systems when needed.
- Manage Fluid Flow
- Provides the pickup port for supplying DEF to the dosing system and a return path for unused fluid.
- Communicate with the ECM
- Sends real-time sensor data to the engine control module, which adjusts dosing and issues warnings if issues arise.
The DEF Head Unit OEM 24382877 ensures that Volvo and Mack trucks remain compliant with emissions regulations while maintaining reliable day-to-day operation. By combining monitoring, flow management, and communication into one component, it safeguards the entire aftertreatment system.
The DEF (Diesel Exhaust Fluid) head unit monitors fluid level, quality, and temperature to keep your truck’s emissions system working properly. When it starts to fail, your vehicle will usually give you early signs. Knowing how to diagnose a failing DEF head unit can save you from sudden downtime.
- Step 1: Look for Dashboard Warnings
- Most issues start with visible alerts. Watch for:
- DEF system fault codes
- Check engine light tied to emissions problems
- Incorrect DEF level readings (showing empty when full, or vice versa)
- Most issues start with visible alerts. Watch for:
- Step 2: Watch for Driving Restrictions
- A failing head unit often triggers countdowns or derate mode:
- Premature derate countdowns limiting operating time
- Reduced speed or limp mode restricting you to as low as 5 mph
- A failing head unit often triggers countdowns or derate mode:
- Step 3: Perform a Visual Inspection
- Check for DEF crystallization, damaged connectors, or contaminated fluid around the tank. These external issues often point to internal head unit failure.
- Step 4: Use a Diagnostic Tool
- A scan tool can confirm whether the head unit sensors are sending accurate data. If readings don’t match real conditions, the unit is likely failing.
Diagnosing a bad DEF head unit involves checking dashboard warnings, driving behavior, and data accuracy. If you see these signs, schedule service quickly before you’re stuck in full derate mode.
Delays can cause false DEF readings, compliance issues, and unexpected truck downtime.
Yes, inaccurate signals from the unit often trigger DEF-related warnings.
Using clean DEF fluid and keeping the tank free from contaminants helps protect the unit.
