15' PW 1500 RPM Stumble

[snuffy]

well i have the same thing on my 2015 with 9000mi. so i took truck in for airbag recall and told them about the stumble too. they say that it has DTC CODE PO944 needs new regulator valve in trans and they have to pull trans to replace..any thoughts on this?

[pcpro15]

well i have the same thing on my 2015 with 9000mi. so i took truck in for airbag recall and told them about the stumble too. they say that it has DTC CODE PO944 needs new regulator valve in trans and they have to pull trans to replace..any thoughts on this?

Mine isn't throwing a DTC, but was much better after the reflash. There is still a touch there, but no where near what was there originally. With 9k, you should still be under warranty so I would let them fix it for free.

[pcpro15]

Just wanted to update that the original hesitation that I felt is very minor between 1100-1500rpm, although a new major hesitation has hit me twice within the past two weeks. I've experienced this while driving and kicking down the transmission to pass. It literally feels as if someone were to grab you and move you forward and backward as the truck loses and regains power. First time I thought it may have been traction control, but the second time it happened I confirmed no traction light flashing. No DTCs, no nothing.... Just feels like Power.... / no power/ power/no power / power / no power / power in like 1/2 second pulses. Already passed 10K miles, so I can't blame it on breaking in anymore either. Back to the dealer for more updates I guess

[olyelr]

Ugh. Best of luck, keep us posted....

[nts007]

I've had this happen in my 93 stealth when I had the fueling maps completely screwed up. If anything I would look into the map and Maf sensors and the iat. It sounds like your truck is seeing false readings under throttle and cutting spark and fuel just killing the timing. How you explain the felling you have is identical to what mine was and it was over fuelling because of a bad input though the sensors. Pulling the Maf/map (mass air flow/manifold absolute pressure) sensors and looking at their bulbs for crud or garbage and cleaning them with a sensor safe cleaner and also the iat (intake air temp) as well. You could spend months chasing a problem and replace everything and be ready to just throw the truck off a cliff to find out there was a piece of sludge blocking a sensor. And it wouldn't throw a code of they are working the majority of the time.

[Sweet5ltr]

Update @ 23,000 miles;

Still stumbles/bucks/sluggish if not in tow-haul mode unless driving 55+MPH. Although nowhere near as frequently or as violent.
Solution - TOW/HAUL MODE after vehicle start up and I've been fueling at the same 'highly active' fuel stations for 20k miles (always running 87, absolutely no difference with 89/93/and even tried a 87-93 manual mix).
Thoughts - It does drive better now, to the point where I don't notice it, but I often only drive in tow/haul mode anymore until I get up to a max cruising speed. That seems to be the only way to not experience this abnormal phenomenon.

This truck just doesn't drive very well under 1,500 RPM and runs especially rough when cold. It bucks, hesitates, and honestly, just feels like the fuel/timing map at lower engine speeds is not adapted to lugging around a 7,000 (base) vehicle. Who knows, it could even be the transfer case unlocking from the front axle, MDS, I mean, there are too many gears in motion to determine the actual cause by the standard end user. Too bad there are no easy solutions here, other than an aftermarket ECU and tuner. There is no significant change in fuel economy driving in tow/haul mode, this truck has practically always given me around 11.5-12.0 MPG since new, regardless of how I apply the throttle or what speeds I drive. The best i've ever had was around 14 MPG on the interstate with the factory 33's. My wife and I love it, it is my -forever- vehicle and is like a member of the family. Currently looking to possibly get an overland bed rack fabricated, similar to AEV's concept. Also ordering a lifetime warranty ASAP, I couldn't imagine the wiring harness replacement on this in 10-15 years. I want to off-road responsibly, and not worry about parts breakage and tracking down new axles or sensory wires on such a limited production vehicle.

[nts007]

Have you checked fuel pump???

[Sweet5ltr]

Not the fuel pump, it's electric so the problem would fluctuate with all-RPM's if it was an actual fuel pressure/filter/regulator problem. Not sure if you've read it so far, only does it filling up at certain fuel stations (relatively low-utilized, possibly more moisture or ethanol in fuel? Tune doesn't like something, same results 10+ times to verify) and if running out of tow-haul mode at slow speeds, high load, and low-throttle positions (pointing to throttle position/fuel trim/timing mapping) it will throw a small 'fit' sometimes. Other people have stated the identical problem under this scenario, which to me points to the tune. Even with a lifetime warranty, would only take it into the dealer with major parts breakage, they know little-to-nothing, especially concerning this HD 6.4 which is very limited production.

[nts007]

I was just reflecting on the fuel pump failures I went through on the wife's jeep. It was intermittent and wouldn't be an issue under throttle at first but at cruising it would just lurch the jeep sometimes and it would get progressively worse at lower rpm to the point where it would just shut off instantly. Computer would kill it. I have read from the start and I'm just trying to see what other possibilities it could be. If it's just the computer then It would just need a reflash. But it could also be bad itself. There is too many moving parts in this system...

[DamageWagon]

I got bad fuel once on our 3300 mile trip we just did. It was when I got premium gas at a gas station in rural southeastern Idaho with a low income and a big difference between gas grade prices. It all made sense when my truck didn't have nearly the power or efficiency as soon as we started going again. It never stuttered or anything though. I've heard of your problem several times, I really think it's something computer mapping related like you said. You might want to call Chrysler. They do have individuals that are sent out to investigate problem trucks to examine what might affect the fleet. You will have a hard time getting one, but if the dealer repeatedly cannot fix your problem they might help you.


Sent from my safe space

[Zybane]

Not the fuel pump, it's electric so the problem would fluctuate with all-RPM's if it was an actual fuel pressure/filter/regulator problem. Not sure if you've read it so far, only does it filling up at certain fuel stations (relatively low-utilized, possibly more moisture or ethanol in fuel? Tune doesn't like something, same results 10+ times to verify) and if running out of tow-haul mode at slow speeds, high load, and low-throttle positions (pointing to throttle position/fuel trim/timing mapping) it will throw a small 'fit' sometimes. Other people have stated the identical problem under this scenario, which to me points to the tune. Even with a lifetime warranty, would only take it into the dealer with major parts breakage, they know little-to-nothing, especially concerning this HD 6.4 which is very limited production.

Sweet, over Christmas my transmission valve body failed and had it replaced. At that time, they also updated the software on the engine and transmission computers. So far since then, I haven't had the stumble problem that I've had many times before. Going to the dealer to get all the latest updates may be worth the trip. Well of course unless you already did.

[Sweet5ltr]

No I haven't done that already, but I will have them perform a software update during the next oil change, thank you for relaying that info to me.

Seems like a similar problem?
http://www.ramforum.com/f158/2016_6_4_h ... ng-100063/

[DamageWagon]

Wait you haven't done a software update!? I thought you said you did that? That's step one, I wouldn't bother with anything else until you discuss the issue with the dealer and see if they have an update.


Sent from my safe space

[olyelr]

Out at work today I saw a newer 6.4 2500 (not a PW) slowly drive by, up an incline, and could actually hear his truck doing the low speed shutter issue, kind of like it was hunting for a different gear in a way... so its not just PW related.

[Sweet5ltr]

Wait you haven't done a software update!? I thought you said you did that? That's step one, I wouldn't bother with anything else until you discuss the issue with the dealer and see if they have an update.


Sent from my safe space

Issue rarely comes up anymore as I place the truck in tow/haul 99% of the time. It's definitely an issue with the tune, the dealerships never notified me an update was available and haven't been on the forum in awhile. I'll be sure to ask about it next go around, in 3k miles.

[Sweet5ltr]

Out at work today I saw a newer 6.4 2500 (not a PW) slowly drive by, up an incline, and could actually hear his truck doing the low speed shutter issue, kind of like it was hunting for a different gear in a way... so it's not just PW related.

Yes on the ram forums this issue is widespread with the 6.4's, seems like everyone has been doing the same thing, placing the truck in tow/haul mode. If the new software update cures my issue then I will for sure post a thread over their.

[olyelr]

What i dont like about tow/haul mode is the trans wont go into 6th gear. And the downshifts When stopping gets old too.

[Sweet5ltr]

What i dont like about tow/haul mode is the trans wont go into 6th gear. And the downshifts When stopping gets old too.

I shift out of tow/haul mode at 45+ MPH. 1/2 city & 1/2 highway driving for me every day, max speed limit on my commute is 55 MPH for 6-7 miles. Of course it would be nice if I didn't have to rely on tow/haul mode for daily driving, definitely getting the updates.

[olyelr]

What i dont like about tow/haul mode is the trans wont go into 6th gear. And the downshifts When stopping gets old too.

I shift out of tow/haul mode at 45+ MPH. 1/2 city & 1/2 highway driving for me every day, max speed limit on my commute is 55 MPH for 6-7 miles. Of course it would be nice if I didn't have to rely on tow/haul mode for daily driving, definitely getting the updates.

Gotchya, yeah thats a pretty good way of doing it.

FWIW, my dealer did a software update on my truck when they replaced the battery (it was completely shot ) and nothing changed for my truck as far as this stumble goes. Let us know how your update works out!

[Zybane]

Ya, I hope it isn't just chance/luck that the stumble hasn't happened to me since the computer updates. I had them BAD. Whole freaking truck would buck fore and aft. I also never bother with Tow mode unless I am towing.

[Sweet5ltr]

Ya, I hope it isn't just chance/luck that the stumble hasn't happened to me since the computer updates. I had them BAD. Whole freaking truck would buck fore and aft. I also never bother with Tow mode unless I am towing.

My wife and I both carpool/work on base and I was talking to her about it this morning, as she drives it just as much as I do. The problem has definitely cleared up over the past year, when we first bought it, the whole truck would buck back and forth, actually jerk the driver/passengers around. What is also strange, is the fact that the truck used to have a mechanical knock as well from the transfer case - front diff area; you could feel it in the floorboard/accelerator pedal, possibly from disconnecting/reconnecting on the fly. Now, nothing, everything has cleared up as parts have broken in. Stumble is very slight now, and a complete 180 from how it felt before. This truck has definitely gotten better over time, most posts I see are from new owners, and I can definitely feel their frustration after paying 50-60k.

[pcpro15]

Just had my truck in for the trans solenoid recall... and while I was in there they mentioned the EGR recall. I mentioned that I looked it up online and did not see that recall under my truck, but if it was applicable to take care of it while it was in the shop. Picked up the truck and between the two updates it felt different in a good way. It has only been a few days, and have not noticed the bucking I used to so far. I previously dismissed the EGR posts because again it didn't show online as my truck being affected. Anyway I did some searching tonight and this post mentioned it resolved their issue as well. http://www.ramforumz.com/showthread.php?t=229008

Call your local dealer and check for open EGR recall if you are still having problems. I can't find the TSB, but the number below should help them.

"Performed RRT 16-096 -Inspected the EGR valve serial numer, and replaced the EGR valve, road tested ok"

[joeschmidt]

Might be a crazy question... but how does one know if they need a software update?? And how to do it? Asking for a friend

[waldo]

Call your local dealer and check for open EGR recall if you are still having problems. I can't find the TSB, but the number below should help them.

"Performed RRT 16-096 -Inspected the EGR valve serial numer, and replaced the EGR valve, road tested ok"

When they changed the EGR valve on my 16 is was a TSB, not a recall. It somehow caused my trans to not want to upshift out of second for a while and that's what they decided caused it. I haven't had it back to the mountains yet to see if it helped the low (1200) rpm lope it had while climbing up hills around 15 mph. It acted like how a motor with a big cam acts at low rpm.

[NickTF]

I wonder if any of these apply to 2015s. Mine has the recall for the side air bags, i've yet to complete it. Guess I may need to bit the bullet and do so. I hate to give the truck to anyone considering my experience is that you're not certain to get the truck back in as good a condition as you gave it to them and it's such a damn hassle to get anything addressed if that's the situation.