Tech talk #7: Ram Diesel DEF fluid gauge stuck on Full

Please use the following link when ever using Amazon.com. Any purchases you make on Amazon will help support this channel.
amzn.to/2mALgqS
Everyone loves mail! Feel the need to write a letter or send something cool?
Motorcity Mechanic
P.O. Box 240
Grovetown Ga, 30813
Please help support this channel by any means such as word of mouth, sharing the links, or by donations. For donations please click on the "support" button on the right side of the main channel page: / vipertech30813
Motorcity Mechanic is your online source of Chrysler, Dodge, Jeep and Ram repair videos. The videos are designed to help everyone from the average DIY, all the way up to the professional level tech. Make sure to subscribe so that you get notified of all the new videos that keep getting added weekly.
Link to this video: • Tech talk #7: Ram Dies...
Check out and "Like" our Facebook page: / motorcitymechanic
Check out and "Follow" our Twitter page: / motorcitymech
Find me on instagram: / motorcitymechanic
Email me directly at [e-mail]
(335)

[@BackRoadsOutlawsRC]

It’s amazing how you can pretty much look up anything on KZbin and find the guy that really knows his shit… Brother I got a 2015 dodge that the DEF gauge hasn’t moved in two or three months… But I don’t drive it a lot either I think in that three months I put maybe 1000 miles on and I was starting to really freak out this morning as I was driving it because it still hadn’t moved off the full gauge, so I will keep watching it. Thanks for the wealth of info… You probably just save me a pile load at the dealership of checking and getting a bill for it…😊

[@waylandwilson9752]

Thanks David! Glad to know that it was not broken because didn't know what was going on.

[@MotorCityMechanic]

Not the best of designs but most likely normal operation in your case. Thanks for watching the video!

[@ASobhi-uc3ih]

Not everyone can explain things clearly - you sir are one of the few - well executed

[@MotorCityMechanic]

Many thanks for those kind words! Its greatly appreciated. Make sure to subscribe!

[@boxysquare]

I always wondered why it showed full for so long, thanks for the info! The only "simple" fixes would be to change the overall height of the pump and sensor to match the height of the tank, or change the tank profile to bring the top close to the top of the pump. But for me I'm happy that it works as is.

[@MotorCityMechanic]

Your correct....it would require a modified pump assembly. Its what we have to work with at this time. Thanks for watching the video and for the comment

[@jimlane3962]

I love your videos they are very useful and helpful. I was waiting for you to explain that the DEF tank does not use a float because DEF can freeze and would damage a float. Thanks again and keep up the good work.

[@MotorCityMechanic]

I hadnt been told why they didnt. They dont make mention of alot of things so sometimes I have to assume or try to wonder why. That would make since none the less. Thanks for the info and for watching the video. Keep watching!

[@wise400exco]

Good video. Don't know anyone else with a Cummins so nice to learn about how this works

[@MotorCityMechanic]

Thanks and your welcome. Appreciate you watching and for the comment you left.

[@TomSommer]

Of course I'm going to take your word on this. Great explanation. I have heard talk of this issue. Thanks.

[@MotorCityMechanic]

+Tom Sommer Thanks Tom. Its a topic that comes up once and awhile from our customers.

[@meadowviewlawncarellc8079]

Nice visuals. Good explanation. Happy my diesel was pre def. one less nonsense system to worry about breaking.

[@MotorCityMechanic]

I feel the same way. Our more common issues are related to the DEF system lately.

[@redpickles1]

Thank you David, well done. You answered my concerns about the gauge informatively and straight to the point.

[@MotorCityMechanic]

Your welcome Rory. Glad that I could be of help. Appreciate you watching. Make sure to subscribe and keep watching.

[@wyattoneable]

You did some work to prepare for this video. Nice visuals. The explanation was perfect too.

[@MotorCityMechanic]

Yeah it took a bit of time to get my hands on a used DEF pump and sacrifice a blue plastic storage container lol. Some times it just calls for a visual explanation. Thanks for noticing the small things that make the video complete

[@harleydressler5136]

Thank you ! Thank you ! you sure put my mind at ease with your great video.

[@MotorCityMechanic]

Your welcome. Glad I could help out. Thanks for commenting and make sure to subscribe.

[@mrfarmer532]

Motor City Magic ! Thanks 😊

[@hikethisplanet1017]

Thank you very much My 2020 Ram is doing just what you described. Keep up the good work. thx

[@ednieves3973]

Excellent video David.

[@MotorCityMechanic]

Thanks Ed!

[@cavazosa4]

Once again I learned a lot. Great visuals as others have said.

[@MotorCityMechanic]

Thanks for watching another of my videos. Learning more about your vehicle is exactly what these videos are about. I appreciate the feedback

[@ColettaT]

Thanks for explaining the tank.

[@raykrv6a]

I have a 2014 Ram 2500 and the def gauge takes a while to show full after filling to the top and doesn't move down for 2000 miles or so. Good explanation on how it works. I wondered. Thanks.

[@MotorCityMechanic]

Your welcome and thanks for watching. Make sure to share the video

[@deant876]

I just picked up a 14' and have never dealt with DEF in a pick up. I was questioning if the gauge worked. The trucks at work have the 15L Cummins ISX and we are 160,000 lbs (fully loaded). We get 3.5-4 mpg of fuel. They have a 15 gal Def tank and that will last just over 2,000 miles

[@chadpyrtle8487]

Appreciate ya bud. Good information. Was getting lil worried.

[@jimm2442]

Great Video, thank you!

[@fastone371]

Great info and nice presentation, well done!!!!!

[@fastone371]

Liked and subscribed.

[@MotorCityMechanic]

Many thanks Bob for checking out the channel and for subscribing

[@ojmful]

Thanks for the info. 👍

[@wise400exco]

Great! I've always wondered what causes that!

[@MotorCityMechanic]

Your welcome! Thanks for watching and make sure to subscribe

[@gspainting11]

Excellent demo.

[@MotorCityMechanic]

Thanks Manny. Appreciate you watching it

[@timothydecoursey7546]

I like this guy. He’s has great videos.

[@JackHunnicutt]

David it would be great to learn about the DIC code "Bad DEF Detected" and how the technician would test the DEF and determine if the DEF is actually bad. It is a big concern for Cummins owners to ensure they are getting "fresh" DEF since I understand it is very expensive to resolve one of these Bad DEF problems. Thanks and keep up the great work!

[@MotorCityMechanic]

That exact same thought came the other day when I was thinking of other videos to film. I do eventually plan on doing that some make sure to subscribe so that you get notified when I do a video such as that.

[@cameronhancock5597]

Great video! Thank you

[@gilberttimon8895]

Think you so much

[@MotorCityMechanic]

You are welcome Gilbert

[@AndreRibeiroA2R]

Great stuff. Thanks!

[@JGORDON18]

I'm here because I was starting to get worried. I think my needle moved a millimeter down today and I have almost 3k miles on the DEF tank. Thanks for the explanation and awesome video.

[@MotorCityMechanic]

The mileage will vary based on how the truck is used as you have seen. It's been a concern that I have heard from a few and that's when I came across the explanation of what was going on. Thanks for watching and make sure to subscribe if you haven't already.

[@JGORDON18]

Sure have and thanks again for all you do.

[@MotorCityMechanic]

Your welcome and its all about you the viewers...if you didnt watch, this channel wouldnt grow. So thank you!

[@johnjasonchun7905]

Super Excellent Instructions.....

[@gunfreak565]

My gauge for DEF has been stuck on full for over 30,000 miles 😉

[@Luis-io7nd]

I have the same problem with mine is stuck 37,000

[@joehinkle3603]

the code from autozone is p203f and p20e8 fill or replace as necessary def but the tank is full it takes aprox 2 hrs of driving for it to recognise its full

[@Matt85ism]

good video, the gauge on my 2018 Ram 2500 didn't start to move until around 2500 miles.

[@MotorCityMechanic]

I never understood why they set that system up like that....none the less at least you know its normal. Thanks for watching and for the comment. Make sure to subscribe

[@madridcollaku]

You are a king 👍

[@MotorCityMechanic]

Thanks Lucky Luke! Appreciate the comment. Make sure to subscribe!

[@bobmakowski7627]

Great info, thanks

[@danielholland4385]

drove my 2500 from central texas to florida and BACK with my DEF sitting on full!!!! no fluid loss, no usage... went to stealership, they said my pump had failed and the nozzle was clogged up. i deleted., but i NEVER tossed a def light, warning, anything... maybe i should have tried to drop the cooker underneath before i deleted but too late now!

[@freddougherty1635]

Hope this isn't a repeat question. So because the top of that sensor is a bit above a 3/4 full tank, is it calibrated to indicate 3/4 full on the gauge when air hits it? Or is the top of the sensor calibrated to indicate full ( even though the tank is not full ) as air just begins to hit it? Learned a lot watching your videos. Thanks

[@greenhorn223]

Thank you very much I appreciate your information is very helpful .

[@Robert-to2tu]

Thanks 😊

[@jaconijaconi7728]

Hi David have you made or thinking of making a ZF transmission fluid change video for the 2015 ram 1500 ecodiesel and at what mileage would you recommend changing. Please let me know. I really appreciate your video's very helpful. Thank you.

[@jaconijaconi7728]

2015 eco I always fill at half tank because, I buy the 2.5 gal jug always worked fine 70k miles

[@MotorCityMechanic]

Nothing wrong with that......use only whats needed.

[@marqn4154]

It sounds like crystallization because when I clean my EGR valve the truck started using the using the DEF fluid again for a little bit about quarter tank of death and then it just stopped using it again

[@gapadad2]

Great video, Thanks. I just bought a 2014 Ram 3500. The DEF is past the full mark. I ran a siphon hose down about 3ft and did not get any DEF. the DEF gauge goes to empty when the engine is shut off. I'm not getting any errors. Is there a way to test the sender? Is there a drain for the DEF?

[@anthonystrother9117]

Holy Crap! This was awesome, thanks man! My 2015 3500 has this same issue, twice now. The first time the dealership replaced the sensor. This time I am on the fence about whether or not to take it back in. I have driven it enough to get the tank level down to about half, so 2 1/2 gallons approx remaining. I know this because I topped it off, to be sure where the level in the tank was. Is there a separate sensor for this or is it all just that module in the DEF tank that you show in your video? Any idea how many miles vs DEF the 6.7ltr Cummins uses? Thanks again! Tony

[@nvhswrestler22]

Damn, thanks!

[@donaldrichardson4956]

Great info

[@MrCquixote]

I filled mine up and have 750 miles and no movement, I guess that I shouldn't worry until about 2k miles. Ahhh, technology - solving problems you didn't know you had.

[@benniejames8766]

great video

[@MotorCityMechanic]

Bennie James Much appreciated Bennie! Make sure to subscribe.

[@Ltngdrvr]

Don't know if the gauge and tank have changed, but my 2015 RAM 2500 has almost two gallons of space above the sensor apparently, not just a half gallon. But, at least I know now that the pump and sensor is in the bottom of the tank, not the top like my old f250. Interesting to finally see an example.

[@MotorCityMechanic]

I have seen many that go alot more miles than I mentioned in the video before it starts coming off of Full. May be affected by the load of the vehicle and if anything is being pulled. None the less they all behaved the same as in the video...once it reached the level unit.....it started moving. It certainly causes customers to worry the first time they notice it even though its normal operation. Thanks for the comment and make sure to subscribe

[@Ltngdrvr]

My understanding is that DEF usage runs around 2-3% of fuel usage, so 2-3 gallons of DEF per 100 gallons of fuel used. So, for an unladen truck running down the highway, getting 20 MPG, would go 2000 miles on 100 gallons of fuel, and use 2-3 gallons of DEF. So, if it was like my truck, it could go as much as 2000 miles before the DEF gauge starts to drop. And, for mine, when towing a large 5th wheel travel trailer, getting 10 MPG, it could go 1000 miles before the gauge drops.

[@tjkoen01]

Have you actually taken one of the ecodiesel def tanks apart? Everything I have read states that the level sensor is built into the tank and is not serviceable, tank must be replaced if it malfunctions.

[@patrickkillo9918]

Just took a def pump off the 2017 RAM 3500 for this issue. There is no float at all and still with ZERO DEF in the system the gauge shows full. Still better than it showing empty!!!

[@meseahunt]

thanks

[@MotorCityMechanic]

Your welcome!

[@TheMinnow101]

Great Video !! If you get a RAM into the shop that needs the DEF changed out (BAD DEF - SEE DEALER message) would you do a video on that process. I understand that the DEF tanks needs to be emptied and cleaned and a new DEF pump installed. Would be interested in how that process is completed. Also what is your experience in seeing these trucks with this message ? Is it widespread ?

[@MotorCityMechanic]

I worked on a DEF pump replacement and when done....found out I had not recorded any audio! I mean what the heck. Not a good day that day. The fluid needs to be tested first to see if that fluid is the issue or if there is another issue such as the catalyst. There are test strips on the market for DEF and also a specific gravity tester will work as well that you can use for antifreeze or battery acid. All this depends on the code you have. Curious if you know the specific code. Then I could tell you the most common cause and if its a widespread/common issue.

[@forrestmiller4055]

Why wouldn't we believe what you are saying....your the go to channel for Dodge/Ram help....

[@Over_the_Hill_RV_Rookies]

Great video! Excellent explanation. Numerous times the DEF gauge on my 2021 RAM 3500 stays around 1/4 to 1/2 full for extended period of time, the suddenly drops to 0 & I get the dreaded limp mode in 200 mile warning. When I add a 2.5 gallon container of deaf it reads 3/4 to full. Any ideas on what might be causing that?

[@jesushernandezbrito3342]

you the best!

[@darryladams519]

Gotta love it when that stuff falls off on a dirt road.

[@MotorCityMechanic]

Haha......why do I feel I know you? Yeah you have to stay away from the dirt roads for sure......the can cause havoc on these trucks lol.

[@darryladams519]

@@MotorCityMechanic scr recall not needed on a white 3500 drw

[@MotorCityMechanic]

@@darryladams519 Its always the white ones lol

[@JoseSoto-jw4jr]

I just purchased dodge 1500 eco diesel 2016 about two weeks ago the def gauge was at full and it’s on halfway point now but has not moved at all I’m also new at owing a diesel truck any hints of why that isn’t moving

[@el24najera]

It will be awesome if you can do a video on how to flush drain the def tank theres no videos related or n how to do it

[@MotorCityMechanic]

el24najera I will certainly keep it in mind if I have one come on for the repair. Thanks for watching and subscribe if you haven't already

[@ron6575]

Mine went to zero and through p203B code. Still runs fine, but sounds like it's time to fix it for good.

[@milandjukic6213]

Hi David I was reading on the Cummins website that there is a filter in the DEF tank. Is this true? And does it need to be changed? I have a 2014 ram 3500 not a dually! Thanks!

[@areterr]

Is there a way to reset the engine will not restart code. I had put bad def. But I clean it out and put fresh new def

[@davidmolzahn3630]

Hi David could you tell me how to check my def pump if it is bad or not ?

[@joehinkle3603]

david tank is full 5mph notice appears downloaded solution is to fill the def tank but def tank is full. it takes a while for the unit to recognize that its full 300,000 miles on truck. thanks for the great videos do you know what the problem might be?

[@MotorCityMechanic]

If that message comes up then most likely there will be an issue/code present so having the vehicle control modules scanned is the next step. That requires a special scanner that can access all the modules. Then with that info we will have a direction to go in....otherwise its just a guess at this point.

[@lindseyangell986]

1,000 miles for gallon. Nice to remember

[@keithbernhardt9748]

What about an 8.5 gal d e f tank in an ram 1500 that drops and sticks to 1/2 when I add d e f to the tank. And also at the same time gives me an engine code for the float miss reading. This started at 65000 miles now many resets later now at 7200 miles still resetting the codes every 30 miles or so. Pulse the d e f Sending unit on my tank in mounted in the top very difficult to assets the problem when the tank is over flowing full please need some help.

[@homergarcia9722]

Do you have a video on how to take a truck out of limp mode . I change the injector and the SCR . But still won't come out of limp mode . Help my trucks been down for weeks .

[@MotorCityMechanic]

It may take running the prime and pump test on the DEF pump to make it pass and allow you to clear the code. Depends on what the original code was and it the issue has been fixed.

[@timnolder5153]

2019 ram 6.7 Cummins, filled def tank, the gauge did not move and service DEF SYSTEM MESSAGE CAME UP, 5MPH max speed in 40 miles

[@mts6409]

Hey, I'm working on a 2013 Peterbilt 379 with Cummins isl9 in it. Def gauge is at 99% but led on the gauge is flashing. This has caused the truck to go into a derate, only codes present are derate codes. I suspected a fualty def level sensor so I replaced it...did nothing for me, I can physically confirm that the tank is full. It performs and completes forced Regen, monitored live data all falls within range. Checked continuity from level sensor to ECM good, ECM to gauge good. Really stuck on this one. Any idea where to look? Thought with no actives codes leading to the fualt. Any help would be great, thanks.

[@nicolearaneda4746]

Hello how are you! I introduce myself my name is Eduardo and I have seen your videos on youtube and are very professional. I buy a ram 2500 laramie 6.7 2015 and always felt that sometimes the engine sounded weird, it was near the turbo as if a hose blowing somewhere and the engine sounded stronger and ugly, then 5 months rekindled check engine with error sensor turbo and was remplacado new one, eight months after the EGR valve will get dirty, 6 months after the same and now I came out the dpf is 100% full but was cleaned and regenerated, but the sound near the turbo back and loses power and consumption is greater. When I go to 60 mph loose the accelerator the truck is like walking braking and turbo bar are at 0

[@nicolearaneda4746]

- the sound is similar to when the engine is cold - the strange thing is that when you open the door the sound is removed - Also the sound is removed when in parking mode - Fuel consumption is higher (diesel)

[@nicolearaneda4746]

I want to point out that when it has that sound the turbo drops to 0 bar - the dpf was checked and clean - the egr valve was checked and was clean (Because of that sound the dpf has been saturated but regenerates automatically) (I also regenerated manually by accelerating to 1900 rpm in N or P mode for 6 minutes)

[@MotorCityMechanic]

The main way to check all this is looking for codes and also monitoring the data. The data will tell if there is a turbo issue and also tell you the status of the DPF. Not sure how you have having the DPF checked......The data gives the soot load which tells you the over all health of the DPF. Otherwise we have alot of symptoms but it needs to be checked further using a scanner to look over the readings.

[@jaredgriffin4761]

Hey David! So, thanks so much for explaining the gauge in the DEF system... I always imagined it was a float switch, so I thought the fluid calcified around the lever, freezing it up... That being said, My DEF gauge was pegged at the 50% mark for a long time (not sure of the mileage, but it was a while). I was getting worried about it, so I added 2.5 gallons yesterday. I started my truck up (Ram Ecodiesel 2014), and the gauge went to just above 75% full. Can you explain why my gauge would peg at 50%?

[@MotorCityMechanic]

Morning Jared. About the only thing that I could think would cause this is a possible level unit. I would have it checked for codes and also see if it happens again before going to far into it. Thanks for checking out the channel and make sure to subscribe

[@jaredgriffin4761]

MotorCity Mechanic after clicking around on KZbin and continually running into your useful videos, of course I subscribed! And I guess I'm taking it to the dealership then to have it checked out. Out of warranty, too :(

[@MotorCityMechanic]

Like I said....I would wait to see if you see it happen again. That would also be the best time to take it to the dealer so that its happening when they check it. Drive it until you dont see a change for a long period of time first. Otherwise they may just guess then again they may guess either way. Best to have it happening either way. Thanks again for having subscribed.

[@pedrodiaz4343]

Great video, thanks. What would be a possible cause/solution for the “incorrect DEF fluid detected” error code? I have a Ram 16 2500, have been using the same type of DEF for the past 2 years and have had zero issues.

[@MotorCityMechanic]

Most times its not the fluid....it still has to be checked. Typically its a sensor or SCR cat thats going bad that causes that false reading. It will require some further checking to be sure. Thanks for asking and make sure to subscribe.

[@bradym7198]

Hi wich sensor you talking on this post

[@nolanschwartz7306]

I bought a used truck with 36k miles. Filled the def tank and have driven 4k without it budging. Do i have a problem?

[@desirayowen8042]

maybe you can help me my truck is a 2014 dodge 2500 cummings my def is stuck on empty it is full but reading empty what can I do to reset it

[@homergarcia9722]

desiray owen I have a 2015 doing the same thing I need the know how to reset limp lode

[@daydaysaint6657]

I have a 2015 dodge ram eco-diesel. It says see the dealer or your vehicle will not start it’s down to 3 miles is there anything I could do to try to fix it I don’t have a lot of money

[@saskatchewanace]

Question about def in2015 ram 2500 . My def gauge will not move and sit on the half tank for about two weeks or about 2500 miles of use. Then all of a sudden will drop to the empty mark on next start. Could this be caused by the minus 30 degree weather I use the truck in. ???

[@MotorCityMechanic]

Typically that means that the pump needs replacing because the sound board (def level sensor) is acting up. I havent seen temp affect it. With things possibly warming up you could keep an eye on it and see if you noticed any patterns of when it happens such as temp like you mentioned. Thanks for asking and for watching.

[@Evski-if4gn]

Can you do one when the DEF gauge is saying it’s empty even though you know it’s full

[@backwoodsguy2028]

My d e f tank is full but my gauge is showing it's almost empty my truck is telling me I've got 370 miles before I run out and the truck will not run how do I fix it

[@sarah56082]

What happens when the gauge won't increase after filling? It is stuck at 1/4 tank

[@juancarlosayala4757]

I have a question my freightliner cascadia 2011 the def fluis is not consuming the green lights stay at 2 bars

[@MotorCityMechanic]

Wish I could help but I dont have any knowledge on that brand of vehicle

[@marqn4154]

The problem I'm having is now the truck is starting to lose power I'll clear it out with diesel treatment and then it runs good for a little bit and then it'll start to lose power I lose power I let my foot off the brake and and then it'll kick back it's like it's jumping back I changed my fuel filter as oil changed I even cleaned my EGR valve a little late but..... I'm just hoping this isn't a $1000 thing

[@rollingacresfarmstead206]

I see im late to the party ram 2017 3500 31k pulled a camper this weekend 37ft cherokee. About 1000/1300 miles were with the trailer on. Gauge didnt move, thought it was stuck. Tried to fill it up about 800 miles into the return trip total .347 of a gallon. No cel runs fine edge monitor has no codes, and egt temps around 1000-1250 and 70 mph. Any ideas?

[@Ltngdrvr]

Well, from personal experience with my 2015 2500 RAM Mega Cab CTD, I can tell you that as soon as you see the gauge start to drop, it will take about 2 gallons of DEF to fill it back up, not just 1/2 a gallon. And DEF usage depends on load, higher load, lower fuel economy, results in much higher DEF usage. I have seen as high as a gallon of DEF used in 250 miles when pulling a heavy trailer.

[@MotorCityMechanic]

Thanks for the personal experience. The 9 gallon tank can be found in more then just the cab and chassis so you may have the 9 instead of the 5. Just depends. But none the less as you stated.....the load on the vehicle surely has an affect on the DEF mpg. Thanks for including that info for other viewers to see and take in as well. Much appreciated!

[@Ltngdrvr]

Well, no RAM pickup has anything bigger than the 5.5 gallon DEF tank. I wish it did have the larger tank, but it won't fit a pickup chassis. I did appreciate seeing the DEF pump and level sensor, though. The only other one I've had apart was on my old ferd f250, totally different setup.

[@kscumminsdriver]

Exactly. On my 2013 2500 MC, I'm averaging 1470 MPG on DEF lifetime (I don't tow)... when I fill up with DEF I expect to go around 3000 miles before the gauge moves a noticeable amount... on my last fillup, I had gone almost 8300 miles on my tank of DEF.

[@MotorCityMechanic]

Thanks for the added info and experiences!

[@aharleyguy]

Dave, i got a DEF Gauge stuck on 1/4 left in the tank. Just above the Red Zone. Also started to get a code P203E. Research is telling me the sending unit mounted in the tank is gone bad. This sensor is molded into the side of the tank and if it goes bad you have to replace the complete DEF tank. ? Crazy right. Now you just showed the level gauge is in the fuel pump. (air has to contact it so it can read ) So who is correct? The dealer replaced the tank, did not fix the gauge problem, now they are going to replace the pump? I am not sure this will fix the gauge problem, still waiting on the dealer to complete the work. I thought if the pump was bad i would get another code? Your thoughts on this please.

[@bricksquad601]

What was the fix for code P203E?

[@damiansmith4782]

David I have only bought blue def since I've owned it. I just got a check engine light and an message on my 2015 2500 mega cab 6.7 diesel with a wrong def fluid detected message on the dashboard message center. There has been no contamination to my knowledge. Any help Sir would be greatly appreciated.

[@MotorCityMechanic]

The first step is to check the codes and see what is present. Then testing of the DEF fluid may be next. The issue could be the fluid but it could be something else like the SCR catayst or a pump/injector issue.

[@SuperMrcat]

Have you done a video on changing the level sensor/ DEF pump on a 2016 Ram 2500? I have a new one here in New Zealand that's right hand drive and only done 4700km and the level sensor started reading all over the place till finally it started the countdown and now it will only do 8kmh even though the DEF tank is full, it's back at the dealers and a new sensor is on order from the states.

[@MotorCityMechanic]

I did do a video and the found out that half the footage didnt have audio! So the majority of it became useless. The pump mounts to the bottom of the tank. You could try to disconnect the tank filler neck loose at the tank and siphon the DEF fluid out or you could place a large catch container under the tank/pump.....large enought to hold all the DEF that will come out when you take the fuel pump lock ring off. I usually take it loose but let it stay in place until all the DEF comes out and into the catch container. Reinstall is the same way. Some times it take a scanner to actuator the "priming" feature of the pump so as to get all the air out. Sometimes its not needed. You will know because it will set a code for pump pressure if the air becomes an issue. The pump also has a metal insert/orifice in the outlet nipple.....just make sure you dont lose it. If you feel you might have issues......I am always open to flying there and showing you how....just need some plane tickets mailed to me haha.....always wanted to see New Zealand. Thanks again for the question and make sure to subscribe!

[@SuperMrcat]

Thanks for the offer, but it's in the hands of the local dealer, I just couldn't find anything online about changing out the sensor and it was more curiosity more than anything. I do see in the forums that this sensor has ongoing issues for some owners, in your experience have you found this to be true? I am considering bringing another new sensor into NZ myself and putting it up on the shelf until it does it again and then it's just a matter of getting it into the local dealer and they swapping it out again, and then the dealer giving me back the warranty supplied one again once they receive it from Dodge, as this way it won't be off the road for a week or more waiting on a new sensor from the states as long as they use DHL, otherwise its 3 weeks to ship it here.

[@MotorCityMechanic]

SuperMrcat Now the sensor is part of the DEF pump and can't be replaced separately. It's not something I see often. Last one I replaced was about 6-8 months ago. I don't see ordering one as back up due to price and not being a very common issue.

[@SuperMrcat]

Thanks David, your experience is much appreciated, I'll put this one down to just a faulty unit that once it's started getting used has simply failed as the truck is virtually new, if it happens again I will bring my own pump/ sensor in as it costs me a lot more money without my truck to tow my heavy gear for work than the cost of a new pump. I have seen a new one on Ebay for about $430NZ so that's not too bad if it gets my truck going in a few hours for them to fit it.

[@MotorCityMechanic]

Just make sure its a Mopar replacement and not so other aftermarket company. I dont trust the non-OEM companies any more.

[@marisolsalcedo3707]

I have a dodge ram 2014 Laramie and I change the def tank is not marking the def gauge why did you call suggest me thank you

[@zachlettunich8860]

Where could I get a pin out of the harness connector at the def pump or def module? Thanks great video!

[@MotorCityMechanic]

email the vehicle info such as year...make....and model to [e-mail] and I will see what I can find for you.

[@giannileyvaperez8]

One question I have the tank almost empty, and I try to put DEF and it doesn't go down, it throws it back, can you tell me what to do, it's a ram 2500

[@cz503]

P 204 A just showed up . What you suggest Sir ? 2022 6.7 3500

[@lvnsnaperify]

I love the videos and I am also a mechanic. I have a very dumb question for you though. I bought a2016 ram 3500 and I have no clue how to do the def refill. Can you do a video on that?

[@Sicktrickintuner]

Go to a truck stop, get def and pump it in like fuel

[@lvnsnaperify]

I don't have any close was going to get the gallons

[@MotorCityMechanic]

+nick angwin Its fairly simple.....much like using a gas can to fill up. You can just about buy DEF everywhere these days and some come with their own filler tubes and others may need a simple funnel.

[@lvnsnaperify]

Will it still every where when full or just stop taking it

[@MotorCityMechanic]

If you are filling with bottles of DEF......it can spill out once full. Just add slowly until it reaches the top and then clean off.

[@belka123]

Decided to fill mine up from before red. Niddle didn't budge. Next day got low def message even though tank is full... How to fix stuck on low

[@999insect]

Mine is doing same thing, it is full but gauge keeps going down. Now 200mi to derate. My '15 & '18 always had to have a software update in Feb

[@martinperez3444]

What about If is stuck on low

[@user-qv5en7wn3j]

My gauge is stuck on empty and def light is on. Bad unit?

[@larrysciblo3509]

Whats a cab chassis? My 2500 only has a 5.5 Gal DEF Tank, like most other folks. After 2500 miles still stuck on Full. =(

[@MotorCityMechanic]

Chassis cab is the trucks that came from the factory with no bed on the truck

[@robertelee2797]

another great video! I was speaking with a 15 Ram owner recently who said he had reoccurring def issues, particularly when idling for extended periods. have you heard of any issues like that? thanks

[@MotorCityMechanic]

There should be codes present. I have see different issues.just depends on what code they are getting.

[@jeffreyaviles1967]

What about if is tuck on empty

[@timothydecoursey7546]

In my case the def guage went straight to zero and throws a code along with engine light and def light. Both codes are def codes. Is my truck going to stop in a 190 miles.

[@MotorCityMechanic]

Usually it lowers the speed of the truck so that you cant drive but a very low speed.

[@backwoodsguy2028]

@@MotorCityMechanic what do you do when your tank is full but your gauge is empty and a Truck says you will only go 390 Mile and their truck will not restart how do you fix a seized shoe I tried everything I cannot afford $2,250 to replace the whole tank what do I do

[@thesaltysergeant4103]

What about when you have the opposite happen? It is filled up full but is not reading properly? Mine is telling me that I am almost empty and yet I just filled it up. ? I do have an error message about an intermitant failure in that unit. Do I need to replace the pump?

[@MotorCityMechanic]

Most likely the pump/lever unit is bad. I still recommend having it tested further before throwing the part at time to be 100% sure. Thanks for checking the video out and for the question. Dont forget to subscribe

[@thesaltysergeant4103]

I went into my Local Dodge Dealership and they said to replace the pump will cost me 2000.00 Cdn Dollars. WTF. Why is this part so expensive!!! Should I look at parting one off of a wreck. I was floored.

[@rgwilder]

BSS did you get an answer to your issue? I have a 2014 EcoD that is doing the same thing. It's stuck under 1/4 tank, even after adding another 2.5 gal.

[@MotorCityMechanic]

Sorry about the delay......when it comes to the word Diesel it seems that the price goes up more. When it comes to wrecked on....I might be worried about how long the truck has been sitting damaged....remember its sitting in DEF and DEF breaks down over time so it could cause that pump/level unit to not be useable.