kfp673
PA
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Joined: 12/12/2012
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Hello All,
2018 Ram 2500 6.4L Hemi with 4.10. Heading back from camping today, tow/haul mode on, after a long hill my truck suddenly left "D" and locked itself in 4th gear. I was on the highway doing about 65 so it was not that big of a deal, but I could not make it go back to D, upshift, downshift, nothing. Kept driving 2 miles until the next exit which happened to be mine. Seemed fine until I came to a light in town. It never left 4th. Needless to say it was not pretty trying to start from stop with 10k Lbs trailer in 4th gear. Got it going just to clear the intersection and pulled over where I could. Just as I pulled over a light said "Transmission is too hot". I let it idle for about 5 minutes hoping the trans cooler would cool it. After that 5 minutes the light went off but I was still stuck in 4th. Turned the truck off and re-started and all seemed fine for about 4 miles and then the same thing. I was about 10 miles from home thankfully so I limped home, shutting down and restarting at each light. Almost home the engine light went on. I am in warranty so I'll take it in this week but curious if anyone has seen this issue. Truck pulls the trailer great and never had an issue. It does scream sometimes pulling long hills but never felt like it was struggling. Also strange that when I re-start it shifts fine until it locks in 4th again after 5-10 min. Any thoughts? Thanks!
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C Schomer
Pueblo West, Co.
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Joined: 12/26/2000
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My only thought is... its good you have warranty!. So much for the ZF 8 spd and you have my sympathy… Really. It sounds very expensive, and hopefully only for FCA. Craig
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JRscooby
Indepmo
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I can't say why it would lock in forth, but bet the overheat was because of the converter friction starting the load in 4th.
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KD4UPL
Swoope, VA
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Well, the basics are:
Did you have enough fluid in it?
Do you service your transmission regularly including fluid and filter?
Do you have a transmission temperature gauge? What was it reading?
It could be a computer glitch, could be a trans problem, could be an actual overheat due to outside circumstances.
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bguy
The Rock
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That is a symptom of clutch pack failure. Shut down and restart can reset the system temporarily.
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2011 Ram 1500 Quad Cab, 4x4, 3.55, HEMI
2009 TL-32BHS Trail-Lite by R-Vision
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Grit dog
Black Diamond, WA
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KD4UPL wrote:Well, the basics are:
Did you have enough fluid in it?
Do you service your transmission regularly including fluid and filter?
Do you have a transmission temperature gauge? What was it reading?
It could be a computer glitch, could be a trans problem, could be an actual overheat due to outside circumstances.
Well the basics are no dipstick, 2018 truck not likely to need service unless it’s got over 60k miles (the 2500 HP8 interval I believe).
"Yes Sir, Oct 10 1888, Those poor school children froze to death in their tracks. They did not even find them until Spring. Especially hard hit were the ones who had to trek uphill to school both ways, with no shoes." -Bert A.
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goducks10
There
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C Schomer wrote:My only thought is... its good you have warranty!. So much for the ZF 8 spd and you have my sympathy… Really. It sounds very expensive, and hopefully only for FCA. Craig
2018 has the 68RFE
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4x4ord
Alberta
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Joined: 12/23/2010
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Is it low on fluid?
2017 F350 SRW Platinum short box 4x4.
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deltabravo
Spokane, WA
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How many miles on the truck?
I'm guessing that it doesn't have a trans temp gauge, since the OP never posted what the temperature was and only mentioned a dash light turning on.
2009 Silverado 3500HD Dually, D/A, CCLB 4x4 (bought new 8/30/09)
2009 Arctic Fox 811 (bought new 11/9/09)
2018 Timber Ridge 24RLS (bought pre-owned 3/12/20)
2008 Haulmark 8.5x20 toy box trailer
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rhagfo
Portland, OR
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KD4UPL wrote:Well, the basics are:
Did you have enough fluid in it?
Do you service your transmission regularly including fluid and filter?
Do you have a transmission temperature gauge? What was it reading?
It could be a computer glitch, could be a trans problem, could be an actual overheat due to outside circumstances.
Well depending on trim level for the instrument cluster the engine and trans temperature should be available on the instrument cluster.
If still under warranty should be somewhat low miles 2018 6.4 with 4.10's, 10,000# should be well within tow ratings.
Differently need a bit more information.
Weather when this happened?
OP states after long hill, how long, and how steep, how fast were you climbing?
Can and did you check trans and engine temp while climbing that hill?
Have you checked the trans fluid level since this happened, and is it correct?
Have you checked the engine coolant level?
Could be just a faulty sensor sending bad data to the management computer, or a slipping trans.
Russ & Paula the Beagle Belle.
2016 Ram Laramie 3500 Aisin DRW 4X4 Long bed.
2005 Copper Canyon 293 FWSLS, 32' GVWR 12,360#
"Visit and Enjoy Oregon State Parks"
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