Cruise Control 'surging'

[Gondul]

Drove down to Miami and back from Tampa... while using both the Adaptive Cruise Control and normal Cruise Control, I could feel the truck constantly slowing and accelerating...while I can't say the road was perfectly flat, this is Florida so tak it for what it is worth... Anyone else experience anything similar?

Never had a vehicle behave int his manner...

 

[Buppies]

Have not felt what you describe in SW Va

 

[Deleted member 80]

My old 6.4 never did that. Out of curiosity, maybe try using the gear selector (-) button to select 8 so that MDS doesn't come on, and see if that changes anything.

 

[Ruffone]

I live in East Tennessee and drive in the mountains all the time and my cruise control stays pretty much right where I put it. It’s smooth without any surging so far with over 9,000 miles on the truck.

 

[Ivanvent]

I just picked up my truck from Idaho and drove it home about 900 miles. Adaptive cruise control worked great. There’s some setting to adjust some characteristics, have you tried that?

 

[Burn'n Oil]

Don't have ACC but use cruise frequently, especially towing on the prairie. The only issue I recall was having the cruise kick off while travelling over a rough road in a summer storm. I wasn't surprised it did that, though. Otherwise, the system has worked well. I especially like that you can fine tune the speed in one km/hr increments.

 

[Gondul]

My old 6.4 never did that. Out of curiosity, maybe try using the gear selector (-) button to select 8 so that MDS doesn't come on, and see if that changes anything.

I can certainly give that a try, I usually only disable it around town and not on the highway.
I had no issues with the the cruise control on my 2019 1500, so I'm finding this odd...

 

[Gondul]

I just picked up my truck from Idaho and drove it home about 900 miles. Adaptive cruise control worked great. There’s some setting to adjust some characteristics, have you tried that?

I'll look again, but the only thing I can recall to adjust is the distance at which it keep you from the vehicle in front of you.
In this case, on flat level ground and no one in front of me, I set the speed to 70, it slows down to 69 (sometimes it flickers the speed, sometimes not) then speeds up to 71 and the cycle repeats.

 

[AKDoug]

Mine does it periodically. The wife says she can't feel it in the passenger seat, but I can definitely feel it. It doesn't happen every time I drive the truck.

BTW.. if mine is doing it, I can duplicate it by shutting off the cruise and hold a very steady speed with the pedal.

 

[RamCares]

Drove down to Miami and back from Tampa... while using both the Adaptive Cruise Control and normal Cruise Control, I could feel the truck constantly slowing and accelerating...while I can't say the road was perfectly flat, this is Florida so tak it for what it is worth... Anyone else experience anything similar?

Never had a vehicle behave int his manner...

Mine does it periodically. The wife says she can't feel it in the passenger seat, but I can definitely feel it. It doesn't happen every time I drive the truck.

BTW.. if mine is doing it, I can duplicate it by shutting off the cruise and hold a very steady speed with the pedal.

Hello Gondul and AkDoug,
We are certainly sorry to hear about your recent concerns. If you feel your vehicle is not operating as designed we would kindly suggest bringing it to your servicing dealer as they appropriate tools to assist you and address any current concerns you may be experiencing. If you decide to go this route please know we are available if any assistance is needed throughout that process.
Laura
RamCares

 

[ahhhr]

My cruise control does a great job even on hills/mountains. Works great with exhaust brake.
The ACC does "surge" more than I like. It hits the brakes too hard (I can see the brake lights) when it should gently slow down. Accelerates a bit hard too but thats less of a problem I think. I'm not using it much anymore.

 

[Gondul]

My cruise control does a great job even on hills/mountains. Works great with exhaust brake.
The ACC does "surge" more than I like. It hits the brakes too hard (I can see the brake lights) when it should gently slow down. Accelerates a bit hard too but thats less of a problem I think. I'm not using it much anymore.

The ACC on the RAM isn't anywhere near as nice as the ACC on my wife's Subaru... I'm guessing the difference is whatever RAM is using vs the cameras used by Subaru.

 

[AKDoug]

Hello Gondul and AkDoug,
We are certainly sorry to hear about your recent concerns. If you feel your vehicle is not operating as designed we would kindly suggest bringing it to your servicing dealer as they appropriate tools to assist you and address any current concerns you may be experiencing. If you decide to go this route please know we are available if any assistance is needed throughout that process.
Laura
RamCares

I appreciate the response. I will be blunt, though. My experience with my dealership has been less that expected. Last I checked my dealership was 4 weeks out to look at any issue I have with my truck. The last issue I solved myself. This small surging issue is something i doubt they'd replicate without the right temperature and use parameters. At this point I'd label it more of an "idiosyncrasy" than a problem.

 

[RamCares]

I appreciate the response. I will be blunt, though. My experience with my dealership has been less that expected. Last I checked my dealership was 4 weeks out to look at any issue I have with my truck. The last issue I solved myself. This small surging issue is something i doubt they'd replicate without the right temperature and use parameters. At this point I'd label it more of an "idiosyncrasy" than a problem.

Hello AkDoug,
We appreciate you providing feedback here and you sentiments expressed are certainly understandable. Please do not hesitate reaching out to us in the future if you have any questions or concerns.
Laura
RamCares

 

[ahhhr]

The ACC on the RAM isn't anywhere near as nice as the ACC on my wife's Subaru... I'm guessing the difference is whatever RAM is using vs the cameras used by Subaru.

The sensors seem to pick up the data correctly and the truck really pounds on the brakes if I pull in close behind someone - so they know the difference between close and far. I think the problem is the sensitivity in determining a response.
I bet mine could be fixed with a software update. But the way it is now, with ACC on, my truck drives like some of the most irritating drivers. Pound the gas, hit the brakes. Repeat. Not quite that bad but irritates me enough not to use it.

I don't have the latest updates from the dealer. I should get that done. That's staring to bug me too - that I have to go there for something the computer industry has been using the internet to do for years.

 

[Deleted member 80]

My truck does not have ACC, but even the regular cruise is more abrupt than my last two trucks. Resume really gets on it if there is a speed deficit. I tend to get it close to my set speed with my foot before hitting resume. There should be a setting for rate of acceleration.

 

[Ruffone]

I’ve noticed on mine that pretty much whatever my foot was doing with the gas pedal when I press resume then that is how resume responds. If I’m laying into it then resume will too, if I’m easing my way up then resume responds in like.

 

[Bad Tiki]

I’ve had my 2019 PW for about two weeks now. I drive 95% highway and always use cruise control and have noticed this surging (normal cruise and adaptive , with and with out mds on). It seems to run about 1kph above setting and when it hits set point will then surge back to 1 above SP.

 

[j_t_l]

The sensors seem to pick up the data correctly and the truck really pounds on the brakes if I pull in close behind someone - so they know the difference between close and far. I think the problem is the sensitivity in determining a response.
I bet mine could be fixed with a software update. But the way it is now, with ACC on, my truck drives like some of the most irritating drivers. Pound the gas, hit the brakes. Repeat. Not quite that bad but irritates me enough not to use it.

I don't have the latest updates from the dealer. I should get that done. That's staring to bug me too - that I have to go there for something the computer industry has been using the internet to do for years.

Yup -- the adaptive cruise control on the RAM is a bit annoying in some circumstances.

I have a Chevy Volt with ACC, and it works great! If a car going about the same speed or a little slower pulls in my lane "too close" in front of me -- the ACC slows down gracefully and increases to the proper distance.

If the same thing happens in my 2019 RAM 2500 (car pulls in front of me, going slightly slower than I am) -- the RAM slams on the brakes, gets to the right distance, then guns it to pick up speed again. It really needs to be smoothed out. Not only is it not great for the folks inside the truck, I'm almost embarrassed to have other drivers look at me like "wtf is wrong with that guy?"

 

[jasonjm]

Drove down to Miami and back from Tampa... while using both the Adaptive Cruise Control and normal Cruise Control, I could feel the truck constantly slowing and accelerating...while I can't say the road was perfectly flat, this is Florida so tak it for what it is worth... Anyone else experience anything similar?

Never had a vehicle behave int his manner...

ram really needed to use a smoothing algorithm on this thing. if you are following a car in front of you, it matches the cars driving in front of you exactly. in other words if the driver in front of you is crap, like an idiot who constantly breaks or accelarates, the ACC on my truck actually makes me car sick as it matches what the useless driver in front is doing.

then the other stupid thing it can do is get stuck between 2 gears, especially when going slow, around 10mph, it with shift nonstop between 2 gears, up down up down, in a very irritating jerky way.

anyways RAM if you are reading this - please, a smoothing algo on your ACC, there is no reason to keep EXACT distances at 200 to 400 feet, let the smoothing algorithm let the gap vary by 20 to 40 feet.