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  #1  
Old 03-17-2015, 10:57 PM
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Gears not holding on steep hill

I have a my 2014 JGC diesel Overland. For the first time since I bought it, I came across an extremely steep hill on a 4wd track. In Low Range "mud" and Offroad 2 suspension setting, I selected first gear with the paddles, to maximise engine braking - as one would in a manual transmission. Problem was, the car would suddenly upshift to second gear, and then if I let it go a bit fast, it would upshift to third. I don't know if it would have upshifted to fourth, as that would have been too fast. In fact, third was too fast.
It was not an engine revs issue, as the upshifts were occurring around 2000 rpm. It seemed to be somehow related to speed, or maybe acceleration though, as it happened as the speed built up quickly. It does not happen on the flat, and will rev to at least 4000 using the throttle.
Has anyone else experienced this, or have an explanation?
Thanks,
Russell

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  #2  
Old 03-19-2015, 07:41 PM
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Re: Gears not holding on steep hill

Quote:
Originally Posted by lt4vette View Post
I have a my 2014 JGC diesel Overland. For the first time since I bought it, I came across an extremely steep hill on a 4wd track. In Low Range "mud" and Offroad 2 suspension setting, I selected first gear with the paddles, to maximise engine braking - as one would in a manual transmission. Problem was, the car would suddenly upshift to second gear, and then if I let it go a bit fast, it would upshift to third. I don't know if it would have upshifted to fourth, as that would have been too fast. In fact, third was too fast.
It was not an engine revs issue, as the upshifts were occurring around 2000 rpm. It seemed to be somehow related to speed, or maybe acceleration though, as it happened as the speed built up quickly. It does not happen on the flat, and will rev to at least 4000 using the throttle.
Has anyone else experienced this, or have an explanation?
Thanks,
Russell
Does your WK2 have the hill decent feature?
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Old 03-19-2015, 08:15 PM
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Re: Gears not holding on steep hill

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Originally Posted by JoeD View Post
Does your WK2 have the hill decent feature?
Yes. I started out trying to use the hill descent control, but it got too scary. The hill had large water diversion humps across it, which required a touch of throttle to get over. Touching the throttle deactivates HDC. Going down the other side of the hump, the HDC re activated again when I let off the throttle, and instantly locked up one or both rear wheels trying to control speed. Problem was it was very slippery with a sideways slope to a steep drop, and the back of the car would slide out. That's when I tried to revert to manual gears.
I have since found that there is a transmission TSB which may fix the gear holding issue, amongst other things, so I will see if I can get that applied.
Thanks,
Russell
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Old 06-24-2015, 12:49 AM
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Re: Gears not holding on steep hill

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Originally Posted by lt4vette View Post
I have a my 2014 JGC diesel Overland. For the first time since I bought it, I came across an extremely steep hill on a 4wd track. In Low Range "mud" and Offroad 2 suspension setting, I selected first gear with the paddles, to maximise engine braking - as one would in a manual transmission. Problem was, the car would suddenly upshift to second gear, and then if I let it go a bit fast, it would upshift to third. I don't know if it would have upshifted to fourth, as that would have been too fast. In fact, third was too fast.
It was not an engine revs issue, as the upshifts were occurring around 2000 rpm. It seemed to be somehow related to speed, or maybe acceleration though, as it happened as the speed built up quickly. It does not happen on the flat, and will rev to at least 4000 using the throttle.
Has anyone else experienced this, or have an explanation?
Thanks,
Russell
I posted this 3 months ago, and have been hassling my dealer for a response ever since.
There is a TSB which describes the symptom fairly well, 21-012-15, but they told me that my car already has that applied. Which is strange, because I first asked for it to be applied in March after its release on February 28. Finally, I was told that this characteristic is "normal" ("they all do it"). After trying to ensure they understand I am using the paddles as in manual mode, not automatic, they say that the car will still upshift under some conditions. It's not RPM as I described above. I guess it's conceivable that load on the drivetrain can trigger an upshift.
But it is positively dangerous for the car to upshift suddenly on a steep and slippery slope, and in my opinion is totally out of character for a seriously good off-road vehicle.
Having said all that, my question is simple:
Has anyone else here experienced the same problem - car will not hold a gear selected with the paddles, in low range, down a (very) steep hill?
Thanks,
Russell
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Old 06-24-2015, 06:31 PM
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Re: Gears not holding on steep hill

I had the same issue on my 2014 wk2, dealer also advised "they all do that". I got them to do the transmission update anyway and its been fine ever since.
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Old 06-24-2015, 06:45 PM
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Re: Gears not holding on steep hill

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I had the same issue on my 2014 wk2, dealer also advised "they all do that". I got them to do the transmission update anyway and its been fine ever since.
Thanks Indyof. I really do believe that is the solution - both your experience and the symptom as described in the TSB convince me of that. The mechanic has been unable to apply the update - while the info he has says it is applicable to my VIN, when he hooks it up to the computer, it just won't load. After three months of hassling, Jeep Australia techs told him that is because my car already has the update applied - which is hard to believe as my car is old (May 2013 build), the fix wasn't released until Feb 2015, and both the mechanic and I would know if it had been done. But I don't know how to prove this. In fact, the mechanic told me that he can't tell what updates have been applied by interrogating the relevant module.
So I think my best chance is to complain about the problem, and let them figure out how to fix it. However, "they all do that".
Thanks,
Russell
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Old 06-25-2015, 07:12 AM
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Re: Gears not holding on steep hill

Quote:
Originally Posted by lt4vette View Post
Has anyone else experienced this, or have an explanation?
Thanks,
Russell

Have you tried actually using Hill Descent Control and see if the behavior is reproducible ?

It might be an erroneous calibration specific to diesels, but none too different from what happens when you cruise at 35-45 mph (6th or 7th gear) and when you let go of the throttle, the car up-shifts to 8th then down-shifts entirely based on speed, and to maximize cruising distance.

The fact that you were in 4-LO should tell the transmission to avoid that behavior - but then again that is what HDC also does. But then again, one could be in 4-LO and ORA-2 and if switching between the various Selec-Terrain modes would lower the car at the worst moments. Jeep have indeed messed up some calibrations - but more than we collectively knew about.
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Old 06-25-2015, 07:20 AM
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Re: Gears not holding on steep hill

HDC only works up to 8kmh and uses the brakes.
When in manual mode the car shouldnt shift up unless you tell it to. The issue is in manual mode, the car will shift up gears when going down hill. The TCM update fixes this issue.
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Old 06-25-2015, 07:32 AM
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Re: Gears not holding on steep hill

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Originally Posted by f1anatic View Post
Have you tried actually using Hill Descent Control and see if the behavior is reproducible ?

It might be an erroneous calibration specific to diesels, but none too different from what happens when you cruise at 35-45 mph (6th or 7th gear) and when you let go of the throttle, the car up-shifts to 8th then down-shifts entirely based on speed, and to maximize cruising distance.

The fact that you were in 4-LO should tell the transmission to avoid that behavior - but then again that is what HDC also does. But then again, one could be in 4-LO and ORA-2 and if switching between the various Selec-Terrain modes would lower the car at the worst moments. Jeep have indeed messed up some calibrations - but more than we collectively knew about.
I tried HDC, but there were large water diversion humps which required a touch of the throttle, causing the HDC to disengage, then engage violently down the almost vertical side of the hump.
Indyof, I may have asked you this before, but can you tell me the details of your car and the dealer who applied the fix?
(For some reason I assumed you're in Australia, but if not, then the dealer won't help me much! But is it a diesel?)
Thanks,
Russell
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Old 06-25-2015, 07:37 AM
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Re: Gears not holding on steep hill

June 2014 Overland, Suttons Waitara applied the fix.
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Old 06-28-2015, 07:28 PM
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Re: Gears not holding on steep hill

I had 21-012-15 applied a month ago during my service as I requested it saying I had two problems. 1 - ECO butin won't stay off, 2 - it wasn't downshifting correctly when cruise control was on and going down a hill, ie, it would do a piss poor job of maintaining speed, it would just keep increasing with no engine braking at all. I would go from a set 60 and keep rolling to 80, 90 etc..
I don't take our GC off road, but I know the bulletin was applied despite the fact that the wallys at Waitara don't supply me with paperwork saying it was done.

If you are driving on a normal sealed road, using cruise control set to say doing 60 or 80, and you start to go down a decent hill, does it down shit and apply engine braking to retard acceleration and bring you back to the set cruise control level? Mine now does this correctly.

If it does this, then I would say the TSB has been applied.
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Old 06-29-2015, 01:02 AM
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Re: Gears not holding on steep hill

That is interesting. Mine has always downshifted to maintain speed - right from new. While it s possible that my early build car did not have a fault which was introduced later, my VIN still comes up as eligible for the TSB. Plus, Indyof had the same low range problem as me and the TSB fixed it.
Quite confusing actually, but your experience does add weight to JAs position.
I must go out and try it again - there's even a possibility that when the dealer thought the flash failed, it worked. This happened to me once before with Uconnect. They said they could not upgrade it because I had foreign software on my radio (Customtronix, which I had rolled back, but apparently not successfully) but in fact it had been upgraded.
Thanks,
Russell
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