P0871 code and associated drama

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Fearfact

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Just wanted to post a run down of what the truck is doing and see what input is out there. The good thing is I have the max care warranty so everything should be covered.
2016 3500 crew cab/shortbed tradesman with 6.4 (non aisin) 4x4 approx 68000
This is a work truck and tows 12k+ pretty regularly
So I had a shift solenoid pack (I believe) go bad several months ago which was evident as it wasn’t downshifting properly-this was only real noticeable towing, coincidentally they had recently released a recall for this. Problem solved.
A few weeks ago it seems to be shifting off, lagging at time and hitting harder than normal at times so I contacted the dealer and slated the 60k service (doors was about 65k). They actually tried to save me the $ and said it was basically pointless since they had flushed it when the decal was done, I explained my concerns with shifting and they agreed it was worth a shot and would simplify a warranty claim if needed later.
Friday I was hailing one of our mini excavators (total load around 12000) and noticed it wasn’t downshifting when I was on longer grades regardless of throttle position, switching to manual did nothing- the numbers change but no actual shifting. The I get off the highway and into town, hit a stop light, then when trying to go it’s a bit slugging but nothing overly dramatic. Down hill-good, immediate steep grade and it is on its face in a high gear and won’t down shift. I went from 35-15 quick and luckily was able to turn of the road quickly. As I pull to a stop I get the trans temp high light, check the readings and it’s in the 180s but slowly starts climbing so I check fluids to see if it’s burned/low which it is neither. Let it sit a few and the light goes out and the temp stabilized around 200. I called the dealer service and spoke to the same guy I always deal with, he remembers the whole deal,history and my recent concerns. Time to move as I am basically blocking a small street, seems ok until the next incline when it repeats even worse, likely stuck in 4-5th, this time I was able to pull into a garage slot and drop the trailer so someone else can retrieve. Unhook and take off as it drives alright unloaded and get it to the house about a mile away. As I go to park it gets a CEL finally.
From what I have read this code seems to typically cause issues shifting up into the higher gears, hence why I made this post-let’s see what ol’ fiat/chrysler/dodge/ram can come up with this time!


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RamCares

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Hi Fearfact,

We know that at this time you are just sharing your experience for knowledge of the other forum members. However, if you do find you are in need of additional assistance while you are working with your dealer, please let us know. Just send us a private message with additional details.
Julie
Ram Social Care Specialist
 
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Fearfact

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Thank you, the dealer expedited the repair and I just picked it up. They feel the transmission valve body crapped out and were able to remove and replace it quickly I have only driven a couple of miles but atleast it is shifting properly and the manual shift works again...the real test is next time I have equipment in a trailer and make that little 6.4 work!


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Fearfact

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It’s been a week or two and some towing sprinkled in the mix. Everything seems to be good to go, today I dragged our kubota rs630 loader about 150 miles on highway and backroads, flats hills and mountains. Loader weighs about 11k (bucket and forks)plus the 14k tilt deck trailer so I assume around 13.5-14k
 

SYKRAMMAN

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Glad you finally got it fixed correctly. That’s a nice set up, good money maker.
 
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