Frequently Asked Questions

An informed choice is the best choice. These FAQs will answer the most popular questions about our BlueDEF® Diesel Exhaust Fluid.

Q: What is BlueDEF®?

A: BlueDEF® is the fluid (known as Diesel Exhaust Fluid) that is used in Selective Catalytic Reduction (SCR) systems on diesel engines to reduce NOx.

Q: What is Selective Catalytic Reduction (SCR)?

A: SCR is an acronym for Selective Catalytic Reduction. SCR is a technology that uses a urea based diesel exhaust fluid (DEF) and a catalytic converter to significantly reduce oxides of nitrogen (NOx) emissions. SCR is being used by almost all OEM manufacturers.

Q: How does an SCR System work?

A: The purpose of the SCR system is to reduce levels of NOx (oxides of nitrogen emitted from engines) that are harmful to our health and the environment. SCR is the after treatment technology that treats exhaust gas downstream of the engine. Small quantities of diesel exhaust fluid (DEF) are injected into the exhaust upstream of a catalyst, where it vaporizes and decomposes to form ammonia and carbon dioxide. The ammonia (NH3) is the desired product, which in conjunction to the SCR catalyst, converts the NOx to harmless nitrogen (N2) and water (H2O).

Q: What is BlueDEF® for?

A: When used in an SCR system BlueDEF® will reduce the levels of NOx emissions of those engines.

Q: What is the composition of BlueDEF®?

A: BlueDEF® is a high-purity, 32.5 strength urea solution and deionizer water.

Q: What is Urea?

A: Urea is a compound of nitrogen whose aqueous solution generates ammonia when heated. It is used in a variety of industries, including as a fertilizer in agriculture.

Q: Why use a 32.5% urea solution?

A: The 32.5% urea concentration is the lowest freezing point for water urea solutions. Thus, the SCR systems will be calibrated to the 32.5% solution, so that optimum NOx will be reduced during operation.

Q: What is the freeze point of DEF?

A: A 32.5% solution of DEF will begin to crystallize and freeze at 12 deg F (-11 deg C). Freezing does not harm the quality of the DEF solution. Upon thawing, DEF will perform as required.

Q: How do I keep the DEF from freezing? What happens if the DEF freezes in the tank on the vehicle?

A: During vehicle operation, SCR systems are designed to provide heating for the DEF tank and supply lines. If DEF freezes when the vehicle is shut down, start up and normal operation of the vehicle will not be inhibited. The SCR heating system is designed to quickly return the DEF to liquid form and the operation of the vehicle will not be affected.

Q: Does DEF expand when frozen?

A: Yes, DEF expands by approximately 7% when frozen. DEF packaging and tanks are designed to allow for expansion.

Q: Are there any quality standards the DEF must meet?

A: Yes, DEF needs to meet the ISO 22241 quality standard.

Q: Is it hazardous, toxic or flammable?

A: No, BlueDEF® is classified as non-hazardous, non-toxic or flammable.

Q: Is DEF corrosive?

A: DEF is corrosive to copper, brass, and aluminum as well as carbon steel. Only approved materials as listed in the ISO 22241 standards should be used in contact with DEF.

Q: Why is the SCR system, requiring DEF being incorporated into diesel vehicles?

A: The EPA has mandated the reduction of NOx emissions released into the environment. In particular, the new 2010 requirements.

Q: How will BluDEF® be carried on the vehicle?

A: BlueDEF® is stored in a designated tank on the vehicle. It is then replenished like fuel.

Q: What happens if the vehicle runs out of DEF?

A: Vehicles will be equipped with a DEF gauge on the dash to alert the driver on the fluid level. If the level becomes low an alert will let the driver know the DEF level needs to be replenished. If the driver runs out completely the vehicle power will be reduced to encourage the operator to refill the DEF tank. Once the DEF tank is refilled, normal power levels will be restored on the vehicle.

Q: Does BlueDEF® mix with fuel?

A: No, It is not an additive. It is sprayed into the exhaust stream where it reacts with the NOx in the SCR system to form nitrogen and water.

Q: How much DEF will I need?

A: DEF is consumed at a rate of approximately 2-3% by volume to diesel consumption.

Q: Does the BlueDEF® program offer equipment?

A: Yes, we offer a full line of dispensing solutions for fleets, truck stops and all other end users.

Current Technical Service Bulletins (TSBs) for Selective Catalytic Reduction Systems (SCR)?


2017- 2018

TSB/Campaign Number 18-2278 – Some 2017-2018 F-Super Duty vehicles equipped with a 6.7L diesel engine may exhibit a concern where the DEF level indicator appears to be stuck in the full position. Corrective action would be to reprogram the PCM to latest calibration.


2017- 2019

TSB/Campaign Number 18-2365 – Some 2017-2019 F-Super Duty vehicles equipped with a 6.7L diesel engine may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble codes (DTCs) U029D and/or P2209 in the powertrain control module (PCM). This may be due to water intrusion. Corrective action would be to inspect the NOx sensor module for moisture and corrosion and replace the sensor module and the associated wire harness assembly.


2011- 2016

TSB/Campaign Number 16-0154, 16-0034 – Some 2011-2016 F-Super Duty vehicles equipped with a 6.7L diesel engine, may exhibit an illuminated MIL with DTCs P208E and/or P218F stored in the powertrain control module (PCM) memory due to urea crystals forming on the reductant injector nozzle. Corrective action would be to follow the cleaning process for the reductant injector.


2015 – 2016

TSB/Campaign Number 17-2250 – Some 2015-2016 F-Super Duty pickup vehicles equipped with a 6.7L engine may exhibit an illuminated MIL with DTC P2002 only. Corrective action would be to Replace the catalyst and particulate filter assembly and reprogram the PCM to the latest calibration.


2014 – 2015

TSB/Campaign Number 15-0008 – Some 2014-2015 F-Super Duty vehicles equipped with a 6.7L engine and built on 11/7/2013 and through 12/10/2014 may exhibit a MIL illuminated with DTC P207F. Corrective action would be to reprogram the (PCM) to the latest calibration.


2014 – 2015

TSB/Campaign Number 15-0016 – Some 2014-2015 F-Super Duty vehicles equipped with a 6.7L diesel engine and built from 11/7/2013 through 12/10/2014 may exhibit a malfunction indicator lamp (MIL) illuminated with diagnostic trouble codes (DTC): P209F, P208E or P2043. This is indicated in the instrument panel cluster (IPC) with warning message displaying Exhaust Fluid System Fault. A calibration is available to improve the monitors for the listed DTCs with the powertrain control module (PCM) software. Corrective action would be to reprogram the powertrain control module (PCM) to the latest calibration and reset/clear the diesel particulate filter (DPF) parameter tables.


2013 – 2016

TSB/Campaign Number 16-0133 – Some 2013-2016 F- Super Duty vehicles equipped with a 6.7L diesel engine may exhibit an illuminated MIL with DTC P218F (reductant no flow detected)

Stored in the powertrain control module (PCM) memory. Corrective action would be to reprogram the PCM to the latest calibration.


2011 – 2014

TSB/Campaign Number 15-0021 – Some 2011-2014 F-Super Duty vehicles equipped with a 6.7L diesel engine and built on or before 11/6/2013 may exhibit various drivability concerns with an illuminated malfunction indicator lamp (MIL) with one or more diagnostic trouble codes (DTCs). Corrective action would be to Complete any applicable open recalls on the vehicle as they contain powertrain control module (PCM) software updates that address the previously released concerns listed.




TSB / Campaign Number – LI49.20-P-053142 On some 2015 Mercedes BLUETEC GL350’s the instrument cluster displays the message of low AdBlue (DEF) level although the fill level of the AdBlue tank is sufficient. The following fault codes may be stored in the engine control unit: DTC fault codes 16D000, 16D100,16CC00, 16CD00, 16CE00, 16CF00 the fill level of the AdBlue® tank is too low. Instrument Cluster might display “16 starts remaining”. This fault code usually occurs normally if the AdBlue (DEF) level is under about 1.5 gallons (5 liters). Due to software issue, the system calculates erroneous result. Corrective action would be to perform the available software update.


Dodge / RAM:

2014 – 2015

TSB/Campaign Number – 25-001-15 REV. A

Some Dodge Ram’s equipped with a 6.7L Diesel engine may have a manufacturing defect in the DEF level sensor. It may have occurred if the DEF level sensor was built within the time frame listed above. There may be a Malfunction Indicator Lamp (MIL) illuminated. Upon further investigation a technician may find one or more of the following Diagnostic Trouble Codes (DTCs). P203B – Reductant Level Sensor Circuit Performance, P203C – (Diesel Exhaust Fluid) Reductant Level Sensor Circuit Low, P203D – (Diesel Exhaust Fluid) Reductant Level Sensor Circuit High. Corrective action would be to replace the Defective DEF Level Sensor.


Land Rover

2017 2018

TSB/Campaign Number – LTB01249NAS2 – Land Rover Discovery (LR) On some 2017 Land Rovers a “DEF (Diesel Exhaust Fluid) Dosing Malfunction” and/or “No Engine Restarts Message in XXX Miles” message may be displayed on the Instrument Cluster (IC). Upon further diagnosis, the technician may find DTC (Diagnostic Trouble Code) P208A-13 and P208C-11 stored in the Powertrain Control Module (PCM). Cause: PCM software error. Solution: Computer software update.

Land Rover

2016 – 2017

TSB/Campaign Number – LTB01084NAS1– Land Rover Discovery (LR) On some Land Rover Discovery and Range Rover Sport models with a V6-3.0L DSL Turbo engine, a Malfunction Indicator Lamp (MIL) may be illuminated with “No Engine Restarts in XXX miles, or Incorrect Diesel Exhaust Fluid Quality Detected” warning message displayed on the Instrument Cluster. During diagnosis, the technician may find Diagnostic Trouble Code (DTC) P2BA9-00 and/or P2BA9-92, which may be accompanied by DTCs P2BAE and P2BAF, stored in the Powertrain Control Module (PCM). Cause: Sensitivity of the PCM software related to the Selective Catalyst Reduction (SCR) control, or Incorrect Diesel Exhaust Fluid (DEF), or an air leak in the engine intake system. Solution: Take to the Dealer.  

Land Rover

2017 – 2019

TSB/Campaign Number N241NAS2– On some Land Rover and Range Rovers a potential issue has been identified on certain vehicles within the listed Affected Vehicle Range where a “Diesel Exhaust Fluid Malfunction” warning message is displayed in the message center or the MIL (Malfunction Indicator Lamp) may be illuminated on the Instrument Panel Cluster (IPC). Action: Affected vehicles already in the hands of customers should be updated at the next available opportunity.

Discovery (LR)                         2017-2019       VIN 000001-093227

Discovery (LR)                         2019                 VIN 400488-402827

Range Rover Sport (LW)          2017-2019       VIN 100436-838935

Range Rover (LG)                    2017-2019        VIN 297609-539983




TSB/Campaign Number PIP5510C: DTC P20EE – Diagnostic Procedure for SCR System (Nov 3, 2017)

All Chevrolet Silverado & GMC Sierra 2017-2018 6.6L Condition: The Malfunction Indicator Lamp (Check Engine Light) is coming on. Corrective action would be to perform a complete diagnostic for any trouble code or symptom found.  Then perform the ECM software update referred to in campaign 17337.



TSB/Campaign Number 16-NA-377 – Service Emission System Message with DTC P206B Set/Stored – (Sep 6, 2017)

Chevrolet Colorado 2017-2018, 2.8L

Chevrolet Cruze 2017-2018, Gen II 1.6L

Chevrolet Equinox 2018, 1.6L

Chevrolet Express 2017-2018, 2.8L

Chevrolet Silverado 2017-2018, 6.6 L

GMC Canyon 2017-2018, 2.8L

GMC Terrain 2018, 1.6L

GMC Savana 2017-2018, 2.8L

GMC Sierra 2017-2018, 6.6L

After recently filling the DEF tank with automatic dispensing nozzles, and the ignition in the on position, a technician may find DTC P206B set or stored in the history. It has been found that some DEF fill equipment uses pumps that create a high level of temporary aeration of the DEF fluid being dispensed in the tank. Corrective action would be to reduce the likelihood of this issue occurring, the vehicle should be keyed off during filling of the DEF tank.



TSB/Campaign Number PIP5614 – Check Engine Light on with DTCs P0046, P113B and / or P206B. – (Dec 10, 2018) Chevrolet Silverado 2018 6.6L L5P and GMC Sierra 2018 6.6L L5P Condition:  The Service Engine Soon (SES) light is on. Technicians may find one of the following DTCs

P0046 – Turbocharger Boost Control Position Performance

P113B – Exhaust Gas Temperature Sensor 1 Not Plausible

P206B – Reductant Quality Sensor Circuit Performance

This may be due to a software anomaly. Corrective action would be to update the ECM for the codes listed above.



TSB/Campaign Number 17-NA-219 – Diagnostic Tip for Malfunction Indicator Lamp (MIL) Illuminated, Auto Stop Inoperative – DTC U029D, U029E, P249D, P249E Set – (Aug 31, 2017)

Chevrolet Colorado 2016- 2018, 2.8L

Chevrolet Express 2017-2018, 2.8L

Chevrolet Silverado 2017-2018, 6.6L

GMC Canyon 2016 2018, 2.8L

GMC Savana 2017 2018, 2.8L

GMC Sierra 2017 2018, 6.6L

Concern: The MIL is illuminated. The technician may find one or more of the following DTCs set: U029D, U029E, P249D, P249E. This has been found to be caused by moisture intrusion past a damaged or missing seal located in the connector for the NOx sensor wiring harness. If diagnostics lead to NOx sensor replacement, corrective action would be to inspect the mating chassis electrical connector for corrosion and clean or replace as necessary.

Diesel Exhaust Fluid

Cette Garantie Limitée Pure Garantie (“Garantie”) s’applique au fluide d’échappement diesel de marque BlueDEF® (“BlueDEF” ou “Produit”) fourni et vendu par Old World Industries, LLC (“Old World”) au Propriétaire de l’équipement (défini ci-dessous) et comprend tous les termes et conditions énoncés ci-dessous. Cette garantie est gratuite. Personne ne peut facturer des frais pour cela. BlueDEF® est destiné à être utilisé dans les moteurs diesel des véhicules et des équipements fixes (“Équipement”) qui sont équipés d’un système de Réduction Catalytique Sélective (“Système SCR”). BlueDEF® est formulé, mélangé et testé pour répondre à la norme ISO 22241 pour la pureté et la composition et est un fluide d’échappement diesel certifié par l’American Petroleum Institute (“API”).

OWI garantit pendant une période de 90 jours à compter de l’achat du Produit (la “Période de garantie”) qu’il paiera le propriétaire de l’équipement (le “Propriétaire de l’équipement”) pour la réparation ou le remplacement, au choix d’Old World, de ces parties du Système SCR qui tombe en panne ou montre une usure anormale, comme déterminé par Old World, en conséquence directe de l’utilisation de BlueDEF® hors spécifications et/ou défectueux pendant la période de garantie; à condition que: (1) le système SCR a été correctement utilisé et entretenu dans des conditions de fonctionnement normales et conformément aux spécifications et recommandations du fabricant de l’équipement d’origine; (2) BlueDEF® a été acquis, installé, utilisé, transporté, stocké et entretenu conformément aux spécifications du produit et aux instructions fournies par Old World sur l’étiquette du produit ou ailleurs; (3) le Propriétaire de l’équipement a conservé des registres et autres éléments vérifiant les conditions énoncées en (1) et (2) immédiatement ci-dessus, y compris les reçus de vente BlueDEF®, l’emballage du produit et les codes de date, les bons de réparation, les enregistrements de maintenance et de service, et le produit conservé échantillons; et (4) le propriétaire de l’équipement certifie qu’aucun autre produit n’a été ajouté ou mélangé avec le BlueDEF® en question.


Droits légaux des États: cette garantie vous donne des droits légaux spécifiques, et vous pouvez également avoir d’autres droits qui varient d’un État à l’autre. Certains états n’autorisent pas les limitations sur la durée d’une garantie implicite, de sorte que la limitation ci-dessus peut ne pas s’appliquer à vous. Certains états n’autorisent pas l’exclusion ou la limitation des dommages accessoires ou consécutifs, de sorte que la limitation ou l’exclusion ci-dessus peut ne pas s’appliquer à vous.

Pour faire une réclamation au titre de la garantie, le propriétaire de l’équipement doit procéder comme suit:

  1. Pendant la Période de Garantie, informez Old World dans les sept (7) jours suivant la découverte des dommages au numéro indiqué ci-dessous.
  2. Il vous sera alors demandé d’envoyer un ou plusieurs des articles requis ci-dessus, y compris une preuve d’achat, à l’adresse indiquée ci-dessous.
  3. Vous devez également permettre à Old World ou à son(ses) agent(s) désigné(s) d’inspecter et de tester le système SCR concerné, ou les pièces déclarées endommagées.
  4. De plus, vous devez fournir des échantillons du Produit en question pour aider à déterminer s’il était la cause du dommage réclamé..

Old World Industries, LLC
3100 Sanders Rd.
Northbrook, IL 60062
Attention: BlueDEF® Warranty Claim