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  #13  
Old 03-19-2014, 07:26 AM
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DEF = Diesel Exhaust Fluid

DPF = Diesel Particulate Filter.

US models have both but the Aussie system is also tuned differently and does not have DEF to meet the different emissions specs.

I should also mention that the DPF have been on the trucks here in the US already for years. I could be wrong but diesel girl's description doesn't include a bunch of highway driving and still no regen.
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Old 03-19-2014, 10:27 PM
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Re: 2014 Grand Cherokee Diesel

You are right, I saw the bit about driving to and from the city, but missed the next bit, that she has had the regen message occurring...

Still a bit strange that she says it did a regen the previous week, but then went into limp mode a week later. Although it isn't clear if she did drive it continually until it cleared at that point.

Maybe the dealer can pull some messages off it that match the TSB.
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Old 03-20-2014, 06:02 AM
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Re: 2014 Grand Cherokee Diesel

Yes, it is the 30 Miles (50 km) per week that concerns me, I am sure it is Regenerating more than average but even in New Mexico this time of year, it may not reach optimal temperature all the time...

To the OP, I would say that it will likely be less of an issue when it gets warmer, and no you do not need to drive different than you do. The most important thing is that when the Regeneration message comes up ** Especially when it gives the nearing full message** as soon as it is safe and reasonable to do so, drive it. For best fastest results, driving around 55MPH as consistently as possible works very well. It will Regen at 45-50 but it takes a little longer and you will likely notice it is using a little more fuel.

I am aware of the Regeneration issues that have happened in OZ, but I honestly believe that the driving habits the vehicle is in is simply going to mean that this regen warning will come up more often for you. On the flip side, that little annoyance which likely will actually get better with some time you won't be so worried about when you see what a magnificent hauling machine the Grand Cherokee is.
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Old 03-20-2014, 08:38 PM
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Re: 2014 Grand Cherokee Diesel

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Originally Posted by Willx View Post
I am aware of the Regeneration issues that have happened in OZ....
Sorry to stray a little off topic here, but do you have any info on the cause of the problems we've seen in Oz or the TSB fix (tsb_wk2_1801814) for it? I'd be interested to understand why it was failing.... I'm guessing bad sensor input or something.
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Old 03-20-2014, 09:14 PM
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For the record, NAFTA EcoDiesels don't show a message under the "normal" regen operation. The only sign is that the exhaust temperature rises to 1200F. This is only visible using an ODBII monitoring device such as a ScanGuage II or Torque app. There are 2 sensors visible via ODBII....Exhaust Gas Temperature (nearer the manifold and turbo) and Catalyst Temperature (near the DPF). Both show 1200F or higher. As mentioned, the highest temps I've observed are at 50-55mph under light loads but not downhill.

I have never seen a DPF message in 11k miles but I drive 30k+ per year on the highway. I have witnessed high EGTs on the highway lasting 20 minutes on several occasions. Apparently, if the stealth regen doesn't happen, the DPF gets full and warning messages appear.
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Old 03-20-2014, 09:47 PM
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Re: 2014 Grand Cherokee Diesel

Quote:
Originally Posted by ExcursionDiesel View Post
For the record, NAFTA EcoDiesels don't show a message under the "normal" regen operation
Ok, sounds like the exports are a bit different in that way.
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Old 03-21-2014, 05:20 AM
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Re: 2014 Grand Cherokee Diesel

Quote:
Originally Posted by Benn0 View Post
Ok, sounds like the exports are a bit different in that way.
Excursion is correct in his assessment, but I will see if I have any more info on the OZ issues. I have seen mine go into requested Regen 4 times total in about 7000 Miles, and all 4 times I can 100% say my driving habits of the preceding days caused it.

Maybe worth while posting my WiTech data, just so you can see how many Regens these thing go through for regular operation. I will probably be able to poll that today.
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Old 03-21-2014, 07:11 AM
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Re: 2014 Grand Cherokee Diesel

Every chance I get I drive it when the message says nearing full. The first and only time it went into limp mode it gave me no time to drive. I left work and headed straight to the dealership and I lost power on my 3 mile drive down to the dealership. Also I don't know if this is any correlation but I need an oil change at 2700 miles. I'm not sure if I really do or not.
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Old 03-22-2014, 09:57 PM
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Yes you do.

Cold starts and short drives make for very low oil life expectancy. Even a gasser should have the oil change more often when short tripping like that.

As for the limp mode, it is possible there was an issue in the beginning... I had a MIL a couple of times that actually resolved itself (something to do with lubricant and resistance in the throttle plate) just to be sure you have not had the limp mode ever since correct?
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Old 03-22-2014, 10:38 PM
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Re: 2014 Grand Cherokee Diesel

No limp mode in over 1000 miles. We just got back from a 300 mile round trip and my overall MPG went up tremendously and she rode great. I'm hoping maybe there was just a large particulate in the filter messing with the systems. Fingers crossed!
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Old 03-24-2014, 07:13 PM
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Re: 2014 Grand Cherokee Diesel

Quote:
Originally Posted by Willx View Post
Excursion is correct in his assessment, but I will see if I have any more info on the OZ issues. I have seen mine go into requested Regen 4 times total in about 7000 Miles, and all 4 times I can 100% say my driving habits of the preceding days caused it.

Maybe worth while posting my WiTech data, just so you can see how many Regens these thing go through for regular operation. I will probably be able to poll that today.
Ok, it seems that TSB isn't being applied in Oz, so perhaps it isn't related to our problem here. Perhaps it might apply to diesel girl, though I have no idea what it fixes, other than the codes listed.....

But anything else you hear about the Oz issue would be great. Some are now saying they have been told by dealers their dpfs weren't installed correctly and need to be replaced. Maybe just on the export line....
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Old 04-18-2014, 09:02 AM
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Re: 2014 Grand Cherokee Diesel

Just a comment in my experience for comparison.

I drive 70 miles per day, nearly all highway. 35 morning and night.

Have had the JGC Ecodiesel since last November.

I have never seen a regen or dpf related message ever.

I drove 10,300 miles to get the oil change indicator from new down to 3%.

This vehicle loves the highway!


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