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Discussion Starter · #1 ·
We've had two instances where we were driving with the Smart Cruise Control (SCC) and all of a sudden, our vehicle immediately slowed down as if I had applied the brakes.

One instance was on a freeway with no surrounding traffic, the other was on a long local street with no surrounding traffic; freeway speed was 65 - 79mph, the local street was 35mph (I know it may sound strange using the SCC at that speed, but it was a long stretch and a known speed trap area).

Both roads were in good shape with no obstructions in the roadway.

Our main concern is that if the vehicle immediately slows down without the brakes being applied (and brake lights), we could potentially get rear-ended.

I researched and it appears that it could be related to the Navigation - Smart Cruise Control - Highway Auto Speed option, but just curious if anyone else has experienced this type of issue and were able to get an explanation on why it happened?
 

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We've had two instances where we were driving with the Smart Cruise Control (SCC) and all of a sudden, our vehicle immediately slowed down as if I had applied the brakes.

One instance was on a freeway with no surrounding traffic, the other was on a long local street with no surrounding traffic; freeway speed was 65 - 79mph, the local street was 35mph (I know it may sound strange using the SCC at that speed, but it was a long stretch and a known speed trap area).

Both roads were in good shape with no obstructions in the roadway.

Our main concern is that if the vehicle immediately slows down without the brakes being applied (and brake lights), we could potentially get rear-ended.

I researched and it appears that it could be related to the Navigation - Smart Cruise Control - Highway Auto Speed option, but just curious if anyone else has experienced this type of issue and were able to get an explanation on why it happened?
what speed did it slow down to each time? I was thinking it might be an exit ramp on the highway you might have gotten too close to even though you didn’t take it as the car might swerve in that direction because there are no right lane markers at exits.

page 7-69 of the following owners manual starts information on the SCC there are many reasons this could happen.

https://owners.genesis.com/genesis/...-manual/2021/gv80/2021-GV80-Owners-Manual.pdf
 

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Discussion Starter · #3 ·
what speed did it slow down to each time? I was thinking it might be an exit ramp on the highway you might have gotten too close to even though you didn’t take it as the car might swerve in that direction because there are no right lane markers at exits.

page 7-69 of the following owners manual starts information on the SCC there are many reasons this could happen.

https://owners.genesis.com/genesis/...-manual/2021/gv80/2021-GV80-Owners-Manual.pdf
what speed did it slow down to each time? I was thinking it might be an exit ramp on the highway you might have gotten too close to even though you didn’t take it as the car might swerve in that direction because there are no right lane markers at exits.

page 7-69 of the following owners manual starts information on the SCC there are many reasons this could happen.

https://owners.genesis.com/genesis/...-manual/2021/gv80/2021-GV80-Owners-Manual.pdf
Thanks for the reference to the owner's manual sections - that seems to be in line with what I thought, and provides additional details for reasons it may be happening.
 

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We've had two instances where we were driving with the Smart Cruise Control (SCC) and all of a sudden, our vehicle immediately slowed down as if I had applied the brakes.

One instance was on a freeway with no surrounding traffic, the other was on a long local street with no surrounding traffic; freeway speed was 65 - 79mph, the local street was 35mph (I know it may sound strange using the SCC at that speed, but it was a long stretch and a known speed trap area).

Both roads were in good shape with no obstructions in the roadway.

Our main concern is that if the vehicle immediately slows down without the brakes being applied (and brake lights), we could potentially get rear-ended.

I researched and it appears that it could be related to the Navigation - Smart Cruise Control - Highway Auto Speed option, but just curious if anyone else has experienced this type of issue and were able to get an explanation on why it happened?
Mine has a hard, dangerous deceleration at the same spot every time on the interstate. It goes from 75 to slow until I override. The spot is a moderate downhill approaching a short bridge, which is much lighter than the dark highway. I believe it sees the upcoming light area as a fixed object in the road. Very scary when someone is right behind you. I've learned to anticipate it and just accelerate until it releases. Wakes you up for sure.
 

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We've had two instances where we were driving with the Smart Cruise Control (SCC) and all of a sudden, our vehicle immediately slowed down as if I had applied the brakes.

One instance was on a freeway with no surrounding traffic, the other was on a long local street with no surrounding traffic; freeway speed was 65 - 79mph, the local street was 35mph (I know it may sound strange using the SCC at that speed, but it was a long stretch and a known speed trap area).

Both roads were in good shape with no obstructions in the roadway.

Our main concern is that if the vehicle immediately slows down without the brakes being applied (and brake lights), we could potentially get rear-ended.

I researched and it appears that it could be related to the Navigation - Smart Cruise Control - Highway Auto Speed option, but just curious if anyone else has experienced this type of issue and were able to get an explanation on why it happened?
Same happens to me intermittently on my GV80 Advance plus. The Genesis service had it for a week and couldn’t duplicate the problem. So they didn’t do anything. Very dangerous. We could be rear-ended. What do we do. Who can we write to about this. My wife is afraid as a passenger in my GV80 and so am I. VERY UNSAFE!!!
 

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I had the same thing occur with me last weekend on the highway ; I was using Highway Driving Assist and Cruise Control at the time; I think it was in an area of poor satellite coverage and I suspect that it had to do with the loss of satellite signal - but am not sure .
 

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Did any of you find a solution or was it just a normal response of the cruise control? I have had two instances of the car going into first gear and locking in first gear with no cruise control on and no GPS speed control on. One instance was when I was sitting at a red light. When the light turned green, I stepped on the accelerator and the car got stuck in first gear and would not upshift. I had to have GV80 crawl 5 mph with the engine roaring to get off the road out of the way of cars behind me. After I turned off the ignition and turned the car on again, the problem disappeared. That was several months ago. Just this past weekend, my wife was driving about 30 mph and suddenly the car slow down quickly into first gear, stayed stuck in first gear, and I had to instruct her where to find a safe place to get off the road and park the car. We turned off the ignition. Turned the ignition back on, and the car resumed to normal driving. The first time this happened I brought the car into the dealer. He said he found no fault codes and could not replicate the behavior. I asked my dealer today if he has any information about such incidents. He said no. He said he thought it might be an accidental brushing up against the paddle shifter. We’ve been driving this car all year, are totally familiar with it, never use the paddle shifters, and they are not in a spot where we ever put our hands or fingers. Did any of you find a solution to your problem? Was it simply explained by having programmed your cruise control to link to GPS speed? Or was it something else? thank you for any feedback.
 

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Did any of you find a solution or was it just a normal response of the cruise control? I have had two instances of the car going into first gear and locking in first gear with no cruise control on and no GPS speed control on. One instance was when I was sitting at a red light. When the light turned green, I stepped on the accelerator and the car got stuck in first gear and would not upshift. I had to have GV80 crawl 5 mph with the engine roaring to get off the road out of the way of cars behind me. After I turned off the ignition and turned the car on again, the problem disappeared. That was several months ago. Just this past weekend, my wife was driving about 30 mph and suddenly the car slow down quickly into first gear, stayed stuck in first gear, and I had to instruct her where to find a safe place to get off the road and park the car. We turned off the ignition. Turned the ignition back on, and the car resumed to normal driving. The first time this happened I brought the car into the dealer. He said he found no fault codes and could not replicate the behavior. I asked my dealer today if he has any information about such incidents. He said no. He said he thought it might be an accidental brushing up against the paddle shifter. We’ve been driving this car all year, are totally familiar with it, never use the paddle shifters, and they are not in a spot where we ever put our hands or fingers. Did any of you find a solution to your problem? Was it simply explained by having programmed your cruise control to link to GPS speed? Or was it something else? thank you for any feedback.
The one time it happened to us it was because we were at an exit ramp on the highway with speed limit cruise on. We drifted too far into the exit lane and it picked up the 45 mpg limit for the ramp as we were steering it back into the center of the highway lane. This happened with lane centering on and the right side lane marker moved from the right of the right lane to the right of the exit lane so it tried to center between the two lanes picking up the slower speed limit sign.

What trim is your model? Just for reference.
 

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Sounds like some type of problem with programming for the paddle shifters if it does it again try hitting the up shift on it and see if it gets you out of first gear
Thanks for your reply and a good option to try if it happens again. I was kind of freaking out at both times (several months apart) and didn’t have the composure to think of that. If it happens again I’ll let you know what happens.
 

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The one time it happened to us it was because we were at an exit ramp on the highway with speed limit cruise on. We drifted too far into the exit lane and it picked up the 45 mpg limit for the ramp as we were steering it back into the center of the highway lane. This happened with lane centering on and the right side lane marker moved from the right of the right lane to the right of the exit lane so it tried to center between the two lanes picking up the slower speed limit sign.

What trim is your model? Just for reference.
Thanks for your reply. Interesting description of your road configuration situation at the time. It’s good to know what we should prepare for in terms of special circumstances. It makes sense. Mine is the 3.5 Prestige model.
 

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Our GV80 has done this when vehicles in front of us turn off road completely (with clear lane ahead) but turned vehicle stopped or was slow in moving away from main road. Had another incident where it thought a tree on side of road was a vehicle too and hit brakes hard. Agree very unsafe and too sensitive / too wide a camera view point.
 

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We've had two instances where we were driving with the Smart Cruise Control (SCC) and all of a sudden, our vehicle immediately slowed down as if I had applied the brakes.

One instance was on a freeway with no surrounding traffic, the other was on a long local street with no surrounding traffic; freeway speed was 65 - 79mph, the local street was 35mph (I know it may sound strange using the SCC at that speed, but it was a long stretch and a known speed trap area).

Both roads were in good shape with no obstructions in the roadway.

Our main concern is that if the vehicle immediately slows down without the brakes being applied (and brake lights), we could potentially get rear-ended.

I researched and it appears that it could be related to the Navigation - Smart Cruise Control - Highway Auto Speed option, but just curious if anyone else has experienced this type of issue and were able to get an explanation on why it happened?
Happened to me yesterday :( nothing around me… cruising along at 78 all the sudden the car starts slowing down … I was forced to get off the highway as it slowed for safety …
 

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Happened to me yesterday :( nothing around me… cruising along at 78 all the sudden the car starts slowing down … I was forced to get off the highway as it slowed for safety …
Were you at a highway exit when that happened? It happened to me that the cruise read the exit speed limit sign because the lane keeping started to drift towards the exit since the right side lane marker had moved over to the exit lane. We noticed in the cruise set speed that it had changed to the exit speed when looking at the dash. If it happens again check the set speed to see what it says as it will change to the current speed limit and if you get too far over towards an exit it will pick up those speed limit signs.

You guys do know that at any time you can speed up the car by using the gas pedal, right? Once you put your foot on the gas pedal it will allow you to take over driving. Just speed up until it picks up the next speed limit sign then you can go back to cruise. Or you can turn off cruise until you are ready to turn it back on, you don't have to exit a roadway, you are still in control of the car ultimately.
 

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Has anyone received an answer from Genesis dealer service department or corporate on what the cause of these occurrences is? My smart cruise control has been working flawlessly and is very impressive. I’d go so far as to say, amazing. However if there is a glitch where this can occur, and even recur repeatedly as reported above, then it needs to be addressed. I know it’s frustrating and not helpful when service says “Cannot duplicate the problem” and you’re left where you started. Based on the aforementioned experiences, Genesis should be looking at it and addressing it, especially since several members were able to duplicate the problem under consistent environmental conditions. (Was anybody able to take the dealer service manager along for a ride in their car to the exact highway location or other environmental condition, and show them what actually happens at the same spot?) Since this thread started three months ago, I’m just wondering if anybody had received a fix, information, or even acknowledgement about the issue from a Genesis authority, but has not updated their experience on this thread.
 

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Were you at a highway exit when that happened? It happened to me that the cruise read the exit speed limit sign because the lane keeping started to drift towards the exit since the right side lane marker had moved over to the exit lane. We noticed in the cruise set speed that it had changed to the exit speed when looking at the dash. If it happens again check the set speed to see what it says as it will change to the current speed limit and if you get too far over towards an exit it will pick up those speed limit signs.

You guys do know that at any time you can speed up the car by using the gas pedal, right? Once you put your foot on the gas pedal it will allow you to take over driving. Just speed up until it picks up the next speed limit sign then you can go back to cruise. Or you can turn off cruise until you are ready to turn it back on, you don't have to exit a roadway, you are still in control of the car ultimately.
It was not an an exit. I was in the left lane of an empty highway. It slowed down so rapidly to me it was a sudden mechanical issue. So "using the gas pedal" to speed up the car... was not something that came to mind. Hummmm my car is malfunctioning.. let me hit the gas! NOT.....
 

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It was not an an exit. I was in the left lane of an empty highway. It slowed down so rapidly to me it was a sudden mechanical issue. So "using the gas pedal" to speed up the car... was not something that came to mind. Hummmm my car is malfunctioning.. let me hit the gas! NOT.....
I wouldn't' suggest "Hitting the gas" as something to do. But either the brake or the gas would have turned off cruise at that time and given you back control of the car.

Was there a bend in the roadway that it might have seen a guardrail or guardrail reflectors? Just trying to figure out what might have caused the slow down.

This new adaptive cruise is new to most of us. We are use to the cruise keeping one speed until we either hit the brake to turn it off to slow down or hit the gas to go faster. With adaptive cruise it will slow down for you if something is perceived to be in front and will speed up at the next higher posted speed limit sign. So it's something new to get use to. Having it take over for what seems like no reason to us can be unnerving. But the car did perceive some reason for the slow down we just aren't seeing it at the same time. It's possible that an old construction speed limit sign that had been removed might still be in the system, or any number of other reasons. But keep in mind if it happens again that you can turn off cruise and take control of the car by just tapping the brake to see if it's a cruise thing or if the car is in fact having a melt down.
 
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