does anybody else have surges with the cruise control engaged?

[2018 black jl rubicon]

my rpms surge from 2000 to 2500 to 3000 rpms and causes jerking when the cruse is engaged has anyone else experienced this problem

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[$uicide$hift]

my rpms surge from 2000 to 2500 to 3000 rpms and causes jerking when the cruse is engaged has anyone else experienced this problem

Just for more detail is this on a flat or is this specific to inclines or declines?

 

[Hootbro]

I bought my JL this last Monday with less than 20 miles on the odometer. Had a 80 mile ride to get home and when I engaged the cruise for the first time on the highway, I had the same issue of the rpm pulsing up and down and the sensation of the transmission hunting for a gear. I disengaged it for most of the rest of the trip home and retried the cruise and had no issue. I chalked it up to the adaptive learning not being set yet in the PCM.

 

[Dynomite1371]

Take it in, not normal! I use it every morning. Should be smooth af.

 

[Fuel Fire Desire]

Mine does it occasionally, but I know why.


I have a base Sport S, with 33” tires. There’s simply not enough gear to keep it going, even on level ground, at 70 with any kind of wind. So the transmission hunts between 7th and 8th trying to decide between over revving, and overloading the engine. The result is surging between 1700 and 2300 rpm, or up to 3000 rpm if it goes up an incline and drops into 6th.


I had to to do the same thing manually in my...manual...JK. It couldn’t hold 70 in 6th with the top and doors off, so I had to keep it in 5th....and down shift into 3rd for any sort of incline or acceleration.


For me, at least, it’s gearing and lack of torque. It’s no streamlined car, and it’s no torque monster V8 that can just chug through it.


The JL on the stock donut tires did not do this.

 

[FatBoy01]

my rpms surge from 2000 to 2500 to 3000 rpms and causes jerking when the cruse is engaged has anyone else experienced this problem

I'm curious at what speed were you traveling when you engaged the cruise control?
You were driving on flat, hilly road?
Have you ever driven a Wrangler with cruise control before or say just cars with cruise control?
Tire size?

 

[bam1111]

What? You use cruise control in a Jeep?

 

[$uicide$hift]

I thought to myself could this be some smart programing where the Jeep knows it is in break in mileage where you should not be cruising at a constant speed and it is changing gears to address this.

That would be interesting but I doubt anything like that was implemented.

 

[FatBoy01]

What? You use cruise control in a Jeep?

I know I do ... I often and I mean often, drive my Jk, say 1200 miles on the interstate at a pop... stopping to pzzz and chitt only. Eating as I drive. I'm pulling an open motorcycle trailer with a Harley FatBoy on board. I do the 1200 mi. drive (19-21 hrs. depending on traffic) non-stop to my destination.

Cruise control lets me give the right foot/leg a change of position, etc...

 

[BillyHW]

Use of cruise control on the highway should be mandatory.

 

[kurt13]

The first 2-3 times I used cruise control, I had some mild surging. At 60 MPH, the Jeep kept shifting between 7th and 8th gear with noticeable surging. Since then, I've used cruise control and it's been as smooth as any other vehicle I've had. I think it's all part of the "self-calibrating" transmission electronics, which I'd love to learn more about.

Does anyone know how self-calibrating transmission electronics work and why Jeep wouldn't hard code shift points, etc into the vehicle? Why does it need to run to calibrate? Or is it just the step prior to Skynet becoming self-aware?

 

[PaPasJP]

Haven't had any surging with the cruise, matter of fact I like it better than all of the previous cruise controls as it maintains speed better not only up hill but down as well.

I have to use cruise almost all of the time due to a lead foot............

 

[Man-of-methods]

I bought my JL this last Monday with less than 20 miles on the odometer. Had a 80 mile ride to get home and when I engaged the cruise for the first time on the highway, I had the same issue of the rpm pulsing up and down and the sensation of the transmission hunting for a gear. I disengaged it for most of the rest of the trip home and retried the cruise and had no issue. I chalked it up to the adaptive learning not being set yet in the PCM.

I thought that the use of cruise control was to be avoided during the break-in period of the first 300 miles?
Ergo your problemo

 

[Hootbro]

I thought that the use of cruise control was to be avoided during the break-in period of the first 300 miles?
Ergo your problemo

There is thinking and there is knowing. The owners manual does not address what you mention.

 

[macintux]

There is thinking and there is knowing. The owners manual does not address what you mention.

Yes and no. They do recommend varying the speed, which is obviously not running on cruise control.

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