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Today we had Sunshine out for a nice top down ride. When I tried to close her back up the top closed, latched, then released the latching mechanism. “Top not secure” warning as it was definitely not locked down at the windshield.
When I got home I started trouble shooting by first disconnecting the battery and I decided to go ahead and disconnect my Smart top module. Reconnect battery and same issue still happening, closes normally, latches, then you hear the latching mechanism again and it releases. Guess I’ll be calling the dealer Tuesday since tomorrow’s a holiday.
Just wondering if any other HTC owners have had this issue.
There was someone else having a problem with his top. His problem was the wiring\cable that was routed up the side.
You might try opening the rear hatch in Service-Mode and inspecting the wiring.
Good luck.
No problems after several dozen up/down cycles over the last 6 months.
Press down on button and hold until DIC displays "Top Secure Motion Complete".
Pull switch up to raise close HTC top, and hold until "Top Secure Motion Complete" message in DIC.
There are several fuses listed in the (2024) OM, which seem to be HTC related.
You might want to check those before you call for service. Might be a simple fuse fix?
Also, maybe the issue is window open/close related.
Maybe try calibrating them per the OM procedure?
2024 SR HTC Z51 for reference.
No problems after several dozen up/down cycles over the last 6 months.
Press down on button and hold until DIC displays "Top Secure Motion Complete".
Pull switch up to raise close HTC top, and hold until "Top Secure Motion Complete" message in DIC.
There are several fuses listed in the (2024) OM, which seem to be HTC related.
You might want to check those before you call for service. Might be a simple fuse fix?
Also, maybe the issue is window open/close related.
Maybe try calibrating them per the OM procedure?
2024 SR HTC Z51 for reference.
Funny you mention the windows. They will not recalibrate after disconnecting the battery so I am thinking it is a sensor for the windows causing the problem.
I had a similar issue. Left side would latch down but the right side would not catch. Talked to 2 dealers and got gee Don’t know. I looked at the gear mechanism in the back and it was clear the frame had moved from the original install on the right side. I loosened the bolts and realigned the frame work. It worked better but I had to adjust the pin on the right side the one that goes into the windshield to guide the locks. its coated with rubber and I could see where it was wearing on one side. Once I did that all was well. Honestly both adjustments took maybe 15 minutes.
good thing with making these adjustments is you can stop and start the operation to assure nothing is way out of line. I just don’t like a dude at the dealership who had no experience messing with the car. I too had no experience but had more of a vested interest!
one thing you can do is as you lower the top, little by little is to gently giggle the top to see if it latches. If it does then it’s an an
alignment issue.
I had a similar issue. Left side would latch down but the right side would not catch. Talked to 2 dealers and got gee Don’t know. I looked at the gear mechanism in the back and it was clear the frame had moved from the original install on the right side. I loosened the bolts and realigned the frame work. It worked better but I had to adjust the pin on the right side the one that goes into the windshield to guide the locks. its coated with rubber and I could see where it was wearing on one side. Once I did that all was well. Honestly both adjustments took maybe 15 minutes.
good thing with making these adjustments is you can stop and start the operation to assure nothing is way out of line. I just don’t like a dude at the dealership who had no experience messing with the car. I too had no experience but had more of a vested interest!
one thing you can do is as you lower the top, little by little is to gently giggle the top to see if it latches. If it does then it’s an an
alignment issue.
Issue I’m having is that it does latch completely down then the mechanism makes the latching sound and it unlatches. You can hear and see it latch then unlatch in the video.
I had a similar issue. Left side would latch down but the right side would not catch. Talked to 2 dealers and got gee Don’t know. I looked at the gear mechanism in the back and it was clear the frame had moved from the original install on the right side. I loosened the bolts and realigned the frame work. It worked better but I had to adjust the pin on the right side the one that goes into the windshield to guide the locks. its coated with rubber and I could see where it was wearing on one side. Once I did that all was well. Honestly both adjustments took maybe 15 minutes.
good thing with making these adjustments is you can stop and start the operation to assure nothing is way out of line. I just don’t like a dude at the dealership who had no experience messing with the car. I too had no experience but had more of a vested interest!
one thing you can do is as you lower the top, little by little is to gently giggle the top to see if it latches. If it does then it’s an an
alignment issue.
Fear of this is exactly why I don't put my top up or down while driving at all. I'm terrified of not noticing some jarring bump and bending something.
I had a similar problem. My issue was a failed sensor at the location on the right side where the top latches just about the windshield.
Others have had an alignment issue with the same sensor.
Shot in the dark. Maybe something got into the latch opening in the windshield causing the sensor to think it’s an obstruction so it reverses the latch 🤷🏻♂️
Over the last couple of months I have had to reset the ECU with a battery disconnect from the dreaded Service Convertible Top message? Today leaving work it would not open with that message. after a 10 minute drive home it worked but then had a Top Not Secure message? After opening and closing a couple of times it went away? Starting to get worried because I only have about 10k miles left on the warranty! Dealer is over an hour away and right now would require a couple of vacation days to get addressed? 2021 HTC Z51
I had the same problem on my HTC. There is a GM service bulletin that the local dealership found that addressed the problem.
"21-NA-192: Convertible Top May Not Lower Intermittently"
Unfortunately, that same dealership (Southern Pines Chevrolet, NC) managed to crack the rear bumper on my C8 by hitting it with another car after pulling it into the garage to wait for an open bay. They are going to fix it but suffice to say I will not recommend them to anyone for service.
Do a search for the post where someone has a similar problem and found that you have to index the rear window too, and it’s not in the manual. Someone far better with search can probably link you the post. I printed and keep it in my glovebox in case it happens to me. Good luck.
Just had the same error pop up today, except it’s when I put my top down - when the back deck lid comes back down, it doesn’t get sucked down/locked into place. Go figure the weather is finally getting nicer now too lol…
I have to bring it to the dealer for some other maintenance but it’s just another thing that’s gone wrong with my car… still love it, but I’m TERRIFIED to own this outside of warranty. Already $12k+ in repairs (none transmission related) and have a lemon law case in progress.
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Top not secure
