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Discussion Starter · #1 · (Edited)
I thought I had this issue resolved a few months ago, but I find it still happening periodically. I will be making an appointment to have it checked out soon but wondering if anyone else has experienced this. Vehicle leaps forward (or reverse), on start-up when I put it in gear and remove my foot from the brake, as if it was revving too high, but I’ve seen it happen at 1 grand which I believe to be a normal idol. I have also noticed that at times after it’s been through its warm-up ritual the tach will still sit slightly over 1 grand and at times it will have no affect and others it will. If I am in a tight parking spot this “leap” could cause me to hit a car in front of me, or worse a pedestrian. At first I thought it was because I was putting it into gear while it was still going through its start-up ritual. Turns out that is not the case, I have intentional put it into gear while it was in this phase and the vehicle went into gear normally, I’ve been monitoring this very closely the last couple of months and cannot determine a pattern, it seems to happen randomly. It will happen even after a minute or two warm up. It happens very infrequently, maybe 1 in 40 or so starts. The leap is not very aggressive, but enough to get your attention. I have a feeling this will be one of those cases where the dealer cannot duplicate the issue and tells me that everything seems to be working fine.
 

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2021Trailblazer RS AWD Scarlet Red Metallic
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I agree with everything you said including the random 1 in 40 start ups. I also can't determine any pattern to when it happens. My guess would be a communication error or delay when you put it in drive or reverse. Good luck if you try getting the dealership involved because as you pointed out "cannot duplicate the issue" is the most likely scenario, but if by chance they do find something please share because even though it doesn't happen very often it does make you go whoa there, lol.
 

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Discussion Starter · #3 ·
I agree with everything you said including the random 1 in 40 start ups. I also can't determine any pattern to when it happens. My guess would be a communication error or delay when you put it in drive or reverse. Good luck if you try getting the dealership involved because as you pointed out "cannot duplicate the issue" is the most likely scenario, but if by chance they do find something please share because even though it doesn't happen very often it does make you go whoa there, lol.
Nice to know this issue isn't isolated to my vehicle, curious to find out if anyone else here has experienced it. I'm hoping the dealer may have seen others come in for this problem and determined a fix, I know I'm being overly optimistic. Maybe as more of these SUV's get out into circulation someone will figure it out. I guess these are the bugs that come along when purchasing a vehicle fist year out.
 

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2021Trailblazer RS AWD Scarlet Red Metallic
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2021 Chevy Trailblazer RS AWD
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Early on after getting the Trailblazer I experienced what you might be describing. The pattern I detected was that if I hold the brake pedal to start the vehicle and continue to hold the brake pedal before placing the gearbox in drive, I would get the lunge forward as described. It has been remedied by altering my start-up procedure. Brake pedal depressed to start, release brake pedal during warmup then pressing brake pedal again to engage drive.

My suspicion is that since the brakes are electrical assist, the system goes through an initialization process in those first few seconds after engine start. Holding the pedal mucks up the works. Suspicion and speculation only. No facts to back it up.

1.3 l, 9 speed auto AWD
 

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2021 TB Zues Bronze Activ
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Have had the ACTIV model a year now. How not seen this issue at all. 15k miles.
 

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2021Trailblazer RS AWD Scarlet Red Metallic
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"Leaping" might not be the best word to describe the issue. Our Trailblazer doesn't "leap", it's more like jolt sometimes when you put in in reverse or drive. It only seems to happen after a cold start and doesn't happen after it's been warmed up. Sometimes I feel like it has something to do with the parking brake, like it hasn't fully released even after pushing the button.
 
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