Originally Posted by mlange
2015 GC Limited 4x2 V6 with about 600 miles. When driving down any moderately steep hill in 3rd or 4th gear, if I take my foot off the brake or gas pedal the RPMs increase fairly significantly but the transmission does not shift. I suspect this is some form of engine brakeing (trying to keep the speed constant) but it feels so odd and unnatural. Pressing the gas pedal will get the tachometer to calm down and the gears to upshift, but then you're speeding up when you don't want to.
Just yesterday I had the flash update TCM and PCM thinking this was a transmission issue. Now, I'm wondering if this type of downhill reaction is intended? No other noticeable transmission shifting issues.
Our prior 2012 GC didn't do this so it is alarming any time it happens.
Any thoughts or solutions?
Others more knowledgeable will chime in but after 28,000 on my 2014 here is my take: Jeep has this 8 speed set up to do what you describe, it won't stay in 7th or 8th gear going down a hill if your speed decreases (if you brake etc.) it will downshift and give you "assistance" in slowing down or holding the lower speed. I have gotten used to it and don't notice it bugging me as much now but I still would not choose it. To me brakes are cheap to replace as opposed to a transmission that is always downshifting, I also think it may have something to do with Jeep engineers not wanting it in 7 or 8th as you have slowed to 30 or 20 mph and then asking for quick accerleration so it has to go immediately from 8th to 2nd or 3rd? Not sure. I tow a 21 foot boat in good weather, close to 4000lbs, and the 8 speed & the V-6 do a great job with it, very pleased! dave