Your DEF Gauge is Lying - RAM Cummins 2500

RAM DEF gauge shows more fluid than is actually in the tank.

[@AES5967]

Marion Blair: Leading RAM-truck design investigator and researcher. Thank you again

[@davidh6809]

I have a 2017 dually which shows DEF level gauges the same way as noted in your video, had it for 44,000 miles. Recently I took the DEF down to where the needle was almost on zero then added 2.5 gallons, this located the gauge between 1/2 and 3/4 then I drove 1000 miles. End of that run put the needle in the red. I'm pulling 17,600 pounds. Don't know if everyone knows this but DEF at the pump is under $3.00 a gallon, on my last trip to NC I noticed a Circle K had a DEF pump. I usually buy DEF at truck stops and was glad to see this.Thanks Marion for your excellent videos, very much appreciated.

[@benc.7446]

Def gauge works off of sonar. The sensor itself is about halfway up the DEF tank so it will not move from full until it gets down to about 1/2 a tank. Best way to think about the level is as soon as it starts to come off full you have about a 1/2 a tank at that point the gauge is relatively close to telling you how mush is left of the 1/2 a tank. I originally thought my truck was using DEF too fast until I found out how the gauge worked. There are some videos out there explaining the was the gauge works. I believe Motor City Mechanic did one with a cutaway of the tank.

[@ramecodiesel8271]

Good explanation of how the gauge works.

[@aharleyguy]

So my gauge is stuck on 1/4 level, just above the red zone. I have a full tank of DEF. How do you fix the gauge?

[@benc.7446]

@@aharleyguy unfortunately there is not one easy fix. If it is full and the needle did not move it is likely m issue with the sensor itself in the tank. Not sure if you have seen or heard of the Alpha OBD app but if you have an android device or a laptop PC you can purchase the app and it gives you a ton of ability to diagnose and even upgrade your truck. It is very close to what the dealership has to work on your truck. One of the sections on the app is specifically on the DEF system. That may get you what you need to diagnose and possibly repair on your own but ultimately it sounds like you may need to replace a part.

[@TheClubbinator]

I find when I put my foot into the pedal and spin up the turbo that I actually start seeing the DEF fuel gauge start to go down a little. I haven't towed anything with it at this point. So I believe its the same principal as towing with a load to a bit. Ty again Marion for sharing and keeping us educated on these trucks.

[@robertalynch5433]

Oh thank goodness. You just made my day. I topped mine off and I have driven 2000 miles and no movement on the gauge. I was really worried. Thanks!

[@0rickkathy0]

Thank Marion, love your videos. I have a 2018, and these help me greatly. I believe you are correct about this issue.

[@sumnerkinney2166]

This is great info for me! I could not find in my manuals (2014 Ram 2500) ANYWHERE that said the capacity of the DEF tank. It is probably there it is just that I am not nearly as ocd as you Marion. Your the best!

[@IndianaFr0g]

Dang, thats kind of scary. Imagine trekking across the country expecting to fill up with DEF at the next LOVES only to find out your ran out 50 miles from the nearest exit, at 3:00am. I carry 2.5 gallons with me, just in case, but now I'll need to keep a closer eye on that.

[@0rickkathy0]

Best advice. Almost happened to me on the way back from Vegas last year.

[@odertube]

With my Ram, I found that I hardly use any DEF at all until I'm towing. I can go 6+ months without having to add any DEF during the winter when I'm not towing. During the summer, I'll add a gallon when it hits 50% empty and it barely hits 100% full. Not really a problem.

[@irwfcm]

It would have been interesting for you to add one gallon at a time back to the tank and show where the gauge was after each addition until it was full. That would have given you the information you wanted to know about how your gauge represented what was actually in the tank.

[@jc525exc]

Many folks on other forums say the tank holds 7.5 gallons. Now I understand how they are coming up with this number. Thanks for video.

[@GardnerOutdoors]

The mysterious DEF gauge ! I enjoy your videos, Thanks!

[@MarionBlair]

Thanks for watching!

[@bucky1996]

Interesting stuff! Thanks for sharing.

[@paulpeterson8288]

Marion, I thought the same with mine. Found this video helpful. Tech talk #7: Ram Diesel DEF fluid gauge stuck on Full KZbin · 52,000+ views · 9/10/2016 · by MotorCity Mechanic

[@mark53susan56]

Proud owner of a 2015 Ram 2500 Cummins. I use to wait until the def gauge dropped to about a 1/4 or less. After 20k miles I got the infamous “service def soon ... 150 miles to limp mode” .. CRAP.! My dealer discovered the def pump was damaged and replacement was necessary. The tech, who I have a great relationship with told me to try to keep the def tank as full as possible because when the level gets lower the urea salts will come out of solution when air is in the empty tank area .. freeboard area. Damn sure makes sense! Anyway, we are fortunate in our area to be able to get def at a pump. I’m with Marion, don’t rely on the gauge. Keep that tank full and save that pump!

[@MarionBlair]

thats an excellent point

[@cwilks5592]

Great info. mark, I recently purchased a 2015. I have put 1300 miles on it and was starting to wonder if the gauge was going to move. Haven't towed yet. I was going to keep it on the low side because I'm freaked out that the fluid will go bad but now after seeing your post I'll keep it topped off.

[@scottfletcher199]

Thank You for sharing this! I Love ALL of your work! Real Value!

[@MarionBlair]

I appreciate that!

[@jinwushih]

Yea, I came to that exact conclusion when I filled up the DEF tank at a fueling station pump. I was surprised how much it took and how long it took for the guage to start registering usage. Later on I found out that you do not want to use DEF pumps at stations and top it off to 5 gallons during the Texas summer because the DEF fluid becomes less effective when it sits in the heat. So during the summer time I ONLY put in 2 1/2 gallons a time using the boxes of DEF at Wally World.

[@mattmorrow3656]

I would encourage everyone to read Doug Leno's article in TDR (turbo diesel register) issue 108 pages 25-27 regarding def. It really helps understand some important things about keeping your def healthy. I believe keeping your tank brim full will cause problems in the long run if you do not drive enough miles to burn through it.

[@sam3d]

I was told at the dealer never to fill the def to the max, because it expands with heat.

[@MarionBlair]

Yea, I usually wait till 1/2 to 5/8 of on the gauge then add 2 1/2 gallons

[@jko0526]

I was told the same thing by my dealership.

[@RangerCel]

Thanks for taking the time to post this. Mine was showing full and I am mediately went to fill it across the street from the location I was at when I watched your video (waiting forever at the DMV) and my 2500 took 1.53 gallons of DEF. Not good Ram, pas bon!

[@MarionBlair]

Ha, I'd rather go to the dentist than the DMV.

[@grandlakephil]

Same happened to me on vacation. Filled up at a truck stop then after 4K the gage moved. Thought something was wrong and I was going to run out. Now at 1/2 I add a 2.5 gallon box

[@Charlyalphatang0]

mine was topped off as well "2018 Ram 2500 Cummins" and it took almost 5000 miles before it budged

[@HaydenWimmer]

Love your content

[@Inline6Guy]

The gauge will not start dropping until the fluid level drops below the sending unit, which is actually about half tank. That’s why the tank reads full for so long, It’s normal. Just how the DEF sending unit system works with no float

[@desertdog2282]

I was hoping you would have shown us what the gage would read after adding one gallon back into the tank at a time. Maybe next time. Thanks for the video.

[@MarionBlair]

Next time

[@billkoch9256]

When I researched it, I had just bought my truck, I read that the tank can hold up to 7 gallons of DEF. it’s not recommended to overfill because of expansion in heat and cold.

[@nickmnusa84]

Mine does this too. Filled it to full about 3,000 miles ago it is just coming off full now. I also have a fleet of 3 2014 3500's that do the same. I but DEF by the 55 gallon drum for those vehicles.

[@rvdogfl]

My Ram DEF gauge is working just like yours. The gauge will say full until the DEF tank is half full then then the gauge will start moving. Once the gauge starts moving it will move 1/4 tank of DEF to one tank of diesel fuel. Your gauge is working fine it is just how Ram made them.

[@mickfisher2351]

Ditto.

[@firehawk6188]

And my prior 2018 Cruze was the same way. These vehicles consume so little DEF it's silly to run them down. Get to know your rig, you'll know how many tanks of fuel vs a tank of def after a while and just plan on it.

[@MarionBlair]

I'm not that organized, ha

[@brenteason9891]

Yup, mine says "full" constantly too. The delete and tune took care of that problem for good. When I did need DEF, gauge seemed to work okay, but don't miss dealing with that stuff.

[@davidbooth5851]

My owners manual... 2017 ... Said you can still add 2.5 gallons after gauge shows full total of 7.5 gallons ...so yes it will show full til it's actually at 2)3rds

[@johnheinz5072]

Excellent video. Make sure you keep the fluid below the unit the system will start to dose and eventually will not read it moving then it will put it in derate due to being over full. Finding this out with different scr systems

[@MarionBlair]

thanks, didn't know that.

[@hardtruth2039]

My 2018 def gauge stays on full all the time, never burns an ounce of def, and the truck runs wonderfully.

[@drewjames8594]

Cant wait until mine hits 100,000 so it will do the same!... Did you wait until warranty was out? How has it worked out for you?

[@MarionBlair]

I'm working on that, ha.

[@yohnny8839]

You’re right. Mine has been showing full for the past year. ;)

[@firehawk6188]

Yeah, mine never moves from full!

[@R.E.L.Asphalt_Sealcoating]

I think its for expansion when it freezes.

[@monsterram6617]

Mine lies too. It reads "full" despite the fact that I removed the DEF tank years ago!

[@swampratt36]

DEF delete ✔️

[@greglynn4018]

Lol! Yep, mine too :-)

[@herculesinwyoming]

Yep mine “ fell off” too.

[@herculesinwyoming]

Evil Mofo I think it’s a design flaw or something like that.

[@russellbroome8796]

Corrugated roads in Australia. Terrible. My whole DPF DEF everything fell off. Runs better now, so didn’t put them back on.

[@kvistads]

Great video once again Marion! I needed this one. I poured in 2.5 gallons of DEF when it was somewhere between one-half and one-quarter of a tank on the gauge. The needle went all the way to full and hasn't come off since. Not sure of the miles, but I've filled the tank full of diesel at least 4 times since (topping it off a few times) and I'm thinking this gauge is stuck. I don't use the truck very much unless towing the RV or like last weekend when we took it on a lengthy trip to the mountains - about 265 miles one way and that's not counting the running around mileage. I'm thinking of draining the DEF like you did just to find out if this gauge is stuck. Man does this thing P_ss me off! As always, thanks! Russell

[@kayla33383]

DEF gauge saying it empty when it's full. Yesterday had to jump start it. This never happened before... This morning didn't start again. When it was on, it said 190 miles until dropping down to 5 mph. There is no check engine light on. Just the warning light. What is going on?

[@rickywilson6214]

Your filling it to full

[@MarionBlair]

I normally wait till he gets half full, then put two and a half gallon

[@88ranchok]

I read on the ram website you can go 2000 miles before it moves off of Full

[@kayla33383]

It's a 2018 Ram 2500

[@robertcornett5675]

my manual says the tank has extra room for freezing and not to fill completely up.

[@hunterprowsemrereviews9141]

I have a 2019 5th Gen Ram Cummins and I just use the truck stop DEF pump it’s a little bit more convenient than the jugs but mine I just lock the handle until it fills up and kicks off like a fuel pump normally does and mine will creep back up to 100% and stay there for a little bit but not long towing it uses it faster but I always put more in when I get to the 2/8th mark or 1/4 tank mark and I’ve never had any issues running out I never let it go in the red which is the under quarter section of the gauge but it won’t matter long soon my guard will say full and stay they’re infinitely as I’m planning on deleting the emissions entirely off it to prolong the engine life and avoid emission control equipment failures and costly repairs because we all know it’ll wait til the warranty runs out before going caput anyhow and they avoid warranty work that way so open the exhaust up let it breathe and run as it’s intended and enjoy the power boost and fuel efficiency boost and long healthy reliable engine life

[@UncleKarlito]

They might have updated it for 2019+. My 2019 DEF gauge seems to be pretty accurate and will move down as I would expect. Definitely very thirsty while towing!

[@benbarker8145]

Yes my def seems to go down alot more on my 19 vs my 17 i had

[@alfonzooliviera1121]

1) Love the videos 2) If a little spilled out wasn’t totally full. To totally fill you have to pour very slowly until you see def just sitting right at the top of the filler tube. Any other way it just choked on its way down and some spilled out. 3) Can you make a video on how far you can go on E maybe based on just using your probe and fuse 70 to drain whatever you can at E? I’ve heard in the tank there is basically a bucket of 2-3 gallons the fuel gauge cant read that keeps the fuel lift pump from sucking air and overheating so should be almost impossible to run too low...only out of fuel

[@1hasbeen531]

Run it until the light comes on and you still get a 200 mile warning. No need to sweat it. My '19 uses a lot more DEF than yours does. Closer to 500 MPG when pulling. I only top off on long trips and from the pump. First click and done.

[@ernestfeltman5472]

The dealer told me mine wound not move for 2-3 thousand miles.

[@REWYRED]

That weird hump or space in the tank might be room for expansion if the DEF freezes.. I will have to look at my manual but I think it cautioned against overfilling it in the event of the DEF freezing it could damage the tank.

[@MarionBlair]

It has a heater but I guess it could fail.

[@steveng4044]

Heater only operates when truck is on

[@TermiteBenny]

Correct, the fluid will freeze when the truck is not running. The expansion would break the tank if it did not have extra room. Every DEF required diesel I own will pump the fluid back into the tank after you shut them off. If that fluid stays in the lines going to the SCR then it would also freeze. It is not recommended to fill the fill hose all the way up for this exact reason.

[@YourDadsBoyfriend]

Simple solution. - delete

[@TermiteBenny]

Joe j That’s getting harder to do now a days. The computer programming is becoming the challenge to find someone to do.

[@r3d1911]

you should publish these videos as asmr videos. they would very much work to put me to sleep and that's a good thing. asmr combined with working on a truck.

[@MarionBlair]

That's a good idea!

[@r3d1911]

@@MarionBlair your videos are very very slow and very honestly relaxing at the same time never thought i could fall asleep watching a how to or car/truck video. i love your videos btw enjoy seeing when you post a new one. love to hear more from you.

[@jameskelson1891]

There is nothing wrong with your gauge except for the way it was designed. For reasons only known to Ram the gauge sender mechanism only covers the bottom half of the tank. That does mean it takes 3000 or so miles for a full tank to drop to the point where the gauge starts to read below 100%. It also means that when the tank reads under 50%, there is actually only a gallon or so of DEF remaining!

[@samdog1232000]

Purchased a 2021 new from dealer. I’m at 2394 miles and it just hit the red mark on def gauge. Maybe the dealer did not have it topped off. Showed full when I took it off the lot.???

[@MarionBlair]

i would fill it and keep it full.

[@normaaz5117]

Si el indicador marca vacio y el tanque esta lleno de Def se apagara el carro dodge ram 1500?

[@MarionBlair]

No se apaga pero puede entrar en modo flácido. Recibirá una advertencia antes de que eso suceda. Si el sensor del tanque está defectuoso, probablemente entrará en modo flácido. Si el sensor del tanque le dice al PCM que está lleno, no entrará en modo flácido incluso si el indicador dice cero.

[@normaaz5117]

Muchas gracias señor

[@richardnalbandian9572]

Is using bio diesel bad for my Cummins diesel truck?

[@kennethjones8621]

I always waited till mine gets to 1/4 then I put two jugs in, iv got 104,000 and never had problems out of mine. 🤞. Thinking of deleting soon🤫.

[@walterk1221]

My additional $0.02... I am the happy owner of a 2019 in which the behavior of the DEF gage is closer to "as expected". When my gage reads a needle-width less than half a 2.5 gallon jug of SuperTech DEF brings it right to 100%.

[@MarionBlair]

Looks like they fixed it, nice.

[@walterk1221]

@@MarionBlair possibly due to complaints such as yours. Have you gotten any word from FCA regarding the fix for the steering recall? The '19 trucks have entirely different steering linkage.

[@davidkeppler37]

Accord to my 3500 manual,.the tank is designed to reach full.on the gauge before the actual volume of the tank is full. It prevents over filling. The manual also.says that under normal.conditions your deisel.should use a tank of def.for about.every 7500 miles... If you fill it to the absolute top, you will never get an accurate reading.

[@MarionBlair]

Thanks for the info

[@ridingwithrick2760]

I know you are only stating what your manual says, but I personally don't look at the gauge when adding DEF or fuel, I'm always at the fill port and not inside my vehicle with the key on. This entire system seems flawed to me. Urea is quite corrosive, and it seems like nonsense to add concentrated synthetic piss to my exhaust. Now I have to create trash with all of the 2.5 gallon jugs I am forced to buy since there are so few DEF filling stations. When I look at the big picture, I wonder what puts more contaminates into the environment; burning diesel without DEF or making the 2.5 gal plastic DEF containers and littering our lands and oceans with more plastic? My guess is that in the long run DEF is worse for our environment because of the all the litter. It would be interesting to see an EPA report on the containers.

[@harveyroad6]

Sounds like my old Ford gas gauges. My 88 and 97 trucks both would show full for the longest time, sometimes over 200 miles then drop to 3/8 of a tank. Full on the gauge meant 3/4. Crazy we pay all this money. Toyota's have a better guage on their windshield wiper fluid than my Ford gas tank...

[@Bobm-kz5gp]

Thanks Marion, my 2018 gauge has been half full for a long time, better get 2.5 gal of def and put in it. I suppose you’ll get a warning before she goes into limp mode?

[@carlsommer4186]

Watch were you buy your DEF. Bulk tank at Truck stop will be the fresh stuff, simply bc the big trucks are using a lot of it. Buying a 2.5 gal jug at Johnny-Bobs car parts is not a good idea. That stuff may have been sitting around for a couple of years. And yes that hump in the tank is to allow for freezing ( expansion ) in cold temps. DEF turns to slush at 11 degrees ( above 0 ). Your engine then heats it back to liquid during the first hour of operation when the system is not dosing. It never freezes solid.

[@fjb4932]

Let it sit for a week at -10 deg's fahrenheit and i reckon she'll be froze solid ...

[@jko0526]

When I do have to buy the 2.5 gal jug I make sure to check the date on the box and buy it from a large city well known chain. Hoping that they go through it fast enough to rotate stock on the shelves. But I usually get mine from the truck stop. I read a lot of back and forth from guys on the forums about this subject but even the service manager at the dealership recommended getting DEF from the pump.

[@walterk1221]

I am told (I have not verified) the DEF gage does not use a floating sensor for indicating level. I am told it uses an ultrasonic level detection. At least Ram provides a gage; ford (apparently) does not.

[@TCB031]

Yes, I believe it was Motor City Mechanic who took one of these apart, and it is NOT a float type sensor.

[@walterk1221]

@@TCB031 I believe you are correct. I find MCM very helpful.

[@goat3898]

You are correct. I have to explain this to a lot of customers. Also depends on driving style load. If you’re doing a lot of highway driving it will use less as city driving due to different drive cycles. There has been a few updates for this issue so make sure you have the latest software in your ecu.

[@walterk1221]

@@chuckbock9875 the non-mechanical level sense goes back to 2014 and there is a TSB for 2014 Ram 2500 & 3500.

[@Justthemow]

My def gauge isn’t lying to me it says empty all the time I think I heard some parts fall off my truck a little while back and ever since it’s been on empty but no limp mode so I guess I’m good

[@01tangodown]

Mine stays on full all the time and I never have to add def since I deleted it 😎

[@LeeFamTV]

I overfilled DEF last time and I got the engine light on. I had to drive about 80 miles to erase it. I will never overfill DEF next time.

[@rjl7765]

Seems to be the same as my 16 Ram, I drove it for months after I bought it before the gauge moved. I also had a problem last winter. The dealer said the DEF injector failed, fortunately it was replaced on warranty. Is your truck max steel color? It's hard to see on video, Mine is max steel, love that color

[@kevinmaharaj08]

How to fix and p204f.and whats the meaning of that fault code

[@MarionBlair]

Is that the ECO diesel or 2500?

[@ki6lkp]

Thanks Marion. As with others, mine literally sips DEF without a load. And, since Marion has mentioned this stuff has a shelf life, I try not to refill until it gets really low. Does anyone know if there is an idiot light on the DEF gauge like there is on the fuel gauge? I've never been quite that low to find out.

[@MarionBlair]

Yes, It's a warning message on the EVIC.

[@n2snow]

I fill mine up when gauge hits 3/4. It always holds 2.5 gallons.

[@MarionBlair]

Yea, it's amazing how much more it can take if you fill it all the way

[@azrooster602]

my truck is the same . i'm thinking remove DEF ?

[@gunfreak565]

It’s the gauge! It doesn’t start reading till about 60% capacity. The tank is deeper than the heater/pump/gauge assembly. It doesn’t use a float like typical in a fuel tank we are use to. Motorcity mechanic (if I got his KZbin channel name correct) has a video on this and a cut away tank to show what I’m talking about here’s a link kzbin.info/www/bejne/mauti6iZbbmbnqs

[@YourDadsBoyfriend]

The problem with your "DEF" gauge is that it still has power going to it.

[@kahxb3kahxb375]

Marion, any difference in DEF quality between what you get at the truck stop pump and the Blue DEF in stores?

[@MarionBlair]

No. The jug stuff is probably a little cleaner but the truck stop may be fresher. I prefer the jugs. No chance for contamination.

[@thetechguy6004]

Hi there. Quick question, what monitoring device are you using to monitor the various sensors on your truck such as EGT?

[@MarionBlair]

Banks iDash data monster. kzbin.info/www/bejne/q4KspotsaNyJjpI

[@thetechguy6004]

@@MarionBlair Thank you! Don't know how I missed that video!

[@Cadillaclife2023]

Iv only put 1500 miles on my brand new truck and the def is at 1/4... WTF

[@MarionBlair]

Put 2 1\2 gallons and see how many miles to get back to where it is now. They show full when they are. Really not. If. It came from the. Dealer, possibly used a lot at idle. In trsnsit.

[@Just_Joe71]

I am using about 1 gallon of DEF per 200 miles towing.

[@MarionBlair]

That's a lot!

[@Just_Joe71]

2018 Ram 3500 towing 15k fifth wheel🤷‍♂️

[@jasonwinekoff5555]

I ran 3 full 31 gallons on diesel through mine before I added 2.5gal DEF to fill mine to the 100% mark

[@ednieves3973]

That's normal when you fill it up all the way to the very top.

[@lawrenceconstantine7735]

The gauge is already lying showing over full.

[@douglansburg4545]

I managed to put in 5 gallons with being about 100 miles past half 2019 truck

[@MarionBlair]

Yes same as my experience thanks

[@gregbrown5224]

You can have mine.

[@herculesinwyoming]

Mine definitely is lying.

[@jdhreiss]

Had 1/4 tank showing - added 2.5 - showed full.

[@jdhreiss]

Wonder how many gallons are in EACH quarter tank?

[@MarionBlair]

yes, you could have put another 2.5 gallons on top of that.

[@mikeshotshot3778]

I’m having problems with my fuel gauge not getting to half on the gauge when I fill it up. I only have 9000 miles on my 2019 2500. Any ideas?? Thanks. 👍✌️

[@MarionBlair]

I'm hearing that a lot. The problem with an older truck was the fuel tank unit..

[@securenc1]

I don't trust my DEF gauge... I always carry extra jug in back of truck.

[@Cumminspower365]

This guy is like watching paint dry

[@MarionBlair]

Can you imagine me watching paint dry, now that's really boring.

[@TCB031]

Marion, any chance that the bucket that you siphoned into was a 3 gallon bucket and not a 5 gallon? That might explain the quantity that you got out...

[@MarionBlair]

No, it's 5 and I put two 5 gallons with gauge reading 3/8 to fill it.

[@gregbrooks3577]

My F350 lies too.

[@johnsathe2429]

The mileage for DEF is about 2000-2500 mi before it comes off full. There is an ultrasonic sender inside the tank. It does not go to the top of the tank and only senses by ultrasonic waves when the DEF is at or below the the sensor. It is about 1 1/2-2 gal of fluid. You will be warned when it gets low, you will have at least 300 mi, maybe 450 mi before any action is taken by the computer to derate the engine. That is working perfectly. At the 1/2 mark on the gauge, you can add 2.5 gal and be OK for cold (freezing) weather. It is just fine, you are way over thinking this.

[@fjb4932]

How much is "213.5"×13.5 gal" ?

[@MarionBlair]

Good question

[@johnsathe2429]

That's amount my auto correct tends to put in and I don't proofread. I'll fix it.

[@Dtileandremodeling]

what camera are you using Marion? you recording in 4k?

[@MarionBlair]

It's a Canon 80D 1080P

[@eutimiochavez415]

What is the def for

[@MarionBlair]

Diesel Exhaust Fluid, turns Nox into nitrogen and oxygen.

[@rocklynroll2311]

At some point there maybe a simpler solution to clean up your truck.... if you know what i mean.... less items to give you fits and less items to break... just a thought.

[@MarionBlair]

It's coming.

[@tomahawksteak6672]

My ram will suck down a tank of def in about 1k miles will tow a 12k trailer .

[@MarionBlair]

That's a lot? What year is that?

[@anthonyramacciotti1997]

Really. Has no idea what he is talking about. Not being derogatory or disrespectful but the issue is not with the fluid. Let me explain. As def drops over a period of time, and we do not maintain the level, def crystallizes and turns hard. So when you try to fill it back up, the sensor reading will be inaccurate. This is when you test or drain, this will explain the volume difference. The fix is to remove the float, should be a long tube , and put in warm water, this will clean the the tube and should give a better reading. This is the system that it is in most commercial trucks. My creditials are a warranty Manager with a cummins service Dealership

[@MarionBlair]

Now that's a new one and there is no float in this system. It's sonar. You need to do a little more research on DEF. But thanks for watching

[@toddbob55]

Chrysler is copying GM using garbage parts especially gauges in the dash..... Buy a FORD problem fixed.

[@MarionBlair]

It's the tank level that the problem in this case.

[@mariohercules2703]

Do your self a favor, throw out the DEF, change the muffler and you will never have any problems again. How diesel engines should be running. Amen

[@MarionBlair]

Agree but the EPA is on our tails

[@reggien737]

Youre going to be really disappointed when you look up your oil pressure and oil temperature gauges

[@firehawk6188]

I bet you think there's an actual sending unit + float like is in a fuel tank. Nope. Do some research and you'll understand why the gauge is just a calculated guess vs actual reading. It's not a big deal.

[@l8tapex]

Houma. 2022 Ram same issue dumb design.Thanks