OT: GMC Sierra Question

SyonaraStanz

Senior
Mar 5, 2010
3,229
583
113
I just traded in my F150 for a GMC Sierra 1500. Not real impressed so far. One reason I went with this specific truck is it has adaptive cruise control. After a week of driving, it’s starting to disengage the adaptive cruise and make it “unavailable.” It happened about 10 times on my 80 mile drive yesterday. The truck’s spotless, so no issues with something blocking sensors. Anyone else have this issue on GM vehicles?
 

aTotal360

Heisman
Nov 12, 2009
22,592
16,475
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Unlike regular CC, I know that touching the gas while it's on will mess it up. Maybe that's what you're doing?
 

M R DAWGS

All-Conference
Apr 13, 2018
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I have the adaptive cruise on my 2020 Sierra and have had no issues with it. Best truck I’ve ever owned so far.
 
Nov 16, 2005
29,457
24,716
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You might have a sensor issue. If the computer senses any kind of issue with being able to “see” objects with the sensors it’s going to shut it down.
 
Feb 15, 2013
507
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Under warranty? Have them fix it.

ETA

I have a 2016 Sierra but no adaptive cruise. It is a 4x4 with all the bells and whistles. A/C seats are awesome in the summer. It’s been a great truck but I have to learn to live with the hard shifting 10 speed transmission.
 
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xxxWalkTheDawg

Redshirt
Oct 21, 2005
4,262
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That’s not normal

I’ll just be cruising along not touching anything, and it’ll shut down.

it’s not supposed to just shut down unless you take action to. You have some kind of issue. Take it by a dealership and get that seen about under warranty.
 

Hanmudog

Redshirt
Apr 30, 2006
5,853
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I just traded in my F150 for a GMC Sierra 1500........................

First mistake right there. I did the same thing several years ago, traded my F-150 for a Silverado and had nonstop issues with it until I finally said to hell with it and eventually went back to an F-150 and have not had a single problem with it in the 7 years I have been driving it.
 
Nov 16, 2005
29,457
24,716
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There are so many things that start rattling in a Ford truck that it becomes unbearable. The quality has gone way down.
 

SyonaraStanz

Senior
Mar 5, 2010
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it’s not supposed to just shut down unless you take action to. You have some kind of issue. Take it by a dealership and get that seen about under warranty.

I’ll do that. Now I have the joy of leaving my vehicle at a dealership for days on end for them to tell me they can’t recreate the issue. Less than 1,000 miles and already planning a visit to the shop.
 

MaxwellSmart

All-Conference
May 28, 2007
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Keep the Sierra and get it fixed under warranty. Every manufacturer has some issues but never I repeat never will I purchase another Ford.
 

tired

All-Conference
Sep 16, 2013
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I can tell you from experience, that GM's build quality is a good bit behind Ford. The parts used by GM are cheaper made than what Ford uses. To each his own. I would take it back to the dealer. Good luck.
 

Seinfeld

All-American
Nov 30, 2006
11,679
7,959
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You and I have the same issue there. I swear... if my wife's passing a weaving 18-wheeler on the freeway, she'll hang out in his blind spot for seemingly an hour while eventually going by him at a speed of exactly .5 miles/hr faster than him.

On the other hand, if she needs to get by a Prius on a wide open road, she'll gun that thing like she's trying to win a drag race, and I can practically hear the transmission screaming for mercy
 

turkish

Junior
Aug 22, 2012
997
376
63
“Our technician couldn’t reproduce the problem, sir.” Get ready.

I’d recommend trying to film the issue if you can do so safely.

Toyota and GM were the most stubborn about honoring warranty IME. Ford was so-so. Honda has been great. All anecdotal.
 
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jdbulldog

Junior
Oct 27, 2007
2,594
368
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Sounds as if you traded with the wrong dealership if you have that little confidence in them.

I’ll do that. Now I have the joy of leaving my vehicle at a dealership for days on end for them to tell me they can’t recreate the issue. Less than 1,000 miles and already planning a visit to the shop.
 

SyonaraStanz

Senior
Mar 5, 2010
3,229
583
113
Sounds as if you traded with the wrong dealership if you have that little confidence in them.

i have that little confidence in most dealerships. I bought from a dealership about 3 hours away, so they won't be my service location.
 

patdog

Heisman
May 28, 2007
60,830
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That’s when I say, get in the car. We’re going for a ride & I’ll show you.
 

Go Budaw

Redshirt
Aug 22, 2012
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“Our technician couldn’t reproduce the problem, sir.” Get ready.

I’d recommend trying to film the issue if you can do so safely.

Toyota and GM were the most stubborn about honoring warranty IME. Ford was so-so. Honda has been great. All anecdotal.

FYI, the brand of the vehicle has absolutely nothing to do with how stubborn they are about warranty. Dealerships are independent businesses that are totally separate from not only the manufacturer but also the sales division of the manufacturer. They also make just as much money from warranty repairs (if not more) as they do from out of warranty service and repairs. Manufacturer reimburses them a premium amount compared to the hourly rate for normal repairs and service, and they also have carte blanche to do just about whatever troubleshooting they want on the manufacturer’s dime if the problem is not easily reproducible.
 
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RocketDawg

All-Conference
Oct 21, 2011
20,203
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I just traded in my F150 for a GMC Sierra 1500. Not real impressed so far. One reason I went with this specific truck is it has adaptive cruise control. After a week of driving, it’s starting to disengage the adaptive cruise and make it “unavailable.” It happened about 10 times on my 80 mile drive yesterday. The truck’s spotless, so no issues with something blocking sensors. Anyone else have this issue on GM vehicles?

Don't know how the adaptive cruise control works on your Sierra, but on my Subaru there are two cameras at the top of the windshield on either side of the rear view mirror. Basically, it can't see under conditions that you can't see well under - into the sun, hard rain, fog spray from other vehicles, etc.

How was the weather when yours quit working?
 

SyonaraStanz

Senior
Mar 5, 2010
3,229
583
113
Don't know how the adaptive cruise control works on your Sierra, but on my Subaru there are two cameras at the top of the windshield on either side of the rear view mirror. Basically, it can't see under conditions that you can't see well under - into the sun, hard rain, fog spray from other vehicles, etc.

How was the weather when yours quit working?

Good, sunny. It works, but after 20 miles or so it disengages. Then from that point until the end of the drive, it works for a few miles then cuts off repeatedly.
 

greenbean.sixpack

All-American
Oct 6, 2012
9,463
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I just traded in my F150 for a GMC Sierra 1500. Not real impressed so far. One reason I went with this specific truck is it has adaptive cruise control. After a week of driving, it’s starting to disengage the adaptive cruise and make it “unavailable.” It happened about 10 times on my 80 mile drive yesterday. The truck’s spotless, so no issues with something blocking sensors. Anyone else have this issue on GM vehicles?

Don't 17 around with American Manufacturers, get a Tundra, it won't have AC shooting up your bung hole, but it rides good, has plenty of power, the biggest back seat and will operate for a decade/200k+ miles with no mechanical issues.
 
Feb 15, 2013
507
0
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I’ll do that. Now I have the joy of leaving my vehicle at a dealership for days on end for them to tell me they can’t recreate the issue. Less than 1,000 miles and already planning a visit to the shop.

i bought mine at Phil Moore GMC in Jackson and had to leave it a few times and they always gave me a Sierra to drive. No need to overthink this.
 

SyonaraStanz

Senior
Mar 5, 2010
3,229
583
113
What's happening on your dash? Does the CC light turn blue?

No. A message “Adaptive Cruise Control Disengaged” pops up. Then if I hit the resume button, it says “Adaptive Cruise Control Not Available”. I can switch to regular cruise without issue. I can also completely turn off cruise and start again; it’ll go a few miles then repeat the disengage. This starts after about 20 - 25 miles of driving.
 

dawgstudent

Heisman
Apr 15, 2003
40,584
22,471
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I absolutely hate adaptive cruise control. My wife's car has it and I just use the regular cruise control. I hate it constantly slowing down and speeding up on the interstate. I usually stay in the upper 70's while driving and it's just annoying to me as a driver.
 

patdog

Heisman
May 28, 2007
60,830
32,183
113
I see I'm not the only one. It's not like I'm ever going to hit the car in front of me anyway, so it's pretty useless. But then with the false positives (slowing down when there's no need) and especially the false negatives (not slowing down when it should), it can be dangerous by lulling drivers into a false sense of security while they're texting on their cell phones.
 

Drebin

Heisman
Aug 22, 2012
22,703
27,992
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I can tell you from experience, that GM's build quality is a good bit behind Ford. The parts used by GM are cheaper made than what Ford uses. To each his own. I would take it back to the dealer. Good luck.

Yeah, this is ********. No offense.
 

RocketDawg

All-Conference
Oct 21, 2011
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My wife’s Armada has it and I hated it at first but now I like it.

I like mine too but it takes a bit of getting used to.

I have heard of people (none here) that use it on urban freeways in heavy traffic, and it's just not designed for that sort of thing.
 

Wizard.sixpack

Freshman
Sep 15, 2009
6,511
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I just traded in my F150 for a GMC Sierra 1500. Not real impressed so far. One reason I went with this specific truck is it has adaptive cruise control. After a week of driving, it’s starting to disengage the adaptive cruise and make it “unavailable.” It happened about 10 times on my 80 mile drive yesterday. The truck’s spotless, so no issues with something blocking sensors. Anyone else have this issue on GM vehicles?

I bet it's not as annoying as Ford's Auto Start-Stop system....
 

kired

All-Conference
Aug 22, 2008
7,150
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They also make just as much money from warranty repairs (if not more) as they do from out of warranty service and repairs. Manufacturer reimburses them a premium amount compared to the hourly rate for normal repairs and service, and they also have carte blanche to do just about whatever troubleshooting they want on the manufacturer’s dime if the problem is not easily reproducible.

See, I've always heard just the opposite. The manufacturer reimburses them for warranty work - but it's at a lower rate than they charge customers for service work. So if a dealership has their choice, they'd choose normal service work.

It's also my understanding they get paid for the actual warranty work - but not for the time they spend unsuccessfully trying to reproduce a problem. So if it's not a common problem, there's no error code logged, and you don't regularly bring your car into their shop for service - they're going to be reluctant to try and diagnose it.

Any service managers here who can tell us how it really works?
 

Go Budaw

Redshirt
Aug 22, 2012
7,321
0
36
I absolutely hate adaptive cruise control. My wife's car has it and I just use the regular cruise control. I hate it constantly slowing down and speeding up on the interstate. I usually stay in the upper 70's while driving and it's just annoying to me as a driver.

My experience with adaptive cruise control seems to always be as follows. On rural section of interstate, driving 78-79 or so in RH lane. Have another car about 50 yards behind me traveling about same speed. I come up on vehicle ahead of me going about 70, so I make a move to get over, except the ACC kicks in and slows me down before the lane change. This causes the car behind me to get over and pass me, and I have to wait on him before passing the original vehicle. The only other option is to proceed with the lane change anyway and then you cut off the guy behind you.

The biggest problem is that this encourages everyone’s least favorite driving behavior, getting over in the left lane earlier and staying there longer to avoid being slowed down by the system. I’ve also had other issues with things like bridges and construction barrels being picked up by the sensors and slowing you down for no reason at all.
 

SyonaraStanz

Senior
Mar 5, 2010
3,229
583
113
I absolutely hate adaptive cruise control. My wife's car has it and I just use the regular cruise control. I hate it constantly slowing down and speeding up on the interstate. I usually stay in the upper 70's while driving and it's just annoying to me as a driver.

It’s not beneficial on busy interstates, but I drive rural highways, so it’s nice to set it and sit back. Every once in a while, I come up on a car and it takes care of the speed until I pass. I got very used to it in my Ford, which worked like a charm. It creates a risk when I drive non-ACC cars and forget I don’t have ACC. That results in some unkind language from your spouse sitting shotgun.
 

Go Budaw

Redshirt
Aug 22, 2012
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36
I bet it's not as annoying as Ford's Auto Start-Stop system....

Stop-Start isn’t exclusive to Ford....most all OEM’s are using it now to help hit CAFE targets for their fleets. And yes, it is universally annoying.
 
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