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Discussion Starter · #1 · (Edited)
I have a 2021 Chevy Trailblazer LS. Bought it brand new 6 weeks ago, now has 2496 miles on it. I have an appointment with my local Chevy service center on July 1st but wondered if anyone else has had this problem & what the outcome was.

There is a loud knocking sound under the hood after I turn the vehicle off. It usually takes a minute or 2 to start and goes on for 30 seconds to a min. Just started doing this 3 days ago but doesn't do it every time. It mostly happens at night for some reason. I have a video of the sounds it makes but not sure how to upload here. Also, last night I was driving home and the power steering alert came on. But just went out now and started the vehicle and the power steering warning isn't there anymore.

Should I run it into the service center today or would it be ok to wait for the scheduled appointment next week? I do have another road trip next M-W so I'm concerned something may happen while I'm out of town.


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2021Trailblazer RS AWD Scarlet Red Metallic
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The knocking sound isn't normal. Our Trailblazer makes some clicking sounds for a minute or two after you turn it off. I believe this is the brake system running a calibration as you can actually see the brake pedal move up and down a little bit. Most of us who have had the "service power steering" message just needed a software update, but there have been a few who had their steering column replaced. I would still take it in just to make sure you get the update and have the knocking sound looked at.
 
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Discussion Starter · #3 ·
The knocking sound isn't normal. Our Trailblazer makes some clicking sounds for a minute or two after you turn it off. I believe this is the brake system running a calibration as you can actually see the brake pedal move up and down a little bit. Most of us who have had the "service power steering" message just needed a software update, but there have been a few who had their steering column replaced. I would still take it in just to make sure you get the update and have the knocking sound looked at.
Thanks! I just dropped it off and they are going to try to fit it in today.
 

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2021Trailblazer RS AWD Scarlet Red Metallic
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If they do find any real issues, post the info here in case someone else has a similar problem.
 
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Discussion Starter · #5 ·
They said the knocking noises were normal, that the 2021 Trailblazers making a lot of weird noises & not to be worried about it. The power steering alert was a glitch & they still don't have a fix for it. I also mentioned the recall on the jacks & they don't have the new jacks yet. They said that once they get them in they will contact me & also check and see if there is a fix for the power steering glitch yet.
 

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2021 TB Zues Bronze Activ
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I am at 15k miles on my ACTIV and I have NO knocking noises. Should sound like any most other car.
 
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