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-   -   Cold Weather shifting issues (http://www.ramforumz.com/showthread.php?t=162163)

dano31 12-30-2013 10:26 PM

Cold Weather shifting issues
 
To start off I have a 2012 ram 1500, truck runs fine when its warm out and a bit chilly out but when it gets to be around -30 to -50 the truck does not shift properly. It will shift eventually but driving around town doing 60km/h my truck is reving at around 2300 rpm. It's starting to get hard on gas lol I read the other topic of buddies truck stuck in 4th, mine has no burning smell and it only does it when its cold so I'm lost. Would the tranny fluid be that thick that its causing shifting issues? Please help me

smurfs 12-30-2013 11:24 PM

Cold Weather shifting issues
 
theres a similar thread about this. it's the programming. I believe something to do with the fluid being so thick at that temp, it bungs things up and burns up torque convertors.

Edit: here's a quote from it:

"Starting in 2010 MY, we made a change to the transmission control logic / calibration, that delays the 2-3 upshift whenever ambient temp (not sump temp) is below -15°F (below -26°C).

The reason is to prevent torque converter failures (due to overheating) in the event that the trans oil cooler becomes "frozen" at low temps. Transmission fluid can become very thick at low temps, effectively blocking flow through the cooler. This then can lead to the converter overheating (due to lack of cooler flow). When we hold 2nd gear longer (by delaying the 2-3 upshift), it reduces the amount of slippage (and therefore, heat generation) in the converter, thereby avoiding the converter overheat.

In these trucks, the trans oil cooler is oil-to-air (it's not inside the radiator bottom tank), so as long as the ambient temp stays low, the cooler flow may remain restricted. That's why the 2-3 upshift delay is tied to the ambient temp, rather than the trans sump temp or engine coolant temp."

boomer 01-09-2014 12:17 PM

Good info smurfs, I am noticing the same thing in mine, wants to run higher rpms in town then normal in the cold, I was hoping it was a way to protect itself, and from what you said it seems like thats exactly what its doing. Thanks

Red-Stripe 01-09-2014 07:02 PM

The sad reality is that it's your $$ at the gas pump compensating for their engineering failure. They hope enough people don't notice it and think about it.

rvj 01-09-2014 07:08 PM

My 14 won't go into 6th till the engine warms up, then it does just fine.

Hornet 01-09-2014 09:35 PM

Here's the link to the whole thread Smurf's talking.
According to TransEngineer they're working on a fix for their mistake before it kills somebody.

Read the whole thread,it's eye opening

http://www.ramforumz.com/showthread.php?t=160191

Bighorn5.7 01-21-2014 12:22 PM

I had an 07 and was a little more slow to shift in the below zero temps. I now have a 14 with 175 miles on it and it does exactly what you are stating as it was -20 this morning. After reading this its what I figured and the computer is using ambient to decide how it operates. It does suck that its so lazy to shift and when it does its pretty firm. Feels like the father in laws old 95 Gmc sloppy 4 speed!


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