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  #97  
Old 11-10-2014, 05:39 PM
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Re: New ECM/TCM flash coming out

I have the latest flash, new air filter.

I can get 30MPG easy on the highway between 55-60MPH, 28MPG at 70
around 50-55MPH around 35MPG

Only thing I noticed, the "diesel" sound is more pronounced when
you pull away from a stop for split second with the latest C & D flash.
Almost like a timing change.

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  #98  
Old 11-10-2014, 06:22 PM
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Re: New ECM/TCM flash coming out

Quote:
Originally Posted by crabman View Post
I logged in here because I have developed a poor economy and probably related regen issue. I have exact numbers for every tank of gas since new 1 year ago and my milage with my most recent tank is down by 5.96 miles per gallon versus my average driving in the exact same conditions over the last year. Along with this I've been getting a regen keep driving message every 2 or 3 times I drive the jeep now. Got me wondering if I'm experiencing some version of the same problems discussed here. Although my transmission shifting has never been bad and feels exactly the same now as it ever was. What also has me scratching my head a little bit is that with a near 6 mpg drop I would think I could notice a performance difference but this is not the case, feels exactly the same while driving. I suppose I'm going to have to see if I can pull any codes...
Are you checking mpg via the onboard computer or manually?
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Old 11-10-2014, 06:58 PM
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Re: New ECM/TCM flash coming out

Quote:
Originally Posted by nookie View Post

Only thing I noticed, the "diesel" sound is more pronounced when
you pull away from a stop for split second with the latest C & D flash.
Almost like a timing change.

The one thing I want more of from this motor - more sound. If it truly does make it louder, all the better.


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  #100  
Old 11-10-2014, 07:28 PM
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Re: New ECM/TCM flash coming out

Quote:
Originally Posted by crabman View Post
I logged in here because I have developed a poor economy and probably related regen issue. I have exact numbers for every tank of gas since new 1 year ago and my milage with my most recent tank is down by 5.96 miles per gallon versus my average driving in the exact same conditions over the last year. Along with this I've been getting a regen keep driving message every 2 or 3 times I drive the jeep now. Got me wondering if I'm experiencing some version of the same problems discussed here. Although my transmission shifting has never been bad and feels exactly the same now as it ever was. What also has me scratching my head a little bit is that with a near 6 mpg drop I would think I could notice a performance difference but this is not the case, feels exactly the same while driving. I suppose I'm going to have to see if I can pull any codes...
We haven't seen this yet and it may not be the case but it sounds like your DPF is not cleaning out completely from a regen. If it is partially clogged, you would see frequent regens and lower MPG's. 8 got a known bad tank of diesel about 6 months ago and mine regened frequently. 8 know because I watch the DPF temperature. I made sure I let it finish each time. I added Diesel Kleen and ran it to almost empty before refueling at my normal fillup spot (Shell). The new fuel immediately solved my problem.

If you don't drive at highway speeds frequently, you may want to start now.
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  #101  
Old 11-10-2014, 08:14 PM
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Re: New ECM/TCM flash coming out

Quote:
Originally Posted by SCMomentum View Post
Are you checking mpg via the onboard computer or manually?
Calculated manually at the pump, I keep track of it with an app on my phone. The number for my last tank is the lowest I have ever had by 4 some odd MPG. The previous worst was attained on winter blend in the snow...

Quote:
Originally Posted by ExcursionDiesel View Post
We haven't seen this yet and it may not be the case but it sounds like your DPF is not cleaning out completely from a regen. If it is partially clogged, you would see frequent regens and lower MPG's. 8 got a known bad tank of diesel about 6 months ago and mine regened frequently. 8 know because I watch the DPF temperature. I made sure I let it finish each time. I added Diesel Kleen and ran it to almost empty before refueling at my normal fillup spot (Shell). The new fuel immediately solved my problem.

If you don't drive at highway speeds frequently, you may want to start now.
My mileage is nearly always mixed with about 50/50 of both and I have seen the regen more in the last tank than I have for all the rest of the time I've owned the vehicle. Not kidding, I can only recall seeing the message a few times up till now.

Bad fuel had occurred to me and I have just filled up after going to slightly below empty (as low as I dared to go) to try and rule that out. I did purchase the fuel at my usual location which has never given me a bad tank going back a number of trucks ago but you never know.

At any rate there had been no mention of my particular symptoms in the thread but I thought maybe the hadn't came up since the thread was discussing the shifting, P20EE error code, cats and so on. I suppose this rules out that it has happened to others with the issues discussed here but hadn't come up in the context of the thread.
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  #102  
Old 11-10-2014, 08:41 PM
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Re: New ECM/TCM flash coming out

Crabman,

You might want to consider driving it hard for a few days. Accelerate harder and really build some heat in the exhaust. If your DPF is giving you regen warnings, your DPF is 80% full. These engines need the higher EGT to function. Short drives are not healthy for the DPF.
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  #103  
Old 11-14-2014, 08:28 AM
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Re: New ECM/TCM flash coming out

Any updates on tcm changes to come? Had this update done on my 2014 a couple of weeks ago and just took our first highway trip. Trip was a little over 100 miles each way. While I don't have hard numbers, I watched the evic real time and avg on the way back. The mileage was definitely off from before the tcm update. I would get low to mid 30's (32-34mpg) on the highway avg 70mph. Now I would say I am getting 28-30mpg on the highway at 70mph. Low rpm 8th gear driving is still great mpg wise. 40-45mph in 8th gear shows 35-40mpg on the real time evic. I never had the trans shudder but only at 6200 miles so far. I hope Jeep brings back my highway mileage.

First post but been lurking since purchase in May. Thanks for the great info.
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  #104  
Old 11-14-2014, 12:11 PM
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Re: New ECM/TCM flash coming out

My son who drives far more city miles and always uses an idle to warm up the vehicle when it is cold is starting to get a CEL and has seen a few Regen messages. I drive probably +90% highway at mostly a moderate speed to maximize MPG. I keep a log of MPG based upon fill up and mileage. I have been getting a little better than average these last few weeks. Good fuel or ideal temps I do not know. No regens or CEL yet on my vehicle even after almost 25K. I am getting it checked for 20K a little late obviously but if their is any updates done I wills see a change in MPG after the first tank. I probably will fill up prior to getting it worked on. Maybe after.

I do see a drop in MPG with changes in temperature. And a significant change when the fuel changes for sure. I am guessing that problems with emissions are fewer among those of us who drive a good amount of highway miles and very few short trips or stop and go driving. I will see what happens when my son gets his CEL checked.

I only get the shudder when I come to a stop sign a little bit faster than normal and try to slow down quickly. A few times I even looked to see if someone ran into my bumper the thump was so strong. I do not get it on the highway or country roads I drive.
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  #105  
Old 11-27-2014, 09:02 PM
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Re: New ECM/TCM flash coming out

Quote:
Originally Posted by TheHangingJudge View Post
Any updates on tcm changes to come? Had this update done on my 2014 a couple of weeks ago and just took our first highway trip. Trip was a little over 100 miles each way. While I don't have hard numbers, I watched the evic real time and avg on the way back. The mileage was definitely off from before the tcm update. I would get low to mid 30's (32-34mpg) on the highway avg 70mph. Now I would say I am getting 28-30mpg on the highway at 70mph. Low rpm 8th gear driving is still great mpg wise. 40-45mph in 8th gear shows 35-40mpg on the real time evic. I never had the trans shudder but only at 6200 miles so far. I hope Jeep brings back my highway mileage.

First post but been lurking since purchase in May. Thanks for the great info.
Call jeep and open up a complaint with them like I have. They are not aware of the issue unless we call and complain. I am suppose to get a call back from them on Monday but they were not aware of this mpg drop when I called a week ago. They are hopefully going to issue the oem flash to my dealership so they can reinstall it but I'm not holding my breath. I saw a 5mpg drop after this TSB and am regretting having it done.
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  #106  
Old 12-21-2014, 07:55 PM
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Has anyone got a fix for this as I got the transmission update and my millage is horrible now
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  #107  
Old 12-21-2014, 10:37 PM
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Re: New ECM/TCM flash coming out

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Originally Posted by Matt18 View Post
Has anyone got a fix for this as I got the transmission update and my millage is horrible now
I was about to inquire about that myself. Given the reports of decreased mileage on this "fix", perhaps someone should create a poll.

My transmission still clunks on 5 to 4 after decelerating from driving at interstate speeds for a few hundred miles, but I have no interest in making my mileage even worse.
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  #108  
Old 12-22-2014, 11:45 AM
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Re: New ECM/TCM flash coming out

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Originally Posted by Cmweed View Post
Call jeep and open up a complaint with them like I have. They are not aware of the issue unless we call and complain. I am suppose to get a call back from them on Monday but they were not aware of this mpg drop when I called a week ago. They are hopefully going to issue the oem flash to my dealership so they can reinstall it but I'm not holding my breath. I saw a 5mpg drop after this TSB and am regretting having it done.


How were you getting low 30's before? Even if 4x2, best is 30. I think the "fix" also fixed the inaccurate mpg numbers you were getting before.



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