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Desertryder

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Discussion starter · #1 ·
Greetings, I have a 2017 Durango SXT 3.6, 8 spd trans. My trans won't hold a hill. When I take my foot off the brake pedal it's like it's in neutral and rolls back. It's still under warranty so naturally I take it to the dealer.
They keep it for two days and tell me it's "working as designed at this time." The service manager tells me this is normal for the year and design of my vehicle. I promptly ask him and everyone else in the office how long
everyone has driven/ owned a vehicle with an automatic trans. and have they EVER had one not hold a hill that was operating properly. I get the deer in the headlight look. Sooo they came to the conclusion that the module
needs to be set back to 0 so the trans can re-learn. I was told to re-learn it for 500 miles. I'm throwing the BS flag. I was wondering if anyone else has had this issue and what the REAL diagnosis was.
 
#2 ·
IIRC the DD have hill descent and that is supposed to hold the DD without moving until you hit the gas. My 2011 has it and the 2011 Dodge Ram I had before the DD had it. I would guess that this feature is not working in your DD.
 
#3 · (Edited)
Add one more deer to those headlights, because I never knew of any transmission designed to hold the vehicle on a set incline, outside of some CVT's (continuously variable transmissions), which the ZF8 ain't. The ZF8, like all other 'normal' automatics, just doesn't work like that to my admittedly lacking knowledge.
And on a forward incline, none that applies any type of "brake" that I know of.
Vehicles will sometimes "hold position" on a slight incline at idle due to hydraulic pressure from the torque converter being strong enough to overcome the vehicle's weight --- but there is no formula that I'm aware of to calculate what that is.
Of course, the stronger the converter's torque can transfer to the drive train in relationship to the vehicle weight, would be all that can determine the angle the vehicle can remain stationary.
If you remove the brake on a level surface, most (not all) vehicles will begin to move forward.
CVT's, or "shiftless transmissions" are not designed with specific "speed" gearing, and often will hold on a much steeper incline but even so, at some point, the incline angle will become too steep to hold the vehicle sooner or later.
 
#4 · (Edited)
It's not the transmission that does that it's the anti-lock braking system.

The vehicle senses it's sitting at an incline and, when you apply the brake, it maintains the brake pressure until it senses the gas pedal being depressed. In my experience, it works fine except maybe on steep inclines. It will not work if, for instance, you're in traffic on a hill, you creep forward and the vehicle coasts to a stop, it won't then apply the brakes for you to keep you from rolling back. There are many circumstances where it might not behave as you expect. Try being a little more analytical about it in order to figure out if there's some pattern as to when it works or when it doesn't. With that in hand you can go to your dealer with more specific information or you may learn that it's actually working and you just didn't understand the system's limitations.

It's like the adaptive cruise control. I thought it wasn't working after two or three times it didn't apply the brakes as I came upon stopped traffic. Come to find out the system ignores stopped traffic as it can't distinguish that from, say, a road sign or other fixed landscape feature. I looked in the owners manual (gasp!) and sure engine, it said that's how it worked.

These new cars have complex systems and people really need to be trained at least a little so that they know what the limitations are before they run out and kill themselves or someone else.
 
#6 ·
attached some pages from the owner's manual.

Make sure hill start isn't disabled in your settings -> safety and driving assistance.

Old-school automatics would 'hold' (or creep, on level ground) due to force thru the torque converter, but modern automatics IIRC have different torque converters that don't let as much force thru at idle.
 

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#9 ·
I'm not used of the problem you are having sounds like cracked flexplate on other hand also have a problem with my dodge truck it blew a pressure line on the trans while on the highway by time got stopped I tried to move and it wouldn't move repaire the cooler line filled with fluidity drive it moves but starts in high gear when put in low gear its like putting in park could this be torque conv issue making it lock up in low gear but still has reverse and high gear any help would be appreciated because I don't want to rebuild if possible thanks
 
#10 ·
Hill Start Assist FTW! My 2014 JGC V6 has it.
 
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#11 ·
Desertryder said:
Greetings, I have a 2017 Durango SXT 3.6, 8 spd trans. My trans won't hold a hill. When I take my foot off the brake pedal it's like it's in neutral and rolls back. It's still under warranty so naturally I take it to the dealer.
They keep it for two days and tell me it's "working as designed at this time." The service manager tells me this is normal for the year and design of my vehicle. I promptly ask him and everyone else in the office how long
everyone has driven/ owned a vehicle with an automatic trans. and have they EVER had one not hold a hill that was operating properly. I get the deer in the headlight look. Sooo they came to the conclusion that the module
needs to be set back to 0 so the trans can re-learn. I was told to re-learn it for 500 miles. I'm throwing the BS flag. I was wondering if anyone else has had this issue and what the REAL diagnosis was.
Click to expand...
Bro im having same problem now mine saying service transmission
 
#12 ·
Bro, this thread is 4 years old, but did you read post #6?
 
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