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FajitaMidland 06-01-2014 04:34 PM

Peak Blue DEF - Walmart
A couple of months ago I bought some Peak Blue DEF at Walmart and filled my 2014 Jeep Grand Cherokee up from 1/4 to 1/2 full. Last week I purchased two more containers and filled up to 100% full. A couple of days later the check engine light came on. My local dealership checked the vehicle with their OBD scanner and said it was either a clogged injector, clogged line or wrong DEF and the DEF would need to be flushed out of the tank. Said to bring it back Monday and they would have to keep it several days to figure out the problem.

Well in the mean time I bought a ELM 327 OBD scanner - 327 wifi
and hooked my iPad up to an recorded all the information. Seems to be only one instance in time that caused the check engine light light to come on - P2BA9 NOx Exceedence - Insufficient Reagent Quality. I checked the wiring to the injectors and they seemed tight.

This seems to be a permanent flag and will not clear automatically and must be cleared via a OBD II scanner. Having cleared the code the check engine light went off. Test drove 70 miles and today it has been about 100 miles with no further issues.

The DEF I bought was ISO 22241 standard.

FYI: I already have the latest 1801814b PCM software installed since my oil depletion rate was high.

So ... I am not sure what is going on. How sensitive are these sensors to the DEF being not correct?

philbytx 06-01-2014 05:58 PM

Re: Peak Blue DEF - Walmart
Could it be "old" DEF that was in the containers?

FajitaMidland 06-01-2014 10:01 PM

Re: Peak Blue DEF - Walmart
Philbytx --- thanks for pointing me in that direction. Looks like that could be the case...

I found the following link to FAQ Diesel Exhaust Fluid


Q. How can I determine date of manufacture for my DEF? A. DEF packaging shall have a date code on the product. The date code will give you the date it was manufactured. The first digit of the date code represents the batch number and the next 6 digits reflect the date that the batch was made and filled.

Q. What impact will exposure to high temperatures for an extended period of time have on DEF? A. While DEF exposure to constant, high storage temperature may have some impact on shelf life, this should not be a concern. Testing in hot climates has been conducted and has returned results concluding that DEF stored at a constant temperature of 86 deg F has a shelf life of 6 months.
So based upon the above information ... I found this bar code number on the box:

100 74804 03211 3

Which would insinuate 03/21/13 --- more than a year old DEF.

Well it hasn't happened again and if I can get it to use some of the product I'll try to put some newer dated DEF in it.

FajitaMidland 06-01-2014 10:32 PM

Re: Peak Blue DEF - Walmart
Looks like DEF could have a maximum shelf life of 2-years if stored properly...


Q. What is the shelf life of DEF?

A. The shelf life of DEF is a function of ambient storage temperature. DEF will degrade over time depending on temperature and exposure to sun light. Expectations for shelf life as defined by ISO Spec 22241-3 are the minimum expectations for shelf life when stored at constant temperatures. If stored between 10 and 90 deg F, shelf life will easily be one year. If the maximum temperature does not exceed approximately 75 deg F for an extended period of time, the shelf life will be two years.

GCOverland 06-01-2014 10:52 PM

Re: Peak Blue DEF - Walmart
This is also something I was thinking about a couple of weeks ago. During my first year of ownership, I'll probably won't be putting 10K (or more) miles on the diesel - so the question is: Do I actually want a full DEF-tank at delivery? The DEF might get too old before I would use the entire tank - so it might be safer to refill only small amounts like the 2.5 gal. Walmart is selling - and only put it in when the DEF-tank is getting almost empty. That would assure a fresher DEF at all times.

And it does get hot in Florida...

FajitaMidland 06-02-2014 07:16 AM

Re: Peak Blue DEF - Walmart
Yes - that does sound logical. My original thinking prior to my problem was to fill the tank up to 100% and then not have to worry about it for a period of time... that may have been a mistake since I live in Texas. I believe in the future I will keep at most a 1/2 tank in order to retain the good quality DEF in the tank.

philbytx 06-02-2014 10:29 AM

Re: Peak Blue DEF - Walmart
I too read the DEF storage article.

We just did an almost 4k road trip in April, our next is a 550 mile road trip in June, then a 2500 mile road trip in July and a 4200 mile road trip in September. After that, our next long trip will be a 4k miler but not until April/May of 2015.

So, on the way back from our 4k trip, I noticed the DEF tank showed less than 1/2 full, so I filled it up at a Pilot Truck stop.

My thinking was that after our 2014 trips, I would have the DEF tank down to about 1/3rd full by October of this year and would refill it just before our next long road trip in April/May of 2015.

A friend recommended that I fill up at busy truck stops with DEF, due to the high turnover:thumbsup:.

Hammerhead 06-02-2014 03:47 PM

Re: Peak Blue DEF - Walmart
I plan on keeping the DEF tank between 1/4 and 1/2 full, except I'll probably fill it up when we're heading out for a long vacation road trip. The DEF brand they sell at NAPA has the manufacture date printed on the bottle so you don't have to decode any production codes.

mtnmerlin 06-03-2014 10:27 AM

Re: Peak Blue DEF - Walmart
Like others in a hot climate, I need to have a plan for DEF. It was 111 degrees F (44 C) at my house yesterday. It was 92 degrees in the garage. I keep a couple gallon jugs of DEF in a refrigerator. I plan on adding a little DEF before trips to keep it reasonably fresh. My vehicle's current DEF level is about 20% and I plan on keeping it low through the summer.

FajitaMidland 06-04-2014 11:48 AM

Re: Peak Blue DEF - Walmart
I have learned that the Peak Blue DEF that is sold at many places and at Walmart has an ISO date stamp on the plastic container itself not on the box.

My number was: 11152440770

[ 1-2 ] Manufacturing Facility (i.e. 11)
[ 3-4 ] Year Manufactured+1 (i.e. 15 -1 = 2014)
[ 5-7 ] Days left in year (i.e. 244 or (i.e. May 1st, 2014)
Date calculator - Day Counter - How many days and/or weeks are there between two dates
[ 8-11 ] Batch code (i.e. 0770)

DEF Date Codes and API Certification - Diesel Forum -

1bluemcm 06-04-2014 01:46 PM

Re: Peak Blue DEF - Walmart
1 Attachment(s)
The same code has always been on the outside of the carton of all Peak BlueDEF I've bought - 4 jugs so far. It's just stamped on one of the sides over the printed material somewhere, have to look closely for it but it's there. So we can check manufacture date prior to purchase.

fun2drive 06-04-2014 04:24 PM

Re: Peak Blue DEF - Walmart
I just keep mine inside the AC'ed house in a dark cool area. I have no doubt that this will have a good service life. It really isn't much more than distilled water and small part of acetic acid.
I am not sure what causes the loss of acid strength guessing the heat kills potency...

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