Service def veh speed limited to 5mph

Jul 04, 2024
Aug 15, 2012 · On Oct 30, 2012 I had the, "50 miles until speed limited to 50mph," message occur about 320 miles from home. I quickly looked up the nearest Ford dealer on GPS and drove directly to that dealer. I informed the service adviser that there was a TSB issued on the problem but they insisted that I must have low DEF..

Def tank full truck won't go faster than 55. Hey guys our lml with 101k on it needed def today so the warning popped up so I filled it up. But the speed is still limited to 55 and we need the truck for work tomorrow any help would be awesome thanks in advance. 2006 lbz dually, efi live by Idaho rob, ad2 165, pcv reroute, tie rod sleeves, cts ...8,346. Mar 19, 2021. #10. I just got this wonderful message on my way home im gonna try pulling the battery cables and discharging the capacitors ( touching the pos and neg together) we shall see i know about a weekago i got a CEL for DEF module unable to communicate but i cleared them and it didnt reappear.Maitland Institutional Services Limited (MISL) Form 8.3 - Maitland Institutional Services Limited: Appreciate Group Plc 08-Feb-2023 / 1... Maitland Institutional Services Lim...Suddenlink Internet Services is a leading provider of high-speed internet in various regions across the United States. With their wide range of speeds and packages, they cater to t...About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright ...I have a 2013 Volvo with a D13 dash says service Def vehicle sweated to 5 miles an hour. No fault codes. Changed def - Answered by a verified Technician2013 RAM 5500 Service DEF system see dealer. 200 miles until speed limited to 5mph. Jump to Latest Follow ... The DEF could very well be frozen into a solid chunk, depending on where in CO it sat. We had that happen on a '17 that sat, but that was for at least a month.SR System Fault Veh Speed Limited to 5 Mph. Submitted: 1 year ago. Category: Volvo. Show More. Show Less. Ask Your Own Volvo Question. Share this conversation. Answered in 12 hours by: 8/29/2022. ... Now it says Service DEF Veh Speed Limited to 5 MPH. Not cool on interstate ...Good morning sr, I have a 2016 mack 600 cxu, with a MP7, dash show me “service def, veh speed limit 5mph”, i have a 2020 snap-op pro-link edge, i scanned and show me 1 active code: DTC p103c, and 5 in … read moreOn my Dodge Cummins, a warning appears on the dashboard, stating, ‘5 MPH Max Speed in 49 mi Service DEF System See Dealer.’ This warning message indicates the issue with the Diesel Exhaust Fluid (DEF) system. Because of this, the vehicle has entered a reduced-speed or limp mode. The maximum speed is limited to 5 mph.MANUAL NOW - SPEED LIMITED TO 105 KM/H (65 MPH) – 120 KM (75 MI) UNTIL 89 KM/H (55 MPH) MAX SPEED displays. The displayed mileage will decrease as driving continues. A chime also comes on. After the transition to 89 km/h (55 mph) is complete, the DIC message SERVICE EMISSION SYSTEM - SEE OWNERS MANUAL …I have a 2017 Volvo 670,and its got 6 codes: sa 16 dtc p24570*****,p24da00,p011164,p040b64.what are these code? and showed "parked regen" then got "service DEF Veh Speed limited to 5 Mph". I did parked regen successfully,but still got 5 Mph limit.Which code probably cause that? Volvo D13Oct 8, 2020 · Welcom,have messaged “service DEF speed limited to 5mph.its Volvo 2013,d13,hope that you can help me. Volvo 2013,engine - Answered by a verified Techniciangearhead1011. 581 posts · Joined 2005. #4 · Jan 1, 2018 (Edited) I had my truck back to the dealer a total of 6 times over 3 years with an intermittent DEF system fault message and the 50 miles to speed limited warning. Most of the time the message would clear before I got to the dealer with it. Once it went to speed limited then idle only so ...On your issue the 5mph derate is linked with the scr system. This means that you have an active fault within the scr system for a component or an issue with the nox levels output. If unplugging the speed sensor does not increase the speed then the …After a few miles got the 5 MPH max speed in 125 miles service DEF system . At that point I was too far from my home dealer, and close to where we were going on a hunting trip, so hunting we went. Called a dealer from the hunting camp that was within the 110 miles that I had left on the countdown , and asked about the particulars, and what had ...While the average speed is dependent on the size of the track and pit area, most NASCAR races see drivers reach close to 200 MPH. Two of the most important factors that determine t...In today’s digital age, making payments online has become the norm for many individuals and businesses. With just a few clicks, you can pay your bills, shop for goods and services,...Welcom,have messaged “service DEF speed limited to 5mph.its Volvo 2013,d13,hope that you can help me ... I have a message on my dash that says Service DEF veh speed limited to 5mph ...Unfortunately once it reaches speed limited to 5mph, there is no manual/diy reset for this. It has stored fault codes now that the regular def fluid reset will no take care. At this point, the ONLY way to reset the system, including erasing the codes and resetting the lights and restoring power, is with a Mercedes STAR diagnostic scan tool .The def gauge says full. Company road service thinks I am stupid and put diesel in the def tank but at least is sending out a TA service truck to come see what is wrong with me. ... You could go a little faster than 5 mph if you take speed sensor off. Doealex, Jun 15, 2020. Doealex, Jun 15, 2020 #6. 88228822 Thanks this. Jun 15, 2020 …Ive got 2015 volvo vnl with a d13, on display it states def service required derate to 5MPH with no active codes in - Answered by a verified Volvo Mechanic. We use cookies to give you the best possible experience on our website. ... Now it says Service DEF Veh Speed Limited to 5 MPH.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.Aug 6, 2012 · If the vehicle speed has been limited and DEF has been added, it may take up to 30 seconds after engine start with the vehicle stopped for the EXHAUST FLUID EMPTY message to clear. If the vehicle is driven prior to the DIC message clearing, the vehicle speed will still be limited. If the DIC message clears while driving, the vehicle must be ...Welcom,have messaged “service DEF speed limited to 5mph.its Volvo 2013,d13,hope that you can help me ... 8,454 satisfied customers. I have a message on my dash that says Service DEF veh speed.5 MPH Max Speed Service DEF system see dealer. After navigating through all the ad hungry affiliate marketing schemes here on cummins forum, I finally made it through the laborious process of actually registering an account with the horrible image verification that sends you back to the screen and makes you reenter your username and password.739 posts · Joined 2013. #1 · Mar 19, 2015. When I got the 2014 truck new in Dec of '13, I ran the first tank of DEF way down just to make sure I knew & understood how far I could go by watching the "Low DEF" messages pop up, indicating how far I could go before my speed was limited to "5 mph". Coming back from Ohio with a (new box in …• Speed Limited To XX MPH Exhaust Fluid System Fault 1. While monitoring the REDUCT_TNK_LV PID, add up to 9.46 L (2.5 gallons) diesel exhaust fluid until the PID reads 100%. 2. With the vehicle in PARK or NEUTRAL increase the engine speed to 1000 RPM while monitoring the EGT11, EGT12, EGT13 and EGT14 PIDs. Run the engine until the exhaust gas ...Anytime a truck is stock for severe derate this simply means an program inner your truck it is limiting autochthonous truck to certain speed to elude damage toward your engine of emitted system. HIER ARE OBJECTS TO CHECK WHEN YOUR TRUCK ENTERS DERATE/5mph. * Doser stopcock * Nox sensor * Def fluid gauge * Inlet & Ausreise …Mar 12, 2021 · Just wonder if bad NOx sensor can cause this SCR derate to 5mph I have generic scanner and there are no codes whatsoever and display say's service def speed limited to 5mph / I do clear code (but there are none ) and it says then SCR performance Evaluation 5mphtemporary removed Customer attachment 3/12/2021 2:49:48 PM Few days back I ordered me ...Then without warning it stated speed limited to 50 mph. Upon further investigation, the wiring harness on the def pump had corroded connections, and a broken wire. We replaced the wiring harness. Ran codes and showing Pending Trouble Code of P204C, Permanent Trouble Codes of P208C, P20A2, P20A0, and P24A0. Attempted to run a regen with a code ...2017 Volvo d13. Changed def inj. Module dozer had. Filter cleaned only one temp sensor reads good others low temp. Fuel at only 9percent sets p249f00 and went into derate. Soot is at 11 percent can you please get me going in right direction to get it out of derate. Only have a snap on scanner to work with.In today’s fast-paced world, efficient and reliable shipping services are essential for businesses and individuals alike. One such service that has gained popularity is speed post,...how to regen a truck?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 d...Are you tired of slow internet speeds and limited options for cable TV providers? If so, you might be interested in exploring the services offered by Xfinity. Xfinity is a popular ...How To Fix Scr Performance Low Veh Limited To 5mph & ATS ... is stock to severe derate this simply means the program inside your truck computer is limiting your truck to certain speed to avoid damage to your engine of emission system. HERE ARE THINGS TO CHECK WHEN YOUR TRUCK ENTERS DERATE/5mph. * Doser valve * …The DIC displays the following messages: •Exhaust Fluid Quality Poor. •See Owner’s Manual Now. •Speed Limited to 89 km/h (55 mph) The messages alternate every 5 seconds until acknowledged by the driver; however, the Speed Limited to 89 km/h (55 mph), remains displayed on the DIC. The DEF Indicator in the instrument panel flashes ...If it is to the point of being in 5mph derate, the only way to get it out of derate is with a service tool. You can disconnect the speed sensor and this will help you drive for a limited time. The derate can be linked to any of the following, Biased nox sensors, DPF passing soot, Def doser bad, Poor def fluid, Improper regen temps, Engine ...Progressive warning messages will be illuminated on display. In the empty and ignored state, vehicle speed will be limited to 5 mph until DEF is detected in the tank. Using improper fluid will trigger a decrease in engine performance. DDC-SVC-GBK-0085 Specifications are subject to change without notice.The Société Nationale des Chemins de Fer Français (SNCF) is France’s national state-owned railway company. With an extensive network of high-speed trains, SNCF provides efficient a...On my Dodge Cummins, a warning appears on the dashboard, stating, ‘5 MPH Max Speed in 49 mi Service DEF System See Dealer.’ This warning message indicates the issue with the Diesel Exhaust Fluid (DEF) system. Because of this, the vehicle has entered a reduced-speed or limp mode. The maximum speed is limited to 5 mph.the DEF tank. • Low DEF levels will trigger a decrease in engine performance. DEF level is EMPTY and IGNORED Vehicle speed limited to 5 mph / engine derated Flashing DEF level is EMPTY Vehicle speed limited to 55 mph / engine derated DEF level is very low Solid DIESEL EXHAUST FLUID (DEF) INDICATOR LAMPS Low DEF warning light Light bar shows ...2013 Mack GU712 MP7 - VIN - ***************** - Replaced DEF Dosing Valve due to open circuit code with 5 mph derate. Code cleared and … read more. I have a 2014 Mack with an MP8 in it. Truck came in for a. Hello, I have a 2014 Mack with an MP8 in it. Truck came in for a Derate with Service DEF system on dash.319 posts · Joined 2016. #1 · Jun 25, 2020. While waiting in line to get into work today my DEF gauge went to empty and received a message (speed limited to 5mph in 200 mi, refill DEF). Last week I had about 3/4 full of DEF (have a pic to prove it) and today it went to empty with only 245 miles of just daily driving.2016 Volvo VNL670, D13 “Service DEF, speed limited to 5 mph” message ... I have a message on my dash that says Service DEF veh speed limited to 5mph ...Is your computer running slower than usual? Don’t worry, you’re not alone. Over time, computers can become sluggish due to various factors such as software issues, unnecessary file...Category: Ford. Satisfied Customers: 6,594. Experience: Expert Volvo Car Mechanic. Verified. you can’t do much without scanner to see what is going or any resets to def system require scanner. only way is keep driving do. not stop cyycle key off it will reduce your more as soon as it sees key off.Mar 5, 2024 · On my Dodge Cummins, a warning appears on the dashboard, stating, ‘5 MPH Max Speed in 49 mi Service DEF System See Dealer.’ This warning message indicates the issue with the Diesel Exhaust Fluid (DEF) system. Because of this, the vehicle has entered a reduced-speed or limp mode. The maximum speed is limited to 5 mph.Hello Everyone, I have a 2020 Sierra 2500 Duramax Denali, 27,000 miles. The DIC is showing the following two messages, (Service Emission's System, 175 mi Until 65 MPH Max Speed). The dealer picked it up and gave me a loaner vehicle. They called and said the DEF tank needs to be replaced, warranty will cover everything.P208A 200 miles until speed limited to 5mph. ... the 200 mile countdown started. The service def see dealer message was on when I initially cranked it but the countdown came later. Also, the def injector code didn't show until I removed the injector. Reinstalled injector and code is still present.. if I can say, ...2013 RAM 5500 Service DEF system see dealer. 200 miles until speed limited to 5mph 2880 Views 24 Replies 5 Participants Last post by Jimmy N. , Dec 26, 2020 Jump to Latest Rolltide21 Discussion starter · Dec 24, 2020Mar 19, 2021. #12. H3LZSN1P3R said: I just got this wonderful message on my way home im gonna try pulling the battery cables and discharging the capacitors ( touching the pos and neg together) we shall see i know about a weekago i got a CEL for DEF module unable to communicate but i cleared them and it didnt reappear.2019 Freightliner Cascadia 570,000 miles I have derate %25 and speed limited at 55 mph. Check engine light is ON, DEF light is blinking I got codes shown on picture. ... I have a message on my dash that says Service DEF veh speed. I have a message on my dash that says Service DEF veh speed limited to 5mph ...Dec 25, 2019 · how to fix or get rid of derated 5mph speed on Volvo vnl 670, 770 and other trucks like kenworth Freightliner, Westernstar. ACM fault, poor def quaility, or ...8,346. Mar 19, 2021. #10. I just got this wonderful message on my way home im gonna try pulling the battery cables and discharging the capacitors ( touching the pos and neg together) we shall see i know about a weekago i got a CEL for DEF module unable to communicate but i cleared them and it didnt reappear.Low-Empty DEF notifications. When I got the 2014 truck new in Dec of '13, I ran the first tank of DEF way down just to make sure I knew & understood how far I could go by watching the "Low DEF" messages pop up, indicating how far I could go before my speed was limited to "5 mph". Coming back from Ohio with a (new box in the back …If it is to the point of being in 5mph derate, the only way to get it out of derate is with a service tool. You can disconnect the speed sensor and this will help you drive for a limited time. The derate can be linked to any of the following, Biased nox sensors, DPF passing soot, Def doser bad, Poor def fluid, Improper regen temps, Engine ...Your P220013 fault code is for inlet nox sensor. This means the nox sensor is defective. This nox sensor is located at the base of the dpf housing. Once the sensor is changed there is a reset that will need to be performed with a service tool. Then a nox conversion test can be ran. This will verify that the sensor is reading and take the unit ...2013 RAM 5500 Service DEF system see dealer. 200 miles until speed limited to 5mph 2880 Views 24 Replies 5 Participants Last post by Jimmy N. , Dec 26, 2020 Jump to Latest Rolltide21 Discussion starter · Dec 24, 2020Welcom,have messaged “service DEF speed limited to 5mph.its Volvo 2013,d13,hope that you can help me. Volvo 2013,engine - Answered by a verified TechnicianFill your 5.3-gallon tank with diesel exhaust fuel, and the clear Duramax service DEF system message will go away. After filling the tank with DEF, start the truck and let it idle for 50 seconds. Drive the vehicle for 5 minutes at low speed, Service DEF system message will go away. Watch this video to learn how to add DEF to your Duramax.Feb 12, 2021 · SCR System Checks All steps below should be performed to verify proper function of each component. 1. Check DEF quality with a refractometer 2. Physically check for any contamination in the DEF tank • Examples - Dirt or Debris - Coolant - Water - Fuel - Oil 3.Unfortunately, the ONLY way to get the message to turn off is to fix the problem that is causing the issue with the DEF system. At this time, I HIGHLY recommend to get the vehicle in to the nearest dealer and have them diagnose the problem. With 33850 miles on it the DEF system issue WILL be covered under your warranty.Dec 26, 2020 · Current Ride. 2021 F350 6.7 Iconic Silver Platinum Tremor w/winch. Current Ride #2. 2020 Jaguar F Pace SVR - 2020 Harley Davidsnon Limited CVO. sillawydna said: "Def fault limit speed to 50 mph" popped up on the screen yesterday for about 10 seconds while driving then disappeared, as if it healed it's self. Truck has a total of 600 miles on it.Technician: Mike Mcmillan. Since the unit can not complete a regen it has reduced engine power and vehicle speed. When the parked regen was initiated it was probably seen at that point that the dpf can not make it to temp or the ahi module is defective. you can try to drive it that far, I just fear that you will crack the dpf since it can not ...2016 Volvo VNL670, D13 “Service DEF, speed limited to 5 mph” message ... I have a message on my dash that says Service DEF veh speed limited to 5mph ...The internet is pretty ubiquitous these days. Most people have it in their homes, and even many public places offer access to free Wi-Fi connections. But that doesn’t mean you can’...In light of growing concerns around COVID-19, Wheels has decided to pause its pedal-less e-bike operations until the end of March, the company announced today. “After weighing the ...Jan 5, 2017 · still derated and no lights information screen on dash says service def vehicle speed limited to 5 mph Technician: roybelding , Shop Foreman Freightliner trucks replied 7 years ago does not make any sense. if de rated, it should set a code.If it is to the point of being in 5mph derate, the only way to get it out of derate is with a service tool. You can disconnect the speed sensor and this will help you drive for a limited time. The derate can be linked to any of the following, Biased nox sensors, DPF passing soot, Def doser bad, Poor def fluid, Improper regen temps, Engine ...In today’s fast-paced world, efficient and reliable shipping services are essential for businesses and individuals alike. One such service that has gained popularity is speed post,...5mph max speed service def system. Jump to Latest Follow May's Cummins of the Month is now open for entries! 21 - 40 of 79 Posts. 1 2 of 4 Go to page. Go. 4. goingcamping2 · Registered. Joined Sep 14, 2017 · 292 Posts #21 · Apr 21, 2019 ... 2023 Ram Limited Mega Cab16 Feb 2021 ... Comments84 · Common DEF problem, how to clear SCR closed loop control at maximum limit fault code · "You must have a bad NOX sensor..." &mid...As of 2014, there are no states without a speed limit in the United States. In the U.S., each state is allowed to set its own speed limits and those limits vary from 10 to 85 miles...5 MPH Max Speed Service DEF system see dealer. After navigating through all the ad hungry affiliate marketing schemes here on cummins forum, I finally made it through the laborious process of actually registering an account with the horrible image verification that sends you back to the screen and makes you reenter your username and password.Service DEF see dealer message...5 MPH in 150 miles. Jump to Latest Follow. 133K views 53 replies 30 participants last post by Ltngdrvr Feb 15, 2018. johnsdeere Discussion starter. 124 posts · Joined …144. 11K views 4 years ago. how to fix or get rid of derated 5mph speed on Volvo vnl 670, 770 and other trucks like kenworth Freightliner, Westernstar. ACM fault, poor def quaility, or any...WARNING!!: ⚠️⚠️⚠️Always use the proper tools and safety equipment to perform this job. Failure to perform the job correctly can result in personal injury or ...Hello I have a 2015 Volvo with d13 Volvo engine on my dashboard say service def veh speed limited to 5 mph And I only have this active code p249f-00 Submitted: 8 months ago. Category: Medium and Heavy TrucksIf the speed limiter has defaulted to 4mph then unfortunately there is not a quick fix for this. It is going to need a few special tests performed on the reductant system, but these cannot be done without a full size scan tool. Ask Your Own GM Question. GM Tech (Cam), GMC Mechanic. 6,003 Satisfied Customers.

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That Welcom,have messaged “service DEF speed limited to 5mph.its Volvo 2013,d13,hope that you can help me ... I have a message on my dash that says Service DEF veh speed.In today’s fast-paced world, efficient and reliable shipping services are essential for businesses and individuals alike. One such service that has gained popularity is speed post,...Service DEF system 5mph in 200 miles see dealer warning on my 2015 2500 6.7 Cummings with 20500 miles on it. -800 miles round trip for business -Abnormally cold conditions for the south around 10degre …

How Just wonder if bad NOx sensor can cause this SCR derate to 5mph I have generic scanner and there are no codes whatsoever and display say's service def speed limited to 5mph / I do clear code (but there are none ) and it says then SCR performance Evaluation 5mphtemporary removed Customer attachment 3/12/2021 2:49:48 PM Few days back I ordered me ...I have Service DEF, vehicle 5 ml per hour issue, got it from Volvo dealer a week ago and it is the same thing, they cannot fix it, any idea? Click to expand... If they can't fix it, call Volvo and get their regional people on it, the mechanic is not doing his job.Driving home on a trip and got 5 MPH Max Speed in 148mi Service DEF System See Dealer message. 2018 Ram 3500 with 46987 miles. No check engine lights are on. read more2016 Volvo VNL670, D13 “Service DEF, speed limited to 5 mph” message ... I have a message on my dash that says Service DEF veh speed limited to 5mph ...89 km/h (55 mph) Max Speed on Restart. The messages alternate every 5 seconds until acknowledged by the driver; however, the Speed Limited to 89 km/h (55 mph), remains displayed on the DIC. The DEF Indicator in the instrument panel flashes continuously. Vehicle speed is limited to 89 km/h (55 mph). Warning Level 4.

When The Rules of Attraction - Speed dating events are typically held in bars or restaurants, however they have recently spread to college campuses. Find out how speed dating events wor...I got Freightliner cascadia 2021 here in my shop with dpf inducement derate 5 mph with codes of high carbon doser - Answered by a verified Technician. By chatting and providing personal info, ... I have a message on my dash that …The vehicle may be limited to a maximum speed of 5 mph (8 km/H) if the DEF system is not serviced within less than 200 miles (322 km) of the fault being detected. When the DEF system needs to be serviced the following warnings will display: ... 5 MPH Max Speed Service DEF System See Dealer — This message will continuously display, and will be ...…

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pill i g 283 Fill your 5.3-gallon tank with diesel exhaust fuel, and the clear Duramax service DEF system message will go away. After filling the tank with DEF, start the truck and let it idle for 50 seconds. Drive the vehicle for 5 minutes at low speed, Service DEF system message will go away. Watch this video to learn how to add DEF to your Duramax.On your issue the 5mph derate is linked with the scr system. This means that you have an active fault within the scr system for a component or an issue with the nox levels output. If unplugging the speed sensor does not increase the speed then the parameter for max engine speed without vss must be at its lowest point. ethridge tennessee amish maphot shot coffee net worth MANUAL NOW - SPEED LIMITED TO 105 KM/H (65 MPH) – 120 KM (75 MI) UNTIL 89 KM/H (55 MPH) MAX SPEED displays. The displayed mileage will decrease as driving continues. A chime also comes on. After the transition to 89 km/h (55 mph) is complete, the DIC message SERVICE EMISSION SYSTEM - SEE OWNERS MANUAL …None 8km/h (5mph) Road Speed Limit (RSL) Note: Vehicle has to be stationary before 8 km/h (5 mph) RSL becomes active. Exit conditions for DEF Quality “8 km/h (5 mph) Road Speed Limit” (RSL) Inducement First Restart: Return to 25% torque reduction until proper DEF quality evaluation. If poor DEF quality is detected during the morehead city north carolina craigslistvuse alto couponcarrabba's monthly wine dinner The ''5mph Max, Service DEF System'' message appears when your Diesel Exhaust Fluid runs low. DEF is essential for filtering the toxic nitrogen oxides from exhaust fumes. When the fluid runs low, your track activates a safety measure that lowers your maximum speed. This can be a nuisance if it happens on a highway.I got Freightliner cascadia 2021 here in my shop with dpf inducement derate 5 mph with codes of high carbon doser - Answered by a verified Technician. By chatting and providing personal info, ... I have a message on my dash that … piggly wiggly weekly ad westwego Service DEF System If a problem occurs with the DEF system, a DIC message displays along with distance until vehicle speed is limited. The speed limitation will occur in a series of steps with the final speed limitation being 8 km/h (5 mph) along with a flashing warning light and chimes. los charros east moline menuvintage pottery marked usachapel oaks funeral home holton obituaries On my Dodge Cummins, a warning appears on the dashboard, stating, ‘5 MPH Max Speed in 49 mi Service DEF System See Dealer.’ This warning message indicates the issue with the Diesel Exhaust Fluid (DEF) system. Because of this, the vehicle has entered a reduced-speed or limp mode. The maximum speed is limited to 5 mph.May 1, 2023 · The ''5mph Max, Service DEF System'' message appears when your Diesel Exhaust Fluid runs low. DEF is essential for filtering the toxic nitrogen oxides from exhaust fumes. When the fluid runs low, your track activates a safety measure that lowers your maximum speed. This can be a nuisance if it happens on a highway.