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07-27-2021, 01:15 PM
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#1
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Junior Member
Brand: Still Looking
State: Michigan
Posts: 14
THOR #17911
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DEF Question
2018 Thor Synergy MB Sprinter 24ft Diesel
Ran low on def, not out...
Warning chime came on about every 10 seconds. Got stopped and added fluid.
No engine issues, ran fine.
Problem now is that the chime comes on at different times. Once in a half hour or every five minutes. Refilled again with no change in chiming.
Any suggestions, other than taking it into MB for service charge?
Thought I would disconnect chassis battery to see if computer would reset?
Thanks
Larry
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07-27-2021, 01:20 PM
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#2
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Senior Member
Brand: Thor Motor Coach
State: Missouri
Posts: 2,327
THOR #6903
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Quote:
Originally Posted by Professor
2018 Thor Synergy MB Sprinter 24ft Diesel
Ran low on def, not out...
Warning chime came on about every 10 seconds. Got stopped and added fluid.
No engine issues, ran fine.
Problem now is that the chime comes on at different times. Once in a half hour or every five minutes. Refilled again with no change in chiming.
Any suggestions, other than taking it into MB for service charge?
Thought I would disconnect chassis battery to see if computer would reset?
Thanks
Larry
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Usually several restarts with no indication of low DEF will reset the alarm
Some have tried to power down with mixed success
Seems to be different per the various software packages on the different ECM's
I had one warning after parking on a very sloped parking lot with about 1/3 tank. It did reset on about the 4th start
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07-28-2021, 12:26 PM
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#3
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Junior Member
Brand: Still Looking
State: Michigan
Posts: 14
THOR #17911
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Quote:
Originally Posted by lwmcguire
Usually several restarts with no indication of low DEF will reset the alarm
Some have tried to power down with mixed success
Seems to be different per the various software packages on the different ECM's
I had one warning after parking on a very sloped parking lot with about 1/3 tank. It did reset on about the 4th start
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Thank you....will wait awhile and try disconnecting.
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07-28-2021, 12:44 PM
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#4
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Senior Member
Brand: Thor Motor Coach
Model: Omni XG32 GONE for good
State: Alabama
Posts: 1,750
THOR #22586
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The DEF system is fragile and sensitive and not similar to other systems, like fuel, where you add it and the gauges record that right away. Be an observant driver and don't let it get low or empty. When we went to AK the advice for fuel is operate off the top half of the tank. Do the same with DEF. That's not going to have any effect on other DEF problems like failed DEF heads, mis-fueling, etc. but it will help keep you out of some trouble.
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2022 Renegade Valencia 35MB
2021 Jeep Gladiator
2019 Harley Davidson FLHTC
2012 PT Crusader 355BHQ
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07-28-2021, 12:52 PM
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#5
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Senior Member
Brand: Thor Motor Coach
Model: Miramar 37.1
State: California
Posts: 2,494
THOR #12698
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Just a side note, on my recent 5,000 mile trip, I went through 5 gallons of DEF. On my Sprinter, I can check the DEF level from inside by scrolling through the dash functions to get to the DEF level function. After about every 2,000 miles I add 2 1/2 gallons of DEF to the tank.
Paul
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07-28-2021, 07:29 PM
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#6
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Senior Member
Brand: Thor Motor Coach
Model: THOR Chateua 35SF
State: Florida
Posts: 5,850
THOR #11130
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The F550 chassis requires you turn key off in order for the gauge to reset and the system recognize the tank has been filled. I ran low, added fluid...still got warnings even after shutting off key for a bit. The next morning it showed the tank full when leaving camp. Those systems have a mind of their own. Just keep it near full going forward.
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Now an SOB
Traded Thor for Melbourne Prestige 24NP
2018 THOR Chateau 35SF
Two Labs, Bugsie & Blondie
Blondie passed in 2020 at 5 to Leukemia
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07-30-2021, 01:39 PM
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#7
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Senior Member
Brand: Thor Motor Coach
Model: Omni XG32 GONE for good
State: Alabama
Posts: 1,750
THOR #22586
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Quote:
Originally Posted by The Gritz Carlton
The F550 chassis requires you turn key off in order for the gauge to reset and the system recognize the tank has been filled. I ran low, added fluid...still got warnings even after shutting off key for a bit. The next morning it showed the tank full when leaving camp. Those systems have a mind of their own. Just keep it near full going forward.
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I was at 1/3? tank yesterday and put in a 2 1/2g refill. First on the Omni the filler location is under a slide up high so I had to run the slide in before we left just to have room. Getting the DEF in was slow and it burped out a few times splattering me some on the leg. I did finally manage to coax the jug in but it's a pain due to filler location and I suspect the routing of the filler tube to the onboard tank. I haven't tried filling at a bulk filler at a fuel station yet but hopefully that would be better. I didn't think about the DEF gauge till a couple hours later and it showed the additional DEF in the tank. I was shutdown when adding.
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2022 Renegade Valencia 35MB
2021 Jeep Gladiator
2019 Harley Davidson FLHTC
2012 PT Crusader 355BHQ
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07-30-2021, 02:39 PM
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#9
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Senior Member
Brand: Thor Motor Coach
Model: Omni XG32 GONE for good
State: Alabama
Posts: 1,750
THOR #22586
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Quote:
Originally Posted by cupajoe147
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Without examine the actual spout, how does that differ from what's attached to each jug you get at Walmart? From the picture on the ad it looks the same. Problem I had was trying to get the stuff to flow out of the jug into the truck filler without it backing up and burping out. That and just getting it to flow at all. I'm all for not having a DEF foot treatment.
__________________
2022 Renegade Valencia 35MB
2021 Jeep Gladiator
2019 Harley Davidson FLHTC
2012 PT Crusader 355BHQ
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08-04-2021, 08:43 PM
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#10
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Junior Member
Brand: Thor Motor Coach
Model: Palazzo 33.2
State: Alberta
Posts: 16
THOR #3333
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def filler
Quote:
Originally Posted by chunker21
Without examine the actual spout, how does that differ from what's attached to each jug you get at Walmart? From the picture on the ad it looks the same. Problem I had was trying to get the stuff to flow out of the jug into the truck filler without it backing up and burping out. That and just getting it to flow at all. I'm all for not having a DEF foot treatment.
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I bought a little battery operated pump $15. and use it exclusively for def. Leave the jug on the ground and pump till it's full.
works great.
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08-05-2021, 02:43 AM
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#11
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Junior Member
Brand: Thor Motor Coach
Model: Sierra
State: Texas
Posts: 13
THOR #5022
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Quote:
Originally Posted by Professor
2018 Thor Synergy MB Sprinter 24ft Diesel
Ran low on def, not out...
Warning chime came on about every 10 seconds. Got stopped and added fluid.
No engine issues, ran fine.
Problem now is that the chime comes on at different times. Once in a half hour or every five minutes. Refilled again with no change in chiming.
Any suggestions, other than taking it into MB for service charge?
Thought I would disconnect chassis battery to see if computer would reset?
Thanks
Larry
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Forgive me for joining in this thread with my own similar problem on my 2014 Sprinter Mercedes. I had a msg that said service A was x days past due. Thinking it had to do with def, I topped off the tank with about 2 gals. A couple days later a msg came on about def. Now I can't clear either msg even though all fluids levels are ok and I had recently changed oil & filter. Stopped at a Mercedes dealer today to get a technician to reset the computer but they tell me they have to run a diagnostic test and won't be able to do it for about 10 days. Surely, it can be reset without their test gear hooked up. No? I tried to use the instructions on You Tube without success. Not sure what I'm doing wrong but can't believe it has to be hooked up to a diagnostic system to reset these 2 msgs. I want to take a trip this wk but don't want to go if I get stranded because the computer won't reset. Need advice please.
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08-05-2021, 03:23 AM
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#12
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Senior Member
Brand: Thor Motor Coach
Model: Miramar 37.1
State: California
Posts: 2,494
THOR #12698
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I haven't had the DEF message, but have had the past due on service message. I was still able to drive it with no issues even though the past due kept reappearing. When I talked to a MB service writer, he told me that the service message comes on after the time period has been reached no matter if the mileage still has a ways to go before an actual service is due. Usually the DEF message comes on if you let the DEF go to almost empty. I always refill just after I get to the half way mark. At halfway, I need to refill with 2 1/2 gallons of DEF to fill the tank back to full. It holds 5 gallons of DEF in the Sprinter.
Paul
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08-05-2021, 11:53 PM
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#13
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Senior Member
Brand: Thor Motor Coach
Model: Four Winds
State: California
Posts: 406
THOR #24260
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On some vehicles, my dodge in particular, the def gauge is like a sonar, it looks through the fluid to the top, does a math thing and determines the amount of def in the tank. I found when the tank got low, filler her all the way up. After about three engine cycles, the gauges read properly again.
Just a thought.
Terry
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Terry and Geri
2017 Four Winds 35SD
2020 Grand Cherokee Toad
Semper Fi
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09-16-2021, 02:03 PM
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#14
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Junior Member
Brand: Thor Motor Coach
Model: MAGNITUDE XG32
State: Arizona
Posts: 1
THOR #24857
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I have the magnitude 2020 with the 550 chassis and the def is on the left. My d e f was hard to fill, until I found out that if you Pullin to a rest stop for example make sure your DEF fill side is on the high side of your rig so your rig leans a little bit to the right. With a funnel filled just fine in 2 minutes . If your rig is level the def is hard to fill, took me over 45 minutes for just 2.5 gallons as it burped back out all the time.
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10-07-2021, 02:08 PM
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#15
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Senior Member
Brand: Thor Motor Coach
Model: Tuscany 40ex
State: Ohio
Posts: 455
THOR #12726
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If you look at the flexible tube on the def jugs the little black rubber built into the cap is supposed to vent the jig as it empties but what they don’t tell you is that vent should be at the top when pouring to break the vacuum, what I do is after starting to pour I use my pocket knife and puncture a small hole in the jug and it will flow out 3 times faster
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