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Old 04-07-2015, 10:56 PM
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excess DEF consumption

Need to know if anyone is experiencing this? My 2015 Jeep grand cherokee diesel has 385 miles on it. When I took delivery of the vehicle I made sure the service department topped off the DEF. My instrumentation said it was at 100%. Now 385 miles later I have already used 25%. So at this rate I will get about 1200 miles out of the DEF tank. I thought the burn rate was closer to 10,000 miles. That is what the book and the maintenance schedule says. Is it just that mine is new and the consumption will slow down? Or maybe when I fill the tank next time the burn rate will be slower. OK, a lot of you have had your jeep for awhile. What have you experienced. I have no leaks, no warnings and DOM's plate is doing the job. Mike

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Old 04-07-2015, 11:34 PM
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Have Nov 13 build and I added Def at 10700 from a fill from delivery. I was just short a tick below 1/4 when I decided to add.
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Old 04-08-2015, 12:17 AM
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Re: excess DEF consumption

I'm at a little over 2500 miles and my DEF gauge shows about 20% or so used. Mine was overfilled by a dealer, however, so there was some extra in the filler neck. Basically, it's right on track for a 10K DEF refill.

Was yours on level ground when it was filled? I'm just taking stabs in the dark here.
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Old 04-08-2015, 03:19 AM
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Re: excess DEF consumption

The DEF tank on my May 2014 build was topped up to 100% by the dealer at delivery in June, and I have yet to add any more. At 7200 miles now, the DEF gauge shows a little over 20% remaining.
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Old 04-08-2015, 06:32 AM
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Re: excess DEF consumption

Quote:
Originally Posted by mbaessler View Post
Need to know if anyone is experiencing this? My 2015 Jeep grand cherokee diesel has 385 miles on it. When I took delivery of the vehicle I made sure the service department topped off the DEF. My instrumentation said it was at 100%. Now 385 miles later I have already used 25%. So at this rate I will get about 1200 miles out of the DEF tank. I thought the burn rate was closer to 10,000 miles. That is what the book and the maintenance schedule says. Is it just that mine is new and the consumption will slow down? Or maybe when I fill the tank next time the burn rate will be slower. OK, a lot of you have had your jeep for awhile. What have you experienced. I have no leaks, no warnings and DOM's plate is doing the job. Mike
The level sensor in the DEF tank is a very slow response ultrasonic transducer and is known to be inaccurate on initial readings. The initial 100% reading might have been inaccurate and once settled, you got a different value. Give it some time and see if now, when you have a stable reading, you still get a fast rate of decline.
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Old 04-08-2015, 08:35 AM
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Re: excess DEF consumption

What is your city/hwy mix of driving? since new mine is likely 30-40% city with this much Def after almost 700mi
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Old 04-08-2015, 10:34 AM
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Re: excess DEF consumption

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Originally Posted by akinney View Post
I'm at a little over 2500 miles and my DEF gauge shows about 20% or so used. Mine was overfilled by a dealer, however, so there was some extra in the filler neck. Basically, it's right on track for a 10K DEF refill.

Was yours on level ground when it was filled? I'm just taking stabs in the dark here.
Akinny: I had it done at the dealership. Ground in shop is pretty flat. Also don't know if it's close to full does it register full than drop off quickly?
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Old 04-08-2015, 10:38 AM
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Re: excess DEF consumption

For Jeep GC: Fortunately at this point it is mostly in town. We have about a 4 mile trip on the freeway back and forth between town. We will be leaving on a long trip to pick up a trailer. I may have to bring some DEF just in case the burnrate is high. Hopefully in a combination of inaccurate guage and in town driving. Mike
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Old 04-08-2015, 10:46 AM
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Re: excess DEF consumption

I should have clarified. I have done about 600mi since dealer filled the tank as it had some miles prior to purchase . Wonder if short trips add to Def usage?
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Old 04-08-2015, 10:50 AM
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Re: excess DEF consumption

Jeep GC: Hey I noticed your location. I'm leaving sometime in the begining of May from Southern Utah to pick up a trailer from Canam RV in London Ontario! Can I assume the cold weather will be gone by then. That is the long trip I was talking about. I'm hoping the DEF consumption will settle down. Mike
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Old 04-08-2015, 12:03 PM
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Re: excess DEF consumption

Quote:
Originally Posted by mbaessler View Post
Akinny: I had it done at the dealership. Ground in shop is pretty flat. Also don't know if it's close to full does it register full than drop off quickly?
On retail delivery, my selling dealer didn't fill the DEF tank like they were supposed to, so my local dealer agreed to fill it from their brand new 50 gallon drum for good will. I watched the local dealer fill it with the ignition on (engine not started) so we could watch the DEF gauge. The DEF gauge moved up every so often during the fill, but not smoothly. It had significant lag around 30 seconds or so. It registered full just as it spilled out the filler neck, so it would have likely registered full before that if the fill were slower.

Maybe yours just had an anomalous reading during fill that fixed itself after the next sensor update? From what I saw it updates maybe every 30 seconds, so I would expect it to stabilize within a couple minutes from the fill.

I think it makes sense to note your mileage and DEF % and check again in 500 miles to get a sense of your actual DEF consumption.

It's probably fine and there was just a sensor hiccup. From what I understand, it's actually an ultrasonic sensor (like sonar), so it's more of an estimate from multiple readings. With the fluid swishing around during a fill, I could see the sensor getting some erroneous readings until things settled down.
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Old 04-08-2015, 12:13 PM
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Re: excess DEF consumption

Hello all. I have also experienced high def usage. The book says it will last 10k mile intervals, but in another thread or another jeep forum people came to the conclusion maybe run hours are a indicator of def usage. I bought mine in October with 75% full of def. I will hit 14k miles on this evenings commute. I do about 50/50 city highway. I have added 12.5 gallons of def and at around 60% currently. I have mentioned this to the dealer but have not been given a clear answer on this high usuage
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