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Discussion Starter #1 (Edited)
Hello Terrain Friends,

My wife and I bought a brand new 2018 GMC Terrain SLT with 6mi on the odometer. We have had the following issues with the vehicle...

  • OnStar Module "Inactive" whenever the tactile OnStar button was pressed --Fixed. (4 weeks later, req. a call to GM Corporate but Onstar finally fixed it.)
  • Driver-side rear passenger window moulding was unclipped, fell behind window. --Fixed at the dealer under warranty.
  • Driver-side window molding was scratched-up. --Fixed at dealer under warranty.
  • Rear passenger side quarter panel popped out from body of vehicle. --Fixed at dealer under warranty.
  • Passenger side door handle bracket (next to pull-out handle) came loose. --Fixed at dealer under warranty.
  • Tapping noise coming from passenger side of vehicle (door?) --Ongoing issue... 2 trips to the dealer, going on my 3rd this week..
The dealership has been relatively good at getting issues fixed/resolved; however, each repair usually requires a return trip; one for the inspection and part order, the second (once a third) to install the part.

The ongoing issue right now is a "morse code" type of noise coming from the passenger side of the vehicle. I have taken it to the dealer twice now and on the last trip (#2), I went on a ride with the mechanic. The mechanic said it may be the weather stripping so he applied some sort of grease to the weather stripping to quiet the noise.

The issue usually happens when the vehicle has been outside in the sun on a warm day. Once I drive the vehicle and reach around 25+ mph, the "morse code" starts and it's startlingly loud.

I have uploaded a short clip demonstrating the problem. URL: https://www.icloud.com/sharedalbum/#B0v5Uzl7VTPDRP

The noise comes from the passenger door and/or the center pillar. We have tried rolling the window up/down, open/close door, touching/pressing spots along the molding, and have found nothing to any effect. The only modification to that side of the car was a warranty repair on the passenger door handle.

My question is has anyone else had this issue, and if so, how did you get it resolved?

Last week, I contacted GM Corporate regarding the ongoing repair issues we have had--thankfully, nothing mechanical but with one exception all are cosmetic. To their credit, so far GM has been very responsive to issues with the vehicle, and is going to touch-base with the dealership when I bring it in this week.

Despite all these issues, we love the vehicle, and the gas mileage we are getting. It runs well, and has plenty of power for the freeways here in Los Angeles. I would appreciate any suggestions, advice, or input anyone can provide.

PS: Three (3) other [relatively minor] issues I've seen...
1. CarPlay can sometimes glitch, stop working, and will go black.
2. Reverse camera trajectory ladder will disappear if I decide to put the car in reverse too soon after I start the car. If I wait a minute or two after the car starts, the ladder will work fine; otherwise, the camera will stutter and the ladder will disappear.
3. Occasional "pop" noise from the speakers when using iPhone via USB on stereo with CarPlay. --Doesn't do it with my wife's iPhone 6 Plus but occasionally with my iPhone 7 Plus. Both are on iOS 12.0.1.

PS: I attempted to post this earlier but it disappeared. My apologies if this is posted in duplicate.
 

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Sounds like you may have gotten a lemon. I don't recall anyone with an '18 with anywhere near the number of issues that you have. Granted they are small, but still annoying.


You have a lot of patience.
 

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We’re had ours since June and other than a radio issue it’s been trouble free.
 
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Discussion Starter #4
Thanks for the heads up. I’m still in the process of dealing with this and currently have a loaner while the dealer figures it out. GMC is also involved and will be contacting me next week.


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Discussion Starter #5
Picked it up this morning. Went on long test ride with mechanic, was told a loose wire that runs from the noise cancellation speaker down the pillar was to blame. Will give it a few days but hopefully that was it.

My loaner for a few days was a 2019 SLE Terrain. I didn’t sense any differences between them outside of amenities.


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Discussion Starter #6
To my chagrin, it’s going back a fourth (4) time for this issue. We are beginning to look at Lemon Law for this vehicle.

Has anyone expertise in dealing with GM and/or a GM dealer in this sort of issue? We are in California.


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Was there any resolution to the "mores code"? I just got a 2019 53 miles on the odometer and when the car hit 1k miles my drivers side window started tapping! Right in my ear and I can't seem to pinpoint it! You are correct that it's worse or starts when the car is warm or in the sun. The hotter the outside temp the louder the tap! It goes in next week to have it checked but would be great to give them some ideas. At first I thought it was the headliner above the door, the maybe the molding above the door... I can't seem to pinpoint it but I know if I push on the headliner it stops then starts up again! Im going nuts! Any suggestions???
 

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I had an annoying rattle in a new Honda once and the dealer refused to do anything about it even though the car was just one month old. Dealer told me to turn the radio up so I wouldn't hear it. I damaged clips and the door panel taking it apart to pinpoint the rattle on my own but eventually found it and fixed it. The rattle was also temperature dependent. It turned out to be a metal rod that was hitting against the steel door inner and I bent the rod away from the panel to fix it.
 

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Discussion Starter #9
Was there any resolution to the "mores code"? I just got a 2019 53 miles on the odometer and when the car hit 1k miles my drivers side window started tapping! Right in my ear and I can't seem to pinpoint it! You are correct that it's worse or starts when the car is warm or in the sun. The hotter the outside temp the louder the tap! It goes in next week to have it checked but would be great to give them some ideas. At first I thought it was the headliner above the door, the maybe the molding above the door... I can't seem to pinpoint it but I know if I push on the headliner it stops then starts up again! Im going nuts! Any suggestions
Hello friend.

I wish I could give you good news but the issue was never resolved, we replaced the vehicle under lemon law with another brand (not GM) and have not looked back.

In addition to the rattle, we had multiple warranty issues that involved getting our vehicle bought back by the company under lemon law. The dealership did little to nothing to resolve our issues and the company dragged its feet until we enlisted an attorney.

I wish you the very best of luck and hope the issue gets resolved quickly for you.
 
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