How to clear service def system message duramax

1. Collect a DEF sample of about 150 ml (5 oz.) from the DEF tank in a clear container. The DEF sample should be clear with no obvious coloration when held up to a light. As clean DEF is clear, contamination by any common automotive fluids will cause the DEF to exhibit a trace of color associated with a specific contaminate.

It can also be a failed or failing DOC or DPF. If you have a scanner or data display that shows the temp sensors in the exhaust you should see the DPF inlet and outlet temps come up around 1200 degrees or so during regen. If one is lower than the other by a significant margin that can indicate an issue.2020 Duramax Service DEF System Alert. Drove the truck as normal all last weekend w/ no issues. Went to remote start and go to work Monday AM, no remote response. Get into the truck and start, immediately get engine light and "Service Emission System" warning, 174 miles until 65 MPH max speed. Later in the day the message changes to "Service ...Nov 18, 2023 · There are four primary emissions systems on the L5P. EGR, DOC, SCR, and DPF. All of these systems with the exception of EGR sit within the exhaust system. Deleting the L5P DPF will remove not only the DPF but also the DOC and SCR components, and the need for DEF fluid. The EGR must be deleted separately. Some customers may comment that the MIL is illuminated and a reduced power message with a Service Emissions System message as well. Some technicians may one or more of the following DTCs set in the Engine Control Module (ECM): • P20C1: Reductant Heater 3 Control Circuit • P21DD: Reductant Tank Heater 1 Low CurrentA 2012 GMC 2500HD with a LML (160,000KM on engine). I had just recently replaced the coolant o-ring in the flywheel housing cause one was leaking coolant. Once the repair was complete the service emission system message appeared in the IP but no codes are set. A successful service regen was done with a tech 2, and no codes set …Mar 1, 2023 ... 5 NEW Ways to Remove a ... DEF Injector | Ram 2500 Service DEF System Message ... Def exhaust fluid - FYI - 2021 Chevrolet [ p21DD code Duramax ].

The DEF system reset procedure is simple and only takes a few minutes to complete. To reset the Duramax DEF system: 1. Start the engine and let it idle for a few minutes to warm up. 2. Locate the DEF fill port on the side of the vehicle (it will have a blue cap). 3. Remove the cap from the fill port and insert the funnel.Getting a DEF filter cleaned generally costs around $1500 dollars in labor. If the filter is damaged and needs to be replaced, the parts can cost as much as $2000 to $5000 dollars.. A complete DEF is expensive and complex. Luckily, when it comes time to perform maintenance on a DEF system, most of the time it just needs to be cleaned.When your Duramax diesel displays a water in fuel message, the first step is to drain the water from the fuel filter water separator. This component is specifically designed to capture water before it enters the engine. To do this: Locate the water separator near the fuel filter. Place a container underneath to catch the water.This letter was intended to make you aware 2016 GMC Sierra models have a condition which causes an offset in temperature sensor in diesel emissions reduction fluid (DEF) tank reservoir or causes def heater performance to degrade. IF this occurs the Check Engine light will illuminate the "service Exhaust fluid system or "Service Emissson …Dec 18, 2022 · Here are some tips on how to keep your Duramax fully functional and clean: 1. Check the air filter regularly. Replacing the air filter can help reduce NOx emissions. 2. Keep the fuel system clean. Scanning for clogged filters, dirty injectors, and fouled-up injection systems can help prevent buildups of pollutants that could cause an emission ... Jul 13, 2022 · Reductant tank heater 1 is a common failure causing vehicle to enter limp mode, requiring DEF tank reservoir replacement.Duramax P21DD P20B9#automotive #cars... About 2 weeks ago we were traveling to Savannah with 5th wheel in tow and the "service Def System" message appeared. Truck has 8600 miles. Once the message disappeared and display went back to the vehicle info I scrolled down to the messages and it was gone. Hmmm cool it cleared its self. 2 days later it came back followed by the CEL.In This video I go through all the steps to troubleshoot Poor Quality DEF Warning.

2020 Duramax Service DEF System Alert. Drove the truck as normal all last weekend w/ no issues. Went to remote start and go to work Monday AM, no remote response. Get into the truck and start, immediately get engine light and "Service Emission System" warning, 174 miles until 65 MPH max speed. Later in the day the message … The Service Def System Message is an indication that there is an issue with the Diesel Exhaust Fluid (DEF) system in your Duramax vehicle. DEF is a solution that helps in reducing harmful emissions from the vehicle’s exhaust system. When the DEF system malfunctions, the onboard computer detects the issue and triggers the Service Def System ... It is not possible to recall a sent email in Hotmail, because the Hotmail email system does not currently offer that service. However, Gmail does offer that service. To recall an e...566 posts · Joined 2013. #2 · Mar 31, 2018. For a DEF quality code to clear, it has to run and successfully pass the Reluctance Fluid Quality Test. This is a running stationary test done with the factory service tool. It will not clear without that test completing. If you live in Washington, your truck is not subject to emissions testing due ...Nov 12, 2017 · Service emissions message. We've had our 2015 3500HD for about a year now. First diesel I've owned. Changed the fuel filter today for the first time. After taking quite a few times priming it is got it to start. Upon starting it now reads on the dash service emissions see owner's manual 175 miles until 65 mph max.

Gun show roanoke virginia.

158 posts · Joined 2021. #13 · May 4, 2022. The DEF sensor inside the tank is known to have issues. Mostly due to DEF crystallizing and giving false info to the sensor. And depending on how much DEF you have in the tank at that moment, the crystal might dissolve and clear the code. Sometimes it doesn’t.10. Jan 16, 2022. #1. Had the message Service Def System see dealer message pop up today while towing my camper home. Message stayed up for about 15-20 minutes then completely went away. Truck is a 2020 2500, 11K miles. I pickup it up Pre-Owned with 6500 miles on it. Since ownership for 1 month I’ve added 5 gallons of Platinum Blue Def and ...It helps to keep the emission system clean and void of substances that are capable of harming the car’s engine, other people, and the environment. Engaging in a regular emission system service will help to keep your car’s engine running perfectly without any glitches. It will also help the overall performance of the engine and keep it ...Nov 17, 2019 ... I Asked Diesel Repair ... Experts Shares Diesel Exhaust Fluid Info Saving You Major Engine Repairs ... You Can Now Tune And Delete A L5P Duramax ...To reset the Duramax DEF system: 1. Start the engine and let it idle for a few minutes to warm up. 2. Locate the DEF fill port on the side of the vehicle (it will …

It ran fine for the first 3,200 miles then upon startup this evening after filling up at the Shell fuel station in Frederick, MD off I-270/85, it immediately threw up the yellow engine warning icon and said "Service Emmissions System", see owner's manual, 175 mile limit and 65 mph max speed. WTF. The Service Def System Message is an indication that there is an issue with the Diesel Exhaust Fluid (DEF) system in your Duramax vehicle. DEF is a solution that helps in reducing harmful emissions from the vehicle’s exhaust system. When the DEF system malfunctions, the onboard computer detects the issue and triggers the Service Def System ... In today’s fast-paced digital world, communication is key for businesses to stay connected with their customers. One effective way to reach a large audience quickly and cost-effect...M. mschreib81 Discussion starter. 5 posts · Joined 2022. #1 · Jul 1, 2022. I purchased a 2022 GMC Sierra 3.0 AT4 refreshed on 5/31, it currently has 1700miles, 3 days ago on my way to work I got a check engine light and a notice to service emissions systems. Once at the dealer they told me that it was most likely due to using biodiesel …Mar 1, 2023 ... 5 NEW Ways to Remove a ... DEF Injector | Ram 2500 Service DEF System Message ... Def exhaust fluid - FYI - 2021 Chevrolet [ p21DD code Duramax ].The DEF system reset procedure is simple and only takes a few minutes to complete. To reset the Duramax DEF system: 1. Start the engine and let it idle for a few minutes to warm up. 2. Locate the DEF fill port on the side of the vehicle (it will have a blue cap). 3. Remove the cap from the fill port and insert the funnel. The Duramax diesel engine available on 2011-2016 GM full-size trucks and vans requires injection of Diesel Exhaust Fluid (DEF) as an integral part of the exhaust after-treatment process that reduces emissions. DEF is a colourless, clear solution of water and nitrogen-based urea product that has 32.5 percent urea by weight. 11 posts · Joined 2015. #1 · Jan 1, 2016. I picked up my new 2016 Denali HD from my dealer today for the second time, and after I got home it is now throwing a "Service Exhuast Fluid System" "Speed limited to 65 mph after 82 miles." I initially thought it was low on DEF, so I added 5 gallon, and then realized it was saying "Service" and not ...Dec 1, 2021. #4. MORE INFO ON MY 2012 GMC K3500 LML DURAMAX. EARLY DEC, 2021. ODOMETER MILES 76200. TSB'S AND GM'S SCA'S OR SPECIAL COVERAGE ADJUSTMENT program. I found this info by googling special coverage adjustment with the numbers below. Two apply to me thus far. SPOKE WITH TABBY AT …

To clear the DEF System Message in your Duramax truck, you’ll need to follow a few simple steps. First, you’ll need to understand what the message means and why it’s important to clear it. Next, you’ll need to gather the essential tools you’ll need to …

Feb 17, 2020 · Last weekend I got the "Service Emission System" message and the Check Engine light came on. ... got a message to service DEF system. Dealer found shorted DEF tank ... Wait for up to 30 seconds with the engine running for the Exhaust Fluid Empty DIC message to clear. If the vehicle is driven prior to the Exhaust Fluid Empty message clearing, the vehicle will still be speed limited. If the Exhaust Fluid Empty message clears while driving, the vehicle must be brought to a complete stop to release the speed ...A 2012 GMC 2500HD with a LML (160,000KM on engine). I had just recently replaced the coolant o-ring in the flywheel housing cause one was leaking coolant. Once the repair was complete the service emission system message appeared in the IP but no codes are set. A successful service regen was done with a tech 2, and no codes set during or after ...Once it got to about 75 miles it reset itself (may have been from starting it multiple times) and hasnt been back since. Service dept said its most likely from the temperature since it was about 108 that day, but they "werent sure without rooting around in the system". 2012 GMC Sierra 2500 CCSB. Carbon Metallic.Feb 25, 2022 ... GM Duramax: "Service Emissions System" but no DTCs?? ... How To FULLY DELETE L5P DURAMAX 2017-2023 ... Experts Shares Diesel Exhaust Fluid Info ...The PCM will turn off the MIL when the diagnostic runs and passes in three consecutive drive cycles, and will turn off the “Service DEF System See Dealer” EVIC message only when the diagnostic runs and passes, or the PCM is reflashed. Clearing the code will not erase the message. Cause: DEF QUALITY SENSOR CONNECTOR …A 2012 GMC 2500HD with a LML (160,000KM on engine). I had just recently replaced the coolant o-ring in the flywheel housing cause one was leaking coolant. Once the repair was complete the service emission system message appeared in the IP but no codes are set. A successful service regen was done with a tech 2, and no codes set …Your diesel car or truck can throw a Service DEF System message on the dashboard. Don't panic when this message pops up - just learn how to reset it correctly.Reductant tank heater 1 is a common failure causing vehicle to enter limp mode, requiring DEF tank reservoir replacement.Duramax P21DD P20B9#automotive #cars...Got called in to a shop 2 hours away to look at a 2012 GMC Duramax Diesel that is stuck in LIMP MODE due to an Emissions System fault.Shop owner already repl...

Adamskeegan efficenter.

Migdalia's caribbean beauty.

The Duramax diesel engine available on 2011-2016 GM full-size trucks and vans requires injection of Diesel Exhaust Fluid (DEF) as an integral part of the exhaust after-treatment process that reduces emissions. DEF is a colourless, clear solution of water and nitrogen-based urea product that has 32.5 percent urea by weight. Crystals obstruct the sensor and affect the level of accuracy. As a result, the computer will pick up on this and display the ” Service DEF System See Dealer” warning message. 5. Low Diesel Exhaust Fluid. The fourth and final reason for the “Service DEF System See Dealer” warning is that the fluid level has dropped too low. Mar 1, 2023 ... 5 NEW Ways to Remove a ... DEF Injector | Ram 2500 Service DEF System Message ... Def exhaust fluid - FYI - 2021 Chevrolet [ p21DD code Duramax ].10. Jan 16, 2022. #1. Had the message Service Def System see dealer message pop up today while towing my camper home. Message stayed up for about 15-20 minutes then completely went away. Truck is a 2020 2500, 11K miles. I pickup it up Pre-Owned with 6500 miles on it. Since ownership for 1 month I’ve added 5 gallons of Platinum Blue Def and ...Delete the highlighted code and start the vehicle. The warning message should be gone. If the warning message does not disappear after starting the vehicle, turn the engine ON and OFF five to six times. You can then clear the codes again. This is a first-aid remedy and should let you reach the dealer.I've been considering doing a delete - is now the time to take that plunge? Reactions: Admin. Save Share. Like. ... got a message to service DEF system. Dealer found shorted DEF tank heater. Replaced it. Replaced reservoir. ... A forum community dedicated to Chevy and GMC Duramax diesel owners and enthusiasts. Come join the …When your Duramax diesel displays a water in fuel message, the first step is to drain the water from the fuel filter water separator. This component is specifically designed to capture water before it enters the engine. To do this: Locate the water separator near the fuel filter. Place a container underneath to catch the water.Apr 11, 2018 · 566 posts · Joined 2013. #2 · Apr 12, 2018. If the pump module was replace, you need to perform the Tech-2 Reductant System Reset. Each one of the three DEF heaters needs to be commanded on for 10 seconds. 2013 Chevrolet 2500HD LTZ Z71. The Service Def System Message is an indication that there is an issue with the Diesel Exhaust Fluid (DEF) system in your Duramax vehicle. DEF is a solution that helps in reducing harmful emissions from the vehicle’s exhaust system. When the DEF system malfunctions, the onboard computer detects the issue and triggers the Service Def System ... 2016 Chevy 2500HD: 5” Rough Country lift with 4”blocks in rear, CP3 conversion, 3” down pipe, Flo Pro 4” NM, Full EGR delete with both sides up pipes, 64mm drop in turbo, Injen cold air intake, Autocal with Mitch Cooper 5tunes/trans tune, CCV delete, Edge CTS3 monitor with Manifold EGT probe, 40” RC curved light bar mod in …Junk hauling services are a great option if you’re looking to clear out junk and debris but don’t want to do the heavy lifting. This is a guide to finding the right junk hauling se...Mar 9, 2020 · GM has issued service bulletins #PIP4887A and #12-06-04-002E to address a Service Exhaust Fluid System Message and trouble codes P203D, P21AB, or P21B0 on the trucks listed below. If you see the “Service Exhaust Fluid System” and a “See Owner’s Manual Now” message displayed on the instrument cluster and scan the vehicle and find ... ….

Share. BalderVerdandi. • 2 yr. ago. EFI Live or EZ Lynk will be your best options to "turn off" the DEF system. You can do what's called a "California delete" - remove the spring and plunger on the intake side, unplug the electronics on the engine, remove the DPF and replace it with a piece of 4 inch exhaust pipe (some include this with their ... I got the "Diesel Particulate Filter needs cleaning" message and hit start (while driving) and then the "Service Emissions System" message came up. It stayed on for about 40 miles of highway driving and then went away; Diesel Particulate Filter page says "Filter is Clean" CEL is still on, however. This occured after the following recent ...Service emissions message. We've had our 2015 3500HD for about a year now. First diesel I've owned. Changed the fuel filter today for the first time. After taking quite a few times priming it is got it to start. Upon starting it now reads on the dash service emissions see owner's manual 175 miles until 65 mph max.On the 2016 Chevrolet Silverado Duramax the DIC will show differing service messages, this video shows how to use them and reset these readings.Visit http://...Once it got to about 75 miles it reset itself (may have been from starting it multiple times) and hasnt been back since. Service dept said its most likely from the temperature since it was about 108 that day, but they "werent sure without rooting around in the system". 2012 GMC Sierra 2500 CCSB. Carbon Metallic.FOR COMPLETE KITS IN THE STATES CLICK HERE https://shrsl.com/3te1mFOR COMPLETE KITS IN CANADA CLICK HERE https://www.dirtydieselcustom.ca/ and use DARKIRON5 ...2020 Duramax Service DEF System Alert. Drove the truck as normal all last weekend w/ no issues. Went to remote start and go to work Monday AM, no remote response. Get into the truck and start, immediately get engine light and "Service Emission System" warning, 174 miles until 65 MPH max speed. Later in the day the message …You wont need a DEF delete kit. When you delete the DPF is gets rid of all the emissions. EGR and DPF. The UREA tank ''DEF Tank" can be removed. once the tune is loaded the EGR is to unplugged and nothing else. The truck is …2012 6.6 DEF continuous problems. Hi all, I'm here for help. I have a 2012 GMC 2500 6.6 I have 115,000 miles on it and over the past 50,000 miles I've had to have the DEF injector replaced and the entire DEF tank replaced. Last night I got the "poor" DEF fluid quality message with speed restrictions in 99 miles. How to clear service def system message duramax, I'm getting a "Low Quality DEF" warning on the DIC and the only code that pops is P249D - that code looks like it could be a bad DEF injector. The last time I saw the DEF gauge, it said 24%, before the warning popped up (it really sucks that you can't use the DIC at all while the warning is active). So I added a box of DEF to attempt to dilute ..., I was just cheaper to not put one on there. Anyway, the dealer removed the fill tube at the top of the tank and drained it from there (after I told them I didn't think they needed to drop the tank). I really needed a tire rotation so that plus the drain and refill with GM DEF came to $200., For a DEF quality code to clear, it has to run and successfully pass the Reluctance Fluid Quality Test. This is a running stationary test done with the factory …, Allow the pressure to build for 30 s. Observe the scan tool Reductant Pressure sensor parameter. The reading should be between 425-575 kPa and there should be no leaks in the system. 6. Engine idling, command each GPCM Reductant Heater 1, 2, and 3 ON for 10 seconds with a scan tool. The DEF lamp should turn OFF., Allow the pressure to build for 30 s. Observe the scan tool Reductant Pressure sensor parameter. The reading should be between 425–575 kPa and there should be no leaks in the system.Engine idling, command each GPCM Reductant Heater 1, 2, and 3 ON for 10 seconds with a scan tool., Feb 17, 2020 · Last weekend I got the "Service Emission System" message and the Check Engine light came on. ... got a message to service DEF system. Dealer found shorted DEF tank ... , Applies to 2020-2022 GMC and Chevy trucks with the Duramax. Replacing the DEF tank assembly on a 2020 GMC 2500hd. Applies to 2020-2022 GMC and Chevy trucks with the Duramax., Once it got to about 75 miles it reset itself (may have been from starting it multiple times) and hasnt been back since. Service dept said its most likely from the temperature since it was about 108 that day, but they "werent sure without rooting around in the system". 2012 GMC Sierra 2500 CCSB. Carbon Metallic., Just unplug the water sensor. The water in fuel message will go away. The sensor switch closes the circuit to ground. There is a short in wiring. Check for exposed wires.This is not complicated. Ground to wire, message turns on. No ground no message. There are two wires going to sensor. One goes to ground The other goes to wiring …, 1386 posts · Joined 2015. #8 · Nov 22, 2015. its almost guaranteed sensors on a 2011. They can force a regen at the dealership to burn off whats in the DPF. 2016 GMC 3500HD Denali CCLB - 27,035 miles. 2015 GMC 2500HD SRW/CCLB 39,368 miles- SOLD. 2011 CHEV 2500HD SRW/CCSB 133,597 miles - SOLD., CNS8888. 391 posts · Joined 2015. #10 · Dec 17, 2017. What I've read is that when the temps are low, like the 21F shown on your dash, the DEF will start to freeze and expand setting off a sensor. Once the DEF's contracted back by turning back fully to liquid, the message goes away because the sensor is no longer tripped., Oct 10, 2015 ... A faulty reductant fluid injector (DEF injector) caused this shuttle bus to go into speed limited mode., On the 2016 Chevrolet Silverado Duramax the DIC will show differing service messages, this video shows how to use them and reset these readings.Visit http://..., Crystals obstruct the sensor and affect the level of accuracy. As a result, the computer will pick up on this and display the ” Service DEF System See Dealer” warning message. 5. Low Diesel Exhaust Fluid. The fourth and final reason for the “Service DEF System See Dealer” warning is that the fluid level has dropped too low., Last weekend I got the "Service Emission System" message and the Check Engine light came on. ... got a message to service DEF system. Dealer found shorted DEF tank ..., Condition/Concern: A dealer may encounter a customer concern of an Exhaust Fluid Quality Poor message displayed on the DIC. The dealer may or may not find DTCs stored. An Exhaust Fluid Quality Poor message can be displayed with no DTCs. The Exhaust Fluid Quality Poor DIC message notifies the customer that the ECM has detected a drop in the SCR ..., at 28,000 miles, got a message to service DEF system. Dealer found shorted DEF tank heater. ... A forum community dedicated to Chevy and GMC Duramax diesel owners and ..., Here’s how the system tackles this: When diesel fuel burns in the engine, it creates NOx gases. These gases move through the exhaust system and, just before reaching the SCR catalyst, the fluid is injected. The heat in the exhaust turns DEF into ammonia. When the ammonia mixes with NOx in the presence of the SCR catalyst, a …, Once it got to about 75 miles it reset itself (may have been from starting it multiple times) and hasnt been back since. Service dept said its most likely from the temperature since it was about 108 that day, but they "werent sure without rooting around in the system". 2012 GMC Sierra 2500 CCSB. Carbon Metallic., The PCM will turn off the MIL when the diagnostic runs and passes in three consecutive drive cycles, and will turn off the “Service DEF System See Dealer” EVIC message only when the diagnostic runs and passes, or the PCM is reflashed. Clearing the code will not erase the message. Cause: DEF QUALITY SENSOR CONNECTOR …, 158 posts · Joined 2021. #13 · May 4, 2022. The DEF sensor inside the tank is known to have issues. Mostly due to DEF crystallizing and giving false info to the sensor. And depending on how much DEF you have in the tank at that moment, the crystal might dissolve and clear the code. Sometimes it doesn’t., 33 posts · Joined 2020. #12 · Aug 27, 2020. I tooky 19 in for the recall plus block heater and since I did I have not got any warnings for def level it always reads def ok I've noticed it is using less 19 dmax has 31000 on it now. 2019 Chevy Duramax HD 2500 ltz 6.6 turbodiesel. Performance and max trailering PKG double cab long bed black ..., Use scan tool to determine the cause of the issue most common-. Def or reductant fluid tank heater failure. NOX sensor 1 postion 1. Use can tool to determine issue, if no codes persist check live data with scan tool and look for jumps in ppm of nox sensors (nox sensors only start to read at a high temp so the engine might have to be in high ..., At least I would have filled some fluid into the tank before going to the dealer, just in case. I have a 2012 Duramax, and when my "service exhaust fluid" message came on, I actually had enough DEF in my tank. The dealer checked and it was due to a bad DEF heater. The DEF systems have been notorious for problems., 2010 (Vans with LHG only) and 2011 Diesel Exhaust Fluid (DEF) DIC Messages: Service Exhaust Fluid System (Tamper): This message displays when a DTC sets related to the DEF system that is interpreted as tampering with the system. A detailed warning strategy is explained in SI Document 2410875. Exhaust Fluid Quality Poor: This message displays ..., What causes DEF warning won't clear in 2011 gmc 3500 with 6. There is a calibration for the vehicle computer update .This will need to be done by a dealer. dealer may encounter a customer vehicle with a DEF (diesel exhaust fluid) low message, speed limiting message, or a DEF range not resetting after a refill. If the vehicle is known to be full ..., DPF/DEF Delete. Wanting to delete the DPF/DEF system on a 2012 Duramax LML. I only want to delete it to get rid of the need for DEF and all of the issues that come along with it. I don't want to roll coal or anything like that. Really would like to keep the CAT to get rid of the smell/noise that comes along with the delete., A contaminated diesel exhaust fluid (DEF) system can be cleared using a vinegar solution. Meanwhile, this is how to clear the service exhaust fluid system in your truck: Mix 1 part of vinegar with 3 parts of water. Then, pour the solution into the diesel exhaust fluid tank., The DEF range DIC message first displays at approximately 1 600 km (1,000 mi). This message appears again at approximately 500 km (300 mi) of remaining range before the exhaust fluid tank becomes empty. As the fluid level nears empty, these messages appear every time the vehicle is started. If the DEF low warnings are ignored …, Whenever that message pops up, It means that the DEF system is experiencing an issue. Could be the DEF pump, The DEF level sensor, The DEF injector, lines, etc. Since the check engine light is on, there will be a diagnostic trouble code set in the PCM's memory. To sort the issue out, you'll have to scan the car for errors., Environmental management systems (EMS) are crucial for organizations aiming to reduce their environmental impact and operate sustainably. Before embarking on the implementation of ..., 2012 6.6 DEF continuous problems. Hi all, I'm here for help. I have a 2012 GMC 2500 6.6 I have 115,000 miles on it and over the past 50,000 miles I've had to have the DEF injector replaced and the entire DEF tank replaced. Last night I got the "poor" DEF fluid quality message with speed restrictions in 99 miles., The good news is that you can reset the exhaust fluid system and clear the service DEF message in 7 simple steps with the help of a scan tool. In the dashboard, connect the scanner to the scan port