Freightliner def tank level sensor. Replacing the DEF tank header on a Freightliner M2.

Freightliner def tank level sensor. First, check for debris or damage. Measure resistance across sensor pins; 59 ohms is typical, but verify against specs. DEF headers are a common failure on M2 vehicles. 58 inches Item Weight 0. Symptoms include false low DEF warnings or system faults. NOTE: DEF level testing by moving the float with the sensor connected to the vehicle wiring is not recommended because the display response time to any movement in the DEF sensor float can take several minutes. Here's a breakdown of the key points: ### Purpose of the Tool: - The tool is designed In the event that you would need to replace the DEF Tank Level Sensor, see instructions below. A flashing DEF level light with no voltage at the sending unit connector indicates wiring or power supply issues. Diesel Feb 16, 2023 · DEF (diesel exhaust fluid) is a vital component of the emission control system on modern diesel engines. Use a diagnostic tool to monitor sensor output during tank fill and consumption. – Air/Hydraulic: Air/ Jan 7, 2025 · Learn how to fix DEF system issues on Freightliner Cascadia with Detroit Diesel DD15. Dorman Products - 904-7368 : Diesel Exhaust Fluid Level Sensor. We were able to make it home before it lost majority of its power. Is the resistance less than five ohms? First truck parts: Supplier of DEF Sensors for Heavy Duty Trucks. Quality Sensors are integrated Find new and used Freightliner M2 106 DEF Tanks for sale in stock near you with fast delivery. com, America's online marketplace for heavy duty parts. All of these sensors are one unit that are installed inside the DEF Tank. Since Spartan uses sensors made by Shaw I asked about the source that FL Sep 9, 2021 · There are 3 specific SPN numbers along with their Failure Mode Indications that are associated with a DEF sensor failure: SPN 1761 FMI 9 Aftertreatment 1 Diesel Exhaust Fluid Tank Level-Abnormal Update Rate SPN 3364 FMI 9 Aftertreatment Diesel Exhaust Fluid Quality-Abnormal Update Rate Buy DEF Tanks & Components from top brands at the bigrigworld. Low DEF levels will trigger a decrease in engine performance. 1L L4 (OM651 906) 98000km. Strap on and hot that like button------ How to replace a def level unit/sending unit/header unit from a def tank. Any suggestion to work on it? Some threads say the whole DEF tank unit has to be replaced which is very expensive. The EPA mandates that we monitor DEF quality, and in doing such, we need to do it twice for verification. Description: Def Header 13/23G Condition: New Brand: Freightliner Part Number: 04-31677-000 Other Oem Part Numbers: 04-31677-000, 0431677000 Manufacturer information Freightliner® is the best-selling brand of heavy duty trucks in North America. Codes for DEF level, quality, sensor abnormal rate of change - replace DEF sending unit/quality sensor How To Remove A Radiator in 60 Seconds on A Semi Truck DEF Tank Quality Sensor/QLS/DEF Header Replacement Like Dislike 31 Freightliner M2 106 DEF tank, complete with a dosing pump. Tank was filled less than 1,000 miles ago. Check out free battery charging and engine diagnostic testing while you are in store. But when it's time to service any of these trucks, it also provides customers with the parts they need right when and where they need them. Freightliner A04-27942-000 Diesel Exhaust Fluid (DEF) Level Sensor Order now for same-day shipping on eligible purchases from FinditParts. See Fig. DEF Header Lever Sending Unit for 2017 Freightliner Cascadia. It can accurately monitor the DEF level, ensuring the stable operation of the DEF system High-Quality Steel SSI Header: The accompanying Steel SSI Header (Part No. This component lives in the DEF header (the sending unit mounted on top of your tank) and has three important jobs: Aug 13, 2024 · 04-31677-000 DEF Tank Header for Freightliner Cascadia This DEF tank header with a capacity of 13-23 gallons, this unit is designed to help regulate the airflow and ensure optimal performance for your engine. Or it is possible that the ECM needs to be updated. Overview The Urea Quality Level Sensor (UQLS) is a smart sensor that is located in the top of the Urea (DEF) Tank, commonly referred to as the DEF Level Sensor or Combined Tank Unit. Jul 25, 2022 · On the way home from an 800 mile trip I received the dreaded DEF derate codes. Keep your truck running efficiently with quality parts—order today! Order Freightliner M2 106 Diesel Exhaust Fluid (DEF) Level Sensor online today. With battery voltage and ground confirmed, and the sending unit replaced, check the DEF sensor wiring harness for corrosion or breaks. sensor is installed in DEF tank intake column. 8mm 4 Shop Freightliner diesel exhaust fluid (def) level sensors at My Little Salesman. com FREE DELIVERY possible on eligible purchases DEF Tank Level Sensor FREIGHTLINER M2 106 OEM 04-30774-001 SpartaCarsParts (50) 91. DEF level sensor failures causing inaccurate readings and warning lights on Freightliner trucks. M2 DEF gauge failures and sensor wiring faults commonly cause inaccurate or no DEF level readings. This direct-replacement sensor matches the fit and performance of the original equipment part for a reliable repair. Free Same Day Store Pickup. Descriptions and specifications contained in this publication provide no warranty, expressed or implied, and are subject to revision and Jun 25, 2011 · Great article with accurate details, this is what I do for a living and the def header consist of the level sensor, temp, sensor, and a quality sensor as def is 32. 5% de-ionized water, and is used to reduce emissions from diesel engines. Find the lowest prices Freightliner M2 106 aftermarket & OEM Diesel Emission Parts. 96 x 3. Chassis built on 01/01/2016 and newer has a quality sensor installed into the tank. The DEF (Diesel Exhaust Fluid) Quality Sensor on a Freightliner is located on the side of the DEF tank. Replacing the DEF (Diesel Exhaust Fluid) level sensor involves locating the sensor on the DEF tank, disconnecting electrical connectors, and removing mounting hardware. Jun 24, 2019 · Buy Dorman 904-7368 Diesel Exhaust Fluid (DEF) Level Sensor Compatible with Select Freightliner Models: Exhaust Gas - Amazon. Hello and Thanks for Watching :) This is for the Analog Bypass Freightliner def tank Level sensor How To. That was the good news. Wondering what the issue is and how much I should expect to pay. To resolve this issue, the entire sending unit will need to be removed and replaced. NEW 17-20 Freightliner Cascadia Diesel Exhaust Fluid (DEF) Level Sensor | 04-31677-000 | 2017-2020 Freightliner Cascadia Freedom Emissions Description: OE Reference: 04-31677-000 Item #: 04-31677-000 General Information A new improved fuel-level sending unit, manufactured by KUS, is available for retrofitting the fuel-level sending unit on all Freightliner vehicles. The DEF level sensor is a part of the DEF sending unit, which does more than measure liquids. Find the best priced new and used Diesel Exhaust Fluid (DEF) Level Sensors by owners and dealers. If you cant figure the Oct 18, 2024 · Understanding Def Light On Freightliner DEF Light Explanation: The DEF light indicates the level of Diesel Exhaust Fluid in the tank. Nov 8, 2024 · SPN 1761 code specifically refers to an issue with the DEF tank temperature sensor. Made specifically for Freightliner trucks, this lever sending unit is a great choice for those who want to keep their equipment running smoothly and efficiently. Free shipping on many items | Browse your favorite brands | affordable prices. The van is running normal and the DEF is full (visual inspected). DEF gauge only shows empty. Jun 26, 2011 · Problem with Sprinter vanDEF light is on even though the resevoir is full. . Remove and Install The connector. It is also called the DEF float assembly. If the DEF level gauge readings are inaccurate or erratic on a Freightliner Cascadia truck with We have a 2014 Phaeton that had its DEF head unit (Freightliner part # A04- 27445-000) replaced in the spring of 2021 after a component within it cracked due freezing. It detects the quality of the DEF Urea, which is 32. When it’s low, the light turns on, signaling the need for a refill. After replacing the sensor, check wiring harnesses for corrosion or loose connections. I assume you have checked and filled the DEF tank. This heavy-duty truck component (module type: DEF Tank Header, mounting: 6-bolt, capacity: 6-gallon) is compatible with: Freightliner M2 106 Cummins 02-16. Shop our Freightliner M2 106 diesel exhaust fluid (def) tank header inventory for OEM & aftermarket parts at FinditParts, America's online marketplace with part number lookup, cross-reference search, and more! Freightliner M2 106 DEF Sensor for sale. 04-35163-000, 04-34398-000 | Freightliner® Def Header Quality Sensor Sending Unit 5 reviews $2,199. The DEF Sending Unit integrates liquid level and temperature measurement functions, as well as a heating function utilizing the engine’s coolant. The level sensor part # 04-30774-001. Replacing the DEF tank header on a Freightliner M2. Code 4769 indicates abnormal rate of change in the DEF tank level sensor signal. A new connector is required for the retrofit. Apr 16, 2025 · For 2010-2013 Freightliner M2 106 Diesel Exhaust Fluid (DEF) Level Sensor Dorman DTautoparts Express (23244) 98. By smart I mean it is data-linked to the ECM's that control engine operation and it only has 4 wires A frequent problem with the DEF system when the light is flashing is the detection of low DEF. Check our parts available online or at our shops near you. Some times it shows 4 lights. 🛡️ All DEF Sensors come with a 365-Days warranty. 7368 Specifications: Width: 80 mm Depth: 487. Dorman HD Solutions - 904-7368 : Diesel Exhaust Fluid Level Sensor. Measure the resistance between pin 1 of the DEF tank level/temperature sensor, harness side, connector and pin 109 of the 120-pin ACM harness side connector. Sep 3, 2025 · Buy 04-35649-002 Diesel Exhaust Fluid Level Sensor 04-35649-001 for Cummins 6 Bolt Freightliner DEF Tank SSI Header: Coolant Level - Amazon. 8% positive b. Oct 27, 2023 · Good morning, After filling my def tanks at a truck stop, my gauge was showing empty and dash alarm was on. Browse our great selection and choose from a variety of features and specs. isted in Table 1 Dec 19, 2022 · This sensor should be inside the DEF tank as it has 3 jobs to do. First truck parts: Supplier of DEF Sensors for Heavy Duty Trucks. Even after replacing the sending unit and cleaning filters, sensor calibration or a faulty DEF dosing control module can cause errors. I have full def tank but the level shows red light blinking. Shop our Freightliner diesel exhaust fluid (def) level sensor inventory for OEM & aftermarket parts at FinditParts, America's online marketplace with part number lookup, cross-reference search, and more! I understand you need to replace the DEF Tank Level Sensor Module on your 2018 Freightliner Jayco M2 chassis RV, and you're experiencing erratic DEF and check engine lights. Either inaccurate def gauge or coolant leak at top of sending unit. Its Description Freightliner A04-27942-000 Fill Level Sensor, UREA Tank, 6 Galvanized Applications: Freightliner M2 112 (2010-2013) Freightliner M2 106 (2009-2017) Cross Reference #: 144819 A0427942000 FTLA04-27942-000 904-7368 9047368 BMP904. New replacement 2010-2013 Freightliner M2 DEF sensor. Check engine light, sluggish performance or erratic diesel exhaust fluid (DEF) levels could point to a failing DEF level sensor. Get your readings right again with this reliable aftermarket Freightliner M2 106 and M2 112 DEF tank level sensor from Raney's Truck Parts! Matches OEM: A0427942000 Aug 6, 2025 · The most frequent culprit behind the “full tank but blinking light” problem is a malfunctioning DEF level sensor. 1. All Def header come with a 365-Days warranty. com store at attractive prices! We'll help you with choosing the right part for your truck. The Apex 2. No parameter changes are required. It monitors the following items-- tank level, tank temperature, and DEF quality. 5% urea and 67. May 28, 2021 · At an AIM rally Robert from Freightliner said they have resolved the DEF sensor failure that has been affecting so many people. Sep 22, 2012 · DEF tem. NOTE: This bulletin applies to Freightliner vehicles equipped with Detroit or Cummins engines and 2013 OBD/GHG14 6-gallon DEF tanks. You also have to clear the codes with the engine manufacturers software, and many times, complete a forced regen or a successful aftertreatment duty cycle. Apr 19, 2019 · 2018 m2 106 freightliner changed nox sensor now my DEF light won't go off. Sep 28, 2024 · About this item 【 Part Number 】DEF Header Unit Level Sensor,Part# 04-31677-000, 0431677000, 04-27881-000, 0427881000 【 Compatible Vehicle 】DEF Header Unit Level Sensor with Freightliner Cascadia Truck 13/23 Gallons. Mar 14, 2025 · Fixing a DEF level sensor can be straightforward. Sorry if this is not the place to ask questions. 58 x 3. This smart sensor has Urea Quality, Level, and Temperature all integrated into it as one unit and reports on the DL7 (J1939-7) Datalink. With so many possibilities, it is hard to diagnose and give you the May 17, 2021 · CEL is on, Got a DTC code P21C5 - DEF level sensor A stuck. When the DEF tank is full but the warning light flashes and limp mode activates, check the DEF quality sensor and wiring harness for faults. This just recently happened to my 2018 freightliner box truck. View all 69 18-wheeler DEF Tanks. 80 mm Diesel Exhaust Fluid (DEF) Level Sensor Item Dimensions LxWxH 24. In the empty and ignored state, vehicle speed will be limited to 5 mph until DEF is detected in the tank. Aug 22, 2025 · Product features： Accurate Level Monitoring: This Diesel Exhaust Fluid Level Senso is precisely engineered for Freightliner vehicles and Cummins engine DEF tanks. The DEF Level Sending unit is used in Selective Catalytic Reduction (SCR) system to reduce emissions pollutants such as NOx (generic term for NO, nitric oxide, and NO 2, nitrogen dioxide) from the engine exhaust gas. The bad news is that there are about 250 items that can turn the warning light on even though the DEF tank is full. This sensor is part of the larger SCR system that also includes the DEF tank, delivery system, injectors, catalyst, and NOx sensors. So start with connector. com FREE DELIVERY possible on eligible purchases The tool helps address issues related to the DEF (Diesel Exhaust Fluid) level sensor and associated fault codes. Fix check engine light, sluggish performance, or erratic DEF levels with this direct-replacement sensor. Call for details we ship everywhere. 2018 Freightliner M2 DEF Level Light Flashing Issue M2 often faces DEF sensor faults and wiring harness voltage loss causing false low DEF warnings. This component plays a crucial role in monitoring the temperature of the DEF fluid stored within its tank. SPN3031 FMI 4 - DEF Tank Temperature Sensor Circuit Apr 26, 2023 · The DEF level sensor, which is part of the DEF sending unit, measures the level of fluid remaining in the DEF tank. The last two Spartan K 3's I have owned, one a 19 with 1,900 miles the DEF sensor failed. Inspect the DEF tank for contamination or air bubbles affecting sensor readings. Supplier of Def header for Heavy Duty Trucks. When the liquid level is low, the DEF level sensor sends a signal to the vehicle’s ECU which then triggers the warning light on the gauges or panel. 8% positive Search our large inventory of New/Used Freightliner CASCADIA DEF Sensors for sale. Park the bus on a level surface, apply parking brake, switch engine off, remove ignition key and chock wheels. A genuine direct replacement meeting OEM specifications for commercial vehicle emission systems EEC 61 REGEN, FREIGHTLINER YELLOW FLASHING LIGHT, HOW TO BYPASS 5 MPH FOR DEF PROBLEM? WHAT TO DO IF YOUR TRUCK SPEED DROP TO 5MPH DUE TO DEF PROBLEM? , TRUCK DERATING SPEED 5MPH HOW TO FIX Get the best deals on Freightliner DEF Tank Commercial Truck DEF Systems when you shop the largest online selection at eBay. The DEF tank was 3/4 full and was not old. ALWAYS check the circuits before condemning the header. If that’s the case, it’s possible that the DEF level sensor connected to the tank's sending unit has malfunctioned. 🚚 We will ship your order on the same day. On a cascadia I’m not sure if you need to drop the tank or not. Sep 11, 2021 · For RVers stranded with bad DEF sensors, here's a gizmo you can built to get you out of trouble. Step-by-step guide to keep your truck running smoothly! You need a def level sensor, it’s in the tank. Shop this DEF Level Module - Freightliner 04-31677-000 today at TruckAC+, your direct source for Heavy-Duty Sensors and more. The use of improper fluid will trigger a decrease in engine performance. 2014 freightliner cascadia. Then, follow a few simple steps to resolve common issues. 2015 Sprinter 2500 2. In a KW or a Pete you don’t. Fault Codes 3868, 4572 and 4677 Caused by Diesel Exhaust Fluid (DEF) Header Malfunction Oct 15, 2021 · Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts. 2 Position the float at the full, midpoint, and empty positions and compare the resistance to that shown in Table 1. Freightliner DEF tanks & headers built for durability and emissions compliance. It helps to reduce harmful emissions, such as nitrogen oxides, by breaking them down into harmless nitrogen and water. Shop today and enjoy same-day shipping! Like and share if this helped you. it is combined with DEF level sensor. First, verify the DEF tank is indeed full and the sensor connector is secure. A flashing red DEF light after sensor replacement usually indicates a faulty or improperly calibrated DEF sensor. The DEF light on your Freightliner is flashing because of a potential issue with the DEF quality sensor in the tank, even if the tank is full. Causes of DEF Light Activation: There are several reasons for the DEF light to activate, including a faulty DEF quality sensor or a low DEF level, which can be resolved by refilling the tank Sep 12, 2025 · Browse Diesel Exhaust Fluid (DEF) Level Sensors For Sale near you on MyLittleSalesman. Regularly clean sensor contacts and ensure proper DEF fluid Nov 21, 2024 · My DEF warning light came on while I was pulling out of Freightliner in Kansas City after a minor service back in 2021. com. Jun 1, 2022 · On location when you see the warning light, even if the tank is full, is that there is a problem in the after-treatment system. How do you know if that DEF tank header fails. I created this video to help people get trucks back on the road and spend realistic money doing so. 5 urea the quality sensor checks this, the temp sensor is used to turn on the def heaters in the tank uses engine coolant and the lines are electrically heated, we have trucks DEF gauge says empty but DEF tank is full. The DEF level sensor is used to indicate how much DEF is left in the tank, and when low it sends a signal to the ECU to show the warning lights. So we have the codes, where should we start? First thing I always do is check Freeze Frame. What could possibly be the problem?? Thank you! If your diesel exhaust fluid level sensor is not functioning as it should, try our quick tips for cleaning to get you back on the road as soon as possible. The header is responsible for being the pickup for DEF as well as the tank Level sensor, fluid quality and temp sensor. Called Spartan and gave them the code: J139 and was advised it’s level sensor and can drive Sep 23, 2021 · DEF sensor failures temporary relief UPDATED - School Bus Fleet Magazine Forums #quality sensor# Freightliner m2# problem solved# after cloudy day coming a sunny day #😎 Customer: My freightliner they just change def sensor but I been driving now is flashing red light what should I do ? Mechanic's Assistant: Just to clarify, which lights are we talking about? Does the light blink at first, then stay solid? Customer: It shows that the DEF is empty while is full Mechanic's Assistant: What's the make, model, and year of your freightliner? Customer: 2016 freight Aug 23, 2024 · The main component implicated in SPN 1761 is the DEF tank level sensor, which measures the level of diesel exhaust fluid in the tank. No; repair the short to circuit ground on the Diesel Exhaust Fluid Tank Temperature Sensor Circuit between the grey 18-pin ATS harness and the ACM. it is weak thing becouse if DEF was spilled on cooper wires they gonna be corroded. These sensors monitor the level, temperature, and quality of DEF, ensuring the efficiency of the SCR system. Enjoy our hassle-free online checkout or call to speak to an expert. You only have to do this if you are derated. The DEF header unit on vehicles with a six-gallon DEF tank is secured to the top of the tank, and contains the DEF level sensor, DEF temperature sensor and coolant and DEF lines. 00 Dec 18, 2020 · Hope to get some feedback from 2016 and newer Freightliner chassis owners. 83 The Computer is not seeing the proper information from the DEF Tank Level/ Temperature/Quality Sensor. This could be caused by a problem with the DEF itself, the pump, the injector, or one of the sensors. Freightliner Trucks reserves the right to discontinue models and to change specifications or design at any time without notice and without incurring obligation. 6. DEF Level & Temperature Sensors are components of the DEF sending unit, typically mounted to the DEF tank. Dealer states the level sensor was probably damaged by a low level condition sometime in the past and because the sensor is not replaceable, the entire IMPORTANT: Descriptions and specifications in this manual were in effect at the time of printing. First, inspect the DEF tank sending unit connector for corrosion or damage. Discover the brand: Freightliner new Diesel Exhaust Fluid (DEF) Level Quality Sensor Header, part number: 04-30774-00. The light bar indicates the level of fluid in the DEF tank. A DEF sensor workaround Jan 14, 2023 · The DEF tank header contains three different sensors and a stainless or coolant acceptable heating coil. This sensor is a smart combo sensor; it does three things, tank level, tank temperature, and DEF quality. Plus my truck keeps de rating after 30mins into driving and 2nd engine light is on help plz. VIN Sep 18, 2020 · Just got a report from dealer on add DEF indicator light on dash indicating DEF needs to be added. 04-31354-004，04-31354-002) is made of high-quality steel, which This diagnostic is typically Diesel Exhaust Fluid (DEF) tank level sensor circuit failed high (shorted to power or an open in the circuit). 1-year warranty included. taofz1s4v xect zabwz cmsw otqx9k3tj 8eafo bai 8m mje 8m8