[katz]

while stopped at a light or a stop sign I get the warning display of proximity sensor as if the car thinks I'm parking and getting too close to car in front of me.
But,Neither me nor car in front of me is moving? I'm at a dead spot for a while before this even happens, and it'll randomly go off and on a few times.

ATS at dealer now and "dealer cannot replicate"

anyone else have this? He seemed surprised as he had not had this complaint yet.

 

[RippyPartsDept]

how close are you to the car in front when this happens?

 

[codeman71]

One guess that I can propose for this is the exhaust vapors from the car in front of you making it appear that there is something that is appearing and going away. If you are in the North, this could possibly what what you're seeing. If not, then I'm not sure. Again, I just work on the CUE system, and this is a different component, so I am only make a hypothesis here.

 

[pever]

I had this happen this morning (Premium with Driver Assistance Package). I was stopped at a red light with a car 6' in front of me for maybe 10 seconds before the front proximity alert showed and the seat vibrated. It happened a couple different times at different red lights. BUT, we were getting blowing snow and almost freezing rain conditions in Toronto at the time so I just ignored it. (I did wonder if it might try to brake at the "wrong" time, but that did not happen.)

 

[danscrim]

This happens to me every once in a while when it is snowing/freezing/sleeting out. It will work fine in that weather until you let ice accumulate on your sensor (which I believe is behind the Cadillac emblem). When that happens you'll get a false alarm. It's pretty obvious to tell it's a false because it will immediately jump to 4 bars and vibrating your seat instead of gradually incrementing the number of bars lit up.

I don't think there's anything that they can do about this. It's just a matter of the sensor reacting to the ice accumulating on your grill.

 

[katz]

Happened to me 2 times again yesterday using a Dealer Loaner ATS.
Was snowing and I guess that's what's setting it off falsely. No ice on the grill.
But still, really, doesn't work in the snow?
Fortunately there's a button on the dash to simply turn the thing off.

 

[danscrim]

Just thought about this more. Sensor for park assist might not be behind Cadillac emblem. That might be the long range sensor for ACC (as the emblem changes when Driver Assist Package is added). So the park assist sensors might be on the bumper somewhere.

 

[RippyPartsDept]

Just thought about this more. Sensor for park assist might not be behind Cadillac emblem. That might be the long range sensor for ACC (as the emblem changes when Driver Assist Package is added). So the park assist sensors might be on the bumper somewhere.

traditionally that is correct ... ACC radar behind the emblem and parking sensors spread out in the bumper

 

[CDN XTS]

This has happened to me too yesterday - stopped at light and no car in front. First time I thought it was the people crossing the street in front of me, but then another time "I believe" nothing in front of my car - it wasn't snowing either. Will keep an eye on this issue. I recall someone stating that his car stopped automatically when backing up against a pylon but not when he placed such in front of his XTS as it should. I have not tested this yet on my car but is this perhaps related to this issue, i.e. could it be an intermittent problem. Of course the warning doesn't mean the car would stop if still moving as it should? While ice/sleet accumulated on the sensors might be the trigger, I would assume than it would be on continuesly and not only when stopped at a red light.

 

[danscrim]

This has happened to me too yesterday - stopped at light and no car in front. First time I thought it was the people crossing the street in front of me, but then another time "I believe" nothing in front of my car - it wasn't snowing either. Will keep an eye on this issue. I recall someone stating that his car stopped automatically when backing up against a pylon but not when he placed such in front of his XTS as it should. I have not tested this yet on my car but is this perhaps related to this issue, i.e. could it be an intermittent problem. Of course the warning doesn't mean the car would stop if still moving as it should? While ice/sleet accumulated on the sensors might be the trigger, I would assume than it would be on continuesly and not only when stopped at a red light.

Well I think there's a few factors in play here. If it's the Park Assist that is acting up, then it will only happen at slow speeds because I'm pretty sure that system is only activated when the car is moving very slowly. It just isn't designed to be useful at driving speeds so it's probably not on or being looked at by the system which explains why we don't get false alarms while driving.

The reason I think it's snow/ice/etc on the sensors is because sometimes in the same weather conditions that produce this anomaly... I also lose my adaptive cruise control. When I go to enable it I get an error "Adaptive Cruise is temporarily unavailable." This has happened 3 times since I got the car in October. I'm not too upset about it because I do live in Syracuse, NY and get some of the most snowy, icy, and all around miserable weather imaginable. The systems work 99% of the time and Cadillac can't design everything for the frozen tundra of Upstate New York. At least that's my feeling. After the car is in the garage overnight, the systems work fine in the morning. It's just coming home from work when it's snowing and the temp is below 10 that seems to cause this.

 

[CDN XTS]

@ danscrim

I'll be watching this issue, although, being retired I avoid driving in really bad weather unless I have to.

As to the Park Assist aspect I agree with you as to when driving at normal speed, but when I came to a stop in front of a light I had slowed already down to less than walking speed before coming slowly to a complete stop so wouldn't Park Assist at that stage come into effect? Anyway, based on posting by someone who tested this, it only worked backing up. I did note then when parking in my garage going very slowly (not too much room lenghwise and I have to closely watch the red bar) I did once hit an about 30 inch high (soft) bag of of fertilizer in front of the wall and car did not apply the brake by itself.

I did notice that the Lane Departure issue got lost sometime which I certainly can see when the lane lines are covered with snow.

 

[NJRonbo]

Happened to me today.

Was first at the light. No car in front of me. My seat buzzed.

I am guessing perhaps ice on the front grill, but who knows.

 

[jonbaldbg]

I sure wish someone had an answer to this. We live in Kentucky and right now the weather is perfectly clear. The front sensors go off when you stop at a light or 4 way stop when there is NOTHING in sight. The dealer can't find any error codes. They updated the CUE software to the most recent and that didn't fix it. We took it in again and all they said was they couldn't duplicate it and they found a GM document stating that the front sensors can go off as much as 30 meters (32 yards) from an object.To me, that sounds ridiculous. Also, our sensors are going off when there is nothing around within 30 meters so that blows their theory. I'm taking the car to the Chevrolet service department next week to see what they can do. This is so frustrating.

 

[jeiler9865]

This is something that is very easy to overlook during the visual inspection steps of the vehicle. First off, this is the short range radar sensors in the front bumper, has the car been repainted in the front at all?? If no prior accident damage, the next thing I would ask is does this only happen at traffic lights while you sit above the in ground sensor for the traffic light.
Next thing is to check your front license plate bracket to see if it is mounted correctly and not upside down. This can be installed on both the ATS and CTS the WRONG WAY. Finally do you have a license plate frame around your front license plate or are all 4 screws securing the front plate to the bracket?

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Updating CUE software has absolutely nothing to do with this system.

 

[jonbaldbg]

This is something that is very easy to overlook during the visual inspection steps of the vehicle. First off, this is the short range radar sensors in the front bumper, has the car been repainted in the front at all?? If no prior accident damage, the next thing I would ask is does this only happen at traffic lights while you sit above the in ground sensor for the traffic light.
Next thing is to check your front license plate bracket to see if it is mounted correctly and not upside down. This can be installed on both the ATS and CTS the WRONG WAY. Finally do you have a license plate frame around your front license plate or are all 4 screws securing the front plate to the bracket?

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Updating CUE software has absolutely nothing to do with this system.

I will certainly check all these things. I don't think the car has been repainted, we bought it with 11,000 miles and it had a clean record. I'll check the other stuff. Thanks for these tips.

 

[jonbaldbg]

This is something that is very easy to overlook during the visual inspection steps of the vehicle. First off, this is the short range radar sensors in the front bumper, has the car been repainted in the front at all?? If no prior accident damage, the next thing I would ask is does this only happen at traffic lights while you sit above the in ground sensor for the traffic light.
Next thing is to check your front license plate bracket to see if it is mounted correctly and not upside down. This can be installed on both the ATS and CTS the WRONG WAY. Finally do you have a license plate frame around your front license plate or are all 4 screws securing the front plate to the bracket?

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Updating CUE software has absolutely nothing to do with this system.

OK, There's no repainting or damage. It happens even at four-way stops where there is no censor. It seems to always happen when stopping. The front license plate frame looks fine to me. I've included three pics, but they aren't real good. Hopefully good enough. It is secured with 4 rivets.

 

[Rich37082]

Since the problem seems rather repeatable, I'd remove the front license plate frame and see what happens....

 

[jonbaldbg]

Since the problem seems rather repeatable, I'd remove the front license plate frame and see what happens....

I thought about removing it totally when we got the car. But it is riveted on and I don't have the skills to remove it and put it back. If I leave it off the front end will probably look discolored where the frame was. What do you think?

 

[jeiler9865]

It looks like it is mounted correctly and nothing to affect the front radar sensor operation. Does the dash display service parking system or just give you indicators that you are close to something? I assume the servicing dealership scanned the vehicle for DTC's and did not find anything.
The carfax and history reports are very easy to falsify, I would only really trust the ones we can run thru GM vehicle investigatory history report.
An easy check on the front bumper you be to look for overspray on trim , radiator, and the clear rubber seals around the radar parking sensors in the bumpers.

 

[jonbaldbg]

It looks like it is mounted correctly and nothing to affect the front radar sensor operation. Does the dash display service parking system or just give you indicators that you are close to something? I assume the servicing dealership scanned the vehicle for DTC's and did not find anything.
The carfax and history reports are very easy to falsify, I would only really trust the ones we can run thru GM vehicle investigatory history report.
An easy check on the front bumper you be to look for overspray on trim , radiator, and the clear rubber seals around the radar parking sensors in the bumpers.

The dash just gives false positives that something is in front of you. It does work correctly when pulling into the garage as it shows an object close on the left when I get close to the lawnmower and workbench which is located right in front of the place the car is parked.

I haven't noticed any overspray and I don't know what the dealership did exactly. They said "no error codes." I will get my wife to pull the service ticket and see, but I am doubtful they detail it that much. I think, actually, that i will call them and ask them this question directly. We'll see if we get a straight answer. I already have an appointment for Tuesday for the Chevrolet dealer to look at it.