2012 JKU Auto

Cruise control shuts off going up a grade. It seems as if it turns off when the transmission needs to downshift to maintain speed. Every other vehicle I've been behind the wheel of will simply down shift, and maintain a solid cruise speed.

Is this normal?

 

Had mine on a long 1000 mile trip over lots of grades. It downshifted on some and seemed to me that it stayed in the lower gear longer than I'd expected sometimes, but it maintained a constant speed and never shut off.

 

This problem happens on the same grade on my way home from work. It's not a totally steep grade, but I can feel the engine start to rev, and right as I feel like the trans is about to downshift, cruise control deactivates. It's still illuminated on the dash, it's just as if I've hit cancel.

 

Mystery debunked. The incline my cruise keeps kicking off on (@ 70mph mind you) just past an overpass bridge, that is a bit rough, but nothing you'd think twice about. This morning, I paid special attention, and as I went over this rough spot, and the cruise kicked off, the traction control light blinked very obviously. It was raining this morning, so I guess the Jeep gets off balance enough on this bump on dry road to kick off, and me not notice the traction control light coming on, but this morning where it was wet, the slip was exaggerated enough for me to see.

 

Gotta love that feature. There's a spot on the interstate near my house that when I hit it just right does the same thing. And now that I think about it, it's right as I start going up an overpass too. Anyway, it makes perfect sense especially from a safety standpoint. And with as stiff as our suspensions are (even with upgraded shocks), there's no doubt that it's needed. But it's still a little annoying when it happens.

On the plus side, at least you know what's going on now! I don't know about you, but I'm far less frustrated by a problem if there's no mystery as to what's causing it.