Technical Service Bulletin in Oct. 2016 TSB # 08-082-16 ITBM

[SnoKing]

Well guess what??? I created throttle delay the other day pulling out of the park onto Hwy 60. Time to file a complaint on safercar.gov. SNOKING

 

[RVTRKN]

If you trusted the engineers enough to buy the truck, why would you not trust them to fix issues that they have found over time with vehicles in actual use?

I in particular wanted the ITBM update. Also under certain conditions I had the Aisin hunt between 1 and 2nd gear when rolling through a stop sign. Also had a bit of a lope going real slow through RV Resort up North. Will not know if that has changed unit we get back there in 6 weeks or so.

SNOKING

Well it isn't always the engineers at fault, sometimes it just doesn't download properly like what happened to my 07 C&C, and when It goes into regen (long story) back in 09. It was brought to my attention that a flash was available to help in regen strategy, that Cummins engineers were enhancing due to lessons learned. I've been trying to get rid of it ever since and so far I've thrown $4K at it, and still counting.*

 

[TCollier]

Less than desired shift quality during 6-5, 5-4 coasting downshifts.

^^ This is the one I'm interested in. I don't think I've had any of the other.

 

[RVTRKN]

Well guess what??? I created throttle delay the other day pulling out of the park onto Hwy 60. Time to file a complaint on safercar.gov. SNOKING

I found that the delay happens when you start to accelerate then have to pause for a second then get on it again, with the 2014.

 

[SnoKing]

I found that the delay happens when you start to accelerate then have to pause for a second then get on it again, with the 2014.

That has always been the case. I however have not experienced it very often. In the recent case it was quite noticeable. Not sure if it changed a bit because of the re-flashes.

 

[Flash1034]

Any updates after the updated flash?

 

[SnoKing]

I towed today for Gold Canyon to Kingman, AZ, 235 miles of rolling hills and a big gain in elevation.

And guess what??? No more hunting between 5 and 4 on hills. It comes to a hill, pulls a while in 5th and then drops to 4th and after cresting the top it shifts back to 5th. Before it would hunt between 5 and 4 on hills.

 

[RClark]

My brake controller works fine. Always able to start when hoked up. The only time I had brake problems on starting was when the trailer batteries were too low to work the electrohydraulic motor. Driving a few miles charged them enough.

 

[SnoKing]

Well today the cruise control/transmission kickdown went stupid again after hours on the road. It happen last fall in the same area coming down. It is either altitude or truck in regen.

I will be running along at 60 on cruise control and come to a grade and it slows to 57 before down shifting and going back to 60. Boost meter shows that it is not building boost in 5th as this is happen. We were around 6000 feet when this started. Tomorrow we will have similar roads tomorrow North of Ely on 93. SNOKING

 

[RVTRKN]

The main issue I had with my 2014 2500, the RPM's always wanted to run real low, and I had to paddle shift it until around 70MPH. I never towed with it but, the truck weighed in at 10,000 pounds with the service bed and tools. Try paddle shifting and keep RPM's @1500 and see how it performs. A lot of the issues are the 3:42 rear diff which keeps the CTD RPM's below it optimum performance. 1700 to 1900 is the best for my 07 6.7.

 

[SnoKing]

The main issue I had with my 2014 2500, the RPM's always wanted to run real low, and I had to paddle shift it until around 70MPH. I never towed with it but, the truck weighed in at 10,000 pounds with the service bed and tools. Try paddle shifting and keep RPM's @1500 and see how it performs. A lot of the issues are the 3:42 rear diff which keeps the CTD RPM's below it optimum performance. 1700 to 1900 is the best for my 07 6.7.

It perform perfectly the day before at lower elevation on the way from East Valley of Phoenix up to Kingman, worked fine until about a hour out of Ely and going over 5-6K elevation and hours on the road. Will see what happens tomorrow. Again it did the same thing last fall in the same area, which makes me believe it is an elevation issue.

SNOKING

 

[kthaxton]

Well today the cruise control/transmission kickdown went stupid again after hours on the road. It happen last fall in the same area coming down. It is either altitude or truck in regen.

I will be running along at 60 on cruise control and come to a grade and it slows to 57 before down shifting and going back to 60. Boost meter shows that it is not building boost in 5th as this is happen. We were around 6000 feet when this started. Tomorrow we will have similar roads tomorrow North of Ely on 93. SNOKING

Sounds similar to an issue I have intermittently for which I have never found a solution....but it doesn't happen as frequently as it used to....but it is still more prevalent in the summer months.

https://www.turbodieselregister.com/threads/252405-2015-down-on-power

Ignore where I mention the exhaust brake having intermittent issues, I now understand that to be just scenarios where my TC wasn't locked up, therefore unrelated to my boost-sticking issue.

 

[SnoKing]

Sounds similar to an issue I have intermittently for which I have never found a solution....but it doesn't happen as frequently as it used to....but it is still more prevalent in the summer months.

https://www.turbodieselregister.com/threads/252405-2015-down-on-power

Ignore where I mention the exhaust brake having intermittent issues, I now understand that to be just scenarios where my TC wasn't locked up, therefore unrelated to my boost-sticking issue.

It does sound like the same condition. And I see you live at 5600 feet. I have been in the high country of Nevada each time I have had the problem. However the Stanton , Tx guy is at a lower elevation and claiming the same issue. I wonder if he has higher elevation in his area or travels to higher elevations. Is the MAP sensor the only one that measure air pressure?

your 68rfe and my Aisin kind of rule out the transmission, I will watch boost again today, as that seems to be the route cause. Chris

 

[kthaxton]

I will watch boost again today, as that seems to be the route cause. Chris

That is what I have concluded also....boost seems to "stick" around 7-10 psi when it would normally be in the mid-teens on this particular stretch of highway.
It is a strange thing, there is no rime or reason for it when it does happen the only thing remotely consistent is that it happens more often in the warmer months....but not exclusively.

 

[SnoKing]

Here are some conclusions from today run. It seems to be altitude and speed/RPM related. In the high country of Nevada(6000+) at 60 MPH is did it regularly. I sped up to 61 and it was better, at 62 it never happen. I was back down to lower altitude on I-84 3500-3600 feet and ran 60 for a while and it did not occur.

Now for the back news of the day, and I will start another thread on it. About 10-15 miles South of Wells, Nv, AKA middle of nowhere, I go a check engine light. At Wells I read codes and had a P249E. Talked to Assist (No help) and called the RAM dealer 114 miles North on our route. We made the decision to push on to the dealer. They read the codes and found the same code I did and said it was related to the DEF reduction pump. They were a week out and looking at it deeper with a tech. So they reset it and sent us on our way. Now I have to go do my research. SNOKING

 

[kthaxton]

Here are some conclusions from today run. It seems to be altitude and speed/RPM related. In the high country of Nevada(6000+) at 60 MPH is did it regularly. I sped up to 61 and it was better, at 62 it never happen. I was back down to lower altitude on I-84 3500-3600 feet and ran 60 for a while and it did not occur.

Details are good, obviously, but I wouldn't put too much value on these findings (assuming your problem is the same as mine) because mine is intermittent on the very same stretch of highway I drive every day. I could go weeks or months without it doing it, then it could happen multiple times every day for a week or so then stop. All on the same stretch of highway and under the same conditions.

 

[SnoKing]

Details are good, obviously, but I wouldn't put too much value on these findings (assuming your problem is the same as mine) because mine is intermittent on the very same stretch of highway I drive every day. I could go weeks or months without it doing it, then it could happen multiple times every day for a week or so then stop. All on the same stretch of highway and under the same conditions.

And your speed is always the same? Next time it is happening, speed up a bit. Driving most of the day I was able to try different speeds and obtain the results noted above. Today I will again we driving 250 miles at 3500-4500 feet, so will get to test theories some more.
That is providing the P249E thing does not put me on the side of the road. SNOKING

 

[kthaxton]

And your speed is always the same? Next time it is happening, speed up a bit. Driving most of the day I was able to try different speeds and obtain the results noted above. Today I will again we driving 250 miles at 3500-4500 feet, so will get to test theories some more.
That is providing the P249E thing does not put me on the side of the road. SNOKING

Yes, same speed usually because it is much more obvious to me when I am using cruise control....Which reminds me, last year it did it while I was towing on I-80 (across Nevada coincidentally), I found that sometimes, I could blip the throttle and that would wake it up (so to speak), but it may have simply been because this disengaged the TC momentarily and caused the RPM's to raise (raising the RPM's seems to get the boost up in these situations). It also made me think that it could possibly be "noise" or wear in the throttle position sensor at the pedal or something it its circuitry/programming that is hiccupping and not letting the PCM know to increase "throttle" as the truck slows down.

 

[Newsa]

It does sound like the same condition. And I see you live at 5600 feet. I have been in the high country of Nevada each time I have had the problem. However the Stanton , Tx guy is at a lower elevation and claiming the same issue. I wonder if he has higher elevation in his area or travels to higher elevations. Is the MAP sensor the only one that measure air pressure?

your 68rfe and my Aisin kind of rule out the transmission, I will watch boost again today, as that seems to be the route cause. Chris

Just like water boils more readily at high altitudes, it will also evaporate faster at high altitudes. However, if the P249E goes away when you hit lower altitudes, then it isn't a def quality issue (evaporated H2O), and it's not a def injector. I occasionally (once every 1-2 years) add a pint of reagent grade deionized water to my def because the water wull evaporate leaving higher concentration of def in my tank. Wondering if the stanton texas guy has hot temps causing water to evaporate out of def? If it (P249E) goes away at lower altitudes, maybe you have just identified a high altitude hiccup that happens with your truck?

 

[SnoKing]

Well we travel over 300 miles today at 60 MPH and max altitude of around 4200 and never had the cruise control/boost issue.

And P249E did not raise it's yugly head again.

SNOKING